rt!1f,3

q-4E\55"
283 C0 1
- 40,+ \
THE BROKEN HILL PROPRIETARY COMPANY LIMITED
GEOLOGICAL SECTIQN
MELBOURNE
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~S~R~tI.~~.~
Sf PP:LAND vL OR
-8~=M ~m:~=
Melbourne
283C03
MELBOURNE
OaJ,..
.......
Fi.... specillens 01' .arkese tl'oll Fingal 1'(0. 1 Bore,
'1'asllen1a. and sn-en 8Pe~ll1ens troll Wellington Park well,
Glppsland, ••1'(1 submitted tor petrologiCal. exaJIlinatlon d4
comparison.
'thin s.c·tions of! tiles. rocks and sOlle heavy aineral,
a8s.mblages have been examined. ' ~1ng tile course of this
work, p~bleDlS have been encountered concerning the possible
presence ot z.011te8 1n ver'l nne srainM ~terlal, and the
let.nU t1' ef a coloUl'leS8 .1ne~, believed to be al.bi t.
partl1' replacing felspar CryStal.8 in the Victorian spec·illens.
So far, none of the spec·iIIens has bean t01Dld to contain
But'1'lCleJ1U, large patches of th'8.III~terbls tOlllalte,
possl~le .separation anA Identification by optlcal end X-ra1'
in•••t1gatlon. As turther inT88t1~tion. into the possib1.
presenc, 01' zeo11tes and their significance will take considerable tll11e, it has been decided not to del., thls report
1'urthtr, but to issue a separate Qrle later Bhould U8et'ul
information emerge froll a 1I0re detal1ed stuiJ.
/
. . .. .' .
.
.
,
(
"
•
2 8 3 C0 £}
.
MEtBOURNE O!!'SE
!'A"
220 .
11.572
,II)"
262
no!!
2.8'
M.!$73·
)",574
, lJID"
JP1
.'l.$'?J' .
il~"
.668,
)1,.',76
a~ctll.n8 ' "A".
lie" $4, liE" .are .cOlllPoaed: pI'840.1nan~17"
ot. ~latiT.1y t'reeh·, unweat!!.ere4
anguial'
~ sllghUyrounded,
.
.
f'raam,ents .~ ....~ &0 grained volcanic roCksh01r1ng veat·
T81'1at~OD 1n tex~ (atcl'Gio"pol'pb)"t'ltlc. rt.. ..,Uuctu:r"
tl'tioh7t1c, ~xture* etc.). .eet, ot the•• ' tngm.t8app.a~ to /.
haT. bfltQ 481'1"'04 ~Il an an4eaUi@ type f f roCk_8Dd 1n'\b1e
l'esp.¢t . thv 81"8;e,y, .11611a~ 'to , th.~e pll,"e• •' ·k1.p.lt.1,aea~
. '
'
ot a,ltOIl.'tTo. vhtClr~.. .... .'.
,
;;
.'
':, ,'.
.
. ',.,
Oti1et dast!'o 4.tJOltus '!n~ludes te1spar grains;
,.
'(011--1' .
claso, 'albite., .rtheola.~, ran Ilhrocline) qUarts, flake. ot
b1otl~., ~.rU1C· t'ftpents,' shreds and hagtlen1;s ot carboni d
plant l'eaa!ns, and aiDor heaTY .ineZ'al g\"aiDa ma:ln1y apat! tel
epldow, and 111reoJh
Speolaen. liB" an4 liD" haTe a 81m11ar eomPoslt1an but the
deu-ltd 1'tapents show IIQN n14ence ot rounding and predep.s1 tlonal weatherbg, and m8D7 are obscured by br01m
.taulAg.
In pneral"the detrital valDs are ot zoelatiTe17 lD'11to1'm
slse in tho lillie sped.man4 are cUoBely paCkeel. No bedding
planes We" obeerv,4, 'but there 18 " 'endency f'orll1.88~e4
tl'apmte and bie ito flakes to l1e with their long direc·tton
appNXiaaie17 horlsQIltal.
HeavY minerals separated in 'btOllofol'Bl trOIIi speciJllen "B"
lDcludes
283005
MELBOURNE
3.
OF.F1qe
br~ b'10t$te "" COIIIlIta
~0'r:1'.
""'t.ffff tlfAl\:ee;, $911I8 eh1or1tic. trapOll1;a.
