粤中古兜山地区晚侏罗世花岗岩地球化学特征及其地质意义
The Geochemical Characteristics of Late Jurassic Granites in Gudou Mountain in Central Guangdong Province and Its Geological Significance
DOI: 10.12677/AG.2019.96055, PDF,    科研立项经费支持
作者: 周献清：广东省地质调查院，广东 广州
关键词: 古兜山；地球化学特征；后碰撞环境；A-型花岗岩；Gudou Mountain； Geochemical Characteristics； Post-Orogenic Collision Environment； A-Type Granites
摘要: 古兜山地区花岗岩富硅、富碱、高钾、过铝质，贫镁、钙，高FeO/MgO值，贫Ba、Sr、Nb、Ta、P、Ti，稀土元素高且轻稀土富集，Eu强亏损，LaN/YbN较接近1，配分模式为平坦“海鸥”型，属于A-型花岗岩；它是处于后碰撞环境下，区域地质应力转换，地壳山根垮塌而引发地幔物质上涌，使地壳物质发生熔融、分异而形成的。
Abstract: Late Jurassic Granites in Gudou Mountain area, which are characterized by rich silicon, rich alkali, high potassium, peraluminous, poor magnesium and calcium, high Feo/MgO value and GA value, and which have high rare earth amount with obvious fractionation of light and heavy rare earth elements, being rich in the trace elements relatively, depleted in Eu strongly, enriched in Rb, Th, U, K and depleted in Ba, Sr, P, Ti relatively, are typical A-type granites. Being occurred in the extensional environment during the post-orogenic collision stage, Late Jurassic granites were generated because tectonic transitions lead to the collapse of the mountain roots of the thickened crust, making the melting of crustal component and forming the Late Jurassic granites.
文章引用：周献清. 粤中古兜山地区晚侏罗世花岗岩地球化学特征及其地质意义[J]. 地球科学前沿, 2019, 9(6): 507-517. https://doi.org/10.12677/AG.2019.96055

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