NorthCarolinaDepartmentofEnvironmentalQuality NorthCarolinaGeologicalSurveyPolicyandInnovationGroup OpenFileReport2017-16
CONTACTSANDOTHERFEATURES
52 40 4848
7900'00" 65 7852'30" infe red
concealed faultinfe red
56 27 CZqdOMcc CZqd lineargeomorphicfeature
23 approximatesoutheasternlimitof
26
diabaseinfe red interpretedfromhilshade
19 28 40
Hycoshearzone(gradational)
Zh
LiDAR-originunknown
36
24
40 42 41
3832
45 60 4072 Strikeanddipofinclinedmainphasefoliation(SM) Strikeanddipoflatepegmatitedike
52 4835
37 25 43 44
34 48 42 30 Strikeanddipofinclinedmainphasefoliation Verticallatepegmatitedike
2036 ZMclm
45
13 (multipleobservationsatonelocation)
4 30 574542 58 36 17ZMclm 62 30 38 20 538 42 66
23
40 Verticalmainphasefoliation Strikeanddipofcleavage
50 39
7 2440
24 42 8035
35 40 27 Horizontalmainphasefoliation 70 Strikeanddipofcleavage
28
38 ZMclm 50 CZqd 75 (multipleobservationsatonelocation)
30 6029 28 18 35 CZqd 34 Strikeanddipofinclinedmainphasefoliationandlayering(SM+LYR)43 14 43
25 19 51 55 88 Strikeanddipofjoint
40 80
32 22 57 48 Strikeanddipofinclinedmainphasefoliationandlayering48
35 27 70 20 (multipleobservationsatonelocation)
34 40 31 57 45 55 69 Strikeanddipofjoint
52 67 14 Strikeanddipofinclinedlatephasefoliation(SL) 75 (multipleobservationsatonelocation)25 23 35 34 ZMclg 7542
ZMclg 26 37 30 60 43 57 57 36 19 Strikeanddipofinclinedlatephasefoliation 24 Bearingandplungeofminerallineation(LM)65 22
45 51 (multipleobservationsatonelocation)
36
52 25 2545 45 6030 56
30 35 60 Strikeanddipoffoliation(datafromT.W.Clark) Bearingandplungeofmainphasefoldaxis(FM)ZMclm Zh
23
42 71 1838 55 55
44 12 70 Strikeanddipoffoliation(datafromT.W.Clark)
43 Bearingandplungeoflatephasefoldaxis(FL)
42 38
Jd 6 30 40 (multipleobservationsatonelocation)60 77
35 31 2430 60
4220 70 70
54 60 66
45 70 Observationstationlocation Crushedstone-abandoned
24 63
42 54Jd 3039 50
Diabasestationlocation Kyanitedeposits
KennethB.Taylor,StateGeologist EXPLANATIONOFMAPSYMBOLS
3630'00" ZMclm CZrp ZMclg 67 45 55 40 50 37 49 50 72 Zh 30 56 53 2032 48 4040 25 70 80 50 70 50 75 70 222 72CGS2B Zh 312558 ZMclm Jd 47 4747 555552 405540 4957 486755 6055 6247 40 40 45 65 5560 34 70 55 64 4760 6075 5180 65 5063 44CGS 5557 451.8 35 7070 7024 Zh 80 55 85 60 59 64 60 70 8585 7083 75580 CGS1.9 7080 72 78 72 85 Za CZrp 80 86 97382 82 88 80 534258 69 8564 5380 797 78 7367 2678 7089 388667 68 83 5785 8589 87 83 59 87 2986 1443 81 6663 88 83 6378 75 88 7284 25 28 53 8444 71 748973 82 7583 18 82 766984 67 26 68 62 85 3383 72 56 73 8437 7688 76 8886 85 65 78 58 81 68 12 6584 8171 4464 83 838077 80 7777 67 708586 81 6049 7724 83 78 37 6657 70 58 63 5773 79 297377 44 8253 8120 82 42 748676 70 58 5786 53 75 8085 56 7785 74 2424 6487 13 7738 6876 3265 7877 6389 89 50 86 8377 77 76 8078 50 71 5910 97485 72 7487 567763 88 73 897874 78 6678 74 4483 82 76 10 27 6675 79 68 87 8889 75 77 53 13 7277 55 75 28 Za CZrp Za Za CZrp 68 Za 70 75 Za Zac 3630'00" Jd OMcc ZMclg ZMclm