Depositional Environments of the Upper Permian Quartzose
Transcription
Depositional Environments of the Upper Permian Quartzose
Journal of Earth Science, Vol. 26, No. 2, p. 273–284, April 2015 Printed in China DOI: 10.1007/s12583-015-0530-2 ISSN 1674-487X Depositional Environments of the Upper Permian Quartzose Sandstone (Shandong Province, North China): Insight from Trace Element Geochemistry Dawei Lü*1, Zengxue Li1, Jitao Chen2, Ying Liu1, Zengqi Zhang3, Jipo Liang3, Haiyan Liu1 1. Key Laboratory of Depositional Mineralization & Sedimentary Mineral (SDUST), Shandong Province, Qingdao 266590, China 2. Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 3. Geological Institute of Shandong Province, Jinan 250013, China ABSTRACT: The depositional environment of the Upper Permian quartzose sandstone (Kuishan sandstone in Shihezi Formation of Upper Permian) in the North China epicontinental basin is controversial. In order to test the previous hypotheses, we analyzed sedimentological characteristics of the Kuishan sandstones in outcrops and boreholes, and carried out trace element geochemical analysis by electron probe microanalyzer. Three lithofacies were recognized, including normal-graded conglomerate (Cng), trough and planar cross-bedded coarse sandstone (CStpc), and planar cross-bedded medium sandstone (MSpc). Normal-graded conglomerate (Cng) formed in the meandering river or deltaic distributary channels. Trough and planar cross-bedded coarse sandstone (CStpc) formed in meandering river or distributary channels of near-source deltaic plain. Planar cross-bedded medium sandstone (MSpc) formed in the siliciclastic beach with high- to moderate-energy conditions. By the petrology and trace elements analysis, three relatively large-scale transgressions were revealed. Each transgression was reflected by the lower content of Ba and ratios of Fe/Mn, and the high content of B and ratios of B/Ga. The ratios of Ni/Co of all samples are all lower than 2, suggesting oxygen-enriched shallower water environment during deposition of the Kuishan sandstones. KEY WORDS: Kuishan sandstone, electron probe microanalysis (EPMA), depositional environment, transgression, regression. 0 INTRODUCTION Quartzose sandstones may deposit either in high-energy beach (Swezey et al., 1996; Mazzullo et al., 1991; Dabbagh and Rogers, 1983), or in fluvial or deltaic settings (Dixon et al., 2012; Nichols, 2009; Maill, 1996). However, depositional environments of some laterally traceable, thick successions of sandstones are hardly soundly interpreted based only on sedimentary facies analysis because there are not many variations in terms of lithology, grain size, texture, and sedimentary structures. The Upper Shihezi Formation (Middle–Late Permian) in Shandong Province, North China contains a thick succession of sandstones (Kuishan sandstone), which is generally believed to be deposited in fluvial environments based on the wide distribution of sandstone bodies (channel deposits) (Liu et al., 2008; Han et al., 2007; Wang F H et al., 2007; Zhang et al., 2007; Wang M Z et al., 2004; Fu et al., 2002; Huang W H, 1998; Late Permian. However, whether or not the Kuishan sandstones *Corresponding author: [email protected] © China University of Geosciences and Springer-Verlag Berlin Heidelberg 2015 Manuscript received September 18, 2014. Manuscript accepted March 1, 2015. Zhang and Liu, 1996; Li, 1987; Huang and Peng, 1981; Pan, 1957). Recently, the fluvial depositional environments of the Kuishan sandstones of the Upper Shihezi Formation were questioned, which is argued as followed: (1) The Kuishan sandstone distributes widely in the Shandong region and the Bohai Bay Basin, as well as in Shanxi and Hebei regions (Cheng, 2011; Zhang et al., 2007). The extensive distribution of the sandstones cannot be formed by continental deposition. (2) The Kuishan sandstones are mainly