,(~00) /(;l_ 9 0

6',0 7L/- 3JD

..

)

7

UNITED ST ATES DEPARTMENT OF THE lNTERIOR GEOLOGICAL SU RVEY

REPUBLIC OF OF

LIBERI/>. ' MINISTRY LANDS AND MINES

USGS OPE N-FJLE REPORT

(IR) Ll - 64-B

,o• " ' 1•;10· ·~ ~ -~"1-'- --I--,- .~-7 ,-·eo-: ·----, -· ---· ---.-------.·-·- .f:_ - ,r-·- ·1"· ·: . ,,.,;."4" . { - -----,.,... ,.,.,-- 1_,..___ _ ··--·-·--- .. ;', -·~--,- -;1·-­,, ~070~5 I ·---_,... -----J;t .'-< _. ,a., - • -"""{.'.._ . -•~"I 1 __ -, " __ _ / "• •• __ . __ .--·-· / : •.•~- •

--t_.,, · '·"·It" • - • .. - •----- --~-· "e <:--f...._ ·L __ .-.-.-.,-- ., l _ , i, ~::.f-1/P- --·· •o ,,,_

--------,. _,.,,r - - -- ~-

• • •• f.!if ,-~-7 •• -j / " '

- --- 1'' -- =.---- --~ 1,C:- ', ·' -" • I '" ,, ' /ff;,

, ~ ---- :, .----,/ ~ • /ff!,•,.'"< • r, omdt, <<J •> . - . ,. " • ,. .. . .. -"·---:::::::,----~-------~-,;,,,,,.,,/,' ::;-;· • ,;\ ' ' " ! ' ' / ~£ .... ~

... . . .. . -... - r ,,,,, • ,, ·; ,,,, ' Vc~ •._ ~ ..• ,·· ' . ' ; ',\ ••• • . . •• /,. yip

.. r-- ••• • • . · ~.q ·- ..,. . . - _ _,,. . - ~ - ,11 ,-~ • • ...... ;J'1,t, "; ~ I ~ • • • ! . ~ _ _..,,~·- _., : ·- - Jo~",,.__ • .. 011m·· "> : • . ,~,r,· '---·~_;'.'.-,-,:; i 7'i .<o . • ,!,~ JO :~ ",--· - -- -- • • • •~

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9n, •• ---:- • ~ M ,•a,,,_ •• . .

• • . -__w--

; f, ,0,, • , ,m •

- - , • · . . ., ·h, \/ •;.:, ~-~0~ .. .. .. . ,,,. . . . -- + ' . , ... •< • . h, .• • ~ . ,,,,, . ·, ' . "• '·. .. . ' .. . .. ..

O • • " , • , O o· ,., ·~ j/

5

,,, --i:io .. . . .. ... ..~ ,,,.,,,.. . --· . ' . . . ' .. ,/., '" .•. . •.. •, ..

'IS ' -

..., _______ ., --- - -· ':."-~-- · - • • - • -- -- - ->-!! .. ,,.,.- • ; ' • ----::-.sf~ . ___ .- _____ ,. 'l e' --- --M / = -y--· • !"'"_:.-- - - - ' .• .-·-·- .,. __ _ _

"' ,,---- .

. ' • ,,,.1,, • - -41- . ,.,.,Jf,, 7'

• • .« · /

." \/J,/ -- --­-"""' --•cc._ ,.,-;,· --

_,., __ _ ----- ·~ ,1:' . . ~ ~.--~~

qn, ' ~ • • _...<, /' ,~··

_..y ~ .. . '. . ~ . :- -

' . . . , ,,. . ' . ... . . ' I. . ,., ' "'• •,g . . d • "' ·~, . . ' . . .. .... . . ' .. ... _.,.. --.------ ,' ; · " . . . . . . .. . . . . - ... . .. .. .. . .. . •1 ' : '° ''" . . .. ., . . . . . .. • ' .. • .• • . ., '•1 ,, •,/ ·---~ ·'·- . . . ' . ... ~- . " ' . . "c..,c~. . .·· . . . .. . . .. ........ -~ . "l'i;---;-y·;,,, z • '"" • • • ' ., ' ,., • • .. , .. .-,~., ,J