CZqd CZrp Zav Zac Za Zh G roundwatermonitoringwe llocationswithbedrockdataDukeEnergyMayoSteamElectricPlant(SynTe ra,2015) CGS 2017CarolinaG eologicalSocietyfieldtripstopwithnumber(Hibbardetal.,2017)1.8 CG S1.8-CountryLineComplex-tectonicsliversofCaswe lmafic�ultramaficsuite(Hycoarc)CG S1.9-Hycoarc-HycoFormationfelsiclithiccrystaltuffCG S2B-Hycoarc-Hager'sMountainkyaniteoccurence IN TRODUCTION ThisisacompiledgeologicmapofdatafromgeologicinvestigationsalongtheHycoShearZone.DetaileddiscussionsofthegeologicinterpretationsareprovidedinHibbard etal.(1998)andHibbardetal.(2017).AsmalportionofthemapareawasmappedbyBowman(2010)andBowmanetal.(2013)aspartofagraduatethesis.Aone-mile radiuscenteredontheG MHElectronicsSuperfundSitenearRoxboro,N CwasmappedbyT.W.ClarkundercontractwiththeUSG S(Chapmanetal.,2013).Monitoringwe lboringlocationdatafromtheComprehensiveSiteAssessmentReportfortheDukeEnergyMayoSteamElectricPlant(SynTe ra,2015)isincludedonthemap.G eologic contactsofG loverandSinha(1973)weremodifiedbasedonnewlycolectedgeologicdata.Thecrushedstone(abandoned)andkyanitedepositlocationsfromUSG SMineralResourcesDataSystem(MRDS). UN ITDESCRIPTION S Jd�Diabase:Blacktogreenish-black,fine-tomedium-grained,diabase;consistsprimarilyofplagioclase,augiteandmaycontainolivine.Occursasdikesupto100ftwide.Typicalyoccursasspheroidalyweatheredboulderswithagrayish-brownweatheringrind. MiltonTe rane�Milton-ChopawamsicArc(ca.475-450Ma) OMcc-Cunninghamcomplex:Heterogeneousmixtureofmediumtodarkgreybiotitegneissandbiotiteschistrangingfrommassive,equigranulargraniticgneisstolayers andlensesofbiotite�garnet�silimaniteschist.Themostcommonrocktypeisbiotitegneissthatrepresentsahybridbetweenthesetwoend-members,althoughdistinctiregular-shapedareasofeitherend-membercanbefound.ThegraniticgneissislocalyK-feldsparmegacrysticwithcrystalsupto50mmlong.Layering,atcentimeterto meterscale,isdefinedbyfeldsparporphyroclastconcentrationaswe lasbiotitecontent;itisgeneralysubtleinmostoftheunit,butitisaccentuatednearthecontactofthe gneisseswiththeCountryLinecomplex.Localy,meter-scalepodsofamphibolite,dioriticgneiss,andcalc-slicategneissareenvelopedinamatrixofbiotitegneiss.The granticgneissiscompositionalysimilartoandappearstogradeintotheCarboniferousKilgoreorthogneiss.Thebiotiteschistissimilarto,andappearstogradeintotheOrdovician(?)Miltonschistandparagneiss.ThusthecomplexappearstobeamixtureofOrdovicianandMississippianrocks. CarolinaTe rane TheCountryLinecomplex(ca.614�323Ma) ZMclg�Unseparatedbiotitegraniteorthogneiss:Buffweathering,mediumgrey,weaklytostronglyfoliated,mainlymediumgrainedbiotitegranite. ZMclm�NeoproterozoicmaficgneissandamphiboliteinterlayeredwithMississippianpegmatitesandorthogneiss:G reenschisttoamphibolitefaciesmaficgneisses withinterlayeredgranitoidsandgraniticpegmatites;subordinatebiotitegneissandminormetapyroxenite,semipeliticschist,andfelsicschist(She l,1996).Themaficgneisses rangefromamphibolitestobiotite-amphibolegneisses.Commonly,theyarelayeredonacentimetertometerscale,althoughinsomeplacestheyaremassive,witha