کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4697109 | 1637239 | 2015 | 12 صفحه PDF | دانلود رایگان |
• The Re–Os isotopic dating of arsenopyrites yields isochron ages of 204 ± 19 Ma for Lannigou, 206 ± 22 Ma for Jinya, and 235 ± 33 Ma for Shuiyindong gold deposit.
• The metallogenic epoch for Carlin-like gold deposit is definitely earlier than that of Late Cretaceous magmatism (80–100 Ma) in the area.
• The tectonic setting of Carlin-like gold deposit is post-collisional lateral transpression.
The Yunnan–Guizhou–Guangxi “golden triangle” is considered to be one of the regions hosting Carlin-like gold deposits in China. Gold deposits in this region can be grouped into lode type that are controlled by faults and layer-like type controlled by stratigraphy. Arsenopyrite is one of the major gold-bearing minerals in these deposits. Rhenium–Os isotopic dating of arsenopyrite from the lode type Lannigou and Jinya and the layer-like type Shuiyindong gold deposits yields isochron ages of 204 ± 19 Ma, 206 ± 22 Ma, and 235 ± 33 Ma, respectively. The data suggest that the Carlin-like gold deposits formed in Late Triassic to Early Jurassic, which is clearly earlier than the ca. 100–80 Ma acid to ultra-basic magmatism in this part of southwestern China. The ages are consistent with ore formation during a period of post-collisional lateral transpression, which is similar to that of the Carlin-like gold deposits in western Qinling of China, but quite different from Carlin-type gold deposits in Nevada, U.S.A.
Journal: Ore Geology Reviews - Volume 64, January 2015, Pages 316–327