| 四川庙子毒重石-钡解石-钡白云石型钡矿床的成因 |
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| 引用本文：.1998.The genesis of the Miaoziwitherite –barytocalcite-barytodolomite deposit in Wanyuan City, Sichuan Province[J].Mineral Deposits,17(3):264~276 |
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| 基金项目:四川省科委重点科研项目（94-64） |
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| 中文摘要:庙子钡矿床是属于海底喷流热水沉积型毒重石-钡解石-钡白云石矿床。典型的海底喷流岩组合为毒重石岩+硅岩+硅质板岩+碳质板岩+灰岩，典型的海底喷流岩构造有角砾状、网脉状、气孔状、块状、层纹状、条带状等。钡矿石的主要组分为毒重石、钡解石、钡白云石。矿石的形成还与成岩早期有机质、细菌活动有着密切的关系。含矿岩系的岩石化学、微量元素、稀土元素地球化学特征表明硅岩、毒重石岩是在低能、缺氧、强还原条件下海底喷流热水沉积形成。钡矿形成环境为早寒武世麦地坪期扬子地台北部的陆棚边缘滞留盆地。 |
| 中文关键词:海底喷流热水沉积，毒重石-钡解石-钡白云石，四川庙子钡矿床 |
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| The genesis of the Miaoziwitherite –barytocalcite-barytodolomite deposit in Wanyuan City, Sichuan Province |
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| Abstract:Based on systematic studies, the authors have reached the conclusion that the Miaozibarium deposit belongs to witherite-barytocalcite-barytodolomite type of exhalative hydrothermal sedimentary origin. The typical assemblage of exhalativecherts is witherite (barytocalcite, barytodolom ite) + cherts+ siliceous slate+ carboniferous slate+ limestone and the typical fabrics include brecciated, stockwork, fumarolic, massive, laminated and striped structures. The barium deposit was formed in a stillwater basin on the continental margin of northern Yangtze platform at Early Cambrian Maidiping time. Ore minerals consist of witherite, barytocalcite and barytodolom ite. The formation of orebodies is also closely connected with organic and early diagenetic activities. The evidence of lithochemistry, trace elements and REE geochemistry of ore-bearing sequence suggests that exhalative cherts and witherite are of exhalative hydrothermal sedimentary origin in a low energy, anoxic and highly reduced environment. |
| keywords:Miaozibarium deposit, exhalative hydrothermal sedimentation, witherite-arytocalcite-barytodolomite |
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