composed of tight medium sandstone (Zhang and Liu, 1996) and the vertical cyclicity is not as obvious as the meandering river channel sandstones (Desjrdins and Pratt, 2010; Dabbagh and Rogers, 1983). On the other hand, evidence of transgression has been discovered in the Upper Shihezi Formation in North China. (1) Large amount of Lingula fossil was found in the bottom and top of the Upper Shihezi Formation in the west Weishan Lake in Tengxian sag (Fig. 1), which was regarded as the record of the transgression in the period of the Upper Shihezi Formation (Wang, 1983; 1978). (2) Marine fossil fragments (e.g., Lingula sp. which belongs to Inarticulata of Brachipoda) and glauconites were also discovered in siliceous rocks in the Upper Shihezi Formation in the West Ordos Basin (western part of the North China Platform) (Zhang and Liu, 1996; Wang Z Q, 1989; Wang R N, 1982a, b), which is strong evidence of transgression in the Lü, D. W., Li, Z. X., Chen, J. T., et al., 2015. Depositional Environments of the Upper Permian Quartzose Sandstone (Shandong Province, North China): Insight from Trace Element Geochemistry. Journal of Earth Science, 26(2): 273–284. doi:10.1007/s12583-015-0530-2 274 Dawei Lü, Zengxue Li, Jitao Chen, Ying Liu, Zengqi Zhang, Jipo Liang and Haiyan Liu were formed or influenced by transgression is unknown. In this paper, we present both sedimentological and trace-element geochemical data to reveal the depositional environments of the Kuishan sandstones. 1 GEOLOGICAL SETTING Western Shandong area, which locates at the middle-west of Shandong Province of East China, is separated by Tanlu fault to the east, Hantai fault to the south, Liaokao fault to the west and Bohai Bay Basin to the north (Fig. 1). The coal basin covers an area of about 90 000 km2 (320 km in N-S direction and 280 km in E-W direction). Due to the late tectonic movements of Yanshan and Himalayan periods, the coal-bearing basin was cut into present tectonic structures. The main Late Paleozoic strata consist of Benxi, Taiyuan, Shanxi, Lower Shihezi, Upper Shihezi, and Shiqianfeng formations in ascending order. Benxi and Taiyuan formations, which are made up of sandstone, mudstone, limestone and coal beds, were formed in the epicontinental sea environment (Lü and Chen, 2014; Lu et al., 2012a, b; Shao et al., 1999). Shanxi Formation, composed mainly of gray-white, medium to coarse sandstone, gray-black mudstone and coal beds, was formed in a delta environment (Lü and Chen, 2014; Lu et al., 2012a, b). Lower Shihezi Formation mainly consists of yellow-green sandstone, red mudstone, and discontinuous coal beds, which is deposited in meandering river (Lu et al., 2012a, b; Lü et al., 2011). Upper Shihezi Formation can be divided into three members, including Wanshan, Kuishan, and Xiaofuhe members in ascending order (Zhang and Liu, 1996). The Wanshan member consists mainly of yellow-green, thick-bedded coarse arkose sandstone, fine sandstone, and mudstone, the Kuishan member is dominated by thick-bedded tight quartz sandstone, and the Xiaofuhe member is characterized by purple, yellowish-green, and dark gray mudstone, with intercalated conglomerate and sandstone. 2 MATERIALS AND METHODS The Zibo Section and boreholes in Heze and Huanghebei mining areas (Fig. 1) were studied in detail with respect to sedimentary structures, lithofacies, and depositional sequence. Samples for petrographical and geochemical analyses were collected from the drill core ZKM1 of Heze mining area (Figs. Figure 1. Geographic map of the Western Shandong area. NCB. North China Block; SCB. South China Block; TB. Tarim Block. Depositional Environments of the Upper Permian Quartzose Sandstone (Shandong Province, North China) 1 and 2), which represents the Kuishan member (Table 1). The key principles of sampling are: (1) collecting samples every one meter if the lithological characteristic and