期刊
GONDWANA RESEARCH
卷 17, 期 1, 页码 145-152出版社
ELSEVIER
DOI: 10.1016/j.gr.2009.05.011
关键词
Sanukitoid; Ridge subduction; Junggar; Cu-Au mineralization; Dike
资金
- National Basic Research Program of China [2007CB411308]
- NSFC [40721063, 40421303, 40772130]
- Hong Kong RGC [HKU 7043079]
- HKU CRCG
- CAS/SAFEA International Partnership Program for Creative Research Teams
Late Paleozoic High-Mg dioritic dikes widely occur in western Junggar, NW China. Ar-Ar dating on rock chips of the dikes has yielded a plateau age of 321 +/- 3 Ma, indicating an early Carboniferous age for the dikes. The dikes are enriched in SiO2 (52-57 wt.%), and characterized by high MgO (5.13-7.41 wt.%), Cr (134-204 ppm). Ni (59-141 ppm), Sr (468-724 ppm) and Ba (316-676 ppm) contents, with geochemical features analogous to those of sanukite of Setouchi volcanic belt, Japan. These dikes contain hornblende and biotite and generally have high Ba/La (27-124) and La/Nb (2.9-4.3) ratios and positive Eu anomalies, consistent with an origin from hydrous partial melting of a mantle source metasomatised by slab-derived component. The occurrence of sanukitic dikes, together with the coeval slab-related adakite in the area, implies that the western Junggar had been affected by hot, subduction-related regime, which gave rise to not only massive magmatism in the late Carboniferous, but also intensive Cu-Au mineralization in the area. (C) 2009 International Association for Gondwana Research. Published by ELsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据