No genetic link between Late Cretaceous felsic dikes and Carlin-type Au deposits in the Youjiang basin, Southwest China
No genetic link between Late Cretaceous felsic dikes and Carlin-type Au deposits in the Youjiang basin, Southwest China
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右江盆地晚白垩世长英质岩脉与卡林型金矿床之间无成因联系
DOI：
10.1016/j.oregeorev.2017.01.014
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发表时间：
2017-04
影响因子：
3.3
通讯作者：
Lu Gang
中科院分区：
文献类型：
--
作者：
Zhu Jingjing;Hu Ruizhong;Richards Jeremy P.;Bi Xianwu;Stern Richard;Lu Gang
右江盆地是我国著名的卡林型金矿集中分布区。区内长英质脉岩数十条，其中一些还存在于矿田内。以前曾提出这些长英质脉岩与成矿之间的成因联系，但详细的实地调查表明，脉岩横切主矿体，并明显滞后于金矿化。对右江盆地3条长英质脉岩进行了西姆斯锆石U-Pb测年，结果表明廖屯脉岩和下巴哈脉岩的侵位年龄为97.2 ± 1.1Ma（MSWD = 2.9）和95.4 ± 2.4 Ma（MSWD = 0.56），与巴马岩脉LA-ICP-MS锆石U-Pb年龄（99.4 ± 0.37Ma，MSWD = 1.4）基本一致。结合已发表的长英质脉岩的年龄，认为右江盆地的长英质岩浆事件发生在距今100 ~ 95 Ma之间。尽管各种方法报道了金矿化的广泛年龄范围（275-46 Ma），但最佳可用年龄表明时间在235和193之间（Fe硫化物的直接Re-Os定年; Chen等人，2015，滇黔桂“金三角”卡林型金矿床毒砂Re-Os等时线年龄明显大于长英质脉岩的侵位年龄。综上所述，我们认为右江盆地晚白垩世长英质脉岩与卡林型Au成矿作用之间没有成因联系。
The Youjiang basin in southwest China is distinguished by preserving a number of Carlin-type gold deposits. Tens of felsic dikes occur in this region, and some are present within the ore fields. A genetic link between these felsic dikes and ore-formation has previously been proposed, but detailed field investigation shows that the dikes crosscut the main ore body, and clearly postdate gold mineralization. Three felsic dikes in the Youjiang basin have been dated, and SIMS zircon U-Pb dating results show that the Liaotun and Xiabaha dikes were emplaced at 97.2 ± 1.1 Ma (MSWD = 2.9) and 95.4 ± 2.4 Ma (MSWD = 0.56), respectively, broadly consistent with a LA-ICP-MS zircon U-Pb age for the Bama dike (99.4 ± 0.37 Ma, MSWD = 1.4). Combined with published dates of the other felsic dikes in this region, it is suggested that the felsic magmatic event in the Youjiang basin occurred between ∼100 and 95 Ma. Although a wide range of ages for gold mineralization (275–46 Ma) has been reported by a variety of methods, the best available ages suggest a timing between 235 and 193 (Direct Re-Os dating on Fe-sulfides; Chen et al., 2015, Re–Os isochron ages for arsenopyrite from Carlin-like gold deposits in the Yunnan–Guizhou–Guangxi “golden triangle”, southwestern China), significantly older than the emplacement age of the felsic dikes. Taken together, we conclude that there is no genetic link between these Late Cretaceous felsic dikes and Carlin-type Au mineralization in the Youjiang basin.
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影响因子：
5.8
作者：
J. Cline
通讯作者：
J. Cline
影响因子：
64.8
作者：
S. Nakai;A. Halliday;S. Kesler;H. D. Jones
通讯作者：
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影响因子：
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作者：
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影响因子：
3.3
作者：
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通讯作者：
S. Peters;Jiazhan Huang;Zhiping Li;Chenggui Jing
DOI：
--
发表时间：
2006
期刊：
Guizhou Geology
影响因子：
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作者：
Liu Jian-zhong;Deng Yi-ming;Xiao Yong
通讯作者：
Liu Jian-zhong;Deng Yi-ming;Xiao Yong