',ort'llUtao:t' sliUll!3t. Ol' altered terP",",
lIIasnefiian'.lIl~el'als.
Opaq~
'
.
Iron
'~4es
• •I
and 1.eue~xene.·,
""lJ9_Qil. prt_ ~i·C.$QllU~ e(jilll~l'QUll.I1.d.
fffff 41ouq' ~aU\$, l,T;t'o, t9 "04 br~.
"
p~eochh1e.;
.... aen.~11
,
angu1$l'
Mld
.
'
.
t~r;~~lr
p~in.;'
'-.'
.
.... ~1 p.r:tIJ1I4tAc; "~'ntatSi#, aOIlCi:d~".
i
t
,.~~1118~On~t n~ "4Wg~t,,:~e;es. '()nl, ; , :1
. r$:I1't l'o~~ed: gal." priibtl'b~1 tfttIIt· a ;
, ··4'$:t.ee~ent':$l)~i; or,'"
'.•,'jd. ;.. ·.~ar:·
,
. . ~ot .
'I I'"
"
.' .
. ' .'.."':;".
to' sem'l~r(l\.tD,de.lt~
;.
, :'-:
.... '""er7 rarestal",e,.
,l.
to~lh~.
'......
,.::..,
" , ' ','
"
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..
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~
.
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~el'lV.ra~~· ,( sOllie· ••11 .:t'O~ded}
. l. .
'Apa$ltepi<$.$m$ :d4,.!liQ'. ra~ely 1!lIlla11'~$tal$ ~r ztr~on
are ~q~~~e4 ,,$ \b~••f>llle . ifB;lnJ· o:t.blo'tUef;ndlea~ing . ~at .•
these; ~~eJII~~t-~. l$Y!\l, cOllle t~lII. ~e, same .soun:~;
., ....
. ',' ..'l'~~ c.•Gt'iX1s "\«1'1B;1 '. Ul the :iilbgaIspe¢1tJlene,h' no•.
l..._t,l'$'l't·i/J.'t -wh1¢h!s ptoba1>lV ·the: ,,,••Utt .
.f.·a1w~a1;lPn'•.. ; '1;t1;t1e '-8 pl""X'Vtl:l in .ect.:1ons ~t .peclmene
Ilud.P.llVe).aU, d
I
"AIf SIld ,~Q",.
. ,.
In .sPltCJ1!lien' "Bu,,·and' 'm9'l'ct',p~t1Cu3ie;Z!l\Y'. U!.'''DIf t_~1:'
"I
~'
" "li
tlakfsQ:r a'JJllca~.oUB,.s.a~~l wIth hlshe".blt'e:t'r:l~C.t
'i.,.~
P~'llll:!t1.n::u~tlt.••:rlCl\.1f, .0.1' eo.e 1'\,,1$le4 ~...m ' i c a ' ; ' j
IJ1iW""" .•~.~ __ 4e:~1"1'~+ __ ~a. ~,h~~ hM ~lll~a~ c••~~~ . 1.,:
~l.talUl¥.(l ~ .a '~.~.:lIl~~ •. :,i"'nl tnv;edtss:M,,QU' "o~cl
'be AflO'·.8@t;o~ .• d,tn·tl;nCl'/.1i~~ );Iut, it ,~. no.t'l'et );l.~. poal,ll:b1,e'
tEl. aepant,. th~sma.t~,J't~~ .,
Insp• •"
":a:IJt.tut'~lllea\tni
lllatel'laltspal"tliV ·."eflY
:t'Ue ~~ecl' ~.1Jm ll.>r.l;}.~j;ahc1l1o.t'l.~. $itiparQ,l' eolG.U1'i.ns
lIi~¢'B;Q'.• ~a Clay.
'i
I
.I
2 8 3 (\ () G
"004:
MELBOURNE
Tl'IUJi!ts 01' qal~l te- ue pr.,.t in sOlie specimens
oement a.nd l'8Plaeing aometllll8PU poa1n80
§PIC,III A" Grain size
U
0.2 .... 0.4
lllace••
as
01' d.tri t81 t'.Pagmenis colllllcml7
II1II.
WyDJilB IiC Gl"$in sise
~oth
OFha
Angttlar.
Bloti t8 18
COIIIIICIIl
1D
l!>.05 "'" 0.15 II1II. Grains
~8d, weathered an4 s'\ained.
ChlodUe,
pa~lol.s are more abundant.
