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49o11' N 49o11' N

49o19' N 49o19' N

56o24' W 55o56' W

56o23' W 55o56' W

200

100

100

200

450

200

200

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229

152

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75

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7575

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7070

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7070

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4565

65

75

60

20

40

60

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60

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15

15

30

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60

60

70

70

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89

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80

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70

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8970 89

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20

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30

30

60

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55

4535

60

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2070

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20

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25

75

70

545000

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0 2 4 6km

MAP 2016-02O P EN FILE NFLD/3268

GEOLOGY OF T HE GREAT GU LL LAK E – NORT H T WIN LAK E AREA(PART S OF NT S 12H/01, NT S 12H/08, NT S 02E/04 AND NT S 02E/05), CENT RAL NEWFOU NDLAND;

ROBERT 'S ARM VOLCANIC BELT AND ADJACENT ROCK S : MAP 2 OF 3Scale 1:25 000

NEWFOUNDLAND

12G

1K1L11I

1N1M11P11O

12B 12A 2D 2C

2F2E12H

12I 2L

2M12P

47o

48o

49o

50o

58o 56o 54o

51o

54o56o58o

51o

47o

48o

49o

50o

0 150Kilometres

INDEX MAP

Geolog y by B.H . O 'Brien, P.Geo.P reliminary GIS/dig ital cartog raphy by M. Clarke (2013) and P. Desveau x (2014).Final GIS/dig ital cartog raphy by N.A. Stapleton.Geolog ical field assistance by C. P ennell (2002, 2003), B. Sparrow (2005) and J. Squ ires (2006).Lithog eochemical su pport stu dies by K. Sariog lu (2007) and D. W alsh (2008).Base map in dig ital form at pu blished at Geomatics Canada, Earth Sciences Sector, Natu ral Resou rcesCanada, O ttawa.Elevations in metres above mean sea level. Contou r Interval for NT S 12H /01 and NT S 12H /08 is 10 metres.Contou r Interval for NT S 02E/04 and NT S 02E/05 is 15 metres.U niversal T ransverse Mercator projection (U T M) Zone 21.North American Datu m (NAD) 1927.Approximate mag netic declination (2015) at centre of map 19o29' west, chang ing by 0o11' east per year.O pen File NFLD/3268Copies of this map may be obtained from the Geoscience P u blication and Inform ation Section, Geolog icalSu rvey, Department of Natu ral Resou rces, Governm ent of Newfou ndland and Labrador, P.O . Box 8700, St.John's, NL, Canada A1B 4J6 [pu b@g ov.nl.ca].Departmental website: http://www.nr.g ov.nl.ca/nr/Geolog ical Su rvey website: http://www.nr.g ov.nl.ca/nr/mines/g eoscience/reports_mapsT his map is su bject to revision and modification. Symbols for bedding and selected minor stru ctu res are notplotted directly at the exposu re location.P u blished 2016.Recom m ended Cita tionO ’Brien, B.H .2016: Geolog y of the Great Gu ll Lake – North T win Lake area (parts of NT S 12H /01, NT S 12H /08, NT S 02/04and NT S 02/05), central Newfou ndland; Robert’s Arm V olcanic Belt and Adjacent Rocks: Map 2 of 3. Scale1:25 000. Governm ent of Newfou ndland and Labrador, Department of Natu ral Resou rces, Geolog ical Su rvey,Map 2016-02, O pen File NFLD/3268.Accompanying g eolog ical notes, reference list, and the complete leg end of the map u nits comprising theRobert's Arm volcanic belt and adjacent rocks are available with this open file map.NoteO pen File reports and maps issu ed by the Geolog ical Su rvey Division of the Newfou ndland and LabradorDepartment of Natu ral Resou rces are made available for pu blic u se withou t being formally edited or peerreviewed. T hey are based u pon preliminary data and evalu ation.T he pu rchaser ag rees not to provide a dig ital reprodu ction or copy of this produ ct to a third party. Derivativeprodu cts shou ld acknowledg e the sou rce of the data.Discla im erT he Geolog ical Su rvey, a division of the Department of Natu ral Resou rces (the “au thors and pu blishers"),retain the sole rig ht to the orig inal data and information fou nd in any produ ct produ ced. T he au thors andpu blishers assu m e no leg al liability or responsibility for any alterations, chang es or misrepresentations madeby third parties with respect to these produ cts or the orig inal data. Fu rthermore, the Geolog ical Su rveyassu mes no liability with respect to dig ital reprodu ctions or copies of orig inal produ cts or for derivativeprodu cts made by third parties. P lease consu lt with the Geolog ical Su rvey in order to ensu re orig inality andcorrectness of data and/or produ cts.