·•'f

-,-r.;-\'."" . ----~.·- ""'" . "' --~ --· 4, 't.,;_·~~!-if ·~ '{~-~

1, p ----;;;'f' ~_:;....{~ }.Y

60 · - !_ ___ ...----, i,

-__,___., ', ~ '.kl -;;;on;,_ , _ .. -;;fv(' ' " ' - "/j?- _,., __ ,,,

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- _,,.--,,,J,,

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,,,,,,, •

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• ' .• • .. "1' ,, / ' " . ..... . . . . ., .,, . . .. . . . . . . ... •.. . .. . .. .. ·' •, .. . ·• .. ' . .. . ''p'';<;:, • ·• • • • ., , ,-,, ' ,. 'w • • • , • • • ' . . . . . . .,.. " . ,.. ~' . ' . .. .. . ,; , , • ,, ' • • · . •.,. . ,3y ~-J:i 1r'/';'' ... ,7 · X ·... · · .:.,, . . .. . . ' ..... ,. .... - . ..

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• • • # .. .. • • • . . . . .· .. .

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• 'rl -~•· e , r {.,, If f., • • f,>211 ,-/ ,--: . _, . . . . . .. ,.~-. - . ' ... , .. ..· . •"' • ! ; ' ' ·""· · . . . -~- . <(A,.., -•

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~· C ' ,,.,. ,; ., /-' / _. ) m . y .. . •• ,... . . - _. . ,,:; / . . . ' '"k.:. . • ,~-,, . '/c' / ,.. ... .,, / ... •• , - - . . . ., . ,.. ,, ---'1 '",•, "'· ~ ' ,,,, ..-----x · _,,. . . . . . . ,, . .. . . ... . ,. / - . .. . .,,. . ~- . ' . ., . .. . , . . . ,, , .. ,,.· . . ·= ' . ·• • '' ' , .-... • • • ' ----·1 ' • • " , ,.. ...... -c .... A~-- -~ ,, ' .. . . .. . .. ..... .. .. . - . . -~- / / ,, ... . . ' . . /,, ""''' . . ~.. .~ . / . " ' .· = • . ,. ) . • . . • .. " ,, ~'/ "- X ' .-··· \' l / ., .... . . .,..,,.... . ... , . ""'' :. ,, . " ,., . . • . .. . A, ''/ ,_ ,- . 4, --;o·,, . . . . . .. . ... ,~,,,/ '°'- .. r· ,.,.* c .. . ,d . . .. , . , . . ., ... , "·7-~ .. . .

• "' ..+- " . • _h , .. • " ,, . " - .

• •• • ,0 .... .. 0 0 ' ,• /•/•/, cp c /'' ' ;;£;:' _.,. .,. --LJ

-¥.. . . . . • . .· '• ,., . ' . . . / "----:::::..-,. ---,....;:· • +· / • ··.. • ' • , / ., •'r1 11, j :· • ' • ,•·l • , ,.,. ~_:::,-,, e . /c .... • • •. • .. . . . .. ·. ' . . . - "" ... . ~"' ··- - • . -- -.-->. ~~-•• • i '"' -~·"· •--. ,, ;s· . ' •, . . -- h/,.,'./. .• . , -~- r ~ "k

,, !-lo:- '¥' Y;J;

rdf,

-·4S'

EXPLANATION Cor rclalion of Map Units

BB Cretaceous or Jurasic

~ Jlirasic

Strati r,raphic succ<'SSion not implied for the following units

[:]

8 G C'.:J C=J D Meta.morph ic rocks

B B 06 0GC:J

Kla

Kl'>

ld

L..i::::J

DESCRIPTION or ,V!.:\P UNITS

Andcsitc por phyry. \1edium gray, aphanitic dike rock

with phenocry sts of .sndesi11e arid hornblende as much as

1 cm long .

Bostonite porphJTy. Pinkish-brown, aphaniric dike rock

with a bunclant phenoci:ysts of a lbitc as much as 5 mm

Jong and of hoi:nhlende as much as 2 mm long

Diabase. Dark gray dike r ock chiefly diabasic but

locally gabbroic in texture; corlsisrs primarily of

calcic plagioclase and clinopyroxene, with minor

amounts of m agneti te and ilmenite.

