湘北地区奥陶系含钾岩石成矿模式及找矿标志

2021-01-15 12:24:40魏义斌
国土资源导刊 2021年4期

摘 要 含钾岩石是指含有不同程度的钾元素、且均属含硅酸盐矿物的非水溶性钾的岩石,可用于制造钾肥(硫酸钾、碳酸钾、钾钙肥)、钙镁磷钾肥、钙镁钾肥等复合肥料以及土壤调理剂(或土壤活化剂)等。随着科学技术飞速发展,现在国内在开发利用含钾岩石试制钾肥的综合利用研究工作方面硕果累累,生产技术日趋成熟。湘北地区含钾岩石分布广泛,加强综合开发利用以补充钾肥资源的不足变得很重要。本文简述了湘北地区奥陶系含钾岩石的成矿模式及找矿标志。

关键词 湘北;含钾岩石;成矿模式;找矿标志

中图分类号:P624.6 文献标识码:A

Ordovician Potassium-Bearing Rocks in Northern Hunan  Metallogenic Models and Prospecting Markers

Wei Yibin

(Team 403, Bureau of Geology and Mineral Exploration and Development of Hunan Province, Changde Hunan 415000)

Abstract: Potassium bearing rock refers to the rock containing different degrees of potassium element and are not water-soluble potassium containing silicate minerals. It can be used to manufacture potash fertilizer (potassium sulfate, potassium carbonate, potassium calcium fertilizer), calcium magnesium phosphate potassium fertilizer, calcium magnesium potassium fertilizer and other compound fertilizer, as well as soil conditioning agent (or soil activator). With the rapid development of science and technology, in the aspect of development and utilization of potassium-bearing rock trial-made comprehensive utilization of potassium-bearing rock, research achievements are got, production technology is increasingly mature. Potassium-bearing rocks are widely distributed in the northwest of Hunan, so it is important to strengthen their comprehensive exploitation and utilization to supplement the deficiency of potassium fertilizer resources.A brief account of the metallogenic model and prospecting criteria of the ordovician potassium-bearing rocks in the northwest area of Hunan, is shown in this paper.

Keywords: northwest Hunan; potassium-bearing rocks; metallogenic models; prospecting marker

我国土壤普遍缺钾,特别是可溶性钾盐资源严重不足。我国也加强了钾矿勘探,特别是国外资源的勘探及收购,同时加强了不溶性钾矿综合利用的研究。现在国内科研部门在开发利用非水溶性钾岩试制钾肥的综合利用研究工作方面硕果累累。湘北地区奥陶系非水溶性含钾岩石资源丰富, 对其巨大的资源进行勘探、开发和利用,将有效缓解钾肥供应的紧张局面,为我国战略性资源储备寻求可靠的保障。

1 成矿地质背景

湘北地区(慈利、石门、澧县)位于羌塘-扬子-华南板块(Ⅳ、一级构造单元)、扬子陆块(Ⅳ-4、二级构造单元)、湘北断褶带(Ⅳ-4-5、三级构造单元)、石门-桑植复向斜(Ⅳ-4-5-1、四级构造单元),见图1。

区域主要出露地层有冷家溪群、板溪群、南华系、震旦系、寒武系、奥陶系、志留系、泥盆系、二叠系、三叠系、侏罗系、白垩系及第四系,总厚度大于7 895.4 m。……

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