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New Re-Os Isotopic Constrains on the Formation of the Metalliferous Deposits of the Lower Cambrian niutitang Formation

引用

Journal of Earth Science 2016年第2期27卷 271-281页

作者： Yong Fu Lin Dong Chao Li Wenjun Qu Haoxiang Pei Wenlang Qiao Bing Shen College of Resource and Environmental Engineering Guizhou University Guiyang 550012 China Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Key Laboratory of Orogenic Belts and Crustal Evolution MOE School of Earth and Space Science Peking University Beijing 100871 China Re-Os lab National Research Center for Geoanalysis Chinese Academy of Geological Sciences Beijing 100037 China Institute of Guizhou Geological Survey Guiyang 550004 China

The Terreneuvian Epoch（541-521 Ma）is also an important period for metallogenesis in South China, as was represented by the widespread occurrences of ni-mo polymetallic layers on the antecedent shallow platform margin and the V-enriched black shales in deeper slope-basin settings. In this study, we have measured Re-Os isochron ages of ni-mo polymetallic layers（Songlin, niuchang, Sancha, Chuanpengwan）, V-rich black shales（Bahuang）, and non-metalliferous black shales（Shuidong） in the basal niutitang Formation in Guizhou and Hunan province, South China. The ni-mo polymetallic layers and V-enriched black shales have similar Re-Os isochron ages, suggesting concurrent deposition of these two types of metalliferous ores. This suggestion is consistent with the traditional stratigraphic correlation by using the nodular phosphorite bed directly underlying these metalliferous layers as a stratigraphic marker. Furthermore, the metalliferous ores and non-metalliferous black shales have similar initial ^（187）Os/^（188） Os ratios of 0.8-0.9, arguing for a dominant seawater origin with minor contribution of hydrothermal activity. Furthermore, Re-Os isotopic data also imply that ni-mo and V ore might have derived from the same source. We suggest that the spatial distribution of metalliferous ores can be explained by the development of non-sulfidic anoxic-suboxic wedge（NSASW） in the slope-basin and sulfidic wedge in the previous platform margin. Upwelling of deep water first transects the mildly reduced, organic rich NSASW, in which V（V） is reduced to V（IV）, and is preferentially removed from seawater by organometallic complex formation. As a result, V-rich black shale deposits in the slope-basin of Yangtze Platform. Further movement of deep water into the sulfidic platform margin results in ni-mo polymetallic layer formation.

关键词： niutitang Formation South China ni-mo polymetallic layer V-rich black shale Re-Osisochron ages.

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