钾玄质系列岩石的研究现状

发布时间：2018-04-13 10:17

本文选题：钾玄质岩 + 地球化学　；参考：《地质论评》2017年06期

【摘要】：钾玄质系列岩具有特殊的矿物学和地球化学特征,并具有重要的构造及成矿意义,自命名以来备受关注,但仍有许多问题存在较大争议,如岩石类型扩大化、是否存在壳源成因、板内环境如何判别等等。本文从以下几方面对钾玄质系列岩进行了系统总结:(1)作为一个独立的岩石系列,钾玄质系列岩仍缺失明确有效的岩石学、矿物学和地球化学等判别指标,相对统一的标准亟待建立;(2)与岛弧有关的钾玄质系列岩表现为高度富集大离子亲石元素和轻稀土元素,具有显著地TNT异常(Ta—Nb—Ti);大洋板内钾玄质系列岩具有典型的洋岛玄武岩(OIB)的微量元素特征;大陆板内钾玄质系列岩石兼具岛弧型和OIB型微量元素特征;(3)低硅钾玄质岩(SiO_2不大于63%)应当主要源于地幔源区,高硅钾玄质岩主要源于地壳源区,但更多情况下是二者的混合。
[Abstract]:The potash series rocks have special mineralogical and geochemical characteristics, and have important tectonic and metallogenic significance. They have attracted much attention since their nomenclature, but there are still many controversial problems, such as the enlargement of rock types.Whether there is the origin of shell source, how to judge the inside-board environment and so on.In this paper, the authors have systematically summarized the potash series rocks from the following aspects: as an independent rock series, the potash series rocks still lack definite and effective discriminant indexes such as petrology, mineralogy and geochemistry, etc.The relatively uniform standard should be established urgently) the potash series rocks related to island arc are highly enriched in large ion lithophile elements and light rare earth elements.It is characterized by significant TNT anomaly (Ta-Nb-TiN) and typical oceanic basalts (OIBs) in the oceanic plate.The continental intraplate potash series rocks are characterized by both island arc and OIB type trace elements.) the SiO-2 of low siliceous potash rocks is not greater than 63.) it should mainly originate from the mantle source region, and the high silicalite mainly originates from the crustal source region, but it is more likely to be a mixture of the two kinds of rocks.
【作者单位】：中国地质调查局武汉地质调查中心;中国地质调查局花岗岩成岩成矿地质研究中心;
【基金】：国家自然科学基金资助项目(编号:41302046) 中国地质调查局基础地质研究项目(编号:12120113063600、DD20160064-01)的成果~~
【分类号】：P588.14

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