Composite unit. ,\ emit comprising pr edominantly schist

but also abundant amphibo\ite and quartzi te, which impart

distinctive linear magnetic anomalies of moderately high

a mplitude; associated with reponc<l occurrences of iron

formation and itahir itc.

•

KAf' SYie:lW

Flel.<1 Cota "1'0 '"'"" b> cooverrt<onal. O)'lllbol.s; other data

oource, ac• ir,Hcaced b> letcer ,,.,oo~, a.J ,1acenc t Q ,crucC=•

s)'lllbols, or aT, l.t•H or lbc oe;;im,t t o ""'"' ,ne ,,,.001 app1'eo:

M, ,c,..,.,6~.,,,, i, oat o.; F, photo i nC•r~cec~CIGn) R, r<>C \ Ollletr,c d ata

- · --H---a-e --- ..s --a c.ontact

Precambrian

--'- ·< -- ~-- P-- a " ~

="'-"""""""' -~ - M - -t--

ft - ·-+-

""

9 CC?

~

'1l

~

oO oO ~~

+ + -<;- -+-

_L:.

,. +

r~ult·· U, uptOro.-n side; D, do"llChrown "'""

?l'>r'U..Oc ~sul.c--eavte.ca on uooor plate

rau l,. wne or Sl:leoc zone

r.u.1, irrtrud«! oy '""•

llntlfon,--abowing '"'"" of c"'stol p l.an• ,.nd di.<ect <on

ot' flu..,,,:e

o,·ert,u-ned ar.Cif o,,.

Synfono-• o\>o·,ioa cnce of c,,,u;:Cs plan• a od di,..,,t ioo

af ]>J.ur.i:.•

Over'- """"" s,c,f~n,

Ctril!e 000 a1p of ,,,<1 oJ. pl•-"' of fold

inclined

,0,-t.ccsl

St'11!e °"" ilip of '-I•

lnclio• O

no,1'ont "1

Vertical.

Sc dl!e &O<\ di~ o r foli~cion--ope-n ,,-001 ioili oM•• fo1'oCian

tr=., oct.lt"- sarlier roltot \ on QT ""'-'d ie.~; solid S}'lO'ocl

iMi.cates relot1oo , .o bedd in;; u.sltno,,.,

l c,ci.i1><il

Horirnntol

<•rtico.J.

G<rlke ani dip o f p•ral.lel Coliaeion &O<\ b•di~tl,S

l acl\ oeo.

Ro r iOMCai

;·e r tiool

ScrSI!, or fol.iac\oo, oo dip d•ce m,n""

- ---~ ~f ? ' ,. .. .. . .. . -·· /'~ '!i.. ...- ~- -,~ . . , " . . '. . .. .. .. .. ... . . . . . . • . . .> • ~o--~ • • • ", 0 'C <, • , <' ' - --~t, , --'S>, • ,._~ . • . ,'• •• •,. ,... • ' . _, ., .... ·~;--• .... · , :.,., . . ,, •• ,,, .... ,, -- r . +-,z;.~

JO ~jl "'' ;/r-,._ .---..:: ,," • ~,' .· /~ ,'_:ff'.' "/'.< "'> - " " •

... . .. / . .. ... . . v,--- ,, • ·-- • /, • •• •· ·. . . • ,, ,.,,.,,,., • • - • . •• #y-~ •

/"< ·~- , · ... · .· -- ......... > • ,. . ·, - .... y-.... .c, / .. ·.. . ,. ... ,.. . . A' . . ' Co.;,;:- ( / m, , m',, • "','''·• ___ '-~ ,;,,,'(, ,/,," I .. ·'/ ·· ;' ~: , /r:\',:;:/' -- ~ .- ,

. " . . . •. ........ ·" - .. ...~ ' ,--"' /'" 1 ·· • • .. ... • • • • • .. ~ '-', . . . . . / .......... ... .· ~ -

~":. .~ ~- . , .y, ,/.,/,•,.-;, , , • 6:'~---+-p,; .. '\:/ ~~"",., - ~ ~- ~-- , _____ ___,__,~ - ~ ,___~, "·- -- - ~---•---+-r- su·<l!o """ dip of joint,

laclineU

,,.f _

I

.,L

-------~-r>,o'

r ---,-J'i2'L _ ___ _ _ -::~~~~1~-----;7~1'~r,1,1 .. ]JQ_OO _ _ _ _ ~ f;/ rl/1/A"r ~, .1, r11~,I'~ll[Yll!!!"Oo· 8"30' -J J / f I

