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为了确定滑石矿床的矿物学及地球化学分散性质,研究了上覆于该矿床和头生角闪石围岩的土壤剖面,提出了勘查热带地质体中工业矿物的有效方法。矿物学分析表明,在滑石矿体上覆的土壤中,滑石仍是土壤的主要成分,与石英、绿泥石、伊利石和针铁矿共生。而在角闪岩风化土壤中,大多数原生矿物都已分解成高岭土、石英和针铁矿。与母岩相比土壤中的化学成分富Fe_2O_3、Al_2O_3,贫Na_2O、K_2C、CaO、MgO和FeO。微量元素丰度显示了不一致的模式:Ni、Co丰度较母岩低,而Zn、Cu则高。尽管热带环境具有强烈风化的特征,但是土壤中MgO的高含量似乎是土壤覆盖层下存在滑石矿床的唯一可靠的地球化学指示。MgO含量的分析结合土壤的x-射线衍射分析可作为一种探测深部滑石矿床的极有效的方法。
In order to determine the mineralogical and geochemical dispersion properties of the talc deposit, the soil profile overlying the deposit and the hornblende surrounding rock was studied, and an effective method for prospecting industrial minerals in tropical geology was proposed. Mineralogical analysis shows that talc is still the major component of soils in the overlying soils of talc and coexists with quartz, chlorite, illite and goethite. In the amphibolite weathered soils, most of the primary minerals have been decomposed into kaolins, quartz and goethite. Compared with the parent rock, the chemical composition of the soil is rich in Fe_2O_3, Al_2O_3, poor Na_2O, K_2C, CaO, MgO and FeO. The abundance of trace elements shows an inconsistent pattern: the abundance of Ni, Co is lower than that of parent rock, while that of Zn and Cu is high. Despite the intensely weathered nature of the tropical environment, the high content of MgO in the soil appears to be the only reliable geochemical indicator of the presence of talc deposits under the soil cover. The analysis of MgO content combined with x-ray diffraction analysis of soils can be used as a very efficient method for detecting deep talc deposits.