sedimentary structures have minor changes; (2) collecting all the samples if the lithological characteristic and sedimentary structures are changed significantly; and (3) collecting each sample every 2–3 275 m if the lithological characteristic and sedimentary structures have no change. EPMA (electron probe microanalysis) is an effective tool to study the trace elements (Hong et al., 2011). The results are modified by the ratio of X-rays intensity between test and standard samples. Many influence factors are mainly Figure 2. Stratigraphic columns of the Kuishan sandstones. Dawei Lü, Zengxue Li, Jitao Chen, Ying Liu, Zengqi Zhang, Jipo Liang and Haiyan Liu 276 Table 1 No. KS1 KS2 KS3 KS4 KS5 KS6 KS7 KS8 KS9 KS10 KS11 KS12 Depth (m) 629.61 630.41 632.00 633.00 634.00 635.00 636.00 637.00 638.00 639.00 640.00 641.00 Sampling list of the Kuishan sandstones Lithology Medium sandstone Medium sandstone Medium sandstone Medium sandstone Medium sandstone Coarse sandstone Medium sandstone Medium sandstone Medium sandstone Medium sandstone Medium sandstone Medium sandstone equipments stability, differences between test and standard samples, and so on. There is about 15% relative errors in the analysis of trace elements by EPMA follow the AS 02753-AB 53 minerals standard serial SP instructions and compositions (SPI). And the microanalysis degrees is 0.1%–0.01% (Li, 1992). The standard samples are as follows: BaB2O4(ZBA-28), GaAs(SPI-48), CaSO4(SPI-3), RbTiOPO4(ZBA-29), SrSO4(SPI-13), Cr2O3(SPI-17), Ca2(VO4)2(ZKW-5), NiO(ZBA-9), MnSiO3(SPI-39) and Fe3O4(SPI-26). Thin sections were prepared for petrographic analysis of marine authigenic minerals (e.g., glauconite) and interstitial material (Figs. 3, 4). Marine authigenic minerals and interstitial material were performed for electron probe microanalyzer (EPMA) to check trace element concentrations (e.g., B, Sr/Ba, Sr/Ga, V/Cr) (Gong et al., 2011; Moslow, 1988; Sun and Li, 1986). Minerals were analyzed with a JEOL JXA-8230 electron probe microanalyzer at Laboratory of Materials Science and Engineering in Shandong University of Science and Technology. The accelerating voltage was 15 kV with 15 nA beam current, 3 μm beam spot, and 10–30 s counting time. Thin sections were prepared for carbon plating in advance. No. KS13 KS14 KS15 KS16 KS17 KS18 KS19 KS20 KS21 KS22 KS23 Depth (m) 642.00 643.20 643.50 644.50 645.00 645.50 646.00 647.00 648.00 649.00 656.00 Lithology Medium sandstone Coarse sandstone Coarse sandstone Medium sandstone Coarse sandstone Coarse sandstone Medium sandstone Coarse sandstone Medium sandstone Coarse sandstone Medium sandstone fluvial settings (Maill, 2006) or near-source deltaic channels (Dixon et al., 2012; Nichols, 2009). 3.1.2 Trough and planar cross-bedded coarse sandstone (CStpc) Description: The sandstone bed locally contains quartzose clasts. Clasts are about 2–3 mm in diameter, gradually become smaller upward. Sandstone is well sorted and rounded, locally trough to planar cross-stratified, and is partly normal graded (Fig. 5d). Interpretation: This facies formed under high-energy conditions. Quartzose clasts are indicative of high composition maturity. Good sorting and roundness suggest that the clasts were transported for certain distances. Trough to planar cross-stratification formed in in fluvial settings (Miall, 2006) or near-source deltaic channels (Dixon et al., 2012; Nichols, 2009). 3 RESULTS 3.1 Sedimentological Characteristics Three lithofacies were identified by observation of the Zibo Section and Heze and Huanghebei mining borewells, including normal-graded conglomerate (Cng), trough and planar cross-bedded coarse sandstone (CStpc), and planar cross-bedded medium sandstone (MSpc) (Fig. 5 and Table 2). 