Q. ;J. ;C-P. - ; -O. - ;Qb. ;Ar. ; ;γδ5. Q2m. ;C2-P1t. ;P1-2s. ;P2y. ;1. ;2. 1 [25] (a) (b) - (c)(a [10] ;b [7] ) Fig.1 Schematicgeologicalmap

Size: px

Start display at page:

Download "Q. ;J. ;C-P. - ; -O. - ;Qb. ;Ar. ; ;γδ5. Q2m. ;C2-P1t. ;P1-2s. ;P2y. ;1. ;2. 1 [25] (a) (b) - (c)(a [10] ;b [7] ) Fig.1 Schematicgeologicalmap"

砧祈任
5 years ago
Views:

1 GeologicalScienceandTechnologyInformation Vol.36 No.4 Jul doi: /j.cnki.dzkq : [J] (4): : ab b ab ( )a. ;b ) : : 330~300 Ma 310 Ma U-Pb 330~300 Ma : ; ; ; ; :P :A : (2017) [1] [8] U-Pb [9] [2-3] [4] Ma [5-6] U-Pb [7] % [10] ; ( 1-a) : : : ( ) : (1993 ) : (1958 ) duyuansheng126@126.com

2 Q. ;J. ;C-P. - ; -O. - ;Qb. ;Ar. ; ;γδ5. Q2m. ;C2-P1t. ;P1-2s. ;P2y. ;1. ;2. 1 [25] (a) (b) - (c)(a [10] ;b [7] ) Fig.1 Schematicgeologicalmapofthestudyarea (a)geotectonic locationofthestudyarea(b)andgeologicalsectionoftaip- ing Mount-Daliyan Mount(c) [11-13] 20m ( 1-bc) 1.2 ( 2-a) ( 2-b) 70% ( 2-c) ( 2-d) ( 2-gh) + ( 2-a) ( 2-ef) [16] 2 [14-16] [17-19] ; [ ] ZK-C1 ZK-S2 ZK-C1 ;ZK- 324 S2 ~300 Ma [22] 0.280mm(60 ) ( 1-a) (CL) [23-24] U-Pb ( ) LA-MC-ICP-MS 32 μm 80Hz 91500( 1064 Ma) NIST Si [8] Icpdatacal8.4 [26-27] Isoplot3.0 [28] [24]

ｉｔｈｏｆａｃｉｅｓｐｈｏｔｏｓｏｆｓａｎｈａｏｃｏｎｇｌｏｍｅｒａｔｅ３测试结果类型 ① 显著的振荡环带结构图３ａｅ ② 内部均一的单颗粒无明显的结构图３ｆｇ ③ 具备３１锆石形貌根据锆石的内

3 第４期马千里等北京周口店三好砾岩的时代物源背景及其古地理意义来自沉积学和碎屑锆石年代学的证据３１ａ部分砾石表面具有氧化圈ｂ三好砾岩表面褐红色的氧化色富含铁质ｃ磨圆排布较好的石英岩砾石ｄ砾石中具有沉积韵律层ｅ砾岩顶部夹变质砂岩夹层ｆ砂岩夹层具有平行层理特征ｇ正交偏光镜下砾石微观特征ｈ正交偏光镜下熔蚀变形的单晶石英以及针状的绢云母Ｃｈｌ硬绿泥石Ｑ石英Ｓｅ绢云母图２三好砾岩的典型岩相照片Ｆｉｇ２Ｔｙｐｉｃａｌｌｉｔｈｏｆａｃｉｅｓｐｈｏｔｏｓｏｆｓａｎｈａｏｃｏｎｇｌｏｍｅｒａｔｅ３测试结果类型 ① 显著的振荡环带结构图３ａｅ ② 内部均一的单颗粒无明显的结构图３ｆｇ ③ 具备３１锆石形貌根据锆石的内部特征可以将其分为以下４个明显的环带结构遭受了后期的重结晶改造具备核幔边结构指示复杂的生长历史核部具有振图３代表性锆石阴极发光图像Ｆｉｇ３ＣＬｉｍａｇｅｓｏｆｒｅｐｒｅｓｅｎｔａｔｉｖｅｚｉｒｃｏｎｓ

