Geochemical Characteristics of Basalts from Kaladawan in East Altun Mountains of Xinjiang and Their Implications
详细信息
- 责任者：Hao Ruixiang (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Chen Bailin
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：14(3)
- 关键词：玄武岩 ; basalts ; 阿尔金山 ; Altun Mountains
- 页码：p.307-317
- 图表：illus., 2 tables, 38 refs.
- 分类号：0801
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
Kaladawan area in the eastern part of the Altun Mountains is tectonically situated between the NE-trending Altun strike-slip fault and the WE-trending northern Altun marginal fault. In this area, there appears a set of volcanic-sedimentary rocks. A geochemical study was made for the basalts. The result shows that the basalts have low Mg # , the content of REE changes greatly, the LREE is moderately enriched, but the Eu anomaly is not obvious. Co, Cr and Ni are positively correlated with MgO. In the chondrite-normalized spidergrams, some samples have Nb and Ta anomalies, whereas some other samples show Ti anomalies. In the Th/Yb-Ta/Yb diagram, the basalts belong to active continental margins. In the Th/Hf-Ta/Hf diagram, the basalts belong to continental breakup setting or early rift. Combined with geochemical characteristics of basalts of bimodal volcanic rocks in Kaladawan area and basalts in other areas of the north Altun ophiolite belt, the authors hold that the basalts from the Kaladawan area might have erupted in the active continental margins.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |