| 甘肃敦煌党河水库TTG地球化学特征、锆石SHRIMP U-Pb定年及其构造意义 |
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| 引用本文： | 张志诚,郭召杰,邹冠群,冯志硕,李建锋.甘肃敦煌党河水库TTG地球化学特征、锆石SHRIMP U-Pb定年及其构造意义[J].岩石学报,2009,25(3):495-505. |
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| 作者姓名： | 张志诚 郭召杰 邹冠群 冯志硕 李建锋 |
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| 作者单位： | 北京大学造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京,100871 |
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| 基金项目： | 国家自然科学基金( 40032010, 40672130)和北京大学大型仪器开放测试基金 |
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| 摘 要： | 甘肃敦煌党河水库岩体以花岗闪长岩为主,并构成英云闪长岩-花岗闪长岩-奥长花岗岩的TTG组合。锆石SHRIMP U-Pb年为440±12Ma (MSWD=2.5),代表TTG系列岩石的侵位时代。岩石化学成分中SiO2含量约为57.02%~72.75%,随着SiO2含量的增加,TiO2、Al2O3、MgO、CaO和FeO等的含量相应下降,这表明该套岩石具岩浆成因,是角闪石和斜长石的分离作用控制下岩浆分异的产物。岩石的稀土元素总量较低,轻重稀土分异明显,(La/Yb) N＝4.70~58.88,无或略具微弱的Eu异常,近于平行的稀土元素配分曲线表明所有岩石具有同成因的亲缘关系。岩石富集大离子亲石元素Rb、K、Th、Sr等,亏损Nb和Ta等高场强元素以及P和Ti。在Rb/30-Hf-3×Ta和Rb/30-Hf-0.25×Nb图解上,所有岩石的投影点落到岛弧到后碰撞区。但从区域地质背景、TTG的产出环境、形成时代及与敦煌地块南北缘火成岩对比分析,认为该TTG系列岩石并非形成于岛孤构造环境,而是加里东造山作用晚期(约440Ma)红柳河缝合带和(或者)阿尔金北缘红柳沟拉配泉俯冲碰撞带,引发富含角闪石的下地壳源岩部分熔融形成岩浆,上侵过程中同化部分陆壳物质形成具有岛弧性质的岩浆岩。
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| 关 键 词： | 敦煌 党河水库 锆石SHRIMP U-Pb定年 |
| 收稿时间： | 2008/12/9 0:00:00 |
| 修稿时间： | 2/1/2009 12:00:00 AM |
Geochemical characteristics and SHRIMP U-Pb age of zircons from the Danghe reservoir TTG in Dunhuang, Gansu Province, and its significations |
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| ZHANG ZhiCheng,GUO ZhaoJie,ZOU GuanQun,FENG ZhiShuo and LI JianFeng.Geochemical characteristics and SHRIMP U-Pb age of zircons from the Danghe reservoir TTG in Dunhuang, Gansu Province, and its significations[J].Acta Petrologica Sinica,2009,25(3):495-505. |
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| Authors: | ZHANG ZhiCheng GUO ZhaoJie ZOU GuanQun FENG ZhiShuo and LI JianFeng |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, Chin;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | |
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| Keywords: | TTG |
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