Metallogenic Geological Background of the Kalagailei Copper-Gold Deposit in Zhaosu County, Xinjiang
详细信息
- 责任者：Ge Wensheng (China University of Geosciences ; Beijing 100083 ; China) ; Li Xiaofei
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：14(3)
- 关键词：铜矿 ; copper ores ; 金矿 ; gold ores ; 新疆 ; Xinjiang
- 页码：p.275-286
- 图表：illus., 2 tables, 48 refs.
- 分类号：1001
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
The Kalagailei volcanics-hosted hydrothermal copper-gold deposit is located in the western part of Nalati tectonic belt of Western Tianshan Mountains, Xinjiang. The ore-controlling strata are basaltic tuffs, epimetamorphic rocks and crypto-explosive breccia of Lower Carboniferous Dahalajunshan Formation. The copper ore bodies occur in crypto-explosive breccia pipes and fissures of the structural fracture zone, or in the micro-fractures of schistosity and cleavage. Silicification, chloritization, tourmalinization are the alteration indications of high-grade ores. Geochemical data show that volcanic rocks of Dahalajunshan Formation consist mainly of calc-alkaline series with partial tholeiite series, which are enriched in LREE and large-ion-lithophile elements (Rb, Ba, Th, K) and comparatively depleted in HREE and high field strength elements (Nb, Ta, Ti, P), possessing continental volcanic arc affinity. In combination with the tectonic evolution characteristics of the south margin of Yili-Central Tianshan plate, the authors consider that the Dahalajunshan Formation of the ore district occurred in a comparatively mature continental volcanic arc environment of plate subduction-collision in the later period.