Geological Characteristics and Zircon U-Pb Dating of Volcanic Rocks from the Beizhan Iron Deposit in Western Tianshan Mountains, Xinjiang, NW China

The Beizhan large iron deposit located in the east part of the Awulale metallogenic belt in the western Tianshan Mountains is hosted in the Unit 2 of the Dahalajunshan Formation as lens, veinlets and stratoid, and both of the hanging wall and footwall are quartz-monzonite; the dip is to the north wi...

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Bibliographic Details
Published in:Acta geologica Sinica (Beijing) 2012-06, Vol.86 (3), p.737-747
Main Authors: Zuoheng, ZHANG, Wei, HONG, Zongsheng, JIANG, Shigang, DUAN, Lingang, XU, Fengming, LI, Xincheng, GUO, Zhengang, ZHAO
Format: Article
Language:English
Subjects:
Beizhan
Calcite
Deposits
Formations
Geology
Iron
iron ore
Mountains
skarnization
Surface layer
Texture
Western Tianshan Mountains
Zircon U-Pb dating
中国西北
地质特征
大哈拉军山组
天山西部
存款
火山岩
铁矿床
锆石U-Pb年龄
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Summary:The Beizhan large iron deposit located in the east part of the Awulale metallogenic belt in the western Tianshan Mountains is hosted in the Unit 2 of the Dahalajunshan Formation as lens, veinlets and stratoid, and both of the hanging wall and footwall are quartz-monzonite; the dip is to the north with thick and high-grade ore bodies downwards. Ore minerals are mainly magnetite with minor sulfides, such as pyrite, pyrrhotite, chalcopyrite and sphalerite. Skarnization is widespread around the ore bodies, and garnet, diopside, wollastonite, actinolite, epidote, uralite, tourmaline sericite and calcite are ubiquitous as gangues. Radiating outwards from the center of the ore body the deposit can be classified into skarn, calcite, serpentinite and marble zones. LA-ICP-MS zircon U-Pb dating of the rhyolite and dacite from the Dahalajunshan Formation indicates that they were formed at 301.3±0.8 Ma and 303.7±0.9 Ma, respectively, which might have been related to the continental arc magmatism during the late stage of subduction in the western Tianshan Mountains. Iron formation is genetically related with volcanic eruption during this interval. The Dahalajunshan Formation and the quartz-monzonite intrusion jointly control the distribution of ore bodies. Both ore textures and wall rock alteration indicate that the Beizhan iron deposit is probably skarn type.
ISSN:1000-9515
1755-6724
DOI:10.1111/j.1755-6724.2012.00699.x