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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Mineralogical and geochemical studies of boron-rich bauxite ore deposits in the Songqi region, SW Henan, China
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Mineralogical and geochemical studies of boron-rich bauxite ore deposits in the Songqi region, SW Henan, China

机译：河南西南松溪地区富硼铝土矿床的矿物学和地球化学研究

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The Songqi region, SW Henan, is an important bauxite province in China. The bauxite ore deposits occur unconformably on the top of Middle Ordovician argillaceous carbonates. The bauxite ores from the Songqi re gion are characterized by unusually high boron contents. In this paper, we report the mineralogical and chemical compositions of selected bauxite ores from the region. These new data, together with existing geo chemical data of soils in the region, are used to evaluate the origin of boron enrichment in the bauxite ores. The compositional characteristics of tourmaline in the bauxite ores suggests that this mineral was likely derived from a meta-sedimentary protolith. Mass balance calculation reveals that tourmaline only accounts for a small portion of boron in the bauxite ores; the majority of boron in the ores must occur in other forms, possibly by ion absorption on the surfaces of diaspore and clay minerals. In the Songqi region, the Precambrian meta-sedimentary rocks are known to contain abundant tourmalines whereas the Cambrian-Ordovician argillaceous carbonates and the Upper Proterozoic shales are all enriched in boron in free ion state. We suggest that these rocks provided tourmaline and boron ion to the bauxite deposits in the region. Most known bauxite deposits in the Songqi region occur at the margins of boron-rich soil domains, suggesting that boron in soils is a potential exploration indicator for unknown bauxite deposits in this region.
机译：河南西南的松岐地区是中国重要的铝土矿省。铝土矿床不一致地出现在中奥陶纪的泥质碳酸盐岩顶部。松岐地区的铝土矿的特征是硼含量异常高。在本文中，我们报告了该地区精选铝土矿矿石的矿物学和化学组成。这些新数据与该地区土壤的现有地球化学数据一起，用于评估铝土矿中硼的富集来源。铝土矿矿石中电气石的组成特征表明，该矿物很可能是由沉积的原生沉积岩衍生而来的。质量平衡计算表明，电气石在铝土矿中仅占硼的一小部分。矿石中的大多数硼必须以其他形式存在，可能是通过在水硬岩和粘土矿物表面上的离子吸收造成的。在松岐地区，已知前寒武纪准沉积岩含有丰富的电气石，而寒武纪-奥陶纪的泥质碳酸盐岩和上元古代的页岩都富含游离离子态的硼。我们认为这些岩石为该地区的铝土矿提供了电气石和硼离子。松岐地区最著名的铝土矿床发生在富硼土壤区域的边缘，这表明土壤中的硼是该地区未知铝土矿床的潜在勘探指标。

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