This may represent
a stage 01' slower se41men.tation. Cementing
aaterialeontaina traces 01' a hydro-llica (,) •
. §,i'I§IJUm ."Silt
eOlimonl7
Grain size coamOD1y 0.5 ... 1 l1li. Angu].u to
...1-J,OOliIlded. predominantly -rolcanl0 rock,.
minor tel.~art Tery Itttle qual'tz.
§'rJii!Um "2: Gram dze cOlllllw10.3 ... 0.5
Qarbon18ed
plant l'eaatns ,001llll01h i'ra.gmeat. or 'Volcani..
\
.
roqt are rounded, ."thtred and stained. 1I1n1'>~
iqib'o.-mlea (t;) su1-:routtds detrital grains and
pro'ba;b1.1 dn.loped troll oementing cl&7.
~"l"
1lIIl.
Grain she cOllllloJU:y 0•.2 ...., 0.3 ma. DetrUd
quartz (angular) i.e lIlore ablltldant 'but sUll
subordinate to, tragmente of T01canic l'Oek.
Cemented by '9'ery tiDe grained ohlori te and a
mIcaCeoUS ola,. KinoI' calcite.
• • • • •
,
\
283007
005
MelBOURNE
,~'t!m ~ .
~
~
.-
CO" 1
, Hi''' CO" 2
"G"
COl'o 6
/lB" Qor,e
"I"
"J"
"K"
it)
Core 1.3
Core 16
Core 11
11.583 (he4lT7 minerals) Quartz gr1t
11.577
a$OS8
11.578
ll1':ltoS8
3,826
S,e15
11,~79
CimSWO.
~
),125
7,94)
9,5G8
11,238
OF~
11.,$79
lIoJQO
<
"-
11.581
11.582
$rkose
arkose
arkOse
arkose
~
I'
The spee;iJllen tf'om ,core '1 ~:l,12S :ft.. ) dlNns:tl"OIII. all the
others in that lt h cO]lposed ma1D.l'Y of angular to seE11-f'_OUDded
f!~tz ga1Ds COIIJIlcml7 0.2 - 0.6 JIIlII I'iiftl17 to - mm ~
:flakes or auacOTite are present, lesser biotite, Tery tew
h'aSlllonts or To1can1croc:lt and. re1sparo 'lhe:roCk 1s partly
o••~ted -by whl teclay"
The gra1D sbe TlU'1es 1D d11':terent bands and .1i!IR ttnel'
sra1Ded band catains streaks or blac:lt carbonislld plant debris.
T~:roek
1s too fitiabb hI' satisraotory seo-\1onmg.
H4ilayy II1Derille separated in bl'OJllotOl'lll inolude;
To1U'U.11De .. Abu:adant as anplar and prislllatic trafr"
ments to .0.4 1iIII. lIa1Dl; shade'; of brown,
801le blue. P1'obab1y derlTed trom a local
gran1tic toc:lt.
Opaque 1i'9J1' 0:;1dos, U.enl to and leucoxene ... C.-aGllh
zircon
- COlliDlon. Prismat1c CrYl!~1s to 0.3 _.
'
long but generally smaller. II~ show
zoning and incluslQD.s, bubbles,
Some have brown to pinkish colouratlOD:.
Ganel"a11y little evldence of 1'0unding.
Fow well rounded grain. aa)'be hooa a
dit:ref'ent source.
.
Gamet
Apatit.
- Very rare - angala~.
.... Ver,. rare (1 gra1D) strongly colourtd reddish
.te.
bto1fI!..
"
I
283(108
'OOb
·,V
OFF~t
M....OU.NE
'l'llore arealeoral'.ardns Of8!l.Wld~U;t16d co1Q~1e.e
mlneJ"a1 (biaxial, mOdel'ate relief').
. . ..
,
.
.
-
~
,
,
';
·1
The IIPectaDS
1tpll ~ "K" are all a1milllU" Ui ,tha t ~e;t ~
.
.
(ioapoeed
of
de\rital
tr8.penilLa " .nne
-!ned volcanio rock
-.
. . . . . . ,.' ,'\ ,..
(anclesltic) or nr7 variable texture, vains 9f'-t'eJ..sp~(plaglocla8et.r~oe1a.e
~e .1Cir~1J,neh
grains orquart'l,;.,
"..
'
. '..
..
.
.. .
scaU.ftd ~lak.sor
bhtU.
aM.
