| 吐格尔明背斜核部花岗岩的年代学、地球化学与构造环境及其对塔里木地块北缘古生代伸展聚敛旋回的揭示 |
| |
| 引用本文： | 何登发,袁航,李涤,雷刚林,樊春,常秋生,叶茂林.吐格尔明背斜核部花岗岩的年代学、地球化学与构造环境及其对塔里木地块北缘古生代伸展聚敛旋回的揭示[J].岩石学报,2011,27(1):133-146. |
| |
| 作者姓名： | 何登发 袁航 李涤 雷刚林 樊春 常秋生 叶茂林 |
| |
| 作者单位： | 海相储层演化与油气富集机理教育部重点实验室,中国地质大学,北京 100083;海相储层演化与油气富集机理教育部重点实验室,中国地质大学,北京 100083;海相储层演化与油气富集机理教育部重点实验室,中国地质大学,北京 100083;中国石油塔里木油田公司勘探开发研究院,库尔勒 841000;海相储层演化与油气富集机理教育部重点实验室,中国地质大学,北京 100083;中国石油新疆油田公司勘探开发研究院,克拉玛依 834000;中国石油塔里木油田公司勘探开发研究院,库尔勒 841000 |
| |
| 基金项目： | 本文受国家自然科学基金重点项目(40739906)和国家重点基础研究发展计划项目(2006CB202300)联合资助. |
| |
| 摘 要： | 塔里木盆地北缘库车坳陷东部地区吐格尔明背斜核部花岗岩发育,该套花岗岩侵位于以云母石英片岩为主的元古界基底岩系中,上覆的三叠系以角度不整合与其接触。本区花岗岩的研究对揭示库车地区的基底性质与构造演化历史具有重要意义。对吐格尔明花岗岩锆石的U-Pb年代学和岩石地球化学的研究表明, 吐格尔明背斜核部的花岗岩锆石为典型岩浆成因锆石,其锆石SHRIMP U-Pb定年结果分别为626.4±5.2Ma~643.3±4.0Ma,表明它们的形成时代为新元古代晚期埃迪卡拉纪早期。该套花岗岩的SiO2 (67.95%~78.59%)和Al2O3 (11.81%~16.21%) 含量均很高,A/CNK在1.2~1.6,为硅和铝过饱和类型,属典型的过铝质花岗岩;稀土元素总量为106×10-6~207×10-6,稀土元素配分曲线呈右倾型,具有明显的负Eu异常;高场强元素(Ta、Nb、Ti等)具有明显的负异常,大离子亲石元素(Rb、Ba、Sr等) 具有明显的正异常。吐格尔明花岗岩是由地壳物质在底侵热源或构造动力作用下引起的局部熔融形成的,属典型的壳源成因类型,形成于挤压环境向伸展环境转化阶段,推测塔里木北缘在震旦纪已开始伸展,代表了古亚洲洋早期的伸展构造环境。实验测得花岗岩钾长石40Ar/39Ar年龄平均为291.4~255.8Ma,代表了花岗岩的隆升剥蚀年龄,反映出吐格尔明花岗岩在二叠纪受到挤压发生剥露的过程。因而从年代学框架上更好地约束了塔里木地块北缘在古生代由伸展裂解到聚敛隆升的构造旋回。
|
| 关 键 词： | 花岗岩 锆石U-Pb定年 Ar-Ar年龄 地壳重熔 构造旋回 吐格尔明背斜 塔里木盆地 |
| 收稿时间： | 2010/7/11 0:00:00 |
| 修稿时间： | 2010/12/1 0:00:00 |
Chronology, geochemistry and tectonic setting of granites at the core of Tugerming anticline, Tarim Basin: Indications of Paleozoic extensional and compressional cycle at the northern margin of Tarim continental block |
| |
| HE DengF,YUAN Hang,LI Di,LEI GangLin,FAN Chun,CHANG QiuSheng and YE MaoLin.Chronology, geochemistry and tectonic setting of granites at the core of Tugerming anticline, Tarim Basin: Indications of Paleozoic extensional and compressional cycle at the northern margin of Tarim continental block[J].Acta Petrologica Sinica,2011,27(1):133-146. |
| |
| Authors: | HE DengF YUAN Hang LI Di LEI GangLin FAN Chun CHANG QiuSheng and YE MaoLin |
| |
| Institution: | Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;Institute of Exploration and Development of Tarim Oil Field Company,PetroChina, Korle 841000, China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;Institute of Exploration and Development of Xinjiang Oil Field Company,Karamay 834000, China;Institute of Exploration and Development of Tarim Oil Field Company,PetroChina, Korle 841000, China |
| |
| Abstract: | Granites occur at the core of Tugerming anticline of eastern Kuqa depression at the northern margin of Tarim Basin.It intrudes in Proterozoic mica-quartz schist,and is overlain unconformably by Upper Triassic series.The study on granites in the area is a key to address the basement character and tectonic processes in Kuqa depression.The research on zircon U-Pb dating and rock geochemistry of granites in Tugerming anticline shows that the zircon of granites is typical of magmatic genesis.Its SHRIMP U-Pb dati... |
| |
| Keywords: | Granite Zircon U-Pb dating Ar-Ar dating Crust remelting Tectonic Cycle Tugerming Anticline Tarim Basin |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩石学报》浏览原始摘要信息 |
| 点击此处可从《岩石学报》下载免费的PDF全文 |
|
