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江南造山带石耳山新元古代花岗岩的构造变形、LA- ICP- MS锆石U- Pb年龄及其地质意义
投稿时间:2018-01-27  修订日期:2018-07-20  点此下载全文
引用本文:王阳阳,宋传中,李加好,李振伟,袁芳,任升莲,林寿发,王微,葛延鹏,李振强.2019.江南造山带石耳山新元古代花岗岩的构造变形、LA- ICP- MS锆石U- Pb年龄及其地质意义[J].地质论评,65(1):85-101,[DOI]:.
WANG Yangyang,SONG Chuanzhong,LI Jiahao,LI Zhenwei,YUAN Fang,REN Shenglian,LIN Shoufa,WANG Wei,GE Yanpeng,LI Zhenqiang.2019.Deformational Characteristics and LA- ICP- MS Zircon U- Pb Ages of Granites at Shiershan in the Jiangnan Orogen and Their Geological Significance[J].Geological Review,65(1):85-101.
DOI:10.16509/j.georeview.2019.01.007
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作者单位E-mail
王阳阳 1)合肥工业大学资源与环境工程学院 中国合肥 230009 1986175647@qq.com 
宋传中 1)合肥工业大学资源与环境工程学院 中国合肥 230009 czsong69@163.com 
李加好 1)合肥工业大学资源与环境工程学院 中国合肥 230009  
李振伟 1)合肥工业大学资源与环境工程学院 中国合肥 230009  
袁芳 1)合肥工业大学资源与环境工程学院 中国合肥 230009  
任升莲 1)合肥工业大学资源与环境工程学院 中国合肥 230009  
林寿发 1)合肥工业大学资源与环境工程学院 中国合肥 2300092)加拿大滑铁卢大学地球科学系加拿大安大略滑铁卢N2L3G1  
王微 3)东华理工大学 核资源与环境国防重点实验室 中国南昌 330013  
葛延鹏 1)合肥工业大学资源与环境工程学院 中国合肥 230009  
李振强 1)合肥工业大学资源与环境工程学院 中国合肥 230009  
基金项目:注: 本文为中国地质调查局项目(编号:DD20160082)和国家自然科学基金资助项目(编号:41272222)的成果。
中文摘要:在江南造山带的东段皖浙赣交界地区发育一系列花岗岩岩体,区域上,岩体呈条带状,NE—SW向雁行排列,平行于赣东北断裂带分布;微观下,岩浆流动组构残迹、蠕英石的普遍发育及固态塑性变形证明了该地区岩体变形经历了从岩浆—亚岩浆—固态变形的一个持续转变的过程;岩体锆石年龄与邻区岩体的变质变形年龄有很好的耦合性。由此可见研究区变形花岗岩体为同构造花岗岩,是岩浆在侵位冷凝过程中受到赣东北断裂带强烈构造作用影响的产物。LA- ICP- MS锆石U- Pb同位素定年结果表明:灵山岩体形成于783±14Ma;莲花山岩体形成于780±12Ma,属于新元古代岩浆活动。扬子板块与华夏板块碰撞导致江南造山带新元古界的岩群普遍遭受区域变质、变形作用,同构造花岗岩的构造变形特征正是区域构造变形的表现,因此该同构造岩体的年龄可能作为扬子板块与华夏板块仍在挤压、碰撞的年代学证据。
中文关键词:江南造山带  板块汇聚  同构造花岗岩  锆石U- Pb年龄
 
Deformational Characteristics and LA- ICP- MS Zircon U- Pb Ages of Granites at Shiershan in the Jiangnan Orogen and Their Geological Significance
NameInstitution
WANG Yangyang1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
SONG Chuanzhong1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
LI Jiahao1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
LI Zhenwei1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
YUAN Fang1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
REN Shenglian1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
LIN Shoufa1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China;2) Department of Earth and Sciences, University of Waterloo, Waterloo, Ontario N2L3G1, Canada
WANG Wei3) Key Laboratory of nuclear resources and environment of Donghua University of science and technology, Nanchang, 330013, China
GE Yanpeng1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
LI Zhenqiang1) School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
Abstract:Objectives: There are a large number of deformational granites at the junction of Anhui, Zhejiang, and Jiangxi province in the eastern part of the Jiangnan orogen. A lot of researches have been done by the isotope chronology and geochemistry on the granites. However, the structural deformation characteristics of the granites are little investigated. In this research, we focus on the deformational characteristics and geochronology of granites and their regional geological significant. Methods: On the basis of detailed field work, the structural analysis and LA-ICP- MS zircon U- Pb dating are carried out on the granites. Results: The granites distribute in NE direction and parallel to the northeastern Jiangxi deep fracture zone. A lot of structures, such as foliation and mineral lineation of mylonite, rotated porphyroblast and S—C fabrics, indicated that the granites had been suffered ductile shearing. Meanwhile, widely developed of the remnants of early magma flow, myrmekite and solid plastic deformation truly recorded the process of semi solid flow and deformation of the granites. The LA- ICP- MS zircon U- Pb dating results of two samples is 783±14 Ma and 780±12 Ma, indicating that formation of granites in this region is about at 780 Ma. These ages are in accordance with ages of regional metamorphic and deformation. Conclusion: The results show that the granites at the junction of Anhui, Zhejiang, and Jiangxi are syntectonic. They are affected by the ductile shearing in the process of magmatic emplacement—condensation. They are the products of the collision between Yangtze Plate and Cathaysian Plate.
keywords:Jiangnan orogenic belt  Plate convergence  Syntectonic granite  Zricon U-Pb dating
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