黔东南钾镁煌斑岩地球化学特征及指示意义
Geochemical characteristics of lamproites in the Southeastern Guizhou and their indicative significances
查看参考文献34篇
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文摘
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因在黔东南镇远马坪地区钾镁煌斑岩中发现我国第1个原生金刚石岩体,黔东南钾镁煌斑岩受到广泛关注。本文通过对近年来新发现的黔东南施秉大坪、镇远马坪及麻江石板寨地区钾镁煌斑岩地球化学主微量元素特征分析,对本地区地幔源区性质、构造演化特征及大陆动力学特征进行探讨。结果表明,主量元素特征显示其SiO_2、Al_2O_3、CaO、Na_2O、K_2O和P_2O_5含量均归属典型钾镁煌斑岩;微量元素地球化学特征显示,各岩体强烈富集高场强元素(Th、Nb、Ta和U),并明显亏损大离子亲石元素(Rb、K、Sr)和Ti;稀土元素地球化学特征表明,稀土总量相对较高(ΣREE=797×10~(-6)~1488×10~(-6)),且具有明显轻稀土元素富集和重稀土元素亏损特征((La/Yb)_N=112~254)。微量元素及稀土元素对比值显示,岩石在形成过程主要经历母岩浆的分离结晶作用,岩浆在上升过程未受到明显地壳混染作用影响,岩浆源区为大于100 km的石榴子石二辉橄榄岩地幔。地球动力学分析显示,黔东南钾镁煌斑岩产于稳定的克拉通非造山的大陆动力学背景下,受到扬子板块与华夏板块在奥陶纪末-志留纪发生板内造山作用,再在中二叠世-晚二叠世,经历东吴运动的影响,再经历燕山运动期江南造山带之燕山期板内造山亚带和特提斯域地质构造演化的共同影响。本区具备金刚石稳定生长的条件:1)有稳定的构造单元(扬子古陆与华夏古陆);2)钾镁煌斑岩成岩深度达到了金刚石稳定深度;3)区域上有深切岩石圈地幔的大断裂作为岩浆上升的通道。但有利区可能遭受剥蚀,后期找矿过程中重点关注剥蚀程度较小的断裂的下降盘或未经抬升的加里东期的古地面等区域。 |
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其他语种文摘
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The lamproites in the Southeastern Guizhou have been widely concerned due to the discovery of China's first original diamond-bearing lamproite body in the Maping area, Southeastern Guizhou. Based on analyzing the geochemical characteristics of major and trace elements of lamproites found recently in the Daping area of Shibing County, Maping area of Zhenyuan County, and Shibanzhai area of Majiang County in the southeastern Guizhou, the characteristics of mantle source, tectonic evolution, and crustal dynamics in the southeastern Guizhou have been discussed in this paper. The characteristics of major elements (SiO_2, Al_2O_3, CaO, Na_2O, K_2O and P_2O_5) of our samples show that they all belong to typical lamproite. The geochemical characteristics of trace elements show that our samples are strongly emriched of HFSE (Th, Nb, Ta, and U), but depleted in LILEs (Rb, K, Sr) and Ti. The REE geochemical characteristics show that samples have relatively high contents of total REE (ΣREE=797×10~(-6)-1488×10~(-6)), with obvious characteristics of enriched LREE but depleted HREE ((La/Yb)_N=112-254). The elemental pair ratios of trace elements and REE indicated that the lamproites in the Southeastern Guizhou could be formed by the fractional crystallization of parent magma, which was derived from garnet buchnerite mantle lower than 100km in depth, with no noticeable crustal contamination in the uplift process of magma. Geodynamic analysis shows that the lamproites in the Southeastern Guizhou occurred in a non-orogenic continental dynamic setting of stable craton which were jointly influenced by the intercontinental orogeny between the Yangtze and Cathay plates from the Late Ordovician to Silurian, the Dongwu orogeny from the Middle to Late Permian, the Yanshanian Jiangnan intraplate orogeny, and the geotectonic evolution of Tethys tectonic domain. The favorable conditions for the diamond-bearing lamproites in the area are given below. 1) There are stable tectonic units (the Yangtze and Cathay blocks) for a long time; 2) The lamproite magma was formed at depth deep enough for the diamond stabilization; 3) There is deep fracture cutting through the lithospheric mantle as the magma uplifting channel. However, the beneficial part of lamproites for prospecting diamond might be eroded by the weathering. The targeting areas, which should be kept eyes on for prspecting diamond in the future, are those of the less eroded footwall of the deep fracture and the ancient un-uplifted Caledonian plane. |
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来源
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矿物学报
,2021,41(3):258-270 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2021.41.056
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关键词
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钾镁煌斑岩
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地球化学
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源区特征
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黔东南
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地址
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贵州省土地矿产资源储备局, 贵州, 贵阳, 550000
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自然资源部基岩区矿产资源勘查工程技术创新中心, 自然资源部基岩区矿产资源勘查工程技术创新中心, 贵州, 贵阳, 550000
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西北大学地质学系, 大陆动力学国家重点实验室, 陕西, 西安, 710069
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贵州省地质矿产勘查开发局101地质队, 贵州, 凯里, 556000
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贵州省有色和核工业地质矿产勘查院, 贵州, 贵阳, 550000
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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贵州省项目
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文献收藏号
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CSCD:6983124
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