40Ar/39Ar Age and Geochemistry of the Ultrapotassic Magmatic Rocks from Bugula in Nileke, Xinjiang and Its Tectonic Implication
详细信息
- 责任者：Yang Wubin (Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Niu Hecai
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(10)
- 关键词：火成岩 ; igneous rocks ; 氩—40 ; 氩—39 ; Ar-40／Ar-39 ; 地球化学 ; geochemistry ; 新疆 ; Xinjiang
- 页码：p.3065-3073
- 图表：3 illus., 2 tables, 60 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The ultrapotassic magmatic rocks with tectonic significance have been confirmed at Bugula in Nileke, West Tianshan Mountains. It intruded in the Carboniferous Dahalajunshan Formation outcrop area is about 0.02 km2, associated with the copper anomalous or mineralized zones. The ultrapotassic magmatic rocks show typical porphyritic texture, and the dominated phenocrysts are K-feldspar, olivine and pyroxene with some residual leucite or its pseudomorph occasionally. The Bugula ultrapotassic magmatic rocks are defined as the plagioleucitites type of ultrapotassic rocks by means of their rock-forming minerals and geochemical characteristics. So, the authors suggested that the eastern Awulale Mountains were within the stage of orogenic evolution in Middle Permian at least on the basis of the geochemical and geochronological studies of the ultrapotassic magmatic rocks.
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