NIAN Hong-liang1, CUI Yin-liang2, MENG Gui-hua1, JIANG Yong-guo1, CHENG Da-yu1, CAI Jin-jun1, DING De-sheng1
(1. No.317 Geological Part, Yunnan Nonferrous Metals Geological Bureau, Qujing 655000, China;
2. Yunnan Nonferrous Metals Geological Bureau, Kunming 650051, China)
Abstract: Canglongshan Mo-Ni poly-metallic deposit in Malong city, Yunnan Province, China is hosted in black shale of Shiyantou section, the Lower Cambrian Qiongzhusi Formation. This deposit consists of two stratiform Mo-Ni ore beds, being situated at the lower-middle part and upper part of the Shiyantou sections, respectively. The ore-bearing layers are thin-bedded, extensively distributed, and rich in associated elements. The distribution of ore bodies is significantly controlled by geologic structures, stratigraphy, petrology and lithofacies. The Mo-Ni ores are characterized by a laminated structure. The U/Th ratios of Mo-Ni ores range from 3.37 to 14.29, with a mean value of 8.64, indicating that the ores were subjected to intense hydrothermal activities. The ore genesis of Canglongshan Mo-Ni poly-metallic deposit is similar to Cambrian Mo-Ni deposits being widely distributed in South China. However, this deposit has two ore beds that are different from other Mo-Ni deposits in the South China and is valuable to do further research.
Keywords: black shale; ore genesis; the Lower Cambrian; Qiongzhusi Formation; Canglongshan Mo-Ni poly-metallic deposit; Malong city; Yunnan Province
ACTA MINERALOGICA SINICA Vol. 35, No. 4, 2015, Page 430-434
