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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第32卷

期数:

2010年第01期

页码:

34-39

栏目:

基础地质与矿产地质

出版日期:

2010-03-15

文章信息/Info

Title:

Trace Elements Geochemistry Feature and Tectonic Significance of the Beilekuduke Aluminous A-type Granite in East Junggar

文章编号:

1672-6561(2010)01-0034-06

作者:

杨高学¹; 李永军¹; 司国辉²; 吴宏恩³; 张永智³; 金朝¹

(1.长安大学 地球科学与资源学院,陕西 西安 710054; 2.西安地质矿产勘查开发院,陕西 西安 710100; 3.新疆维吾尔自治区有色地质矿产勘查院,新疆 乌鲁木齐 830000)

Author(s):

YANG Gao-xue¹;  LI Yong-jun¹;  SI Guo-hui²; WU Hong-en³; ZHANG Yong-zhi³; JIN Zhao¹

1.School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2.Xi'an Research Institute of Geology and Mineral Resources Exploration and Exploitation, Xi'an 710100, Shaanxi, China; 3.Xinjiang Institute of Geological Exploration for Nonferrous Resources, Urumqi 830000, Xinjiang, China

关键词:

地球化学; A型花岗岩; 地质意义; 贝勒库都克; 东准噶尔

Keywords:

geochemistry;  A-type granite;  geology significance;  Beilekuduke;  East Junggar

分类号:

P591

DOI:

-

文献标志码:

A

摘要:

通过对新疆东准噶尔卡拉麦里地区贝勒库都克岩体的岩石地球化学特征的研究,结果表明,在贝勒库都克黑云母花岗岩中Rb、K和Th等大离子亲石元素明显富集,相对富集Zr、Hf等高场强元素,相对亏损Ba、Sr、Nb和Eu等元素,稀土元素含量相对较高,Eu的负异常极强,稀土元素配分模式呈平坦的“V”字型,属于典型的铝质A型花岗岩。该花岗岩在成因上属于A2型,形成于后碰撞的张性环境,其来源可能与洋壳和岛弧建造组成的年轻地壳有关。花岗岩微量元素构造判别图显示它是一种后碰撞花岗岩,标志卡拉麦里地区在晚石炭世造山作用的结束和板内构造演化的开始。该岩体锡质量分数普遍都比较高(15.50×10^-6),为锡的成矿物质来源和锡矿矿床学的深入探索提供重要参考。

Abstract:

The geochemistry feature of rock in Beilekuduke granite in Kalamaili region of East Junggar, Xinjiang is discussed. The result shows that the biotite granites are typical aluminum A-type granites because of the enrichment of large-ion lithophile elements(Rb, K, Th, etc), relative enrichment of high field strength elements(Zr, Hf), relative loss of Ba, Sr, Nb, Eu, a high level of rare earth elements(REE), Eu negative anomaly extremely and flat “V” shaped of REE pattern. The granite is belong to A2-type originally and formed in the post-collision expansion environment, and may be derived from the young crust constructed by the oceanic crust and island arcs. Trace elements in granite tectonic discriminate diagram shows that it is a post-collisional granite, and indicates that the end of Late Carboniferous orogenesis in Kalamaili region and the start of plate tectonic evolution. The content of Sn, which is generally large(15.50×10^-6)in the granite, is very important for the study of tin mineral deposit and source.

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备注/Memo

备注/Memo:

收稿日期:2009-04-20
基金项目: 国家自然科学基金项目(40534020); 新疆维吾尔自治区国土资源厅国土资源大调查项目(QD200508)
作者简介: 杨高学(1980-),男,宁夏固原人,理学博士研究生,从事区域地质调查和岩石地球化学研究。E-mail:mllygx@126.com

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更新日期/Last Update: 2010-03-20