medium�tocoarse-grainedgabbro-liketexture.Themaficgneissesareextensivelyinterlayeredwithgranticpegmatites,localyenvelopebrownish-grey,fine-grained granitoids,andareintrudedbycross-cuttinggranticpegmatites. N orthoftheYanceyvilegranitegneiss(YanceyvileandLeasburgquadrangles),thecomplexischaracterizedbyaveryregularlylayered(centimeter-scale),fine-tomedium-grainedgraybiotite+blackishgreenamphibolegneisswithinterlayeredgraniticgneiss(She l,1996).Localy,overthespanofafewmeters,theregularlylayeredgneiss gradesintomigmatite(sensulato)withanetworkoffoliatedcoarsegranitoidcontainingmeterscalepodsofamphibolitewithlayeringandfoliationobliquetothatinthe granitoid. BiotitegneissisaminorcomponentoftheCountryLinecomplex;typicalyitisafine-tomedium-grainedequigranular,grayquartz-feldspar-biotite+garnetgneiss.G eneralyitformsmassiveandhomogeneouslens-shapedbodiesthataretoosmaltoberesolvedat1:24,000. Zirconfromalayeredmaficgneisssub-unitintheSouthBoston,VAareahasyieldedadiscordantupperinterceptageof613.9+/-9.3Mathatisinterpretedtoreflectaprotolith ageforthemaficgneisses.Zirconandsphenefromthesamesamplehaveyieldedaconcordantageofca.323Ma(Wortmanetal.,1998).Concordantlyinterlayered pegmatitesincreaseinvolumetowardstheMississippianYanceyvileorthogneiss(YanceyvileandLeasburgquadrangles.),suggestingthattheconcordantpegmatitesarealsoMississippian.Thus,thecomplexisamixtureofN eoproterozoicandMississippianrocks. CZqd�Quartzdioriteplutons:Fine-tocoarse-grained,heterogeneouslyfoliated,biotiteand/oramphibolebearing,quartzdiorite. AlbemarleArc(ca.550-530Ma) CZrp-RoxboroPluton:Massivetolocalyveryweaklyfoliated,leucocratic(CIlessthan10),pinkish,medium-tocoarse-grained,hypidiomorphicgranular,metamorphosed granite.Maficmineralspresentinrockaremostcommonlybiotiteintergrownwithchloriteand/orhornblendeintergrownwithactinolite.PlutonmappatterntruncatesAaronFormationunitsandHycoFormationvolcanics.Wortmanetal.(2000)reportedaU-Pbageof546.5+3.0/-2.4MafortheRoxboropluton(OliveHilQuadrangle.).Boulderfields areacommongeomorphicexpressionabovetheRoxboropluton. AaronFormation(Youngestdetritalzirconsofca.578and588Ma) Zav�Virgilinavolcanics:Mafic�felsicvolcaniclasticrocksoftheVirglinamemberaretypicalyhomogenousandcoarse-tofine-grainedwithvariableamountsofquartz,feldspar,andlithicfragments(25%togreaterthan75%).DescriptionfromBowman(2010). Zac�AaronConglomerate:Thelowerclasticrockmemberconglomeratemarkerunitiscomposedmainlyofclastsofquartzite,veinquartz,andvolcanicclaststhatrangefrom2cm-15cm;localy,jasperandhematite/magnetiteclastsoccur.Theconglomerateistypicalypoorlysorted,withslightlyflattenedroundedclaststhatisclastsupportedintheuprightlimbandmatrixsupportedintheoverturnedlimboftheVirglinasyncline.DescriptionfromBowman(2010).YoungestdetritalzirconsfromAaronFormation