3.1.3 Planar cross-bedded medium sandstone (MSpc) Description: The sandstone is composed mainly of quartz grains and siliceous cementation. Sandstone is massive (Fig. 5e) or low-angle planar cross-stratified (Fig. 5f). Cross-stratification is large-scale (Fig. 5e). Sand is well sorted and rounded. Sandstone bed is about 1–5 m thick. Interpretation: High composition and texture maturity, large-scale cross-stratification, and massive structures are collectively indicative of long-term reworking under high-energy conditions. The sandstone was most likely deposited in high-energy beach (Desjrdins and Pratt, 2010; Nichols, 2009). 3.1.1 Normal-graded conglomerate (Cng) Description: Thin-bedded conglomerate occurs in the lower part of the bed, overlying the medium sandstone with erosional boundary (Figs. 5a, 5b). This facies is locally absent. Clasts are composed mainly of quartz, about 2–5 mm in diameter. They are rounded and well sorted (Fig. 5c). The conglomerate bed is about 10–40 cm thick, commonly normal-graded (Fig. 5c), and locally trough to planar cross-stratified. Interpretation: The conglomerate was most likely deposited under high-energy conditions. Quartz clasts are indicative of high composition maturity. Good sorting and roundness indicate the clasts were transported for certain distances, mostly likely in 3.2 Trace Element Geochemistry 3.2.1 Interstitial materials Twenty samples were selected from Kuishan Section of the Upper Shihezi in ZKM1 Well to analyse clay minerals’ compositions of B, Ga, Ba, Mn, Fe, Ni and other sensitive elements. Test results are shown in Table 3. The EPMA data of interstitial materials (Fig. 3) are shown in Table 4. All of elements were found in the form of oxide. We found B, Ga, Co, V, Cr, Ni is in six samples (KS2, KS8, KS6, KS14, KS18 and KS20) (Table 4). We found the B content in six samples can reach more than 1 000 pm, and ratios of B/Ga are higher than 7. All samples’ ratios of Ni/Co is lower than 1 (Table 3 and Fig. 6). Depositional Environments of the Upper Permian Quartzose Sandstone (Shandong Province, North China) Table 2 277 Lithofacies description and interpretation Lithofacies Lithology Bounding surfaces Thickness Normalgraded conglomerate (Cng) Clast-supported, composedmainly of quartzgravels (2–5 mm), moderately sorted, sub-rounded Sharp base with medium sandstone, gradational top with coarse sandstone Individual beds 0.1–0.4 m Trough and planar cross-bedded coarse sandstone (CStpc) Clast-supported sandstones, with quartz gravels (2–3 mm), moderately sorted, sub-rounded. Gradational base with conglomerates, gradational top with medium sandstone Individual beds are 0.5–1.5 m Sedimentary structures Occasional bidirectional and graded-bedding imbrications; matrix composed of coarse sands with siliceous cement Trough and planarcross bedding; siliceous cement Planar cross-bedded medium sandstone (MSpc) Well sorted, sub-rounded; composed mainly of quartz (>95%), and a small portion of mica, feldspar, and clay minerals; siliceous cement Gradational base with coarse sandstone, sharp base top with conglomerates Individual beds are 1–5 m Low-angle tabular cross bedding; siliceous cement Table 3 Meandering river or distributary channels of near-source deltaic plain (Dixon et al., 2012; Nichols, 2009; Miall, 2006) Siliciclastic beach with highto moderateenergyconditions (Desjrdins and Pratt, 2010; Nichols, 2009) The microprobe results of clay minerals’ elements in Kuishan Section of the Upper Shihezi Formation in Heze area Depth (m) Lithology B2O3 KS1 629.61 Medium sandstone KS2 632 Medium sandstone No. Depositional process Meandering river or deltaic distributary channels (Dixon, et al., 2012; Nichols, 2009; Maill, 2006) Ga2O3 BaO K2O CoO Cr2O3 V2O3 ND 0.015 0.019 0.055 0.03 0.02 0.127 0.006 0.013 ND 0.009 ND 0.027 0.009 0.059 0.024 0.817 0.046 0.004 0.052 FeO MnO NiO KS3 633 Medium sandstone 1.223 0.012 0.062 8.284 0.004 0.066 0.035 1.091 0.003 0.012 KS4 634 Medium sandstone ND 0.001 0.034 6.725 0.024 0.072 0.025 8.401 0.051 0.016 KS5 