56°0'

56°0'

56°5'

56°5'

56°10'

56°10'

56°15'

56°15'

56°20'

56°20'

49°25' 49°25'

49°20' 49°20'

49°15' 49°15'

49°10' 49°10'

49°5' 49°5'

Map 2 of 3

REGIONALGEOLOGY

T his inset displays reg ionalg eolog ical patterns andrelative position of maps inthis O pen File series. Seeindividu al maps for leg end.0 5

km

LEGENDAn extended leg end describing the characteristics of each of the map u nits is available with this open file map; the O pen File nu m ber is the same.

La te Middle Ordovicia nCrescent Com posite structura l tra ct (CCT )m O:CC Deer Pond division

S tra tified rock units from the Notre Da m eS ubzone of the Dunna ge Z oneREGIO NALLY MET AMO RP H O SED RO CKS(O RDO V ICIAN AND SILU RIAN EV ENT S)EARLY AND MIDDLE ORDOVICIANRobert’s Arm volcanic belt (northwest part)

Middle Ordovicia n?S outh Brook structura l tra ct (S BT )m O:Rgi Bla ck Gull Isla nd division

La te Ea rly Ordovicia nGullbridge structura l tra ct (GT )eO:R Robert’s Arm units in the Da wes Pond– Grea t Gull La ke– LoonPond a reaeO:Rph Powderhouse division

eO:Rgb Gull Brook Bridge division

RO CKS O F T H E RO BERT ’S ARM V O LCANIC BELTEARLY ORDOVICIAN– LAT E ORDOVICIANS tra tified rock units from the Mid-Ia peta n rea lmof the Dunna ge Z oneREGIO NALLY MET AMO RP H O SED RO CKS(LAT E O RDO V ICIAN–EARLY SILU RIAN ANDYO U NGER EV ENT )MIDDLE AND LAT E ORDOVICIANRobert’s Arm volcanic belt (sou theast part)La te Ordovicia n– Ea rly S iluria n?Burnt Pond structura l tra ct (BPT )lO-eS :S H S ops Hea d Com plex (in pa rt)

La te Ordovicia n a nd olderBa ker Brook structura l tra ct (BBT )lO:Brb Rocky Brook division

La te Middle Ordovicia nBa ker Brook structura l tra ct (BBT )m O:Beb Ea stern Ba ker La ke Brook division

La te Middle Ordovicia nCa ta m a ra n Brook structura l tra ct (CBT )m O:CB Joes La ke division

La te Middle Ordovicia n?Burnt Pond structura l tra ct (BPT )S ops Hea d Com plex (in pa rt)m O:BHHC Burtons Ha rbour– Herring Cove division

Middle Ordovicia n?Burnt Pond structura l tra ct (BPT )m O:BP Julies Ha rbour division

