Discovery of A-type Granite Zone and Its Geodynamic Significance in the Western Kunlun Mts., China

• 来源期刊: 大陆动力学（英文版）
• 学科: 地球科学
• 关键词: A-type granite geochemistry geodynamics western Kunlun Mts.
• 年，卷（期）: 2001,（2）
• 页码范围: 49-57
• 页数: 9页
• 分类号: P5
• 语种: 英文

摘要

There is a distinct zone of A-type granite in western Kunlun Mts. with the scope corresponding to the Kudi mantle steps. The A-type granites generated in late Indosinian, intergrowthing with late Hercynian I-type granites. The characteristics of A-type granitic rocks are enrichment in alkali, LREE,Y, Nb, Zr, lean in Al, Mg, Ca, Ba and Sr transition elements, and extended SiO2 contents, which are quite similar to those of A-type granite in Chaelundi, Australia. The research results indicate that the studied granites belong to A2-type which formed in late orogenic extension environment and intruded in the process of the lithospheric delamination.