636 Medium sandstone ND 0.004 ND 8.753 0.012 0.078 0.037 1.857 0.011 0.009 KS6 637 Medium sandstone ND 0.024 0.049 0.202 0.01 0.087 0.05 0.018 0.005 KS7 638 Medium sandstone ND 0.015 ND 0.022 ND 0.063 0.003 0.048 0.011 0.002 KS8 639 Medium sandstone 0.36 0.021 0.043 3.706 0.011 0.061 0.037 0.504 0.001 0.008 KS9 640 Medium sandstone 1.027 0.011 0.05 6.886 0.008 0.108 0.024 11.932 0.049 0.005 ND 0.044 0.005 7.822 0.011 0.028 0.016 2.309 0.021 ND ND 0.008 0.029 7.91 0.025 0.229 0.037 1.512 0.008 0.017 KS10 641 Medium sandstone KS11 642 Medium sandstone KS12 643.2 Coarse sandstone ND 0.007 0.006 6.639 0.038 KS13 643.5 Coarse sandstone ND 0.02 0.046 3.015 ND 0.08 ND 0.061 3.785 0.021 0.002 0.043 0.018 0.584 0.014 0.005 KS14 644.5 Medium sandstone 0.56 0.016 0.041 7.324 0.011 0.041 0.011 1.046 0.018 0.011 KS15 645 Coarse sandstone ND 0.005 0.039 5.65 0.007 0.051 0.051 0.672 0.007 0.007 KS16 646 Medium sandstone ND 0.007 0.041 6.163 0.009 0.134 0.014 0.891 0.014 0.002 KS17 647 Coarse sandstone ND 0.012 0.025 6.492 0.021 0.052 0.029 0.005 0.035 KS18 648 Medium sandstone KS19 649 Coarse sandstone ND 0.026 0.015 0.009 0.01 KS20 656 Medium sandstone 1.221 0.007 0.033 1.312 0.597 0.001 5 0.022 5 0.270 5 0.011 0.073 0.844 0.01 0.442 0.015 5 0.009 5 0.065 0.017 0.038 0.001 ND 0.048 0.164 0.056 28.311 0.102 0.013 Note. The measured data is wt.%, and some of the samples did not measure the B content, ND-not detected. 3.2.2 Discovery of glauconite Glauconite is found from Kuishan sandstones (Figs. 4 and 6). It occurs as a round pellet, egg-shaped strips and irregular granular. The glauconite grains are green, pale green and yellow-green under polarizing microscope with 0.05–2 mm in size. Representative samples are selected for EPMA (Fig. 4) and the results are shown in Table 5. The glauconite in Kuishan sandstones contains 3 wt.%–9 wt.% K2O, 14.62 wt.%–19.23 wt.% Al2O3 and 7.61 wt.%–13.71 wt.% FeO. Weaver and Pollard (1973) gave the average glauconite composition with Dawei Lü, Zengxue Li, Jitao Chen, Ying Liu, Zengqi Zhang, Jipo Liang and Haiyan Liu 278 Figure 3. Photomicrographs of interstitial material. (a), (b) samples from KS8; (c), (d) samples from KS14; (e), (f) are from KS20. (a), (c) and (e) under polarizing microscope; (b), (d) and (f) under electron probe corresponding to the (a), (c) and (e). Table 4 No. KS3 KS8 KS9 KS14 KS18 KS20 Quantitative analysis of trace element in interstitial material of ZKM1 by EPMA Lithology Medium sandstone Medium sandstone Medium sandstone Medium sandstone Medium sandstone Medium sandstone B 379.79 111.79 369.22 173.90 185.39 Ga 6.70 15.62 9.81 11.90 2.52 Result (ppm) Co V 7.08 16.31 8.65 25.15 29.02 9.01 8.65 7.48 8.65 6.80 379.17 5.21 37.75 38.07 Cr 40.37 41.74 14.01 28.05 49.95 Ni 3.13 6.28 5.82 8.64 7.46 Element ratios B/Ga V/Cr Ni/Co 56.73 0.40 0.44 7.16 0.60 0.73 37.62 0.64 0.20 14.61 0.27 1.00 71.27 0.14 0.86 112.21 10.22 72.81 0.34 0.27 Depositional Environments of the Upper Permian Quartzose Sandstone (Shandong Province, North China) 279 Figure 4. Photomicrographs of glauconite. (a), (b) samples from KS18; (c), (d) samples from KS20. (a) and (c) under polarizing microscope; (b) and (d) under electron probe corresponding to the (a) and (c). 6.884 wt.% K2O, 9.15 wt.% Al2O3 and 21.38 wt.% Fe2O3. Comparing to these results, the glauconite in the present study contains higher Al and lower Fe, Ca and Na. Some studies show that the ancient glauconite has higher K2O content and lower FeO+Fe2O3 content, and with the decreasing of the Al content, the Fe content of the glauconite is increasing (Chen Y H, 2008; Li et al., 2006; Mu, 1999; Haughton et al., 1991; Zhao and Zhang, 1988; Walker, 1982; Chen R J, 1980; Heezen et al., 1966). Those previous studies support the microprobe results in this paper and confirm the presence of glauconite in Kuishan sandstones. 