HUANG Xing-kai1, AI Shi-qiang1,2, CUI Le-le1, LI Shi-heng1,3, ZHAO Lu-tong1, ZHAO Zhi-dan2
(1. Beijing Institute of Geology for Mineral Resources, Beijing 100012,China;
2. China University of Geosciences, School of Earth Science and Resources, Beijing 100083, China;
3. Kunming University of Science and Technology, Faculty of Land Resource Engineering, Kunming 650093, China)
Abstract: Sareke copper deposit, located in the Sarekebayi secondary basin of the Southwestern Tianshan Mountain, in the Xinjiang Uygur Autonomous Region, China, is a large scale sandstone type copper deposit recently exploited, which has attracted many geologists’ focus, leading to great progress in economic geology research. It is noteworthy that a great deal of diabases occur in the south ore district; however, there is yet no systematic study on diabase dikes in the Sareke Basin. This research generally collected diabase samples from drill holes and outcrops, and carried out systematic petro-geochemistry research. Results reveal that diabase samples show evolutionary trend of rich in titanium and alkali, poor in silicon, which can be categorized as high titanium gabbro, with SiO2 contents varying from 40.36% to 44.78%, and the variation ranges of TFe2O3 and TiO2 of 7.19%～10.67%, 2.28～2.73%, respectively. Primitive mantle-normalized trace element spidergrams and chondrite-normalized REE distribution patterns of samples show similar result with typical OIB. The petro-geochemistry characteristics of Sareke diabase is extremely similar to the basalt from the Tuoyun Basin, indicating that they were derived from the same source and formed in within-plate stretching tectonic settings, which can be related to the delamination of subcontinental lithosphere mantle, resulted from the remote compact of the Indo-Asian continental collision.
Keywords: the southwestern Tianshan Mountain; Sareke copper deposit; diabase; geochemistry characteristics; geodynamic implication
E-mail: jackyhua8626@163.com
ACTA MINERALOGICA SINICA Vol. 37, No. 5, 2017, Page 646-652
