| 李杭,高爱奎,严城民,雷星,倪光清,黄昌键,陈宝林,李炫.花岗岩风化壳pH值特征及其对稀土矿体的控制作用——以滇西南大同山风化壳离子吸附型稀土矿为例[J].矿产勘查,2026,17(S1):36-46 |
| 花岗岩风化壳pH值特征及其对稀土矿体的控制作用——以滇西南大同山风化壳离子吸附型稀土矿为例 |
| pH characteristics of granite weathering crust and its controlling effect on rare earth ore bodies：A case of weathering crust of Datong Mountain in southwest Yunnan |
| 投稿时间：2026-01-11 修订日期：2026-03-10 |
| DOI：10.20008/j.kckc.2026S1005 |
| 中文关键词: 花岗岩风化壳 pH值特征 稀土矿体 控制作用。 |
| 英文关键词: granite weathering crust pH value characteristics rare earth ore body control action |
| 基金项目:本文受云南省地质勘查基金项目（K202102）资助。 |
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| 中文摘要: |
| 矿区位于临沧花岗岩中南段，主体部分为结构不同的三叠纪黑云母二长花岗岩，次为二叠纪花岗闪长岩、英云闪长岩。该区为中浅切割的低中山地貌区，风化壳自上而下划分为腐殖层、黏土层、全风化层、半风化层，矿体产于全风化层中。为查清风化壳pH值特征及其对稀土矿体的控制作用，本文在矿区有代表性的7个钻孔中系统进行了pH值测试。通过研究得出2点具有创新性的重要结论：① 风化壳剖面的pH值在纵剖面上：自上而下，风化程度变低，pH值变大，酸性程度减弱。在横剖面上：地形剥蚀程度越大，pH值数值越大，酸性程度越弱；② 钻孔的pH值越大，矿体产出层位越高，矿体厚度越薄。根据矿体产出层位，钻孔可划分为3种类型：产于全风化层上部的钻孔，产于全风化层中上部的钻孔，产于全风化层下部的钻孔。查明花岗岩风化壳pH值特征及其对稀土矿体的控制作用，对临沧花岗岩分布区风化壳离子吸附稀土矿的找矿勘查、成矿作用、成矿预测的研究，提供了参考依据。 |
| 英文摘要: |
| The mining area is located in the middle and south section of Lincang granite， the main part of which is the Triassic biotite monzonitic granite with different structures， the secondary is Permian granodiorite and quartz diorite. This area is a middle-shallow cut low-middle-mountain landform area， and the weathering crust is divided into humus layer， clay layer， full regolith and half regolith from top to bottom， and the ore body occurs in the full regolith. In order to find out the pH characteristics of weathering crust and its controlling effect on rare earth ore bodies， the pH values were tested systematically in 7 boreholes representative of the mining area. Two innovative and important conclusions are drawn through the study： ① The pH value of the weathering crust section is in the longitudinal section： from top to bottom， the degree of weathering decreases， the pH value increases， and the degree of acidity decreases. In the cross section， the greater the degree of terrain denudation， the greater the pH value and the weaker the acidity； ② The higher the pH value of the borehole， the higher the production level of the ore body and the thinner the thickness of the ore body. Boreholes can be divided into three types according to the production horizon of the ore body： boreholes in the upper part of the total regolith， boreholes in the upper part of the total regolith， and boreholes in the lower part of the total regolith. The investigation of the pH value characteristics of the granite weathering crust and its control over rare earth ore bodies provides a reference basis for the research on prospecting and exploration， mineralization processes， and mineralization prediction of ion-adsorption rare earth ores in the weathering crust of the granite distribution area in Lincang. |
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