,(~00) /(;l_ 9 0 6',0 7L/- 3JD .. ) 7 UNITED ST ATES DEPARTMENT OF TH E lNTERIOR GEOLOGICAL SURVEY REPUBLIC OF OF LIBERI/>. ' MINISTRY LANDS AND MINES USGS OPE N-FJL E 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 •> . - . ,. "• ,. .. . .. - "·---:::::::,----~-- - ----~-,;,,,,,.,,/,' ::;-;· •,;\ '' " ! 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'/c' / ,.. ... .,, / ... •• , - - . . . ., . , .. ,, ---'1 '" ,•, "'· ' ,,,, ..----- x· _,,. . . . . . . ,, . .. . . ... . ,. / - . .. . .,,. . ~- . ' . ., . .. . , . . . ,, , .. ,, .· . . ·= ' . ·• • '' ' , .-... • • • ' ----· 1' • • " , ,.. ...... -c .... A~-- -~ ,, ' .. . . .. . .. ..... .. .. . - . . -~- / / ,, . .. . . ' . . /,, ""''' . . ~.. .~ . / . " ' .· =• . ,. ) . • . . • .. " ,, ~'/ "- X ' .-··· \' l / ., .... . . .,..,, .... . ... , . ""' ' :. ,, . " ,., . . • . .. . A, ''/ ,_ ,- . 4, - -;o·,, . . . . . .. . ... ,~,,,/ '°' - .. r· ,.,.* c .. . ,d . . .. ,. , . . ., ... , "·7-~ .. .. • "' ..+- " . • _h , .. • " ,, . "- . • •• • ,0 .... .. 0 0 ' ,• /•/•/, cp c /'' ' ;;£;:' _.,. .,. --LJ -¥.. . . . . • . .· '• ,., . ' . . . / "----:::::..-,. -- - , .... ;: · • +· / • ··.. • ' • , / ., •'r1 1 1, 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,rap hic 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. \1ed ium gray, aphanitic dik e rock with phenocry sts of . sndesi11e arid hornblende as much as 1 cm long . Bostonite porphJTy . Pinkis h-bro wn, aphani ric dike roc k with abunclant p henoci:ysts of al bitc 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 ma gneti te and ilmenite. Composite unit. ,\ emi t com pr ising pr edomina ntl y schist but also abundant am ph ibo\ite and quartzi te, which impart distinctive li near magnetic anomalies of moderately high a mplitude; assoc i ated with reponc<l occurr enc es of ir on for mation and ita hir 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 tQ ,crucC=• s)'lllbols, or aT , l.t•H or lbc oe;;im,t t o ""'"' ,ne ,,,.001 app1'eo: M, ,c,..,.,6~.,,,, i, oa t o.; F, photo i nC•r~cec~CIGn) R, r<>C \ Ollletr,c data - · --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.Ci f o,,. Synfono-• o\>o· ,i oa 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 .c csl St'11!e °"" ilip of '-I• lnclio•O no,1'ont "1 Vertical. Sc dl!e &O<\ di~ or foli~ cion--ope-n ,,-001 ioili oM•• fo1'oCi an 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 Hor irnntol <•rtico.J. G <rlke ani dip of 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, lacline U ,,. 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 EXPLANATION ' 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 l k\icopter - traverse cov erage by M. R. !:\rock and A H. C hidester 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 fro m a minera ls exploration survey of the q uadrangle, 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 do ts on the geologic map ,, I I ,i, l ,).~l ~ -,ff, 41 ! I/ I. i"\i .::/ , a , -1t%!': - I · %1$; I /1 / I 11 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' s 0 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 -plan imetric me t hods from ae r ia l photograp hs taken 1968 - 69 The internat io na l bou ndary m us t not be c_ ons idered auth oritative Form lines have no c onsistent interval and show only t he general shape of terra in Geographi c grat i r:u le and re ctang ular g ri a based on Ho t ine 's Rec ti fi ed 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.• \' 'o l ,,. ., " ,,,, · /. ,., - .. . -- ..... . - .. ....... '• ... .. . . - . -- . ... . . .. ,. . "· -" " . . . . . ;,,- ,_ .. .., ' ' ><··.. . =' >.,, . ,. ' .-c:?-· ~- , .. ,,, ='' ---:~ ,,.,,.. ... /; ?.," . • • J£J~~jf:?~ Jt, ' ~:/ I 1 "' //'· I ,.. SCAL E 1 : 250 000 JO 15 l ,c ,. 