Jdnor
heaV7
m1neral
g,1'Ili,ns
. .
f' '.
7.
.
Oem.ted aa1Dl7 b7 a tlne gralned ~en chlorite (authigenic)
and illso eon~ini,ngTer7 nne gr$lned epidote. Idno," albite
and/or atlne gra1ned .eoUt4,.- ~
,
~.
"
(lila.
"
The de1;I'Ual ",au$ 8.i'e 11',11 80:r1;04 (commorU7' 0.15· 9.3 am)
but var;v in ~ IJlze .in d1fterent 8peC1m~!I, aIId occaslonal.17
in .dltt.ren~ 'banda 111 the
SP.e.D• . (el-g. "'11").' B~ng
p:t,.anes Were net 9l»aerved but elQllgd·.d tragments,
.
. biotite
ria.a. and 1n ,ftp" shHds ot piant dobris tend to lie1n a.
hOi'iZQI'lW posi UQD.
.e
Boal)'
.1nel'U8...ep8.rat~ 1n bl'OIIof01'lll
and ftJ" are ae 1'o1.~".l' "
hom BPeQ1mOD'S "p"
;
Adgular tragmeats or a1crocr7sta111ne green chlorite
fro. lnterstlne are abundant, pal'Ucu1at'17 in fIji". '1Iarl7
.
.
f
these rema1ne(iJ.euspended 1n the 'bl'9ll_tOfll (S.G. g,.SS'" .a.• 9):.
of
OthEJr'
IImerale of claetlc8C!dimontary CJl'lgin are;
bl'OWD biotite
~h1oi"1to
nak
OOlllllQD, partl7 bl,aebed In "3"
ItJ" -91117
opaque !~ ,~util4,e$ ant leutoxene
P11'lto ..... ~bl0 CJiY8t,u., auth!gett1c IIF" oiU7
apatite ,.. COUQI'l tn DOth a8 prlBD1litlc Cl'78tallh
cleu4;v and pleochroic.
.
d'.Con ....
.
SQlle
1!IU1.). pr!~U~ C17s:tia:t. II • generall7 sh.aw1ng
no "ldmoo; of'
~un&g.."
"
2 8 3 C0 9
,
~p~I1Q~
, .,...
ptn.et,
..
••N,t
'OFti!E
'...'
__ ,sra,,,,n.e•
itae."8,};ly _P1U. "
'
~O-!lDl.,
JaM
ltf!. EI.$
.
. : .....,
MEtQOURNE
.....,
....., T!.W
",~e~
"'V.'vs· ,ti,e" ."JI.i~lY~
w,tll..
_.
ephtU1e
... ''''!e~V
T # l""re
_c J
toll1'mai~.-
'._,
,
~."
I
ve:ry pare..
.'
1,
,
•
'. "6#"
'tlJIi .
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,
$oja. o,t the\)lotl~e' ,pa!tt$ '~o1l1aUl "lS)ila;ilc,~"ia~U of'
apa1:1ie•. ana ,":ertr&l'eb .Pdl oj;y$~11l'o~ zfl"!!cm.. h~1011~~f,
a
,l!ilIllU~'
neav
to tho••
,t:lglnto'l 'al~
~.elnUJelO.ltI.
'.
-
"
asse.b'lase~. ,\h.oTe.lyln,g ,q.uar-i;z, ~U
tonrml1u.
~:b'V.Z'7 :rat~.
"
at". ve~."~t1ai"
b<liiltllhel' a"as.,. :Th. ,
a$s8lllblaget,\l,~~eZ';.dl~.r$ :lII8rk o411 t'Z'QIl1
anauJ;ar
'
lnbe'.~$'~O.~il•• ·~o .$pe¢;"~s
m.·.pe44.1Il_$~t ~rk.liJ.
tb..