conglomeraterangefromca.578to588Ma(Samsonetal.,2001andPolock,2010,respectively). Za�Aaronclasticsedimentaryrocks:Mostlygreyvolcanicsandstoneandsiltstone.Volcanicsandstonesarequartz-andfeldspar-rich,rangingbetween15%-40%volcaniclithicsandmoderateamountsofopaquesthatareconcentratedinlayersparaleltobedding.Sandstonesaremedium-tocoarse-grainedwithbedsthatrangeinthicknessfrom2mmto20cm.Primarystructuressuchascross-beddingandgradedbeddingarecommonlyfoundthroughouttheunit.O utcropsofsiltstonesaremassivetothinlybedded andbeddedvarietiesconsistofalternatinglightanddarkgreenishgraylaminationsthatrangefrom1to5mmthick.DescriptionfromBowman(2010). HycoArc(ca.635-610Ma) Zh-HycoFormation:Dominantlygreenschistfaciesfelsicvolcanicandvolcaniclasticrockswithsubordinateintermediateandmaficcomponents.Theformationextends alongtheeasternmarginoftheHycoshearzone.Primaryfeaturesarewe lpreservedinmostoftheHycoFormation.Themostcommonrocktypeisfelsiccrystaltuff containingabundantanhedralcrystalsofeitherquartzorplagioclaseupto3mmindiameter.Thetuffsaretypicalyinterlayeredwithfelsiclapilituffs,quartz-muscovite phylites,pebblyvolcanicconglomerate,andintermediatetomaficcrystaltuffs.TheHycoFormationrecordsfelsictointermediatemagmatismduringaca.20m.y.span startingatca.633Ma(Wortmanetal.,2000;BradleyandMiler,201). REFEREN CES: Almendinger,R.W.,Cardozo,N.C.,andFisher,D.,2013,StructuralG eologyAlgorithms:VectorsandTensors:Cambridge,England,CambridgeUniversityPress,289pp.Bowman,J.D.,2010,TheAaronFormation:EvidenceforaN ewLithotectonicUnitinCarolina,N orthCentralN orthCarolina,unpublishedM.S.thesis,N orthCarolinaStateUniversity,Raleigh,N orthCarolina,16p.Bowman,J.D.,Hibbard,J.P.,andMiler,B.V.,2013,TheVirglinasequenceredefined,northcentralN orthCarolina:inHibbard,J.andPolock,J.,Onearc,twoarcs,oldarc,newarc�theCarolinate raneincentralN orthCarolina,CarolinaG eologicalSocietyFieldTripG uidebook,p.127-138.Bradley,P.J.andMiller,B.V.,201,N ewgeologicmappingandageconstraintsintheHycoArcoftheCarolinate raneinOrangeCounty,N orthCarolina:G eologicalSocietyofAmericaAbstractswithPrograms,Vol.43,N o.2.Cardozo,N.,andAllmendinger,R.W.,2013,SphericalprojectionswithOSXStereonet:ComputersandG eosciences,v.51,no.0,p.193-205,doi:10.1016/j.cageo.2012.07.021Chapman,M.J.,Clark,T.W.,andWiliams,J.H.,2013,G eophysicalloggingandgeologicmappingdatainthevicinityoftheG MHElectronicsSuperfundsitenearRoxboro,N orthCarolina:U.S.G eologicalSurveyDataSeries762,35p.,(http:/pubs.usgs.gov/ds/762/)Glover,L.,I,andSinha,A.,1973,TheVirglinadeformation,alatePrecambriantoEarlyCambrian(?)orogeniceventinthecentralPiedmontofVirginiaandN orthCarolina:AmericanJournalofScience,v.273-A,p.234-251.Hibbard,J,Bradley,P.andShe l,G,2017,RampingthroughthePiedmont�AnoverviewofthegeologyoftheHycoShearZone,north�centralN orthCarolina,inHibbard,J.,Bradley,P.andO wens,B.,RampingthroughthePiedmont�theHycoShearZoneandassociatedrocksinN orth�centralN orthCarolina,CarolinaG eologicalSocietyFieldTripG uidebook2017.Hibbard,J.,She l,G.,Bradley,P.,Samson,S.,andWortman,G.,1998,TheHycoshearzoneinN