塔里木大火成岩省柯坪地区早二叠世玄武岩岩石磁学性质研究  

Study on the magnetic properties of the basalt in Keping area, Early Permian Tarim Large Igneous Province

作　　者：邵瑞琦 杨兴峰 周亚楠[1] 程鑫[1] 姜南 张伟杰 霍斐斐[1] 边紫薇 刘雨纯 吴汉宁[1] SHAO Rui-qi;YANG Xing-feng;ZHOU Ya-nan;CHENG Xin;JIANG Nan;ZHANG Wei-jie;HUO Fei-fei;BIAN Zi-wei;LIU Yu-chun;WU Han-ning(Department of Geology,State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China;Insitute of Science and Technology Strategy,Jiangxi Academy of Science,Nanchang 330096,China)

机构地区：[1]西北大学地质学系,大陆动力国家重点实验室,西安710069 [2]江西省科学院科技战略研究所,南昌330096

出　　处：《地球物理学进展》2019年第6期2180-2187,共8页Progress in Geophysics

基　　金：国家自然基金(91855211,41702233,41674070);江西省科学院科研开发专项基金博士项目(2018-YYB-17);陕西省自然科学基础研究计划青年项目(2017JQ4027);陕西省教育厅科研计划项目(17JK0784)联合资助

摘　　要：石炭-二叠纪时期被认为是全球构造运动机制由古到新的转换期.在这一时期内,塔里木板块内部经历了大规模的岩浆活动,构成了我国境内又一个大火成岩省.综合研究塔里木大火成岩省早二叠世玄武岩中磁性矿物组合类型、特征和粒径,可为进一步明确其快速形成过程提供必要的岩石磁学依据.本文对采自柯坪地区库普库兹满和开派兹雷克组样品进行了系统的岩石磁实验,包括饱和等温剩磁获得曲线、三轴等温剩磁系统热退磁实验、k-T曲线、磁滞回线和一阶反转曲线等.实验结果表明,库普库兹满组和开派兹雷克组样品中以钛磁铁矿和磁铁矿等低矫顽力磁性矿物为主,磁性矿物磁畴类型为SD、PSD与MD颗粒混合.本文结果还显示开派兹雷克组与库普库兹满组样品适宜开展进一步的古强度研究.The Carboniferous-Permian is a very important period when the ancient tectonic-kinematics system transformed into the new tectonic-kinematics system.In this period,the large-scale magmatic activity had been occurred in the Tarim Block,and this magmatism has been became a new large igneous province in China.In order to identify the rock magnetic properties of the basalt during the rapid formation of Tarim Large Igneous Province,a system rock magnetic research,including curve analysis,three-axis isothermal thermal demagnetization test,hysteresis loop,k-T curve test and FORC curves were carried out on the Kupukuziman and Kaipaizileike formations.The rock magnetic results indicate that the dominance magnetic carriers of Kaipaizileike and Kupukuziman formations are Titanium-magnetite and magnetite.The size of magnetic mineral particles in these basalt are SD,MD and SP particles.The results obtained this paper also indicate that the samples from the Kaipaizileike and Kupukuziman formation are situable for the paleointensity research further.

关 键 词：岩石磁学 塔里木大火成岩省 柯坪地区 早二叠世 库普库兹满及开派兹雷克组 

分 类 号：P318[天文地球—固体地球物理学]