•
•
-<"-.
iu,.a~ .tn.elOd
", 7~.$ ft.) J.n w1lb,h
1,8 1:4. mo.~, a~1i1\l~t. lntn~al and ap~~1te
,"
"
"
1ji'litAunS U,J'rbit. '
'~n
sPcetmel$'
",tt $« ",H
\h.ed,eicrUat pa~$ al"¢ nft
1h~·lntel'.t1.<tfJs ql>a~atn: aVft'y'tihe
U
"
t>3,ios,i, paQke<i,. 'Q8~ Q'E
~tn.dp.• !m~.d'e 0'1 autJ;i~g_tO~l'~gJ;l1, laUCh ~;t' Tf.hl~
OCQ,~S,c.l!I .~u.i1e 't1l;~es ortl~1"$or.1,~n~t§4nC)~~
t:Qtli!f:'
sut.c. tefthe 1nte~l!It'¢:e. liJ01Ile of th1s has .. toehf4t:the
!nll.s ~e\w.~t.6? and. J. .6J ,8,)icd • .maina suspended ,fil;l l1telnol"Oft '
$~,8Pe.'t;la8~.ipoa bta.ms ~~J'~tf). u. h ,hQPed.t)iai~:f
~4~1~b~ .~~~tf~8 b,. ~••Gt'.~l.iJ~C1,~t;lIlatt,l'ta1'lr,l~i
b••~~dn.d 'E• ." 14en~tUati~ b,Y, X~ra71nV!l8tl(Ei.\lcm.. :', •.
la, ~.4illus,it!1i'" ~() "ltD""'" .~oo 'ttlab~e' f~~ ,.O~iQ1hg>
.-.r,r t1il:tvatn,d,' epf<lotefl.as+t:Q1'iA'. d_S' th. bol£4ai"les ot
.1lUIQ' a.~!'ta1 'n-aSJilonhc'Md ~Jil5t .•'; Wh"Z'e th~ae ilPe
¢i.felt,- paCked, '1ih!s dho:t'tpld<i\e,' Is all that s/tpara't.s
'
~. WMrlt @.1Q~it • .an. ~;Pld.pi~ till'.;~otll., Pl'e8~nt in lfite~'
$'t;1c.l!Is, 1ib.Q" tp,$.1le-te ,t,'$l:olll#iordr d'ong~e b~nnd,:an, t:lgt , , "
'
C,b1erHe i'iu-tbe:r 'U1:, towe.~$ ,~(~;n\tre,. bui; the,.a~e occasional
ecatterlJcl _tn,.s,. ~e:tepi4O:t~'rdrl"Q@ao4 'by 'ehlQ:rlte'~,
••• -
•
,-
,'"
.- .... ,
1O
•
'
283(\10
Sillllla~
tine' gJ'ainea epidote is .cattered through' a .
nlJll'J:)er Qf dotrl tal roQk fJ'aSlllents, parU,. l'oplaQing them.
Tho grain size of the epidote varies slightly .in difterent
specimens, and on Occasions in the one thin. eej:l,tion.. No
progressive change with depth co~d be detected.
In some interst1cos QD1y partly tilled or l.insd by
ch1ol'ite, the centre has been t111.sd by a cQlourlsils mineral
w1 th lOW retrac,tlve index and O·OIllllOlily showing waTt extinction.
Th1ema7 be albtteor a zeo11te but 1;10 11tt1o is pl'escmt ~t
it h not posetblo'to separate it tor' 1dent11"~cat1($•
.
In all $pecimens "p" to "K" Jl8J\7 of the' detl'lta1 plag1oola'se grains show Iii patchy JooplaQelllent by a colourless lIineral
.with l ...er "tractive index (genePaJ,.1y betwoOD 1.52 and 1.53).
'rhh 1s biaxial w1 th large 2V, and frolll available ev140nce has
l>sen tenta1i1velyldentUhd as .albite, .'but the pOlls,lliU1tyo't lil
Z,ollte mineI'll! cannot be dl0olQ'dtd. This mineral occurs ht
Vf!li"Y sllall pains end in thin t11111s IUid U has not yet been
possible to sspaPate eutl"l¢ient tor identification b7 optical
and X-ray lIethods.
In thtn sections ot,specilllene "G" to "K" there are seattered
al'Oas whero the eol.ourles$ lIineral l"\tPlac'1ng tel.spar' paps.
extends ael'os.~in botlt1darle., and, aecolDpan1e,dbyd11oJ'i t!';
partly 1'\tP1aces BOlle fragments Of volcanic rock fo_ing a lIIore
or less continuous lIosaie of strained and 1ntel"o-loclting gra1lls.
The aot-tied appearance of ffG" in band epec1JDen is UlIOst
certainly due to deT.lopment of the.e patches Of secondary
a11111;e Or zeolite. In epec1l11enll ":an, III" and ";I" these areas
are J'ather mo". abundant but thero ls no very mal'k~d change_
In "!t" it lsJllol'eextflliBln b'ut there is eUll 11tUe ehange
1n the general aPJ1eal'ance ot the l'Ock in thin 8ec,1:1on.
