| 黔中地区陡山沱期开阳、瓮安磷矿区成矿作用研究现状探讨 |
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| 引用本文： | 杨海英,肖加飞,李艳桃,和景阳.黔中地区陡山沱期开阳、瓮安磷矿区成矿作用研究现状探讨[J].地质找矿论丛,2017,32(4):551-561. |
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| 作者姓名： | 杨海英 肖加飞 李艳桃 和景阳 |
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| 作者单位： | 中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550082;中国科学院大学, 北京 怀柔 101408,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550082,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550082,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550082;中国地质大学, 北京 100083 |
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| 基金项目： | 矿床地球化学国家重点实验室十二五项目群课题 |
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| 摘 要： | 在震旦纪陡山沱期,扬子地台发生了大规模的成磷事件,广泛发育磷质岩和碳酸盐岩沉积;磷质岩在黔中、鄂西等地构成了超大型矿床,代表了地球历史中最早出现的成磷事件。文章通过分析总结瓮安、开阳地区陡山沱期形成磷矿床的古地理环境、物质来源、成矿机制、成矿模式等,旨在于讨论磷块岩成因的研究现状,分析研究中存在歧义的原因,以此探讨成矿模式构建的具体研究方向,提出适宜的研究方法。陡山沱期黔中地区磷块岩研究主要有以下焦点:1)沉积环境的氧化-还原性质,海水氧化-还原分层模式;2)成矿物质来源存在多种观点,没有证据否定任何一种物质来源,但也没有直接证据证明磷的来源;3)多种成磷机制的观点并存,成磷作用为生物成磷作用、海相热水成磷作用、机械成磷作用和生物化学/化学成磷作用,但其相互作用之间关系不清楚。目前的成矿模式观点有"上升洋流成矿模式"、"沉积-成岩成矿模式",两种成矿模式仍需要进一步完善。因此,如何采取新的研究方法,展开对古地理环境、物质来源、成矿机制方面的研究值得深入讨论。构建黔中地区完整的海相沉积磷块岩的成矿模式,将在今后的扬子地台成矿系统讨论和矿床的找寻中发挥重要作用。
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| 关 键 词： | 陡山沱期 古地理环境 成矿作用 成矿模式 黔中地区 |
| 收稿时间： | 2016/9/26 0:00:00 |
| 修稿时间： | 2017/2/25 0:00:00 |
Discuss on the present situation of mineralization research of Wong'an, Kaiyang Sinian Doushantuo Period phosphorite in Central Guizhou |
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| YANG Haiying,XIAO Jiafei,LI Yantao and HE Jingyang.Discuss on the present situation of mineralization research of Wong''an, Kaiyang Sinian Doushantuo Period phosphorite in Central Guizhou[J].Contributions to Geology and Mineral Resources Research,2017,32(4):551-561. |
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| Authors: | YANG Haiying XIAO Jiafei LI Yantao and HE Jingyang |
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| Institution: | Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550082, China;University of Chinese, Academy of Sciences, Beijing Huairou 101408, China,Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550082, China,Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550082, China and Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550082, China;China University of Geosciences, Beijing 100083 |
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| Abstract: | Large-scale phosphogenic events occur at Yangtze Platform during Sinian Doushantuo Period with widely developed phosphorite and carbonate ropcks.Phosphorite in the Central Guizhou and The West Hubei province occur as gigantic phosphorus ore deposit and represent the earliest phosphogenic event in the earth history.Paleogeographic environment,material source,genetic mechanism,phosphogenic model are described in the paper to discuss the present situation of genetic study of phosphorite and analyze the ambiguity so as to orient the model building and put forward the study method.The study of phosphorite of Central Guizhou focus on the following aspects:(1) redox conditions of sedimentary environment,redox-stratification patterns in seawater;(2) material source.There are multiple viewpoints about the origins but none of them can give evidence to exclude the others and none gives direct evidence of phosphorus origin;(3) phosphogenisis.There are multiple viewpoints about phosphogenisis,such as biological mineralization,hydrothermal mineralization,mechanical mineralization,chemical/biochemical mineralization but relationship among them are ambiguous;there are several genetic models such as "upwelling sea water flow model" and "sedimentation-diagenesis model" which all need to be perfected.Therefore,how to conduct our research about paleogeographic environment,the origins of metallogenetic materials and genetic mechanisms with new technique needs further discussion.Establishing a complete phosphogenic model will play a vital role in metallogenic system discussion of Yangtze platform and phosphorite prospecting in the area. |
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| Keywords: | Doushantuo Formation paleogeographic environment metallogenetic process metallogenic model Central Guizhou |
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