. •000 I I ~,t/ _

'

020

1 Q · - J . / / Al 'l:1 ~<1,- 11• ~-- 1'1' I

4"30'

-~~-

wA ~

EX PLANATION

' Traverse roLltes: lJH = .\1. R. Brock; CH = A. Ii Chidester : E,\ = H 1_. Earhan: HE = T. D. Hessin; HA = P. T. Hayes: SZ = J F. Seirz

Data from Wm . H. /.,1u!ler and Co ., N . V . , on ly

lk\icopter - traverse coverage by M. R. !:\rock and A H. Chidester

Foot-traverse covera ge by M. T\ llt"oc k, A l'I. Chidester, and Jenkins Dunhar

Foot-traverse coverage by _',1, W Goda flaker

-,4,.

Detailed maµµing hy M. W. (;_ Baker ant.IS. P. Sr ivastava

In addition lO the above data sources, data from a minera ls exploration survey of the quadrangle, carried out by Wm . H. Muller and Co. , N. V, in l9o7-197 1, was utilized In the g<o ologic compilation. Da La po ints fnJm tll is survey are indicat<od by dots on the geologic map

,, I

I ,i, l

,).~l~ -,ff, 41! I/

I. i"\i .::/

,, a , -1t%!': -

I · %1$; I /1 / I 1 1 1 · •• -. I I 1 / ;( /1 11; 1// •1/ --:::;S :'8

//1;1!/I;~· l//;/1 l;/1,//~~~~~ 1:: i/.1·: .'!I 1//;, / I /1; ------- '

, /JI +/+I-/ a -/j-.,>~ :--._;-.:: . - i <:~.:::<:::.:-<"' ' '"' '-.. ....

' ' '

::--::: : '>>-:c:-:::.-::--:: -­" ~ --- .,..~ ~( ~~~-

4"Sd

'""" 8"30' s0 00· 7030•

Figure I. MAP SHOWING SOURCES OF FIEL D DATA FOR GEOLOGIC MAP OF HARPER QUADRANGLE, L IBERIA

... L_ L _ ~-O~' 1'•

Comp il ed by photo-p lan imetric me thods from ae ria l photograp hs taken 1968- 69 The internat io na l bou ndary m us t not be c_onsidered auth ori t at ive Form lines have no consistent interval and show only the general shape o f terra in Geographi c g rat ir:u le and rectangular g ri a based on Ho t ine 's Rec ti fied Skew Orthomor phic projectio,v

I ·-4r,-

/ U. S. Geological Survey '"-- OPEN F ILE REPORT 7'/f--]I (J

This report is preliminary and has not been edited or revi.ew-ed for conformi'ty with Geo!ogi.cnl S urvey: sta.n cl&rds or nomenclature.

-,1v------ --·- ---- - -----

5 0

5 0 '

5

JO

~ -- ~ ~ -1.• \' 'ol ,,. ., " ,,,, · / . ,., - ... --..... . - .. ....... '• ... .. . . - . -- .... . . .. ,. . " · -" " . . . . . ;,,- ,_ ..

.. , ' ' ><··.. . =' >.,, ~ . ,. ' .-c:?-· ~ - , .. ,,, ='' ---:~

,,.,,.. ... /; ?.," . • • J£J~~jf:?~Jt, ' ~:/

I 1"'

//'·

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SCAL E 1 :250 000

JO

15

l

,c

,.

15 20 25 MI LES

'" 50 35 K ILOMETERS

r+,

-+'-/ ,. . • ., _r__ // ~ ,e;,.