4 ( 3-h~i) 4 12 ( 3-j k) 3.2 ~300 Ma 70 ;2461~406 Ma 3 ;32.1 Ga 1 331~300 Ma ZK-C1 74 ZK-S2 67 ( 90% ) (graphicagepeak) (311±2)Ma 1000 Ma (300±3)Ma( 3-b) 207 Pb 206 Pb ZK-S2 50~100μm 1000 Ma 207 Pb 206 Pb ; 1000 Ma 207 Pb 206 Pb Pb U ( 4-a): ( 4- b):1335~301 Ma34 ;2463~355 Ma8 ;3 206 Pb 238 U 2611~568 Ma25 335~301 Ma ZK-C1 100~250μm (314±5)Ma Th/U (301±2)Ma Fig.4 4 U-PbagefrequencyhistogramsofzirconsamplesfromSanhaoconglomeratewesternBeijing 4 [35] ±8)Ma; (304±6)Ma 4.1 (300±3)Ma [29-31] Dickinson [32] - Yang [33] [19] [36] 70 (331~300Ma) 34 (335~301Ma) U-Pb - Yang [33] [34] Pb/ 238 U (304±4)Ma; [34] 6 (298

4 : : 33 4.2 Yang [33] ( ) U-Pb Hf : - 4.

5 4 : : Yang [33] ( ) U-Pb Hf : ( ) U-Pb (331~300 Ma 311 Ma) [46] [47] 330~300 Ma [1322] [ ] ( 5) [39] [44] [40] [41] [39] - [16] [19] ( 5) - 360~312 Ma [48] ; 312~296 Ma [ ] [42] - - [33] [35] [45] 330~300 Ma 360~ 330 Ma 330~300 Ma 5 ( [2042] ) Fig.5 Distributionofbasin-marginconglomerateintheLatecarboniferousNorthChina

6 ; [15] Hf [16] [J] (2): [13] [17] 20029(3): ~300 Ma 5 Research200712(1): ~300 Ma : [1] CherniakDJWatsonEB.Pbdifusioninzircon[J].Chemical Geology (1):5-24. [2] CawoodPANemchinA AFreeman Metal.Linkingsource andsedimentarybasin:detritalzirconrecordofsedimentflux alonga modernriversystem andimplicationsforprovenance studies[j].earthandplanetaryscienceleters (1): [3] CawoodPAHawkesworthCJDhuimeB.Detritalzirconre- [26]LiuYSHuZ CGaoSetal.Insituanalysisofmajorand cordandtectonicseting[j].geology201240(10): traceelementsofanhydrousmineralsbyla-icp-mswithout [4]. U-Pb applyinganinternalstandard[j].chemicalgeology [J] (16): (1): [5] NajmanY.Thedetritalrecordoforogenesis:Areviewofap- [27]LiuYSHuZCZongK Qetal.Reappraisementandrefine- proachesandtechniquesusedinthe Himalayansedimentary mentofzirconu-pbisotopeandtraceelementanalysesbyla- basins[j].earth-sciencereviews200674(1):1-72. ICP-MS[J].Chinese Science Buletin201055(15):1535- [6] GarzantiEDoglioniCVezzoliGetal.Orogenicbeltsandoro- genicsedimentprovenance[j].thejournalofgeology (3): [7]. gycenter.specialpublication2003. [M]. : [29]GeslinJKLinkPKFanningC M.High-precisionprovenance [8]. [M]. : determinationusing detrital-zircon agesand petrography of QuaternarysandsontheeasternSnakeRiverPlainIdaho[J]. [9]. [M]. : Geology199927(4): [10]. [M]. : U/PbagesofdetritalzirconsfromthePerthBasinWestern Australia[J].SedimentaryGeology (3): [11]. [31]FedoC MSircombeK NRainbirdR H.Detritalzirconanaly- [M]. : [12]Xiao WWindleyBFHaoJetal.Accretionleadingtocoli- sionandthepermiansolonkersutureinnermongoliachina: TerminationofthecentralAsianorogenicbelt[J].Tectonics (6): [J] (2): [J]. [18]ShuanhongZYueZBiaoS.Hornblendetherobarometryof thecarboniferousgranitoidsfrom theinner MongoliaPaleo upliftimplicationsforthegeotectonicevolutionofthenorthern marginofnorth Chinablock[J].MineralogyandPetrology (1/2): [19]. [J] (10): [20]ZhangS HZhaoYSongBetal.ZirconSHRIMP U-Pband in-situlu-hfisotopeanalysesofatuffrom westernbeijing: Evidencefor missinglatepaleozoicarcvolcanoeruptionsat thenorthern marginofthenorthchinablock[j].gondwana [21]. [J] (4): [22]. - [J] (6): [23]. [J] (3): [24]. [J] (1): [25]. [M]. 2. : [28]LudwigK R.User smanualforisoplot3.0:agechronological toolkitformicrosoftexcel[m].[s.l.]:berkeleygeochronolo- [30]CawoodPANemchinA A.Provenancerecordofariftbasin: sisofthesedimentaryrecord[j].reviewsin Mineralogyand Geochemistry200353(1): [32]Dickinson W RGehrelsG E.UseofU-Pbagesofdetritalzir- constoinfermaximum depositionalagesofstrata:atesta- gainsta Colorado Plateau Mesozoicdatabase[J].Earthand [13]. - PlanetaryScienceLeters (1): [D]. : [33]YangJHWuF YShaoJAetal.Constraintsonthetiming [14]. [J]. ofupliftoftheyanshanfoldandthrustbeltnorthchina[j] (2): EarthandPlanetaryScienceLeters (3):

