内蒙古狼山地区晚志留世石英闪长岩的发现及其地质意义
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摘要
内蒙古狼山山脉西侧分布零星的早古生代岩浆岩,晚志留世石英闪长岩主要出露于哈日音熬瑞一带。该岩体岩性为石英闪长岩,块状构造,LA-ICP-MS锆石U-Pb年龄显示,其~(206)Pb/~(238)U年龄加权平均值为419.0±4.0~413.3±1.8Ma。岩石暗色矿物为黑云母,富铁(4.27%~4.65%)、富钠(4.17%~4.45%),富集大离子亲石元素Sr、K、Pb,不同程度亏损高场强元素P、Ti、Nb,轻稀土元素富集,重稀土元素亏损,弱负Eu异常,这些特征与弧岩浆岩的地球化学特征相似;La/Ba-La/Nb图解显示俯冲交代地幔的源区特点;岩石负的ε_(Hf)(t)值(-12.1~-8.8)及较大的T_(DM2)值(1981~2362Ma)反映了古元古代古老地壳熔融的特点。花岗岩类构造判别图解及区域地质资料显示岩体形成于弧陆拼贴的构造背景。对比白乃庙地区新发现的晚志留世弧陆拼贴的石英闪长岩,两者的岩石地球化学特征及同位素特征基本一致,因此,华北地块北缘晚志留世弧陆拼贴作用向西延伸至狼山地区。
The Early Paleozoic magmatites are sporadically distributed in the west of Langshan Mountain of Inner Mongolia, whereas the Late Silurian quartz diorite is mainly exposed in the zone of Hariyinaorui. LA-ICP-MS zircon U-Pb dating shows that the weighted average ~(206) Pb/~(238)U age of quartz diorite is 419.0±4.0~413.3±1.8 Ma. The characteristics of quartz diorite mainly exhibit that the biotite is the main dark mineral, which is characterized by enrichment of TFeO(4.27% ~4.65%) and Na2 O(4.17% ~4.45%),enrichment of LILE(Sr, K, Pb), depletion of P, Ti and Nb, enrichment of LREE, and depletion of HREE with weak negative Eu anomaly, similar to the characteristics of arc magmatite. La/Ba-La/Nb determinant diagram shows the characteristics of metasomatic mantle, and isotopic characteristics reflect the characteristics of melting of ancient continental crust which has an obvious negativeεHf(t) value(-12.1~-8.8) and older T_(DM2) value(1981~2362 Ma). Tectonic discrimination diagrams and regional geological data show the pluton probably formed the tectonic setting of arc-continent collision. A comparative study of recently published relevant data of Late Silurian quartz diorite in the Bainaimiao area shows that the geochemical characteristics are basically the same, and, therefore,arc-continent collision of Late Silurian extended westward to Langshan area on the northern margin of North China Craton.
The Early Paleozoic magmatites are sporadically distributed in the west of Langshan Mountain of Inner Mongolia, whereas the Late Silurian quartz diorite is mainly exposed in the zone of Hariyinaorui. LA-ICP-MS zircon U-Pb dating shows that the weighted average ~(206) Pb/~(238)U age of quartz diorite is 419.0±4.0~413.3±1.8 Ma. The characteristics of quartz diorite mainly exhibit that the biotite is the main dark mineral, which is characterized by enrichment of TFeO(4.27% ~4.65%) and Na2 O(4.17% ~4.45%),enrichment of LILE(Sr, K, Pb), depletion of P, Ti and Nb, enrichment of LREE, and depletion of HREE with weak negative Eu anomaly, similar to the characteristics of arc magmatite. La/Ba-La/Nb determinant diagram shows the characteristics of metasomatic mantle, and isotopic characteristics reflect the characteristics of melting of ancient continental crust which has an obvious negativeεHf(t) value(-12.1~-8.8) and older T_(DM2) value(1981~2362 Ma). Tectonic discrimination diagrams and regional geological data show the pluton probably formed the tectonic setting of arc-continent collision. A comparative study of recently published relevant data of Late Silurian quartz diorite in the Bainaimiao area shows that the geochemical characteristics are basically the same, and, therefore,arc-continent collision of Late Silurian extended westward to Langshan area on the northern margin of North China Craton.