T ommys Arm Bridg e mélang elO -eS:SH m

Rocky Brook arg illitelO :Brb3

Rocky Brook wackelO :Brb2

u nseparated Rocky Brook su ccessionlO :Brbu

Eastern Baker Lake Brook metawackem O :Beb2

Eastern Baker Lake Brook metarhyolite tu ffm O :Beb1

Joes Lake basaltic and rhyolitic tu ffm O :CBv2

Joes Lake basaltic andesitem O :CBv1

Joes Lake pillowed tholeiitem O :CBv3

H erring Cove basaltm O :BH H Cv

Bu rtons H arbou r siltstonem O :BH H Cs

Ju lies H arbou r mig m atitic parag neissm O :BP pg

J u lies H arbou r hornfelsic schistm O :BP hs

Ju lies H arbou r phyllitic metatu rbiditem O :BP s

Deer P ond sandy wackem O :CCRs

Black Gu ll Island pillowed tholeiitem O :Rg i

P owderhou se tu ffaceou s wackeeO :Rphw

Gu ll Brook Bridg e tu ff and jasperiteeO :Rg b3

Gu ll Brook Bridg e pu miceou s wackeeO :Rg b2

Gu ll Brook Bridg e basaltic andesiteeO :Rg b1

S ILU RIAN?H O DGES H ILL INT RU SIV E SU IT ES :HI Post-m eta m orphic plutonic suite in the Robert’sArm volca nic belt

P O ST -MET AMO RP H IC CO V ERLAT E DEVONIAN T O LAT E MIS S IS S IPPIAN?T AILINGS P O ND SEQ U ENCEMD:T Va ria bly indura ted, terrestria l sedim enta ry stra ta

Plutonic rock units not included in theRobert’s Arm volca nic beltMID P ALEO ZO IC INT RU SIO NSU NMET AMO RP H O SED INT RU SIV E RO CKSS ILU RO-DEVONIAN?T O P SAILS P LU T O NIC SU IT ES D:S H a nd S D:T I Post-lower S pringda le Groupintrusive rocks

EARLY S ILU RIANH O DGES H ILL INT RU SIV E SU IT EeS :HI Post-m eta m orphic plutonic suite in the Robert’sArm volca nic belt

EARLY S ILU RIANT O P SAILS P LU T O NIC SU IT E (CO NT INU ED)eS :T I Post-m eta m orphic intrusive suite in the Robert’sArm volca nic belt

MET AMO RP H O SED INT RU SIV E RO CKSLAT E ORDOVICIAN– EARLY S ILU RIANS yn-m eta m orphic intrusions in schistose a nd gneissicrocks of the Robert’s Arm volca nic belt

S tra tified rock units not included inthe Robert’s Arm volca nic beltP RE-CARBO NIFERO U S T ERREST RIALO V ERST EP SEQ U ENCEREGIO NALLY MET AMO RP H O SED RO CKS(SILU RIAN O R YO U NGER EV ENT )EARLY – MIDDLE S ILU RIANSP RINGDALE GRO U P (lower part)S :S Volca nosedim enta ry ba sin fill(K ings Brook sequence)

RO CKS FO RMED IN T H E IAP ET U SO CEANS tra tified rock units from the ExploitsS ubzone of the Dunna ge Z oneREGIO NALLY MET AMO RP H O SED RO CKS(SYN-SILU RIAN EV ENT )MIDDLE ORDOVICIANW ILD BIGH T GRO U P (u pper part)m O:WP Arc-rela ted turbidites(younger Wild Bight sequence)P ennys Brook Formation (middle and u pper divisions)

P RE-MIDDLE SILU RIAN MARINEO V ERST EP SEQ U ENCESREGIO NALLY MET AMO RP H O SED RO CKS(SYN-SILU RIAN EV ENT )LAT E ORDOVICIANSH O AL ARM FO RMAT IO NlO:S A Tra nsgressive high-sta nd sedim enta ry cover(post-a rc)

