JIANG Yong-guo1, GUO Xin2, ZHOU Hong-rui3, NIAN Hong-liang4, CHEN Yan-xia5
(1. Yunnan Nonferrous Metals Geological Bureau, Kunming 650051, China;
2. Yunnan Land and Resources Vocational College, Kunming 650217, China;
3. China University of Geosciences, Beijing 100083, China;
4. No.317 Geological Part, Yunnan Nonferrous Metals Geological Bureau, Qujin 655000, China;
5. School of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China)
Abstract: In the geological cross sections between Shilong and Reshui villages in Malong and Zhanyi Counties, respectively, in Qujing area, Yunnan Province, China, Lower Cambrian black rock series were exposed widely. Black series rocks and Mo-Ni ores were analyzed for the contents of the major, trace and rare earth elements. The regional paleogeographic characteristics indicate that the black rock series in Qujing area formed in the environment of beach shore or shallow sea. The field section and rock fabrics reflect that the black series formed in anoxic hot water deposition environment with lower energy. The geochemical features of black series imply that some creatures were participated in the deposition process of the black series in Qujing area and were associated with the hydrothermal exhalative process. The black rock-forming materials were mainly terrigenous fragments with a little deep material.
Keywords: Lower Cambrian black rock; genesis; geochemistry; Qujing City; Yunnan Province
ACTA MINERALOGICA SINICA Vol. 35, No. 4, 2015, Page 489-496
