大兴安岭北部塔河堆晶辉长岩体的形成时代、地球化学特征及其成因

周长勇　吴福元　葛文春　孙德有　Abdel RAHMAN A A　张吉衡　程瑞玉

大兴安岭北部塔河堆晶辉长岩体的形成时代、地球化学特征及其成因

周长勇　吴福元　葛文春　孙德有　Abdel RAHMAN A A　张吉衡　程瑞玉

- 吉林大学地球科学学院，中国科学院地质与地球物理研究所，吉林大学地球科学学院，吉林大学地球科学学院，吉林大学地球科学学院，吉林大学地球科学学院，吉林大学地球科学学院长春 130026，北京 100029，长春 130026，长春 130026，长春 130026 Department of Geology and Mining，University of Juba，Khartoum 321／1，Sudan，长春 130026，长春 130026
基金项目:
本文为国家自然科学基金（40372038,40325006）、国家油气专项（XQ-2004-07）和西北大学地质学系大陆动力学实验室资助研究成果

收稿日期: 2005-02-27

修回日期: 2005-02-27

刊出日期: 2005-05-31

Age, geochemistry and petrogenesis of the cumulate gabbro in Tahe, northern Da Hinggan Mountain

ZHOU ChangYong,WU FuYuan,GE WenChun,SUN DeYou,Abdel RAHMAN A A,ZHANG JiHeng and CHENG RuiYu College of Earth Sciences,Jilin University,Changchun 130026,China Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China Department of Geology and Mining,University of Juba,Khartoum 321/1,Sudan

Received Date: 27 February 2005

Revised Date: 27 February 2005

Publish Date: 31 May 2005

摘要

摘要: 本文系统地报道了大兴安岭北部塔河辉长岩的主量元素、微量元素和锆石Hf同位素特征,重点讨论了塔河堆晶辉长岩体的岩石成因、原始岩浆的源区特征及其地质意义。研究结果表明,塔河堆晶辉长岩体SiO2含量从42．5％到47．4％,平均为45．2％,Al2O3为15．9-32．9％,平均为23．6％,大于17％,CaO为11．7-17．1％,TiO2<0．5％,P2O5<0．1％,富集LILE, 亏损HFSE,这些地球化学特征类似于活动大陆边缘或岛弧环境的辉长岩。激光ICP-MS锆石年龄测定结果显示,塔河辉长岩形成于333±8 Ma前。负的εHf(t)值(-2--5)表明其源区为富集型岩石圈地幔或下地壳。因此,本文推测,塔河堆晶辉长岩来自于地幔辉石岩的部分熔融,该源区的形成可能与俯冲背景下流体交代作用有关,从而表明在330 Ma左右,该区存在过板块的消减作用,可能与松嫩和兴安地块拼合有关。
- 岩石成因 /
- 锆石U—Ph定年 /
- 塔河堆晶辉长岩 /
- 大兴安岭
- Petrogenesis /
- Zircon U-Pb age /
- Tahe cumulate gabbro /
- Da Hinggan Mountain

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大兴安岭北部塔河堆晶辉长岩体的形成时代、地球化学特征及其成因

Age, geochemistry and petrogenesis of the cumulate gabbro in Tahe, northern Da Hinggan Mountain

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