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新疆金刚石原生矿成矿地质条件及其找矿方向 总被引:5,自引:1,他引:4
塔里木地台是我国寻找原生金刚石矿较有远景的地区之一。通过对塔里木地台及其周边4个古老陆块成矿地质条件的分析以及与国内外已知原生金刚石矿床产出地质条件的对比研究,指出新疆塔里木周边的库鲁克塔格-星星峡、铁克力克、阿尔金和柯坪4个断降具有寻找原生金刚石矿的前景,提出在上述4个地区开展原生金刚石矿的具体找矿工作建议。 相似文献
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初论金刚石原生矿庆成矿系列 总被引:1,自引:0,他引:1
目前所知产金刚石的岩石类型包括金伯利岩、钾镁煌斑岩、榴辉岩、蛇绿岩套、碱性超基性杂岩、碱性超基性煌斑岩和橄榄岩类(方辉橄榄岩、纯橄榄岩等)等偏碱性超镁铁质岩石,而有经济价值的金刚石原生矿床仅见于伯利岩和钾镁煌斑岩中,除此之外的其他岩石类型中仅见有少量微粒金刚石,金伯利岩和钾镁煌斑岩都起源于地幔深部,就此意义上讲,二者是同源的,但其岩石化学成分、主要矿物组成、产出大地构造背景以及同位素资料等,存在阗 相似文献
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在金刚石原生矿预测研究中应用模糊数学中的相似性优选和综合评判方法取得了好的效果。相似性优选主要利用定量数据并可直接用汉明距离求出规格化对比方阵,综合评判方法可以同时把定量和定性数据都纳入四个综合评判模型,若有必要还可以继续进行二级综合评判。在进行综合评判时必需考虑元素在岩体中的分布模型,若使用常量元素分析结果,则直接用原始数据,若为微量元素分析结果则先对原始数据先取对数。再根据样品数的多少分别选用格贴近度(N>5)和中间型隶属函数(N≤5)求值,若为其它的定性数据则采用其它相应的隶属函数求值,在此基础上再进行综合评判。笔者在实际应用时以综合结果为主,参考相似性优选结果进行选点,只利用岩石化学分析结果就获得了十分理想的效果,选出的第一点取样经鉴定即为钾镁煌斑岩。 相似文献
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Characteristics of the Geotectonics in South China and Their Constraints on Primary Diamond
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TANG Wenquan BAO Chaomin Geological Society of Zhejiang Province Hangzhou Zhejiang 《Acta Geologica Sinica》2000,74(2):217-222
The Asian continent is one of the best places in the world to study continental dynamics. In this region the tectonic framework of the South China plate is related to the activity of the Pacific plate and Indian plate since the Mesozoic. In the South China plate, as the ophiolitic melange of the middle Proterozoic in the Shaoxing-Yingtan-Tengxian-Beihai faulted zone was confirmed to be a subducting ocean, the evolution of the Yangtze block and Cathaysian block, which are located on both sides of the fault zone, becomes clearer and clearer. A primary diamond deposit, which was first found by Bao Chaomin and his colleagues in Longyou County of Zhejiang Province in 1998, originated from kimberlitoid pipes. The pipes are located in the Cretaceous basin beside this deep fault and the diamond-bearing pipe was formed deep within a favourable geological structure. Diamond there occurs as octahedral crystals without visual impurities. There are more than 100 similar pipes in the area, which have been poorly stud 相似文献
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