orthCarolinaandsouthernVirginia:ImplicationsforthePiedmontZone-CarolinaZoneboundaryinthesouthernAppalachians:AmericanJournalofScience,v.298,p.85-107.Pollock,J.C.,Hibbard,J.P.,andSylvester,P.J.,2010,DepositionalandtectonicsettingoftheN eoproterozoic-earlyPaleozoicrocksoftheVirglinasequenceandAlbemarleG roup,N orthCarolina:inTolo,R.P.,Bartholomew,M.J.,Hibbard,J.P.,andKarabinos,P.M.,eds.,FromRodiniatoPangea:TheLithotectonicRecordoftheAppalachianRegion:G eologicalSocietyofAmericaMemoir206,p.739-772.Samson,S.D.,Secor,D.T.,andHamilton,M.A.,2001,WanderingCarolina:trackingexoticte raneswithdetritalzircons:G eologicalSocietyofAmericaAbstractwithPrograms,v.33,no.2,p.A-263.Shell,G.S.,1996,N atureoftheCarolinaslatebelt-MiltonbeltboundarynearYanceyvile,N orthCarolina:M.S.thesis,N orthCarolinaStateUniversity,Raleigh,N orthCarolina,96p.SynTerra,2015,ComprehensiveSiteAssessmentReport�DukeEnergyMayoSteamElectricPlant,pages912.AccessedfromN CDepartmentofEnvironmentalQuality,DivisionofWaterResourcesonlinedocumentlibraryin2017.Wortman,G.,Samson,S.,andHibbard,J.,1998,PreciseU -PbtimingconstraintsonthekinematicdevelopmentoftheHycoshearzone,southernAppalachians:AmericanJournalScience,v.298,p.108-130.Wortman,G.,Samson,S.,andHibbard,J.,2000,PreciseU-PbzirconconstraintsontheearliestmagmatichistoryoftheCarolinate rane:JournalofG eology,v.108,p.321-Equal-AreaSchmidtNetProjections andRoseDiagram PlotsandcalculationscreatedusingStereonetv.8.6.0basedonAlmendingeretal.(2013)andCardozoandAlmendinger(2013).
CZrp
3622'30" 7900'00" Za Zh Zav 3622'30" 7852'30" HIBBARD(1998) G LOVERAN DSIN(1973) HA CLARK BOWMAN(2010) EqualAreaSchmidtN etProjectionofContouredPolestoMainPhaseFoliation(SM)andLayering(LYR)[blackdots]andBearingandPlungeofMainPhaseLineations(LM)[redtriangles] ContourInterval=2sigmaMainPhaseFoliationN =194LatePhaselineationsN =14 ContoursdisplayedforSMonly EqualAreaSchmidtN etProjectionofContouredPolestoLatePhaseFoliation(SL)ContourInterval=2sigmaN=11
IN DEXTOG EOLO G ICMAPPIN G
N.C. CompiledGeologicMapoftheHycoShearZoneandAdjacentPortionsoftheClusterSpringsandRoxboro7.5-MinuteQuadrangles,PersonCounty,NorthCarolina G eologyby:JamesP.Hibbard(includesdatacolectedbyTimothyW.ClarkandJeffreyD.Bowmanand modifiedcontactsofLynnG lover,IIIandA.K.Sinha)DigitalCartographyby:BrandonT.Peach,MichaelA.Medina,RandyBechtelandPhlipJ.Bradley 2017 EqualAreaSchmidtN etProjectionof UnidirectionalRoseDiagramofJointsBearingandPlungeoflatephasefoldsaxes(FL) N=205N =9 OuterCircle=10%Meanvector=013.8��16.4� Maxvalue=15.12195%between021�and030� ThisisanO penFileMap.IthasbeenreviewedinternalyforconformitywithN orthCarolinaG eologicalSurveymappingstandardsandwiththeN orthAmericanStratigraphicCode.FurtherrevisionsorcorectionstothisOpenFile mapmayoccur. ACKN OWLEDG EMEN TS ThisresearchwassupportedbytheN ationalScienceFoundation:G rantsEAR�9219979andEAR9506363toJ.HibbardandEAR-9219583toS.Samson.
CompiledGeologicMapoftheHycoShearZonePortionsoftheClusterSpringsandRoxboro7.5-MinuteQuadrangles,OpenFileReport2017-16