,In BOlli. places where 'tolle Becondary $Ibite (,) is in
contact with intersUtial ohlori te, a slightly brownish, VB"'7
_J
.- ,-- ..
283C11
9."
MEt..8OURNE OFFICE
t'ine sra1~Uld ,1'1broua, zon,e bas developed, ~pp~entl7 ~7 ~act1on,
and in a few m;terst1cflS chlorlte bas been alAlost. cOlllpietel7
replaced b7 the colourle.s .aineral;'
•
••
,
1"
-.
•
J
.
,
••
••
•
..
-
Thero 18 no nr7, det'in1te obAmiO in the ch1or1tef'rom
.p~,1rI. ttutt"o ttJtt', ~u:t '1D "It". ~t'sb.ow ••orebrcmil~ cQlow.atlon along boundarles ot'former1l\terstlcos where i t is in
contact with epldot6
-econdarf aibite ana/-orzeo't1ii••
.4
Al.1!b~uah an 1neaU1a~
m••al~ 01' ~b1te (~) 1lpllore, 01" leile
ctmtinuous in PlacO. tn sped• • "J:ii, 'bQundari~8ot, t.h.eorls1nal
detrl,tu t:l'aSlll.t. are 8101'11 Clear anet $how no e'f'14ence' of
dlstort1on. -&n7 are marked br l1aes or Te1";Y r1Jie gioained
ep1dote Q1' b7 ru.s ot chlori tee
.,",#
It: ah~d be lIIentioned here that in soiae 8urraee
speel.ens ot' arkose descnbod in a pl'evloua repor't(thmseo-'tion
-.17] ~'Boo1a..~a: and' .ore pal'tlcU1arlysocU.a, 11,.177 t'ra
B,"t}· tiher. 18 ~tb.e:i'.ore) seccmdAl"Y alblte( t)p:res~t •
_t.
oxtendlngae-ros8 IIl8.rlr
1'0;'11\81"
'8I'a1l1 bdundari.sani' tU.-llng·
m:teretices.ch1OrUe'U slr6t'ion
staintni to that lD specimen I'l".
~he8e
(a)
.,.177 shoWe sbUar 1?'Z.0wD:
"
t'aQts indicate two alter.aatlvosl
The amount ot'seeondary albite (,) rep_cing telsl'll1' and .'
S:ltten~1ni acrOeS ,01'ller grain boundaries ot' devltal .
t'raSlllents and riil!1ng inteX'st1.ces 18 Dot an indicaUa
01' ,th~
degree ot' .etamorphle.
d~e'
to depth.
b~I~,'
.
.
. . .. .
"...'
,io
or
(b)I.t '110 ,h anindi,c,atJQn ot 1ncruse.d metamoJ'Ph1sm~ ~en '..
ark.se Dtw oxpOsedat 'the sl,U"j'ace ~ 1>1ao..es (e..g""Jlt. :8e.t)
tn, 71etoria ..-as tQl'illol'h- b~l.d· to someo.C\Ila1del'abl,.,·,
aepth.., .
• •••••
,
,
..
'.
,
"
283 e12
In.
MELBOURNE O~
COMPARISON OJ 'fABIANIAN' AB)) VIC'lOR1AJ
. SPlQIWS
'rlle epeou-e t)'oa the Jl'1-nsal. bore, '1'alJlll8D2.a, are ela11ar
to speclaens o~ aJ"llo"e 1)'oa Victor"a 1D the f'ollOlJ1Dg partle1,1)."I'S;
1.
'they are coaposed lal"gely Qf angular to sub-angular,
aend".slzed fragments of fiae ~a1Ded volcanic roek,
proba'bl1 auCh ot itot ende81th CGlllpos1ttcm. The t'OCli:
. textures 0'1' these traillltll1ts are Tery Yarbble ia aU
sp.clac8 both from TaSll8Zila ~d bioa Vlctoria, end 1 t
h unilkelY that th1a ,,111 be li)fu.. 'torpurpo888 .t
cOJ'l'elaUonQ Many ~ti'l tal fragments lIhow1Zig aler.,..
p.orpJin'lUc, tftchytlc, encteaitic and tlOlJ text111\'os It&
Finpl lipeclaens a'e 1Dd1BjiDgll1ehabie trOll detr! tal
trapentlt in aaD1 Vlctorian rocks.
