| 左立波,王杰,任军平,孙凯,许康康,刘晓阳,龚鹏辉.纳米比亚金刚石矿床地质特征、矿床成因及找矿模型[J].地质找矿论丛,2015,30(S1):163-171 |
| 纳米比亚金刚石矿床地质特征、矿床成因及找矿模型 |
| Geological characteristics, genesis and prospecting model of diamond deposits in Namibia |
| 投稿时间：2015-09-22 |
| DOI：10.6053/j.issn.1001-1412.2015.S1.020 |
| 中文关键词: 金刚石 砂矿 矿床成因 找矿模型 纳米比亚 |
| 英文关键词:diamond placer deposit genesis prospecting model Namibia |
| 基金项目:中国地质调查局项目"非洲中南部重要矿床地质背景、成矿作用和找矿潜力研究"(编号:1212011220910)及国外风险勘查基金项目(编号:科[2011]D3-04)资助。 |
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| 中文摘要: |
| 纳米比亚金刚石资源丰富且品质优良,矿床类型以次生砂矿为主。文章对前人的大量研究成果进行分析总结,概述了纳米比亚金刚石矿床的区域地质背景,分析了金刚石矿床的地质特征及矿床成因。对纳米比亚金刚石包裹体氩-氩法定年分析发现,80%的包裹体熔蚀年龄<300Ma,表明大部分纳米比亚碎屑金刚石源自Dwyka期(<300Ma)以后的金伯利岩;纳米比亚金刚石以橄榄岩型(占比46%)和榴辉岩型(占比41%)为主,其余为二辉岩型或介于橄榄岩型-二辉岩型之间;纳米比亚橄榄岩型金刚石包裹体中石榴石-橄榄石平衡矿物的温度为961~1223℃,平均(1107±98)℃;石榴石-斜方辉石的平衡压力多为4.5~6.0GPa。纳米比亚金刚石的找矿有利地区主要为奥兰治河沿线及Oranjemund、卢得立次海岸地区,以次生金刚石砂矿为主。 |
| 英文摘要: |
| Namibia is abundant with placer-dominated and quality diamond resources. The authors analyze a lot of previous research results and summarize the regional geological background and characteristics and genesis of the deposits. 40Ar/39Ar dating data show fusion ages <300 Ma for 80% of the inclusions and indicate that most of Namibian detrital diamonds derive from kimberlites of Dwyka(<300 Ma) Period. Namibian diamond is mainly peridotitic type (about 46%) and eclogitic type (41%). The rest is websteritic type and the type between peridotitic and websteritic type. Garnet-olivine equilibrated at temperature 961-1 223 ℃(the average 1 107±98 ℃). The equilibrium pressure of garnet-orthopyroxene is generally 4.5-6.0 GPa. The best prospecting areas of diamond in Namibia are located mainly along the Orange River and Oranjemund, Luderitz coast area and focused on placer diamond. |
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