Late Paleozoic Crustal Growth and Tectonic Evolution in Balkhash Metallogenic Belt (Kazakhstan), Central Asia
详细信息
- 责任者：Liu Gang(Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Chen XuanHua
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(7)
- 关键词：地壳生长 ; crustal growth ; 花岗岩类 ; granitoid ; 成矿带 ; metallogenic belts ; 哈萨克斯坦 ; Kazakhstan
- 页码：p.1995-2008
- 图表：illus.,4 tables,39 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Balkhash metallogenic belt in Kazakhstan is a famous porphyritic Cu-Mo metallogenic belt in the Central Asian metallogenic domain. The Late Paleozoic granitoids from Balkhash metallogenic belt are mainly of high-K calc-alkaline and I-type granites, with shoshonite in the late stage. Geochemistry analyses and tectonic discrimination show a change of tectonic setting from syn-collision and volcanic arc in Carboniferous to post-collision in Permian. The Late Paleozoic granitoids from Borly porphyry deposit formed in classical island-arc environment, though that from Kounrad, Aktogai and Sayak are adakitic. The εNd(t) values for the Late Paleozoic granitoids here are between -5.87 and +5.94, and εSr(t)values from -17.16 to +51.10. The continental crustal growth histories are different on the both sides of Central Balkhash fault. On the east side, εNd(t) values from Aktogai and Sayak are very high with character of depleted mantle, suggesting the crustal growth in the Late Paleozoic. On the west side, εNd(t) values from Borly and Kounrad are slightly low, suggesting the existence of the New Proterozoic basement and the mixing of crust and mantle during magmatism. The granitoids have 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values ranging in 18.3346～20.9929, 15.5213～15.7321 and 38.2874～40.0209, respectively, showing the affinity of the Late Paleozoic magmatism in Balkhash with that in Tianshan, Altai and Junggar areas.
© 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 |