| 吴小伟,纪冬平,陶朴.陕西汉中地区磷矿地球化学特征及成因探讨[J].矿产勘查,2023,14(3):459-470 |
| 陕西汉中地区磷矿地球化学特征及成因探讨 |
| Geochemical characteristics and genesis of phosphate deposits in Hanzhong, Shaanxi |
| 投稿时间：2022-09-11 |
| DOI：10.20008/j.kckc.202303011 |
| 中文关键词: 磷矿类型 地球化学特征 成矿模式 汉中 陕西 |
| 英文关键词: phosphate deposit type geochemical characteristics metallogenic model Hanzhong Shaanxi |
| 基金项目:本文受陕西省自然科学基础研究计划项目:陕西省宁强县中坝一带下寒武统黑色岩系多金属找矿研究(2021JQ-985)资助。 |
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| 中文摘要: |
| 陕西汉中地区位于扬子克拉通西北缘,是中国重要的磷矿分布地区,赋矿层位主要为下震旦统陡山沱组和下寒武统牛蹄塘组,为探讨该地区磷矿的成矿物质来源、沉积环境及其成矿模式,本文选取汉中地区新铺磷矿、宽川铺磷矿和阳平关磷矿开展了岩石地球化学研究。结果表明,新铺磷矿赋存于下震旦统陡山沱组,为正常陆源碎屑沉积,成矿物质来源于碧口古陆基性火山岩区,磷矿形成于氧化/还原沉积环境分界位置。宽川铺和阳平关磷矿赋存于下寒武统牛蹄塘组,磷矿沉积时有基性岩浆成因热水物质的加入,沉积环境为缺氧的还原环境。综合研究表明,扬子克拉通西北缘存在两种不同成因类型的磷矿,两者在物质来源、沉积环境及成矿模式方面显著不同。研究结果对验证、充实磷矿成矿理论及该区域指导找矿实践具有积极意义。 |
| 英文摘要: |
| Hanzhong area in Shaanxi Provence, located in northwestern margin of Yangtze Craton, is an important phosphate ore distribution in China. The phosphate orebodies are mainly hosted the Lower Sinian Doushantuo Formation and the Lower Cambrian Niutitang Formation. In this paper, we present geochemical features of ores and host rocks in Xinpu, Kuanchuanpu and Yangpingguan phosphate deposits in Hanzhong area to study their material source, sedimentary environment and ore genesis. The results show that the Xinpu deposit is hosted in the Lower Sinian Doushantuo Formation, which is a normal terrigenous clastic deposit. The ore-forming material originated from the ancient land basic volcanic rock area, the deposit was formed at the boundary of oxidation/reduction sedimentary environment. Kuanchuanpu and Yangpingguan deposits are hosted in the Lower Cambrian Niutitang Formation, When the phosphate deposits were deposited, basic magmatic hot water materials were added, and the sedimentary environment was anoxic reducing environment. The differences in ore-forming material source, sedimentary environment and ore genesis model between Xinpu and Kuanchuanpu, as well as Yangpingguan deposit, indicate that there are two different types of phosphate deposit in the northwestern margin of Yangtze Craton. The research results are of positive significance to verify and enrich the phosphorite mineralization theory and guide the prospecting practice in this region. |
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