T ailing s P ond polymictic cong lomerateMD:T cm

Gu ll Brook g raniteSD:T Ig bg t

Rocky P ond g raniteS:H Irpg

North T win Lake g ranodioriteS:H Itlg d

North T win Lake qu artz dioriteS:H Itlqd

Lower Gu ll P ond dioriteeS:H Ilg dr

Rocky P ond g ranodioriteeS:H Irpg d

Long P ond hornblende g abbroeS:H Ilpg b

Long P ond pyroxene g abbroeS:H Ilg b

Sou th Brook g ranodioriteeS:T Isb

Dawes P ond metag abbroeS:T Idpg b

T ower H ill felsic orthog neissO S:BP og

King s Brook rhyoliteS:SV f1

King s Brook basaltS:SV m1

King s Brook sandstoneS:SS

Gu mmy P ond shalelO :SAg

Sops Arm Brook arg illitem O :W P u

eO:Rwb West La ke Brook division

eO:Rsp S ta rkes Pond division

eO:Rdb Da wes Pond Brook division

Plutonic units coeva l with rocks ofthe Robert’s Arm volca nic beltREGIO NALLY MET AMO RP H O SEDINT RU SIV E RO CKS (SYN-O RDO V ICIANAND LAT ER EV ENT S)LAT E EARLY ORDOVICIAN?eO:F Pre-tectonic intrusions in the northwest pa rtof the Robert’s Arm volca nic belteO:FF Firetower Hill intrusive suite

eO:HH Ha ll Hill Com plex

RO CKS O F T H E EAST ERNO P H IO LIT E BELTPlutonic rock units older tha n theRobert’s Arm volca nic beltREGIO NALLY MET AMO RP H O SEDINT RU SIV E RO CKS (SYN-O RDO V ICIANAND LAT ER EV ENT S)EARLY ORDOVICIANeO:H Meta m orphosed intrusions in rocks of theEa stern ophiolite belteO:HM Ma nsfield Cove Com plex

banded metag abbroeO :H H g

g ranodiorite - tonaliteeO :H Mg

Starkes P ond rhyolite brecciaeO :Rspb

Starkes P ond banded rhyoliteeO :Rspr

W est Lake Brook hig h-alu mina basalteO :Rwb1

W est Lake Brook arc tholeiiteeO :Rwb2

W est Lake Brook basaltic andesiteeO :Rwb3

Dawes P ond Brook u nseparatedeO :Rdbu

Dawes P ond Brook rhyodacite and aqu ag ene tu ffeO :Rdb2

Dawes P ond Brook calc-alkalic pillow brecciaeO :Rdb3

Firetower H ill qu artz–feldspar porphyryeO :FFqp

S Y MBOLS

Tra nsporta tion

Conta cts

Cordierite-andalu site-mag netite isog rad . . . . ." " "

Intru sive contact, approximate . . . . . . . . . . . . .

Stratig raphic contact, approximate . . . . . . . . . .

U nconformity, approximate . . . . . . . . . . . . . . . . !! !!

U nknown road/trail . . . . . . . . . . . . . . . . . . . . . .

W inter road . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Abandoned resou rce road . . . . . . . . . . . . . . . .

Resou rce road . . . . . . . . . . . . . . . . . . . . . . . . .

U npaved pu blic road . . . . . . . . . . . . . . . . . . . .

P aved pu blic road . . . . . . . . . . . . . . . . . . . . . .

T rans Canada H ig hway . . . . . . . . . . . . . . . . . .

Limit of g eolog ical mapping . . . . . . . . . . . . . . .

Ma jor S tructuresAxia l T ra ce of Ea rly Form ed Folds

Axia l T ra ce of La te Form ed Folds

U prig ht syncline or synform; plu ng e direction indicated by sing le arrow on axial trace(variably plu ng ing to vertical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O vertu rned anticline or antiform; tick on axial trace indicates dip direction of axial su rface;plu ng e direction indicated by sing le arrow (su bhorizontal to reclined) . . . . . . . . . . . . . . . . . . . . .

O vertu rned syncline or synform; tick on axial trace indicates dip direction of axial su rface;plu ng e direction indicated by sing le arrow (su bhorizontal to reclined) . . . . . . . . . . . . . . . . . . . . .

U prig ht anticline or antiform; plu ng e direction indicated by sing le arrow on axial trace . . . . . . . .

U prig ht syncline or synform; plu ng e direction indicated by sing le arrow on axial trace . . . . . . . .

