试对贵州贵定平伐泥盆系碎屑岩金刚石信息的思考  

Information of Diamond Hosted in Devonian Clastic Rocks in Pingfa Area,Guiding County,Guizhou Province: a New Perspective

作　　者：杨光忠[1] 

机构地区：[1]贵州省地矿局101地质大队,贵州凯里556000

出　　处：《地质论评》2018年第2期450-456,共7页Geological Review

基　　金：贵州省地矿局“贵州钾镁煌斑岩特征、时代与金刚石成矿条件研究”和“施秉下翁哨地区镁铝榴石重砂异常及其矿物学研究”的成果.

摘　　要：本文根据贵定平伐地区水系砂矿金刚石和泥盆系碎屑岩金刚石信息,结合黔东钾镁煌斑岩乃至华北地台金刚石成矿于奥陶纪(末)的时间域,贵州地史演化特征和此时都匀运动的地质构造格架,综合分析认为,仍处海相沉积建造进程中的黔东有一系列(含金刚石)钾镁煌斑岩侵入,作为上扬子地台中相对刚性的黔中隆起块体,应更利于钾镁煌斑岩型甚至金伯利岩型金刚石的成矿,贵定平伐泥盆系碎屑岩金刚石或许就是来源于黔中隆起区原生金刚石矿的剥蚀扩散补给,并因此相伴形成碎屑岩区水系砂矿金刚石及其指示矿物的重砂异常。Based on the fact that the lamproites emplacement time in the eastern Guizhou area and diamond mines-forming time in the North China craton are in the Late Ordovician, coupling with the geological structure of Duyun Movement and the feautures of geological history of Guizhou, a conclusion is made that as a relative rigid block in the Upper Yangtze Platform, Central Guizhou Block is a better place to form lamproite-type diamond mine even the kimberlite-type diamond mine, considering that many lamproites emplacement activities existed in the eastel~ Guizhou area which at the same time marine sedimentary formations were formed. Possibly, the placer hosted diamonds in the Pingfa area, Guiding county, come from the supply of diamond primary mineral in the Central Guizhou Uplift. In the clastic rocks, thus, placer hosted diamonds of rivers and placer anomalies of index minerals are formed.

关 键 词：金刚石 泥盆系碎屑岩 都匀运动 黔中隆起 贵州 

分 类 号：P619.241[天文地球—矿床学]