7 4 : : 35 [34]. [J] (2): [J] (3): [35]. : [43]. - U-Pb [J] (1):8-14. Hf [J] (5): [39]. - [47]Folo M F.Conglomeratesascluestothesedimentaryandtec- [J] (10):1485- tonicevolutionofasuspectterrane:walowamountainsore- [36]. [J] (3):625- U-Pb [J] (2): [37]. :GOSEN [J] (9): [J] (1): [38]. [46] [M]. : [J] (3): [42]. [M]. : [44]. - [45]. gon[j].geologicalsocietyofamericabuletin (12): [40] [J] (4): [48]CopeT D.SedimentaryevolutionoftheYanshanfold-thrust [41]. beltnortheastchina[d].[s.l.]:stanforduniversity2003. ZirconU-PbChronologyandProvenanceofthe SanhaoConglomerateinZhoukoudianBeijing: ImplicationsforCoevalPaleogeography MaQianli ab XuXinran b DuYuansheng ab (a.statekeylaboratoryofbiogeologyandenvironmentalgeology; b.schoolofearthscienceschinauniversityofgeosciences(wuhan)wuhan430074china) Abstract:ThispaperreportsinsituU-PbdatingondetritalzirconsfromthebasalconglomerateofUpper CarboniferousinBeijing whichconstrainstheevolutionandpaleogeographyofthenorthernpartofthe NorthChinaCraton(NCC)theInnerMongoliaPaleo-Uplift.Isotopicdatingresultsfromtheconglomer- ateandinterbeddedsandstonerevealasignificantconcentrationaround310 Ma.Furthermorethemini- mumsinglegrainrepresents(300±3)ma.thestratigraphicdistributionsuggestthatthebasalconglom- erateabovetheunconformitysurfaceofthe Middle Ordovicianshouldhavebeendepositedbetweenthe LateCarboniferousandtheEarlyPermian.Beyondthatthereisagoodcoherencebetweentheagesof NeoarcheanandPaleoproterozoiczirconsandcoevaltectonothermaleventsdistribution.SomePhanerozoic zirconshavesimilargeochemicalcharacteristicstothoseoftheigneouszirconsfromintrusiverocksac- quiredfromthenccindicatingthesourceoftheconglomeratewaslocalyderived.asignificantconcen- trationofthelatecarboniferouszirconimpliesaconnectionbetween magmatismandasharpupliftinge- ventofinnermongolia.inthiscasetheupliftingprocessshouldhaveoccurredduring Ma.Ina broadersensethebasalconglomerateofuppercarboniferousprovidesimplicationsforcalibratingtheba- sin-mountainboundarynearinnermongoliapaleo-upliftandcertainreferencetothepalaeogeographyre- construction. Keywords:ZhoukoudianBeijing;Sanhaoconglomerate;provenanceanalysis;Inner MongoliaPaleo-Up- lift;detritalzircon

An,,,,, 2, w(na 2O), w(cao),(ca B+Na B ) 1.34(B ),Na B<0.67,,, 1mm, ( 5-a) 1 Table1 Compositionandcalculationresultofplagioclaseinthequa

An,,,,, 2, w(na 2O), w(cao),(ca B+Na B ) 1.34(B ),Na B<0.67,,, 1mm, ( 5-a) 1 Table1 Compositionandcalculationresultofplagioclaseinthequa 1 : - - U-Pb 35 3 (CL) Fig.3 Cathodoluminescence(CL)imagesofzircongrainsfromtheJitoupluton 1600, : 15kV, 7 10-8 A, 1μm, ZAF Isoplot/Ex ver3 [9] [7] Fe 2+ Fe 3+ 2.2.2 U-Pb 3.1, 3.1.1, 150, ( 2-a,b),,, 0.5~2mm