西澳Darling Range地区铝土矿特征及成矿控制因素
发布时间：2018-09-17 11:59
【摘要】：我国铝土矿资源相对匮乏,但需求量大。澳大利亚铝土矿资源丰富,是我国铝土矿进口主要国家之一。Darling Range地区为澳大利亚铝土矿主产地之一,了解该区的铝土矿成矿特征将有助于我国企业走出去在该地区或相似地区找矿提供依据。Darling Range位于西澳大利亚的伊尔岗克拉通,该区铝土矿以红土型为主,铝土矿的显著特点是品位较低,铁、硅含量高,但对铝土矿冶炼有害的可溶性硅含量低,资源潜力巨大。铝土矿产于红土层中,厚度受后期剥蚀作用控制。红土剖面从上到下依次分为覆盖层、硬壳、碎屑层和底部粘土层。覆盖层以砂砾为主,具有经济意义的铝土矿主要集中在碎屑层和硬壳中,底部粘土层则阻止铝土矿继续向下运移。铝土矿中的矿石矿物主要是三水铝石,也有少量一水软铝石,主要由花岗岩或基性岩(如辉绿岩、绿岩)中的长石经过风化淋滤形成。Darling Range地区铝土矿根据基岩的种类可分为花岗岩类铝土矿和镁铁质类铝土矿,分别以Jarrahdale铝土矿矿床和Mount Saddleback铝土矿矿床为代表。铝土矿的成矿主要受气候、母岩、地貌、排水和植被等因素控制。气候主要通过控制气温和降水影响红土化作用的进行;母岩通过自身的物理化学性质和矿物组成控制铝土矿的形成;地貌和排水影响铝土矿的风化速度;植被的作用既保证了土壤风化淋滤所需的渗透性,又降低了外部因素对土壤的侵蚀速率。在各种成矿因素的综合作用下,经过漫长的时间演化最终形成了红土型铝土矿。
[Abstract]:The bauxite resources in our country are relatively scarce, but the demand is large. Australia is rich in bauxite resources and is one of the main import countries of bauxite in China. Darling Range is one of the main producing areas of bauxite in Australia. The obvious characteristics of bauxite are low grade, high iron and silicon content, but low soluble silicon content harmful to bauxite smelting, and great resource potential. Bauxite occurs in laterite and its thickness is controlled by late denudation. The laterite profile is divided into overburden layer, hard crust layer, clastic layer and bottom clay layer from top to bottom. The bauxite with economic significance is mainly concentrated in the clastic layer and the hard crust, while the bottom clay layer prevents the bauxite from moving downward. The ore minerals in bauxite are mainly gibbsite, but also a small amount of boehmite, mainly composed of granite or basic rocks (such as diabase, The feldspar in the greenstone can be divided into granite bauxite and mafic bauxite, represented by Jarrahdale bauxite deposit and Mount Saddleback bauxite deposit, according to the type of bedrock. The mineralization of bauxite is mainly controlled by climate, parent rock, geomorphology, drainage and vegetation. The effect of vegetation not only ensures the permeability of soil weathering and leaching, but also reduces the rate of soil erosion caused by external factors. Under the comprehensive action of various metallogenic factors, the lateritic bauxite was formed after a long time evolution.
【作者单位】： 中国地质大学(北京)地球科学与资源学院;国土资源部成矿作用与资源评价重点实验室中国地质科学院矿产资源研究所;
【基金】：国家地质大调查资助项目(编号:1212011120325)的成果~~
【分类号】：P618.45
，
本文编号：2245845
[Abstract]:The bauxite resources in our country are relatively scarce, but the demand is large. Australia is rich in bauxite resources and is one of the main import countries of bauxite in China. Darling Range is one of the main producing areas of bauxite in Australia. The obvious characteristics of bauxite are low grade, high iron and silicon content, but low soluble silicon content harmful to bauxite smelting, and great resource potential. Bauxite occurs in laterite and its thickness is controlled by late denudation. The laterite profile is divided into overburden layer, hard crust layer, clastic layer and bottom clay layer from top to bottom. The bauxite with economic significance is mainly concentrated in the clastic layer and the hard crust, while the bottom clay layer prevents the bauxite from moving downward. The ore minerals in bauxite are mainly gibbsite, but also a small amount of boehmite, mainly composed of granite or basic rocks (such as diabase, The feldspar in the greenstone can be divided into granite bauxite and mafic bauxite, represented by Jarrahdale bauxite deposit and Mount Saddleback bauxite deposit, according to the type of bedrock. The mineralization of bauxite is mainly controlled by climate, parent rock, geomorphology, drainage and vegetation. The effect of vegetation not only ensures the permeability of soil weathering and leaching, but also reduces the rate of soil erosion caused by external factors. Under the comprehensive action of various metallogenic factors, the lateritic bauxite was formed after a long time evolution.
【作者单位】： 中国地质大学(北京)地球科学与资源学院;国土资源部成矿作用与资源评价重点实验室中国地质科学院矿产资源研究所;
【基金】：国家地质大调查资助项目(编号:1212011120325)的成果~~
【分类号】：P618.45
，
本文编号：2245845
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