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吉林白城岭下地区花岗质糜棱岩锆石U- Pb年代学与地球化学特征对松辽盆地西缘晚古生代以来的俯冲背景的制约
投稿时间:2018-03-15  修订日期:2018-07-05  点此下载全文
引用本文:汪岩,钱程,马永非,庞雪娇,付俊彧,秦涛,杨晓平,杨雅军,钟辉,刘桂香.2019.吉林白城岭下地区花岗质糜棱岩锆石U- Pb年代学与地球化学特征对松辽盆地西缘晚古生代以来的俯冲背景的制约[J].地质学报,93(1):117-137.
WANG Yan,QIAN Cheng,MANG Yongfei,PANG Xuejiao,FU Junyu,QIN Tao,YANG Xiaoping,YANG Yajun,ZHONG Hui,LIU Guixiang.2019.Geochronologic and geochemistric evidence of granitic mylonites from Lingxia area of Baicheng City, Jinlin, constraints on subduction in the western of the Songliao basin since the Late Paleozoic[J].Acta Geologica Sinica,93(1):117-137.
DOI:10.19762/j.cnki.dizhixuebao.2019006
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作者单位E-mail
汪岩 中国地质调查局沈阳地质调查中心,沈阳,110034 wy68413@163.com 
钱程 中国地质调查局沈阳地质调查中心,沈阳,110034 qch1985123@163.com 
马永非 中国地质调查局沈阳地质调查中心,沈阳,110034  
庞雪娇 中国地质调查局沈阳地质调查中心,沈阳,110034  
付俊彧 中国地质调查局沈阳地质调查中心,沈阳,110034  
秦涛 中国地质调查局沈阳地质调查中心,沈阳,110034  
杨晓平 中国地质调查局沈阳地质调查中心,沈阳,110034  
杨雅军 中国地质调查局沈阳地质调查中心,沈阳,110034  
钟辉 中国地质调查局沈阳地质调查中心,沈阳,110034  
刘桂香 中国地质调查局沈阳地质调查中心,沈阳,110034  
基金项目:本文为中国地质调查局项目(DD20160048 01、DD20160048 16、DD20160048 03、DD20160345 17、121201207000171401)联合资助的成果。
中文摘要:东北地区古生代经历了古亚洲构造域演化,中生代经历了蒙古-鄂霍茨克构造域向西太平洋构造域的转换,这期间形成了不同期次的岩浆活动。本文对松辽盆地西缘吉林省白城市岭下地区的花岗质糜棱岩首次进行了锆石LA- ICP- MS U- Pb年代学和岩石地球化学研究,确定其侵位时代、岩石成因,从而揭示区域构造背景及转换机制。岭下地区花岗质糜棱岩中的锆石多呈半自形-自形,振荡生长环带明显,暗示其岩浆成因。测年结果显示,花岗质糜棱岩原岩形成于281.9±7.4Ma和296.2±2.7Ma,为早二叠世岩浆事件的产物。岩石具有高硅(SiO2=64.10%~75.98%)、富铝(Al2O3=11.22%~16.00%)、贫铁(Fe2O3多介于0.23%~0.85%)等特征,在地球化学上属于准铝质-过铝质(A/CNK=0.97~1.19)系列。岭下地区花岗质糜棱岩相对富集轻稀土元素(LREE)和大离子亲石元素(LILE),亏损重稀土元素(HREE)和高场强元素(HFSE)。上述特征表明,岭下地区花岗质糜棱岩的岩浆起源于高温高压下加厚陆壳物质脱水的部分熔融。结合区域地质特征,岭下地区早二叠世花岗质糜棱岩的侵位应与古亚洲洋闭合过程中的弧后拉张体制有关;花岗质糜棱岩的变质岩浆热事件年龄(157~153Ma)与蒙古-鄂霍茨克洋的挤压闭合事件有关;而花岗质糜棱岩的主变形时代(137~117Ma)为早垩世早中期,其限定了西太平洋伊泽奈崎板块向欧亚大陆的斜向俯冲的起始时间。
中文关键词:古亚洲构造域  蒙古-鄂霍茨克构造域  西太平洋构造域  花岗质糜棱岩  锆石U- Pb年代学  地球化学  岭下  松辽盆地西缘
 
Geochronologic and geochemistric evidence of granitic mylonites from Lingxia area of Baicheng City, Jinlin, constraints on subduction in the western of the Songliao basin since the Late Paleozoic
NameInstitution
WANG YanShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
QIAN ChengShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
MANG YongfeiShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
PANG XuejiaoShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
FU JunyuShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
QIN TaoShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
YANG XiaopingShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
YANG YajunShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
ZHONG HuiShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
LIU GuixiangShenyang Center of Geological Survey, China Geological Survey, Shenyang, 110034
Abstract:The Paleozoic era experienced the evolution of Paleo- Asian tectonic regime in the Northeast China, the Mesozoic experienced the transition from Mongol- Okhotsk to Western Pacific tectonic regime, in this period forming different temporal magmatic activities. Zircon U- Pb dating and whole- rock geochemical analyses are undertaken for the granitic mylonites in Lingxia area, Baicheng city of Jilin province, the western of the Songliao Basin, with the aim of constraining its emplacement time, petrogenesis and the regional tectonic setting. Zircons from the granitic mylonites in Lingxia area are euhedral- subhedral in shape, and display fine- scale oscillatory growth zoning, indicating a magmatic origin. LA- ICP- MS zircon U- Pb dating indicates that the country rock of granitic mylonites formed in the Early Permain (281.9±7.4Ma and 296.2±2.7Ma). The granitic mylonites have SiO2=64.10%~75.98%, Al2O3=11.22%~16.00%, Fe2O3=0.23%~0.85%, and belong chemically to metaluminous- peraluminous series (A/CNK=0.97~1.19). In addition, these granitic mylonites are enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE), and depleted in heavy rare earth elements (HREE) and high field strength elements (HFSE). The above features indicate that the primary magma was derived from partial melting of dehydrated thickened crust under high temperature and high pressure. Combined with the regional geological features, we conclude that the granitic mylonites in the Lingxia area emplaced in a extensionism setting of back- arc, which is related to the closure of the Paleo- Asia ocean; the age (157~153Ma)of metamorphic magma thermal events in the granitic mylonites is related to the closure of the Mongol- Okhotsk ocean; the main deformation time (137~117Ma) of the granitic mylonites is the Mid- stage of early Cretaceous, its limits on the starting time of the Western Pacific Izanagi plate obliquely subducting under the Eurasia plate.
keywords:Paleo- Asian tectonic regime  Mongol- Okhotsk regime  Western Pacific tectonic regime  granitic mylonites  zircon U- Pb geochronology  geochemistry  Lingxia area  western of the Songliao Basin
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