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四川甲基卡伟晶岩型稀有金属矿床的成矿时代及其意义 预览 被引量:44

40Ar/39Ar dating for the Jiajika pegmatite- type rare metal deposit in western Sichuan and its significance
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摘要 青藏高原东部是中国仅次于新疆阿尔泰的伟晶岩集中产出的地区之一,也是世界上重要的伟晶岩型稀有金属矿产资源产地,其中的甲基卡矿床是中国最大的伟晶岩型锂多金属矿床.由于地处高原,交通不便,对于该矿床的成因及相关科学问题缺乏系统的研究.根据野外调查和同位素年代学研究,获得的甲基卡稀有金属矿床 134号脉和 104号脉的 Ar- Ar法坪年龄分别为 (195.7± 0.1) Ma和 (198.9± 0.4) Ma,等时线年龄分别为 (195.4± 2.2) Ma和 (199.4± 2.3) Ma.这说明青藏高原东部甘孜-理塘一带的伟晶岩矿床形成于印支运动之后的燕山早期,属于印支旋回强烈造山运动之后相对稳定阶段的产物,或者说甲基卡式的伟晶岩型矿床形成于印支旋回板块碰撞造山运动向燕山-喜马拉雅旋回陆内造山运动演化的过渡时期.这种特点与国内外类似的伟晶岩型稀有金属矿床具有相似性. The eastern part of the Qinghai-Xizang plateau importance is only next to the Altay area in Xinjiang. (Tibet plateau) is an important area of pegmatite, and its It is also an important concentration area of rare metal resources, where the Jiajika rare metal deposit is the largest pegmatite-type Li-polymetal deposit in China. Few studies have been finished for its remote location at high mountains and extremely unconventional traffic. New ^40Ar/^39Ar ages of muscovite samples from the Jiajika rare metal pegmatite-type deposit are reported, based on field investigation and isotopic geochronology study. The muscovite samples from the No. 134 and No. 104 pegmatite veins give Ar-Ar plateau ages of (195.7±0. 1) Ma and (198.9±0. 4) Ma, isochron ages of (195.4±2.2) Ma and (199.4±2.3) Ma, reverse isochron ages of (195.4±1.9) Ma and (199.6±2. 1) Ma, respectively. This result suggests that the Jiajika pegmatite deposit formed at the early stage of Yanshanian, which is the relative stable period after the strong Indo-China movement. That is to say, this pegmatite rare metal deposit formed at the interim from the Indo-China movement of plate-collision-style to the Yanshanian movement of continental orogeny. Such feature is similar to many pegmatite-type rare metal deposits at home and abroad.
作者 王登红 李建康 付小方 Wang DengGong;Li JianKang;Fu XiaoFang
出处 《地球化学》 CAS CSCD 北大核心 2005年第6期 541-547,共7页 Geochimica
基金 国家重点基础研究发展计划(973计划),国家"火炬计划",中国地质调查局地质调查项目
关键词 Ar-Ar同位素定年 伟晶岩型矿床 稀有金属 印支运动 甲基卡 青藏高原 Ar-Ar isotopic dating pegmatite-type deposit rare metal Indo-China movement Jiajika Qinghai-Xizang plateau (Tibet plateau)
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参考文献16

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