' •• . ', ,:', •' ' )1 .,.,, ,,, '"'" ,,// '/' -::-- .. • ..... 0 .,<;,,? • ___ ' _f ff:·;,~

'~-"'~ ,.,,, 4~ (,2=------~, I'.., ~/ - " 7 · - • ' ) _,..--;;~ ~-/ " ' ,, --..-- /:, • Jf ---•, , .,, • - • !,t' .. " __.,,_ '" , · ,;. ,•,, :/

~ · '/'- •• • "' ·-r"' ·c!/ ., ~- 4'../ . ., /··),:. - "' . - -~,, - "'' / - ,·'J J, , 'Yf _ • ,•. ,e ~- ;,,,.:_. w 5,r;,>,;, , ~-/ ).- f J,.za B'i

" ,,- " . -,-,,...;. C7 /,, ·- . ' .A' . .

.,.

" "' / tfu~ Y / / o• - ~ •• _y ---- -- -~ ~ - ,.__ ',, - -i;-E, "'""'-80 / /'!O -

~ );'0\M~ I cc," ! .::, I . . I '

' £

·, ·- .,\ 1·

··-~,':,<.-'>--',-+. =--+--.J,+--e--i.!--;' I BbP;LU ZORfR /'·{' .•• , I

'°"'~ .I '" ,•" . I - ANOK Lr

M~~OVIA GBANKA

,• cilcJ:!~AN 0

''i , C•

'L__!L_'_""'" .. .. '~ -~

zw~tu "·~.

I I

INO<X NAO o• u0 e o 1• SSOWING COCATION 01 OJAOO.,NGLES

/

'9'.,< EJ

I

I

I

1"' i

__ !~. 7".10

PREPARED BY THE US G EO LOGIC AL SURVEY AND THE LIBERIAN GEO LOG IC AL SURVEY UNDER THE JOINT SPONSORSHIP OF T HE GOVER NMENT OF LI BER!A AND THE .-'I GE rJCY FOR l~JTERNATIONAL

