投稿时间：2022-07-22
修订日期：2023-03-06
网络发布日期：2023-05-06
中文摘要:为了总结扬子地块边缘造山带内中生代锂铍铌钽钨锡矿床的成矿规律和找矿方向，明确板块作用对稀有金属成矿的时空约束，文章以川西马尔康、湘南骑田岭和陕东南镇安矿田为实例，开展构造背景、成岩成矿时代、岩石地球化学等方面的对比分析，结果显示，不同的稀有金属矿田具有相对一致的地质地球化学特征。构造背景均属于碰撞造山晚期相对稳定或造山期后初始伸展阶段；成岩成矿时代相对集中于印支晚期—燕山早期和燕山中晚期；与稀有金属成矿有关的花岗岩均具有高分异、弱过铝质、钙碱性特征，多属于碱长花岗岩—正长花岗岩类。地质年代学的相近性及构造背景的相对一致性，表明扬子地块边缘造山带内的中生代稀有金属成矿明显地受扬子地块相对统一的构造活动约束；板块边缘不同造山带内的优势稀有金属矿种、主成矿时代、与成矿有关花岗岩的地球化学特征等可互为参考，以促进扬子地块边缘松潘-甘孜、南秦岭、华南等造山带内稀有金属矿的找矿勘查。
Abstract:In order to summarize the metallogenic regularity of Mesozoic lithium, beryllium, niobium, tantalum, tungsten-tin deposits in the margin orogenic belt of Yangtze Block, clarify the prospecting direction of this type of rare metal deposits, and clarify the temporal and spatial constraints of the plate action for rare metal mineralization, we take the Maerkang ore field in Songpan-Ganzi orogenic belt of the western Sichuan, the Qitianling ore field in South China intracontinental orogenic belt of the Southern Hunan and the Zhen'an ore field in South Qinling orogenic belt as the main research objects, to carry out comparative analysis on tectonic setting, magmatic-metallogenic epoch and lithogeochemistry etc. The study shows that this kind of rare metal ore deposits formed in a tectonic setting of relatively stable late collisional orogeny, or initial extensional post-orogenic stage; The magmatic and metallogenic ages are mainly late Indosinian to early Yanshanian and middle-late Yanshanian. The granites associated with rare metal mineralization are characterized by high differentiation, weak peraluminous and calc-alkaline, which are mostly distributed in alkali feldspar granite or syenogranite on QAP diagram, the geochemical characteristics of the rocks can be quantitatively described. It is preliminarily concluded that the Mesozoic rare metal mineralization in each margin orogenic belt is obviously constrained by the unified tectono-magmatic evolution of the Yangtze block. The dominant ore species in different orogenic belts, main metallogenic ages and geochemical characteristics of granites related to mineralization can be mutually referenced to further expand the rare metal prospecting of the Songpan-Ganzi orogenic belt, South Qinling orogenic belt and South China orogenic belt.
文章编号：
中图分类号：
文献标志码：
基金项目:本文得到中国五矿集团有限公司科技专项项目“南岭成矿带深部成矿预测与找矿示范”（编号：2021ZXB01）、国家重点研发计划项目我国西部伟晶岩型锂等稀有金属成矿规律与勘查技术（编号：2021YFC2901900）、西部伟晶岩型粘土型锂等稀有金属成矿规律与潜力评价（编号：2021YFC2901905）和中国矿产地质志续编与产品服务（2022-2024）（编号：DD20221695）联合资助
引用文本：
马圣钞,王炯辉,王登红,何从行,江军华,武将伟,杜玉龙.2023.扬子地块边缘造山带中生代稀有金属矿田地质地球化学特征及找矿方向——以川西马尔康、湘南骑田岭和陕东南镇安矿田为例[J].矿床地质,42(2):425~443MA ShengChao,WANG JiongHui,WANG DengHong,HE CongXing,JIANG JunHua,WU JiangWei,DU YuLong.2023.Geological and geochemical characteristics and prospecting direction of Mesozoic typical rare metal ore fields within orogenic belts at margin of Yangtze Block: A case study of Maerkang ore field in West Sichuan, Qitianling ore field in South Hunan and Zhen’ an ore field in Southeast Shaanxi[J].Mineral Deposits42(2):425~443
图/表