2.
Dd:rit.l f'elspaJ,"' Shins, blcl~i oUgoclaae, lilb1te.,
orthoclase and rare miOrOJ:lUlle ue CQlIIJDOJi in a11
specimeDs. QUartz gi'a1D8 (SQeJ'aUy angular) occur in
aore Tart.ble aaoants.
3e
Detrltal flake. ot brown. bloU ta are acaUered through
all ,pectaena. S~ have b,en crQIIPled, tl'ey,d au4
parUT .1'tel'ed•. 'they tmd to 11. 1Ji a air.tlOZi l'ougb1y
panllel t. the b.dding but a8JlY haTe been bent aroun4
ad~acent rock OJ' .tnerai trasmiDta.
4.
Aaaablagea Of heaT7 .beral il'ains or deb'ltal ..ed1llentai'y
orl~ are 8111111ar. Apart fro. the abundant brOwn biotite,
opaque ,ireno:dd,s end ;a.euco•• , apatlte is common,
dl'con .l1ghtl1 le88 commClD, aid epidote couon 1D place••
(JUler
cener~1T T81'T
_!nor cOD.\1"Wan".
a~ ~.\',
....~
sphene end 'toWl'lllaU.ne. AIIIphU~o~es end PlrOXene gra1ns
are present 1n ..ollie Vletorlan .pecilllens but were not
~oted f'rae :the Well1D.gton Park Wolle
Chlor1tlc f'rallments
til 80me J'1Ilpl r,pcltB may be al~er.4 fe~gnesian ainei'als•
•
283(113
MELBOURNE
o~.
,
A nuabol' et the pd8llll't1~ crystals ~t apatite trOll both
the J'iagal eel Vl0,'torbnspeeilleD:B'C/Qn'ta121 '9'\!IZ'tleiil l,121es
0'
IIllnv.~e
inclusion, or ue cloudy pe7 t.o recldisb brown
and ,pleoenz.Qlc.
' InClusions . f apatUe,. and. lIore 1"8:"17
,
,of jll!con are pre81111: Ulb10Ute Sh~8.' "
5. 'Although Sh121 sise '9'ar16s in dirterent spec.illene, th.
detr1 tal tragments end Il'Uutl'al gra1Jls ,Us pnel"a11T ,well
80l'Ud' and the" 18 no ri'ldlince or Tory,f121e :~1n.d clastic'
detl'ttuiJ. Denni~. b84A1ni p1_ea".re'nOt 'ebserve4:
'uisee'ting that se41aenta\lQJl waacon'Unllous"
Carll6nb8d
ptant~121s
ari pre804t 121' iipeciaena ~~
.'
.
. " . ".
.
both il1'ealJ.
.. ,
Qai~lte,. . Pnera;lly ~ It 'Ten .lI~or
c~~thu!!ln1ioceUl's
.
...... ,
.
7•
.,
'.
".
~.
1n 1'1npl and 121 Vletorlan speclaene pa~¥, :replac121g
sOJle relspar grains, and partly
as cem.ent.
,
.
8.
!De~1ta1rrasmflllts,in
W',8p,"1JIens
boa 7ingsl
bON,',
.f·.
, . , ' '.,
".-,
sh~w 1101'8 eT14ence, o't 'l'o;m,d1ng, wea the~. a,nd ,staubig
than ha. ,lleen noted. ,ill Victorian speciaens., lloweyeJ".
the.e spooiaens m.a¥ not be t71'1cal ot ~e aree as a whole.
,
' .
~
'.
......
'
-
The speOl.ene rroa 1Ih. :FiniS1 bol" diner 'COa Victorian
spee.ll1Cle lI&~~Y 1Jl the naturo of the 4emfiDtilng 81ateJ'181 ~
.ub$.q~ent htstorY:
1.
1Jl 'the ll'Sngsl epeelllens the eemen\1ns II&te1'tal 1a now
Dla1Jl17 white clay, .but how much or tll1s b due towoathel"ina
and JOeplaoe. an eat-lie1' CeDlirn t121g lIinel"U 1e not, !alQWD.
