东昆仑西部野马泉地区三叠纪花岗岩成因与构造背景
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摘要
位于青海省东昆仑西部的野马泉地区三叠纪花岗岩分布广泛,本文通过花岗岩岩石学、地球化学、年代学研究,将晚古生代—早中生代造山旋回同碰撞阶段时限厘定为235~224 Ma,后碰撞时限厘定为224~204 Ma。研究表明,同碰撞阶段代表性侵入岩岩石组合为石英二长闪长岩-花岗闪长岩,具有钙碱性-高钾钙碱性系列准铝质-弱过铝质I型花岗岩的特征,岩石形成于下地壳或中下地壳,与幔源物质底侵作用和俯冲大洋物质"滞后"局部熔融有关,花岗闪长岩具有adakitic岩亲和性的特点。后碰撞阶段代表性侵入岩岩石组合为似斑状二长花岗岩-二长花岗岩-花岗斑岩,具有高钾钙碱性-钾玄岩系列准铝质-强过铝质S型花岗岩的特征,岩石形成于上地壳,含闪长质包体二长花岗岩源区具有EMⅡ富集地幔的印记,有别于不含包体的二长花岗岩。三叠纪花岗岩的形成可能经历了地幔底侵-洋壳"滞后"熔融和地壳熔融的深部过程。
As a component of continental crust, granites are very important for unraveling the formation and evolution history of ocean basin closure and continents. Triassic granite is widely distributed in the Yemaquan area of the western part of the Eastern Kunlun Mountain Range, P.R. China. The petrogenesis and tectonic setting of granite in Yemaquan area have been poorly studied. Based on the petrology, geochemistry, and geochronology of the granitoids, authors consider that the syn-collisional orogenic stage of the late Paleozoic-early Mesozoic is 235-224 Ma, and post-collisional orogenic stage is 224-204 Ma. Associated with intrusive rocks in syn-collisional orogenic stage are quartz monzodiorites-granodiorites. These rocks are classified as calc-alkaline-high K calc-alkaline series and metaluminous-weakly peraluminous I-type granite. They formed in the lower crust or mid-lower crust, related to underplating of mantle material and delayed partial melting of the subduction oceanic material. Granodiorites are similar to the adakitic intrusive rocks. Associated with the intrusive rocks in post-collisional orogenic stage are porphyritic monzogranitegranite porphyry. These rocks are classified as high K calc-alkaline-shoshonitic series and metaluminousstrongly peraluminous S-type granite. They formed in the upper crust. The granite source region of monzogranite including dioritic enclaves, has the signs of EMⅡ, different from other monzogranite. Yemaquan Triassic granite formed as the deep course of mantle underplating, "lag-type" oceanic material partial melting and crust partial melting.
As a component of continental crust, granites are very important for unraveling the formation and evolution history of ocean basin closure and continents. Triassic granite is widely distributed in the Yemaquan area of the western part of the Eastern Kunlun Mountain Range, P.R. China. The petrogenesis and tectonic setting of granite in Yemaquan area have been poorly studied. Based on the petrology, geochemistry, and geochronology of the granitoids, authors consider that the syn-collisional orogenic stage of the late Paleozoic-early Mesozoic is 235-224 Ma, and post-collisional orogenic stage is 224-204 Ma. Associated with intrusive rocks in syn-collisional orogenic stage are quartz monzodiorites-granodiorites. These rocks are classified as calc-alkaline-high K calc-alkaline series and metaluminous-weakly peraluminous I-type granite. They formed in the lower crust or mid-lower crust, related to underplating of mantle material and delayed partial melting of the subduction oceanic material. Granodiorites are similar to the adakitic intrusive rocks. Associated with the intrusive rocks in post-collisional orogenic stage are porphyritic monzogranitegranite porphyry. These rocks are classified as high K calc-alkaline-shoshonitic series and metaluminousstrongly peraluminous S-type granite. They formed in the upper crust. The granite source region of monzogranite including dioritic enclaves, has the signs of EMⅡ, different from other monzogranite. Yemaquan Triassic granite formed as the deep course of mantle underplating, "lag-type" oceanic material partial melting and crust partial melting.
引文
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[18]丰成友,王雪萍,舒晓峰,等.青海祁漫塔格虎头崖铅锌多金属矿区年代学研究及地质意义[J].吉林大学学报(地球科学版),2011,41(6):1806-1817.
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[20]张爱奎,刘光莲,丰成友,等.青海虎头崖多金属矿床地球化学特征及成矿-控矿因素研究[J].矿床地质,2013,32(1):94-108.
[21]于淼,丰成友,保广英,等.青海尕林格铁矿床矽卡岩矿物学及蚀变分带[J].矿床地质,2013,32(1):55-76.
[22]丰成友,李东生,吴正寿,等.东昆仑祁漫塔格成矿带矿床类型、时空分布及多金属成矿作用[J].西北地质,2010,43(4):10-17.
[23]李洪普,刘具仓,张喜全,等.青海省柴南缘四角羊铁多金属矿区岩浆岩特征及其成矿意义[J].地质与勘探,2011,47(6):1009-1017.
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[32]Wyllie P J,Wolf M B,Vanderlaan S R.Conditions for formation of tonalites and trondhjenites:Magmatic sources and products[A].de Wit M J,Ashwahl L D.Tectonic Evolution of Greenstone Belts[M].Oxford Univ.Press,1997,17:189-209.
[33]Martin H.Adakitic magma:modern analogues of Archean granitods[J].Lithos,1999,46:411-429.
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