Late Permian-Middle Triassic Mafic Sills from Kuruktag, Tarim Basin: Petrochemical Characteristics and Geological Implication
- 责任者：Bian Weihua (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Wang Pujun
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(1)
- 关键词：基性岩 ; basic rocks ; 岩床 ; sills
- 页码：p.274-282
- 图表：6 illus., 3 tables, 38 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
In Mohoershan Formation, Middle Cambrian, 3 mafic sills formed during Late Permian to Middle Triassic have been detailed lithologically logged and sampled for geological dating and geochemical analysis in Kuruktag, Tarim Basin, Xinjiang, NW China. The mafic sills were composed of lower diabase sill, middle gabbro sill and upper dolerite sill which intruded into Middle Cambrian strata along the interface of neighboring sedimentary beds. The geochemical characteristics of these sills show great similarities. Taking into account the geochemical features as well as the geological settings, these sills derived from same magma source. The magma was formed within the upper mantle and partially contaminated by the lower continental crust according to the standard mineral forming pressure, the REE pattern and trace earth element spider plot.