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贵州罗甸玉矿及邻近花岗岩锆石u-pb定年
首发时间：2021-12-23
摘要：软玉结构细腻、副矿物极少，一般不具备锆石u-pb定年的先决条件；另一方面，软玉的k、rb、sr含量很低，也难以利用全岩k-ar法、ar-ar法和rb-sr等时线测年法，因而软玉矿定年一直是矿床学研究的难题。长期以来，软玉矿的成矿时代主要依赖于野外地质关系进行概略推断，有时可能得出重大的错误结论。本次研究在罗甸软玉中成功挑选出热液锆石，获得la-icp-ms锆石u-pb年龄为86.9±2.0ma，与矿体附近的花岗岩脉年龄（86.0±0.6ma）在误差范围一致，说明罗甸玉成矿与该期花岗岩浆侵入活动有关，从而将罗甸玉的成矿年龄限定在86ma，改变了罗甸玉是海西晚期基性岩浆接触交代而成的认识。
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zircon u-pb dating of the luodian nephrite deposit and its adjacent granites in guizhou province
abstract：nephrite has a fine structure and very few accessory minerals, and generally does not possess the condition of zircon u-pb dating. on the other hand, the content of k, rb and sr in nephrite is very low, and it is difficult to use the whole-rock k-ar method, ar-ar method and rb-sr isochronal dating method, so the dating of nephrite has always been a difficult problem in ore deposit study. for a long time, metallogenic age of nephrite ore mainly depends on the general inference of the field geological relationship, which may sometimes lead to significant wrong conclusions. in this study, hydrothermal zircon was successfully selected from luodian nephrite, la-icp-ms zircon u-pb age was 86.9±2.0ma, which was consistent with the age of the granite dike (86.0±0.6ma) near the ore body within the error range, indicating that the minezircon u-pb dating of the luodian nephrite deposit and its adjacent granites in guizhou provinceralization of luodian nephrite is related to the intrusion of granitic magma in this period, thereby, the metallogenic age of luodian nephrite is limited to 86 ma, which changes the viewpoint that luodian nephrite was formed by contact metasomatism of late hercynian basic magma.
keywords： zircon u-pb dating luodian nephrite granite dike guizhou province
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