15 20 25 MI LE S '" 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;L U ZORfR /'·{' .•• , I '°"'~ .I '" , •" . I - ANOK Lr M~~OVIA GBANKA ,• cilcJ:!~AN 0 '' i , C• 'L__!L_'_ ""'" .. .. '~ -~ zw~t u "·~. 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 N MENT 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 manganifer ous garnet rock) and carbonate facies (quarcz- manganese carbonate rock) . Sooty black ri nd on weathered surfaces . Iron formation. Lron - rich :;chisrn incl udin g itabirite and s ili cate-facies iron formation. Associated with composite un it {z) in sch i st bc"lt and dt!lineared on the ba sis of srrong magnetic anomalies. Iron for ma tion , silicate facies. Dark greenish-gray iron- rich grunerite - hornblende-.quanz sc hist. Iron format ion , oxide facies {ita birit e) . Mearnm to dai:k gray, finely la minated quartz-hernatite-rnllgnNite rock. Amphibolitc. Dark gr ay to da rk gree nis h- g ray, coarsely foliated roc k with approximately e qual propor<io11:; of hornbl ende and plagioclase; accessory s phene ubiquitous. Distinct layer ing reflects variations in pro p orti ons of essential and accessory miner al s, and in grain s ize. Some layers cont ai n minor amounts of qua rt z. Quartzite. Dark- to Ught-grav, medium -grained rock with quartz genera1ly i1' excess of 90 percent. Locally contains accessory garnet, m agnetit e, and pvrlte. Mica schist. Gra y, medium- to coor~e~grained quartz~ muscovite schist predominates. Sillimanite is common, staurolite and tourmaline locally conspicuous, . and garnet gene rally sparse but locally abundant. Contains numerous small lenses and ir r egular masses of pegmatite rich in coarse muscovite, and g ener ally minor but l ocally abundant intersrratified biotite schist, quartzit e, 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. Predominant ly biotiw quartz diorite with abundant imersrrarificd amphibolite and quartzite. Graph ite and g arne t common a nd locally abundan t: magnetite locally impa rts dist inct magnetic character. Moderate to strong magnetic contrasts a rc characteristic of tile unit, and small local high ra dio111etric values near the norther n border of the quadrangle suggest the presence of numerous small granite hocties. Leucocratic gne iss. A map unit distinguished on the basis of brood low magnetic conrrasts. Qu3rtZ di orite ~nciss. niotitic and hornb\cmJic quartz diovite gneiss, genc rallv wii:11 strong foliation p3rallcl to distinct laycTing that rd lc:c ts variation in con1cm of ma fi c m inerals . Bi otitic 3nd hor nblcnd ic phases loca] lv inwrbyered at outcrop sc3le. Conrnins appreciab le in ter srrat ific d amphibolite and minor amounts of s chist. Graniti c gneiss Mostly biot i te gneiss ranging from gram;Jioritc to gr an ite in composition. with minor amounts of qu::inz diorite g neiss and a1nphibolite. C onta in s zones with ahun,bnt po rph noblasts and augcn of microcline. Weakly folin1cd, commonly displ3ys stro ng joint system. Gra nodiorite gneiss. Predominantly biotitic gr3nod ior-ite' gneiss wit l1 min o r locc1l granitic bodies . Weak foliation r eflects pr cdom in:rntly tile orii.;ntation of biotite. GrJ.11itc gni.; i ss . I Jioriie gr an i te gnei:;s characterized by high raJior:ietric and low m3 gm:c ic; v3lues. • ,, + " ' " _ ,o ;.~ a <c Hor!,ontol Vert<col 5tr i.ke sod dip of plo,,., !eoc-re, dece noioed from pUCto \nt e,-,,re taeion (P) or ._.,,.,_,.,.~,, dat a ( ~)--on,, t,;o, or Chree t icks '-"'11cote g entle, n@di\a , or ot<ep dip Bear' . n,; o.nd plunge o~ ll.Jlea tlo~- - ba~bed arrow iOOloa1.e• crCol<.le axi, or lnceroootln;s foliaci.oos; SQlid are< .. 1odic,t e• 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 treaollte- actln<>llte ,.,,.,uc\a;y bet=en r odlcme·.rieol l>"• ~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---