O vertu rned anticline or antiform; tick on axial trace indicates dip direction of axial su rface;plu ng e direction indicated by sing le arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O vertu rned syncline or synform; tick on axial trace indicates dip direction of axial su rface;plu ng e direction indicated by sing le arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Late stag e synform in klippe; u prig ht or steeply inclined asymmetrical;plu ng e direction indicated by m u ltiple arrows on axial trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . >

U prig ht anticline or antiform; plu ng e direction indicated by sing le arrow on axial trace(variably plu ng ing to vertical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

U prig ht syncline affecting terrestrial overstep sequ ence strata (g entle plu ng e directionindicated on axial trace) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ra ce of Ea rly Form ed Fa ults

T ra ce of La te Form ed Fa ults

T ra ce of La te S ta ge Fa ults

U prig ht anticline affecting terrestrial overstep sequ ence strata (g entle plu ng e directionindicated on axial trace) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Folded thru st fau lt (barbs drawn on hang ing wall plate; teeth indicate present directionof fau lt dip; approximate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ranscu rrent or lateral fau lt (sinistral strike-slip; approximate) . . . . . . . . . . . . . . . . . . . . . . . . . . .T ranscu rrent or lateral fau lt (dextral strike-slip; approximate) . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dextral obliqu e-slip normal fau lt (solid circle indicates dip direction; approximate) . . . . . . . . . . .

Sinistral obliqu e-slip normal fau lt (solid circle indicates dip direction; approximate) . . . . . . . . . . .

Late stag e antiform in fenster; u prig ht or steeply inclined asymmetrical;plu ng e direction indicated by m u ltiple arrows on axial trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . >

Synmetamorphic reverse fau lt associated with late form ed folds (white barbs drawn onhang ing wall plate; teeth indicate orig inal fau lt dip; approximate) . . . . . . . . . . . . . . . . . . . . . . . . .

Synmetamorphic reverse fau lt flanking fenster or klippe (transparent barbs drawn onhang ing wall plate; teeth indicate orig inal fau lt dip; approximate) . . . . . . . . . . . . . . . . . . . . . . . . .

Minor S tructures

V ein (direction of dip indicated) . . . . . . . . . . . . . . . . . . . . . . .

Dyke (direction of dip indicated) . . . . . . . . . . . . . . . . . . . . . . .

Linear shape fabric (g eneration u nknown) . . . . . . . . . . . . . . .

Fold axial su rface (g eneration u nknown) . . . . . . . . . . . . . . . .

W -fold axis (g eneration u nknown) . . . . . . . . . . . . . . . . . . . . .

M-fold axis (g eneration u nknown) . . . . . . . . . . . . . . . . . . . . .

Bedding (tops u nknown; tick for dip direction) . . . . . . . . . . . .

Bedding (tops known, overtu rned; tick for dip direction,dot for facing direction) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S a m ple S ta tions

Geochem istry

S. Swinden and P. Sacks (1986) . . . . . . . . . . . . . . . . . . . . . . .?

B. O 'Brien (2006) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .?

B. O 'Brien (2005) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .?

B. O 'Brien (2003) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .?

B. O 'Brien (2002) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .?

L. Dickson (1999) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .?

B. O 'Brien (1996) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .?

Metamorphic foliation (g eneration u nknown, 1st, 2nd) . . . . . .

Z-fold axis (g eneration u nknown, 2nd) . . . . . . . . . . . . . . . . .

S-fold axis (g eneration u nknown, 2nd) . . . . . . . . . . . . . . . . .

Geochronology

Lithog eochemistry (W hole rock) sample site . . . . . . . . . . . . . .!G

Ar-Ar (biotite, hornblende) sample site . . . . . . . . . . . . . . . . . .!G

U -P b (zircon, titanite) sample site . . . . . . . . . . . . . . . . . . . . . .!G

Mineral occu rrence (metallic) . . . . . . . . . . . . . . . . . . . . . . . . .Ï

Drill core sample site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . òW

Joint (direction of dip indicated) . . . . . . . . . . . . . . . . . . . . . . .