In SOlie s»e01*en8 ~\ho8e OOJlP•• ctd~r'\mol'e l!oWldctd. en4
weatheH4 paS;hs) flabs o~ a h7drQooo!atea , showiDg ,h1ghel"
doUble i'et'Joac>~iOll than tbe lnte:t'sU ti&1 clay ha....
dneleped alGrlg grain boliDderiee of the dell:l,'1 tal t'ng"
mente. This 1s pJ'eeent:1n. ",.n thin rUms "8hd, 'it,has
not yet been p.s.lb1e to separate it ror 1dimUfieation.,
,
283014
012 .
It proba'bl, e17ata::J..lhtd boa a oi.,. _ineHI.
~.
E;~ofl\e,
the 1I"~~~lD14an" ctlllQtlng maWlal.1n Vlc1;or1an
spoolllefts 111 now' p~.ent o~7 in ...e~ 1JIIIIl11~f)lU1:\a ~. >t~
:£1vo 12,npl spee1ll1en,h '1'00 IIUdhslgnlt'lcmce shoUld ·11,0,",
be P1a••C.~thbas, i t :,IIIay Ji~"eb.(m pz:esCit on« b.on
al~.r.d to 01&7. but te~t~. tnrlcal ot the cement~g
chlerl
t'- in Vlc,torlaii. 8"01m~s ,,~re not" o~~.~~
.'
.
.'
;.' . ,
'.
3.
'.
" . ' .
Very fine pained' ep~4o~ CQilm011alqng gdA bOlindari••
in Vic't9l'ian ,speeli11ens waa. not Ob/sel'Ted ~ ~~ae tl'!ta
~~~!ngal, ~ore~
4~
~
fioc0114a17albl te enajor ze.l1 te wesno.t obeel'Ted crosfdng
~~ bO\1l:l4arha ~ oceupnn;i '1ntel"st;'~ea 1n the Fusai
8~.$iiQa.
.
,
"
WKLBoUlUfE
S1hllJP
22nd Way. 1963.
283(115
THIN SECTIOn M.BS
-
(X.401.
Spe~ilIlen
"D" Fingal. Bore.· Fragments of volcanic'
reck have been rounded, weathered and stained.
Cementing materia11s fine grained clay with flakes
of a hydro-lIlica (') along grain boundaries of
detrital fragments.
.
CR9S~EQ
NICOL§
283(;16
14.
MELBOURNE OFFICE
"
Specimen "E" Fingal Bore. Composed ot closely
packed angular to partly rounded unweathered
fragments ot volcanic rock, quartz, and t'elspar
grains cemented by fine grained clay, chlorite,
and minor calc! te.
•
283017
15"
MELBOURNE OFFICE
•
Im.N SiQ.T,J;QNMa.i,t8. (X...l~
specimen "G" Welllngton 1'!ark Well. Closely
packed fragments of volcanic rock, quartz;
.and telspargrains. FUms 01' t1ne. ~dned
epidote or chlorl,teor both separate the,
fl'Sglllents. Elongated frs@lIentstend to be
parallel to bedding.
016
283(\18
16.
MEL80URNE OFFICE
Sped• • "B" w.U1DgtoD Park Well. P1De
grabed epidote (aarlt) oCCUl'Bu.S sou
il"ab bOUDdarles and 18 scattered ttu*ougb
fragments. In1:erstlc81S aJ'O tilled. OZ'l
I1Ded b;y-ch1orit. and SOlIe (CtlDtre) ccmWJl
CO],ourU8. albite E'}. Calc-1te has replaced
the elODgat.d fI'llpent ilUlledlatel;y below
the centre.
017
283019
THIN SECTION M.580(X.120L
;
Specimen "In welJ!lngton Ps!'k Weil. Patchy
replaOement of telspar grains by a colourless mineral with lower R.I. (albite'),
Interstices contain chlorite"epidote and
some of the colourless mtBeral which tends
to torm a patchy mosaic across grain
boundaries..
CROSSED
NICOLS
,
'
MELBOURNE
OF;k1.
.
.
01B
283C20
MElBOURNE
•
•
•
Specimen "K" Wellington ~ark Well, 11,379t
Although many felepars have been replaced
and there ia a more or lees continuous
patchy mosaic of secondary albite? acrosa
grain boundaries, there is little change
in the general appearance of the rock in
thin sectioJl.. Grain boundaries of original
detrital fragments are still clearly defined.
Pragments of volcanic rock have been partly
replaced by albite (?), chlorite, fine
grainednepidote, and in places by fine
grained, slightly orange or brown stained
. zeoli te (,) •
OJr!t·