引文
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[2]Han B F,He G Q, Wang X C, et al. Late Carboniferous collision between the Tarim and Kazakhstan-Yili terranes in the western segment of the South Tian Shan Orogen, Central Asia,and implications for the Northern Xinjiang, western China[J]. EarthSci. Rev., 2011, 109:74-93.
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[4]Xu B, Charvet J, Chen Y, et al. Middle Paleozoic convergent orogenic belts in western Inner Mongolia(China):framework,kinematics, geochronology and implications for tectonic evolution of the Central Asian Orogenic Belt[J]. Gondwana Res., 2013, 23:1342-1364.
[5]Zhang X H, Gao Y L, Wang Z J, et al. Carboniferous appinitic intrusions from the northern North China craton:geochemistry,petrogenesis and tectonic implications[J]. J. Geol. Soc., Lond., 2012,169:337-351.
[6]Coleman R G. Continental growth of Northwest China[J].Tectonics, 1989, 8(3):621-635.
[7]Windley B F, Allen M B, Zhang C, et al. Paleozoic accretion and Cenozoic redeformation of the Chinese Tien Shan range, Central Asia[J]. Geology, 1990, 18(2):128-131.
[8]Allen M B, Windley B F, Zhang C. Palaeozoic collisional tectonics and magmatism of the Chinese Tien Shan, Central Asia[J].Tectonophysics,1992, 220(1/4):89-115.
[9]Allen M B, Engor A M C, Natalin B A. Junggar, Turfan and Alakol basins as Late Permian to Early Triassic extensional structures in a sinistral shear zone in the Altaid orogenic collage, Central Asia[J]. J.Geol. Soc., Lond., 1995, 152(2):32-338.
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[12]Jahn B M, Griffin W L, Windley B F. Continental growth in the Phanerozoic:Evidence from Central Asia[J]. Tectonophysics, 2000,328(1):vii-x.
[13]Xiao W J, Zhang L C, Qin K Z, et al. Paleozoic accretionary and collisional tectonics of the eastern Tianshan(CHINA):Implications for the continental growth of Central Asia[J]. American Journal of Science, 2004, 304(4):370-395.
[14]Xiao W J, Han C, Yuan C, et al. Middle Cambrian to Permian subduction-related accretionary orogenesis of northern Xinjiang,NW China:Implications for the tectonic evolution of Central Asia[J].Journal of Asian Earth Sciences, 2008, 32(2/4):102-117.
[15]Xiao W J, Windley B F, Huang B C, et al. End-Permian to midTriassic termination of the accretionary processes of the southern Altaids:implications for the geodynamic evolution, Phanerozoic continental growth, and metallogeny of Central Asia[J].International Journal of Earth Sciences, 2009, 98(6):1189-1217.
[16]Wang Z Z, Han B F, Feng L X, et al. Geochronology,geochemistry and origins of the Paleozoic-Triassic plutons in the Langshan area, western Inner Mongolia, China[J]. Journal of Asian Earth Sciences, 2015, 97:337-351.
[17]Zhang S H, Zhao Y, Song B, et al. Carboniferous granitic plutons from the northern margin of the North China block:implications for a late Paleozoic active continental margin[J]. J. Geol. Soc.,Lond., 2007, 164:451-463.
[18]Zhang S H, ZhaoY, Song B, et al. Contrasting Late Carboniferous and Late Permian-Middle Triassic intrusive suites from the northern margin of the North China craton:geochronology,petrogenesis, and tectonic implications[J]. Geol. Soc. Am. Bull.,2009, 121:181-200.
[19]Zhang S H, Zhao Y, Kr?ner A, et al. Early Permain plutons from the northern North China Block:constraints on continental arc evolution and convergent margin magmatism related to the Central Asian Orogenic Belt[J]. Int. J. Earth Sci., 2009, 98:1441-1467.
[20]Zhang X H, Wilde S, Zhang H F, et al. Early Permian high-K calc-alkaline volcanic rocks from NW Inner Mongolia, North China:geochemistry, origin and tectonic implications[J]. J. Geol.Soc., Lond., 2011, 168:525-543.
