36 4 2017 7 GeologicalScienceandTechnologyInformation Vol.36 No.4 Jul. 2017 doi:10.19509/j.cnki.dzkq.2017.0404. : [J]. 201736(4):29-35. : ab b ab ( )a. ;b. 430074) : : 330~300 Ma 310 Ma U-Pb 330~300 Ma : ; ; ; ; :P588.21 :A :1000-7849(2017)04-0029-07 [1] [8] U-Pb [9] [2-3] [4] - 140 Ma [5-6] U-Pb [7] 1 1.1 - - 80% [10] ; ( 1-a) :2016-05-27 : : (201510491012) : (1993 ) E-mail:mavictor13 @126.com : (1958 ) E-mail:duyuansheng126@126.com
30 2017 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] ; [121820-21] 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) NIST610 29 Si [8] Icpdatacal8.4 [26-27] Isoplot3.0 [28] [24]
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 ３１ ａ 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 Ｃｈ ｌ 硬绿泥石 Ｑ 石英 Ｓｅ 绢云母 图 ２ 三好砾岩的典型岩相照片 Ｆｉｇ ２ Ｔｙｐｉｃａｌｌ ｉｔｈｏｆａｃｉｅｓｐｈｏｔｏｓｏｆｓａｎｈａｏｃｏｎｇｌｏｍｅｒａｔｅ ３ 测试结果 类型 ① 显著的振荡 环 带 结 构 图 ３ ａ ｅ ② 内 部 均一 的 单 颗 粒 无 明 显 的 结 构 图 ３ ｆ ｇ ③ 具 备 ３ １ 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 Ｆｉｇ ３ ＣＬｉｍａｇｅｓｏｆｒｅｐｒｅｓｅｎｔａｔｉｖｅｚｉｒｃｏｎｓ
32 2017 ( 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 0.4 3 ( 4-a):1331 4 ( 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] - 206 Pb/ 238 U (304±4)Ma; [34] 6 (298
4 : : 33 4.2 Yang [33] ( ) U-Pb Hf : - 4.3 ( ) U-Pb (331~300 Ma 311 Ma) [46] [47] 330~300 Ma [1322] [1137-38] ( 5) [39] [44] [40] [41] [39] - [16] [19] ( 5) - 360~312 Ma [48] ; 312~296 Ma [3943-44] [42] - - [33] [35] [45] 330~300 Ma 360~ 330 Ma 330~300 Ma 5 ( [2042] ) Fig.5 Distributionofbasin-marginconglomerateintheLatecarboniferousNorthChina
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4 : : 35 [34]. [J]. 200018(2):253-258. [J]. 201441(3):728-740. [35]. : [43]. - U-Pb [J]. 200120(1):8-14. Hf [J]. 200954(5):632-640. [39]. - [47]Folo M F.Conglomeratesascluestothesedimentaryandtec- [J]. 201130(10):1485- tonicevolutionofasuspectterrane:walowamountainsore- [36]. [J]. 200723(3):625- U-Pb [J]. 638. 201488(2):185-197. [37]. :GOSEN [J]. 201286(9): [J]. 19962(1):83-91. 1396-1406. [38]. [46] [M]. : [J]. 199917(3):473-477. 1954. 1500. [42]. [M]. : 1985. [44]. - [45]. gon[j].geologicalsocietyofamericabuletin1992104(12): [40]. 1561-1576. [J]. 200175(4):562-569. [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.inthiscasetheupliftingprocessshouldhaveoccurredduring330-300 Ma.Ina broadersensethebasalconglomerateofuppercarboniferousprovidesimplicationsforcalibratingtheba- sin-mountainboundarynearinnermongoliapaleo-upliftandcertainreferencetothepalaeogeographyre- construction. Keywords:ZhoukoudianBeijing;Sanhaoconglomerate;provenanceanalysis;Inner MongoliaPaleo-Up- lift;detritalzircon