青海共和盆地周缘印支期花岗岩类的成因及其构造意义

张宏飞　陈岳龙　徐旺春　刘荣　袁洪林　柳小明

青海共和盆地周缘印支期花岗岩类的成因及其构造意义

张宏飞　陈岳龙　徐旺春　刘荣　袁洪林　柳小明

- 张宏飞（中国地质大学地质过程与矿产资源国家重点实验室,武汉,430074;中国地质大学地球科学学院,武汉,430074）　　　　　　陈岳龙（中国地质大学地球和资源学院,北京,10083）　　　　　　徐旺春（中国地质大学地球科学学院,武汉,430074）　　　　　　刘荣（中国地质大学地球科学学院,武汉,430074）　　　　　　袁洪林（西北大学大陆动力学国家重点实验室,西安,710069）　　　　　　柳小明（西北大学大陆动力学国家重点实验室,西安,710069）
基金项目:
国家自然科学基金（40234052,40521001）和教育部长江学者和创新团队发展计划（IRT0441）资助项目.感谢评审人和编辑对本文提出的宝贵意见.

收稿日期: 2006-03-22

修回日期: 2006-11-12

刊出日期: 2006-12-31

Granitoids around Gonghe basin in Qinghai province: petrogenesis and tectonic implications

Received Date: 22 March 2006

Revised Date: 12 November 2006

Publish Date: 31 December 2006

摘要

摘要: 本文对青海共和盆地周缘印支期黑马河岩体、温泉岩体、大河坝岩体和同仁岩体花岗闪长岩进行了主量元素、微量元素和Pb-Sr-Nd同位素地球化学研究,并对黑马河岩体和温泉岩体进行锆石U-Pb LA-ICP-MS年代学研究.结果表明,黑马河岩体的岩浆结晶年龄为235±2 Ma,属印支早期,而温泉岩体的岩浆结晶年龄为218±2Ma,属印支晚期.这些印支期花岗闪长岩的SiO2=63.34～68.06%,K2O/Na2O=0.82～1.36,岩石均为准铝质(A/CNK=0.9～1.0),并属中钾到高钾钙碱性岩系.它们总体上具有相似的微量元素组成特征,并有着极为相似的稀土元素组成模式,(La/Yb)N值主要介于10～15之间,存在微弱到中等程度的负Eu异常(Eu/Eu*=0.5～0.8).岩石初始Sr同位素比值ISr=0.70701-0.70952,εNd(t)=-3.8到-8.4,指示它们的岩浆物质主要来自于地壳物质的部分熔融.这些岩石以高放射成因Pb同位素组成为特征,其全岩初始Pb同位素比值为(206 Pb/204 Pb)t=18.068～18.748、(207 Pb/204 Pb)t=15.591～15.649、(208 Pb/204 Pb)t=38.167～38.554.地球化学特征指示共和盆地周缘印支期花岗岩类的原岩为下地壳变玄武岩类,并且这类原岩可能派生于元古宙富集地幔,但在不同区段,下地壳变玄武岩类存在着一定程度化学组成的不均一性.根据花岗岩类对深部地壳物质的地球化学示踪及其区域对比,共和盆地周缘的西秦岭、柴达木(包括东昆仑)和欧龙布鲁克块体具有统一的地壳基底组成,并具有扬子型块体的构造属性.结合区域地质背景的分析,共和盆地周缘印支早期花岗岩类(以黑马河岩体为代表)可能形成于俯冲陆壳断离的地球动力学背景,而印支晚期花岗岩类(以温泉岩体为代表)形成于中央造山带在地壳加厚作用后岩石圈拆沉作用的地球动力学背景.
- 花岗岩类 /
- 岩石成因 /
- 构造属性 /
- 地球动力学 /
- 共和盆地 /
- 青海 /
- 中国西部
- Granitoids /
- Petrogenesis /
- Tectonic affinity /
- Geodynamics /
- Gonghe basin /
- Qinghai Province /
- West China

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青海共和盆地周缘印支期花岗岩类的成因及其构造意义

Granitoids around Gonghe basin in Qinghai province: petrogenesis and tectonic implications

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