DEVELOPMENT U.S. DEPARTM ENT OF STATE

GEOLOGIC MAP OF THE HARPER QUADRANGLE, LIBERIA

I

..-.--;;-;,·~·--·'1,,0tOGICAl sci,;: ,5,, V: s\0r-l , V , 1:Y\

( NOV 2° '197~ "I.) ~Q_P~

-by -

M. R. Brock, A.H. Chidester and M .. W. (C:-.Baker

~~~.,--.. .., :,'· ;, G..:.0 Li;,. t,,. 5Ul'>"""',

( ~.S· , I '' J . "Y<y,

NOi" , ,,•/4

\.<,;Fl~

i.

is

" am

q

sm

mi

'"2

E"'

CJFJ§J

~

r,ngd

I gngg

manganiferous garnet rock) and carbonate facies (quarcz­

manganese carbonate rock). Sooty black rind on weathered

surfaces .

Iron formation. Lron - rich :;chisrn incl uding itabirite and

s ilicate-facies iron formation. Associated with composite

unit {z) in schi st bc"lt and dt!lineared on the ba sis of srrong

magnetic anomalies.

Iron for mation , silicate facies. Dark greenish-gray iron­

rich grunerite - hornblende-.quanz schist.

Iron format ion, oxide facies {ita birite). Mearnm to dai:k

gray, finely laminated quartz-hernatite-rnllgnNite rock.

Amphibolitc. Dark gra y to dark greenis h-gray, coarsely

foliated roc k with approximately equal propor<io11:; of

hornblende and plagioclase; accessory s phene ubiquitous.

Distinct layering reflects variations in proportions of

essential and accessory mineral s, and in grain s ize.

Some layers contain minor amounts of quartz.

Quartzite. Dar k - to Ught-grav, medium -grained rock with

quartz genera1ly i1' excess of 90 percent. Locally contains

accessory garnet, magnetite, and pvrlte.

Mica schist. Gray, medium- to coor~e~grained quartz~

muscovite schist predominates. Sillimanite is common,

staurolite and tourmaline locally conspicuous, . and garnet

generally sparse but locally abundant. Contains numerous

small lenses and ir r egular masses of pegmatite rich in

coarse muscovite, and generally minor but locally abundant

intersrratified biotite schist, quartzite , amphibolite, and

gneiss of predominantly quartz diorite composltion_ Outcrops

generally sparse and deeply weathered .

Migrnat i tc . H:,rbrid rock consisting of folbted mafic rock

fragments, le nses, and layers (palcosome) in a granular or

we akly foliated lcucocrntic matrix (nco;;omc). f'a!cosome

is commonly amph ibolit (;' , but biutite-rich gneiss is not

uncommon . Neosom c ranges from q uartz Uiorire to

granodiorite and granite in composition.

Composite gne iss. Predominantly biotiw quartz diorite

with abundant imersrrarificd amphibolite and quartzite.

Graph ite and garnet common a nd locally abundant: magnetite

locally imparts distinct magnetic character. Moderate

to strong magnetic contrasts a rc characteristic of tile unit,

and small local h igh radio111etric values near the norther n

border of the quadrangle suggest the presence of numerous

small granite hocties.

Leucocratic gneiss. A map unit distinguished on the basis

of brood low magnetic conrrasts.

Qu3rtZ diorite ~nciss. niotitic and hornb\cmJic quartz diovite

gneiss, gencrallv wii:11 strong foliation p3rallcl to distinct

laycTing that rdlc:cts variation in con1cm of ma fi c m inerals.

Biotitic 3nd ho r nblcndic phases loca] lv inwrbyered at outcrop

sc3le. Conrnins appreciable in ter srratificd amphibolite and

minor amounts of s chist.

Granitic gneiss Mostly bioti te gneiss ranging from

gram;Jioritc to gr an ite in composition. with minor amounts

of qu::inz diorite g neiss and a1nphibolite. Conta in s zones

with ahun,bnt po rph noblasts and augcn of microcline.

Weakly fo l in1cd, commonly displ3ys strong joint system.

Gra nodiorite gneiss. Predominantly biotitic gr3nodior-ite'

gneiss wit l1 mino r locc1l granitic bodies . Weak foliation

r eflects prcdom in:rntl y t ile orii.;ntation of biotite.

GrJ.11itc gni.; iss . IJioriie gr anite gnei:;s characterized by

high raJior:ietric and low m3gm:cic; v3lues.

•

,, ~

+ ~

~

" ~

' ~

"

~ _ ,o

;.~ a <c

Hor!,ontol

Vert<col

5tr i.ke sod dip of plo,,., !eoc-re, dece noioed

from pUCto \nt e,-,,retaeion (P) o r ._.,,.,_,.,.~,,

dat a (~)--on,, t,;o, or Chree t icks '-"'11cote

g entle, n@di\a , or ot<ep dip

Bear'. n,; o.nd plung e o~ ll.Jleatlo~- - ba~bed arrow iOOloa1.e•

crCol<.le axi, or lnceroootln;s foliaci.oos; SQlid are< .. 1odic,te• minecal 1'oeatio,.

StTUct untl cr,,oo •~•ed 0" phoco iotecpretaeioo

'"' •

Strnctural tr~nd°bued on magra,tlc•

Ob1erved ootcr<>p

•q - - l'larkH bed dl1tlngu11hed by rock 1yo,b<>l c,r ind1x •lneu.l

-'t ln<Kx' mineuh:

" ,:;

•• u

'" • ,l

" '

.~ Lto~,i~­Eow-ne«o

"0 X•

x,

andalaalte 1nthophy]l1te au,1te

bl<>tlU

clc,rite c,-tnstonlte•

1runer1te

diop•lde

Fo<•a loceJ ity

in·,ecC•Ocote

P1.ont

,,._d i°"etrte "<,O tn ~ . >·

en enot,.tlt e ep epldote eu eulite

11 garn•~ IP guphite

h he>rnblende by bypeutheDfl

1l 11-nit•

k kyanlta

• ...,•covlte

l'l' pyi-tte ~ pyronnc

I eilll,..nlta et •UOU"ollta

t.t treaollte­actln<>llte

,.,,.,uc\a;y bet=en r odlcme·.rieoll>"• ~eten<inetl aec~ p«>vince•··

Pftn- Mr!O&ll, ,00-700 ~. y .: Ebur,.,,.,,, l6oo-2000 M, y.;

LlOer<..n, 2'700-3000 m. , _

s.,-,;., ecavel, 010¥, or pl.Acee pi~ · -B, bar<co; D, Q!-;

G, golO

;\in• or q""cr;·--B, huildin.,_ atone or "',./. ,oet o.l; C, cloy;

iron

Proopeoo p\c - -B, bar!t,: ~, k yonite

l---