[21]Zhang X H, Mao Q, Zhang H F, et al. Mafic and felsic magma interaction during the construction of high-K calc-alkaline plutons within a metacratonic passive margin:the Early Permian Guyang batholith from the northern Northern China Craton[J].Lithos, 2011, 125:569-591.
[22]周志广,张华锋,刘还林,等,内蒙中部四子王旗地区基性侵入岩锆石定年及其意义[J].岩石学报, 2009, 25(6):1519-1528.
[23]罗红玲,吴泰然,赵磊,华北板块北缘乌梁斯太A型花岗岩体锆石SHRIMP U-Pb定年及构造意义[J].岩石学报, 2009,(3):515-526.
[24]吴亚飞,曾键年,曹建劲,等.内蒙古东升庙海西期岩体锆石UPb年龄[J].地质科技情报, 2013, 32(6):23-30.
[25]Feng J Y, Xiao W J, Windley B, et al. Field geology,geochronology and geochemistry of mafic-ultramafic rocks from Alxa, China:implications for Late Permian accretionary tectonics in the southern Altaids[J]. Journal of Asian Earth Sciences, 2013, 78:114-142.
[26]刘敦一,简平,张旗,等.内蒙古图林凯蛇绿岩中埃达克岩SHRIMP测年:早古生代洋壳消减的证据[J].地质学报, 2003, 77(3):317-327.
[27]许立权,邓晋福,陈志勇,等.内蒙古达茂旗北部奥陶纪埃达克岩类的识别及其意义[J].现代地质, 2003, 17(4):428-434.
[28]许立权,陶继雄.内蒙古达茂旗北部奥陶纪花岗岩类特征及其构造意义[J].华南地质与矿产, 2003,(1):17-22.
[29]Jian P, Liu D, Kr?ner A, et al. Time scale of an early to midPaleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt, Inner Mongolia of China:implications for continental growth[J].Lithos, 2008, 101:233-259.
[30]张维,简平.内蒙古达茂旗北部早古生代花岗岩类SHRIMP UPb年代学[J].地质学报, 2008, 82(6):778-787.
[31]范宏瑞,胡芳芳,杨奎锋.内蒙古白云鄂博地区晚古生代闪长质-花岗质岩石年代学框架及其地质意义[J].岩石学报, 2009,25(11):2933-2938.
[32]李建锋,张志诚,韩宝福.内蒙古达茂旗北部闪长岩锆石SHRIMP U-Pb、角闪石40Ar/39Ar年代学及其地质意义[J].岩石矿物学杂志, 2010, 29(6):732-740.
[33]冯丽霞,张志诚,韩宝福,等.内蒙古达茂旗花岗岩类LA-ICPMS锆石U-Pb年龄及其地质意义[J].地质通报,2013, 32(11):1737-1748.
[34]Zhang W, Jian P, Kr?ner A, et al. Magmatic and metamorphic development of an early to mid-Paleozoic continental margin arc in the southernmost Central Asian Orogenic Belt, Inner Mongolia,China[J]. Journal of Asian Earth Sciences, 2013, 72:63-74.
[35]Wu T R, He G Q, Zhang C. On Paleozoic tectonics in the Alxa region, Inner Mongolia, China[J]. Acta Geol, Sin., 1998, 72:256-263.
[36]李怀坤,耿建珍,郝爽,等.用激光烧灼多接收器等离子体质谱仪(LA-MC-ICPMS)测定锆石U-Pb同位素年龄的研究[J].矿物岩石地球化学通报, 2009, 28(增刊):77.
[37]Liu Y S, Gao S, Hu Z C. Continental and oceanic crust recyclinginduced melt-peridotite interactions in the Trans-North of mantle xenoliths[J]. Journal of Petrology, 2010, 51:537-571.
[38]Ludwig K R. Users manual for Isoplot 3.0:A geochronological toolkit for Microsoft Exccel[J]. Berkeley:Berkeley Geochronology Center, California, 2003:1-39.
[39]Griffin W L, Wang X, Jackson S E, et al. Zircon chemistry and magma mixing, SE China:In situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes[J]. Lithos, 2002, 61:237-269.
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