4 DISCUSSION The Kuishan sandstones are characterized by the lower thin conglomerate bed, the middle medium- to thick-bedded coarse sandstone, and the upper medium sandstone, forming generally a fining-upward cycle (Figs. 5g, 5h). Based on sedimentological characteristics, conglomerate and coarse sandstone were most likely deposited under deltaic distributary channels or meandering rivers, whereas thick-bedded medium sandstone with low-angle cross-stratification is essentially different from point bar deposition in a meandering river (Miall, 1996). Therefore, medium sandstone was most likely not deposited in point bar, but deposited in high-energy beach. Consequently, conglomerate and coarse sandstone were most likely deposited under distributary channels on deltaic settings. So the Kuishan sand- stones are made up of beach facies associated with meandering river and distributary channel facies. Beach facies resulted from marine transgression, whereas meandering river and distributary channel formed during regression (Li et al., 1979). During relative sea-level rise, coastal sand body overlapped on the sand body deposited in meandering river or deltaic channel, which formed a generally fining-upward sandstone succession. During regression, the situation is reversed. With repeated transgression and regression, fluvial or deltaic sandstones are intercalated with coastal sandstones. Therefore, the transgression river channel filling sandstone is characterized by coarse sandstone gravels at bottom with large scale trough cross-bedding and upwards with fine-grained horizontal bedding and small cross-bedding. The sandstones were formed in two different settings, i.e., fluvial and coast near-shoreface. Geochemical and microscopic analyses on sandstone specimens were carried out in order to test this hypothesis. Generally, interstitial materials include the matrix and cement. (Wang F H et al., 2007; Liu and Zeng, 1985; Wang Y Y et al., 1979). The interstitial materials are composed of clay minerals, whose adsorption ions are rather stable without variation during the diagenesis, epigenesist and weathering processes. The adsorption ions types are related to the water composition and mineralization degree. For example, clay is rich in Ca, Mg in the fresh water while the Ca is replaced by Na and K in sea water (Weaver and Pollard, 1973). Thus the adsorbed 280 Dawei Lü, Zengxue Li, Jitao Chen, Ying Liu, Zengqi Zhang, Jipo Liang and Haiyan Liu Figure 5. Photographs and line drawing of the Kuishan sandstones. (a), (b) and (c) thin-bedded conglomerate (CN) and medium-bedded coarse sandstone (CSM); (d) thin-bedded conglomerate (CN) facies in borehole; (e) and (f) tabular cross-stratified medium-bedded medium sandstone (MSM); (g) and (h) lithofacies association and cycles in outcrop and borehole. Depositional Environments of the Upper Permian Quartzose Sandstone (Shandong Province, North China) 281 Figure 6. Influence of sea water indicated by the ratios of trace elements. Table 5 No. KS18 KS20 The element comparison of glauconite Lithology Medium sandstone Medium sandstone FeO include FeO+Fe2O3. Na2O 0.04 0.04 MgO 3.37 2.85 Al2O3 17.69 19.23 Results (wt.%) SiO2 K2O 53.04 8.50 53.78 8.40 CaO 0.23 0.18 TiO2 - MnO 0.01 0.02 FeO 11.41 8.87 282 Dawei Lü, Zengxue Li, Jitao Chen, Ying Liu, Zengqi Zhang, Jipo Liang and Haiyan Liu components of clay minerals can fully reflect the physical and chemical conditions of deposition which are thought to be an indicator of the depositional environment. Trace element in interstitial material provides information to indicate sedimentary environment. For example, B content of intersitital material in marine deposits is usually more than 100 ppm (Marine Geology of Tongji University, 1980). B content in the interstitial material of six samples (Table 4) ranges from 100 ppm to 400 ppm, which is more than 100 ppm. Wang et al. (1979) concluded that the B/Ga