XIANG Xian-li1, JIN Zhong-guo2, HUANG Zhi-long3, ZHOU Jiaxi3, GU Jing3
(1. Guizhou University of Engineering Science, Bijie 551700, China;
2. Guizhou Nonferrous Metal and Nuclear Industry Geological Exploration Bureau, Guiyang 550005, China;
3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)
Abstract: Bauxite deposits in Daozhen area, Northern Guizhou Province, China, are important parts of Guizhou-Chongqing bauxite belt. The bauxite deposits are belonging to the Lower Permian Liangshan Formation shale, which is overlaid by Upper Carboniferous limestone and Lower-Middle Silurian mud-shale. The bauxites contain large amounts of zircons. Based on LA-ICP-MS U-Pb dating and typical profile samples from Xinmin, Sanjiang, Sanqingmiao deposits, the research shows that the detrital zircons from bauxite ores have a wide range (413―2896 Ma). The detrital zircon populations of samples studied show four primary age peaks: 400 to 700 Ma, 700 to 1300 Ma, 1700 to 1900 Ma and 2400 to 2600 Ma. The zircon ages obtained are similar with the samples from bauxite, and Hanjiadian Formation and Huanglong Formation sedimentary rocks, concentrated on 700 to 1300 Ma. It is suggested that the source of bauxite deposits are complex, including Hanjiadian and Huanglong Formations, but the final provenances of the bauxites are the Western Yangtze Block and Neoproterozoic-Mesoproterozoic magmatic rocks in the Southern Cathaysia Block. So we include that the bauxites formed not in one stage, but in a process mixed with erosion, deposition and recycle.
Keywords: bauxite deposit; U-Pb dating; detrital zircon; ore-forming material; Guizhou Province
ACTA MINERALOGICA SINICA Vol. 35, No. 4, 2015, Page 463-472
