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首页> 外文期刊>Chinese science bulletin >Strontium isotopic signature of hydrothermal sedimentation from Early Cambrian barite deposits in east
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Strontium isotopic signature of hydrothermal sedimentation from Early Cambrian barite deposits in east

机译：东部早寒武世重晶石矿床热液沉积的锶同位素特征。

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The ore genesis model for barite deposits in east Guizhou Province has been in dispute and the major debate focuses on whether they are product of the submarine hydrothermal sedimentation. This note presents new strontium isotope data from 19 samples of Dahebian and Yuping barite deposits, and their 87Sr/86Sr ratios are significantly lower than that of the coeval seawater. The 87Sr/86Sr ratios of 17 samples out of 19 samples rang from 0.708310 to 0.708967, indicating that they might be related to the mantel admixture. Two isotopic ratios in this study are higher than those of coeval seawater (0.7090), collected from late-stage barite mineral vein of interpenetrative strata and a barite nodule bearing hypidiomorphic granular pyrite, which indicates that they might be related to the continental admixture. The study provides Sr isotopic evidence not only for the submarine hydrothermal exhalative genesis of Dahebian and Yuping barite deposits, but also for distinguishing the barite mineralization of late stage.
机译：贵州东部重晶石矿床的成因模型一直存在争议，主要的争论集中在它们是否是海底热液沉积的产物上。本文介绍了来自大河边和玉屏重晶石矿床的19个样品的新锶同位素数据，其87Sr / 86Sr比值明显低于同期海水。 19个样品中的17个样品的87Sr / 86Sr之比在0.708310到0.708967之间，表明它们可能与壁炉架外加剂有关。本研究中的两个同位素比值高于同年龄海水的同位素比值（0.7090），该值是从互穿地层的晚期重晶石矿物脉和含亚同型粒状黄铁矿的重晶石结核中收集的，这表明它们可能与陆相混合有关。该研究不仅为大河边和玉屏重晶石矿床的水下热液呼出作用提供了Sr同位素证据，而且为后期晚期重晶石的成矿提供了证据。

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