The post-collisional Cihai iron skarn deposit, eastern Tianshan, Xinjiang, China

The post-collisional Cihai iron skarn deposit, eastern Tianshan, Xinjiang, China
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中国新疆东天山磁海铁矽卡岩矿床

DOI:
10.1016/j.oregeorev.2014.12.006
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发表时间:
2015-06
影响因子:
3.3
通讯作者:
Zhu Yongfeng
Zhu Yongfeng
中科院分区:
地球科学2区
文献类型:
--
作者:
Zheng Jiahao;Mao Jingwen;Yang Fuquan;Liu Feng;Zhu Yongfeng

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磁海铁夕卡岩存款矿床位于新疆东天山南部。主要铁矿体呈条带状,彼此几乎平行。铁矿石赋存于早期展布岩脉和矽卡岩中。后矿岩脉切割铁矿石和其承载岩。根据地质和岩相学观察,热液活动可分为四个阶段:初始K-Na蚀变(I期)、矽卡岩-次要磁铁矿事件(II期)、退变质矽卡岩-磁铁矿主矿事件(III期)和石英-方解石-硫化物脉状(IV期)。锆石U-Pb定年结果表明,早期闪长岩脉的年龄为286.5 ± 1.8Ma,成矿后闪长岩脉的年龄为275.8 ± 2.2Ma。从块状磁铁矿中分离出的角闪石给出40 Ar-39 Ar坪年龄为281.9 ± 2.2 Ma,是成矿时间。磁海铁矿存款的形成与东天山碰撞后岩浆活动及伴生的Cu-Ni-Au多金属成矿作用密切相关。
The Cihai iron skarn deposit is located in the southern part of the eastern Tianshan, Xinjiang, northwestern China. The major iron orebodies are banded and nearly parallel to each other. The iron ores are hosted in an early diabase dike and in skarn. Post-ore diabase dikes cut the iron ores and their hosting diabase. Hydrothermal activity can be divided into four stages based on geological and petrographic observations: initial K–Na alteration (stage I), skarn-minor magnetite event (II), retrograde skarn-magnetite main ore event (III), and quartz–calcite–sulfide veining (IV). Zircon U–Pb dating yields ages of 286.5 ± 1.8 Ma for early diabase and 275.8 ± 2.2 Ma for post-ore diabase dikes. Amphibole separated from massive magnetite ore gives a40Ar–39Ar plateau age of 281.9 ± 2.2 Ma and is the time of ore formation. Formation of the Cihai iron deposit is closely related to post-collisional magmatism and associated Cu–Ni–Au polymetallic mineralization in the eastern Tianshan.
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