ratio of fresh water is less than 4, while the seawater deposition is more than 7 or 20. In present study, the B/Ga ratios of the six samples are greater than 7 (Table 4, Fig. 6), indicating that some layers of the Kuishan sandstones are effected by sea water. B content in other samples is too low to be detected, which shows that these sandstones formed in fluvial or lacustrine shoreface without the influence of sea water. Ni/Co ratio is also usually introduced to indicate the oxygen fugacity of depositional environments. Yan et al. (1998) proposed that the Ni/Co ratio in oxygen-rich environment is less than 5.0, whereas in oxygen-poor environment the ratio is 5.0–7.0. Ni/Co ratios of all samples are between 0 and 2 (Table 3, Fig. 6), which indicates that the Kuishan sandstones formed in an oxygen-rich environment, most likely fluvial environmentFurthermore, Fe/Mn ratio can be used to determine the variation of the water depth (Li et al., 2006). Fe/Mn ratios of the study area vary greatly and are negatively correlated with water depths (Fig. 6), indicating that the water depth changes quickly during deposition of the Kuishan sandstones. In addition, glauconite is also identified at the bottom of the Kuishan sandstone. The glauconite is a typical diagnostic mineral formed in the sea water with pH 7–8 at depth of about 30–2 000 m and water temperature in the range of 15–20 ºC, which often occurs in the marine affected delta region (Wu, 1992; He and Yu, 1982). Therefore, we can conclude that the Kuishan sandstones should have formed in the oxygen-rich, shallow-water environment influenced by sea water. Kuishan formation is made up of alternate transgressive and regressive sandstone layers, where the fluvial sediments layers occur in between. This sandstone was formed in the distributary river channel and near shore filling during the transgression and regression in the regions linking the sea and continent. Based on the analysis of petrology and trace elements, we can identify three relative large scale transgressions (Fig. 6). The first transgression can be found at the beginning of Kuishan sandstone sedimentation. It can be reflected by the KS18 and KS19 samples. The content of B is 1 853.94 ppm, with ratio of B/Ga is 71.27. The 2rd transgression can be reflected by the KS8 and KS9 samples. The 3rd transgression is the most quickly and spread widely. Every transgression can be reflected by trace elements (e.g., the lower content of Ba and ratios of Fe/Mn, and the higher content of B and ratios of B/Ga). The ratios of Ni/Co of all samples are all lower than 2, which reflect the oxygen-enriched shallower water environment during the whole deposition. 5 CONCLUSIONS Three lithofacies were recognized in the Kuishan sandstones including normal-graded conglomerate (Cng), trough and planar cross-bedded coarse sandstone (CStpc) and planar cross-bedded medium sandstone (MSpc). The medium sandstone was formed in high-energy clastic beach. Intensive samples taken from Kuishan sandstone of Heze mining area in western Shandong area were studied by microscope and electron probe microanalyzer (EPMA) means. Geochemical evidence (e.g., B, B/Ga, Ni/Co, Fe/Mn) and discovery of glauconite indicates the formation environment of Kuishan sandstone is rather complicated and is difficult to explain its genesis using a single-environment model (e.g., river or coast), and it should be impacted by frequent sea-level changes. By the petrology and trace elements analysis, depositional model of Kuishan sandstone was established and three relatively large-scale transgressions were found. The first transgression can be found at the beginning of Kuishan sandstone deposition. The second transgression can be reflected by the KS8 and KS9 samples. The third transgression is the most quickly and spread most widely. 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