南岭地区与东南沿海地区中生代花岗岩放射性地球化学特征及岩石圈热结构对比研究

发布时间：2018-03-16 09:33

本文选题：南岭地区　切入点：东南沿海地区　出处：《岩石矿物学杂志》2017年04期 　论文类型：期刊论文

【摘要】：华南地区广泛发育中生代花岗岩,主要出露于南岭地区和东南沿海地区。受大地构造作用影响,自西向东,莫霍面深度逐渐变薄,深部温度逐渐升高,软流圈顶部上升,花岗岩形成时代也随之逐渐年轻化。南岭和东南沿海地区的地表和钻孔花岗岩放射性生热元素含量测试结果表明,南岭地区放射性生热率平均值为5.18μW/m~3,东南沿海地区为3.01μW/m~3,最高生热率为南岭佛冈岩体7.56μW/m~3;热贡献率主要来自Th和U的放射性衰变热,K的热贡献率一般不超过10%。通过本文研究结果,结合前人地质学、地球物理学和地热学研究成果,发现南岭地区和东南沿海地区地壳热流对地表热流值的贡献率分别为60%~65%和40%~45%,指示两者分别为"热壳冷幔"和"冷壳热幔"型岩石圈热结构。
[Abstract]:Mesozoic granites are widely developed in South China, mainly in Nanling area and southeast coastal area. Under the influence of geotectonics, from west to east, Moho surface depth gradually thinned, deep temperature gradually increased, and the top of the asthenosphere rose. The age of granite formation became younger and younger. The results of measurement of radioactive heat element contents of surface and borehole granites in Nanling and southeast coastal areas show that, The average radioactivity heat generation rate in Nanling area is 5.18 渭 W / m ~ (3), that in southeast coastal area is 3.01 渭 W / m ~ (3), the highest heat generation rate is 7.56 渭 W / m ~ (3) in Fogang rock mass of Nanling, and the thermal contribution rate mainly comes from Th and U's radiative decay heat contribution K is generally not more than 10%. Combined with previous achievements in geology, geophysics and geothermics, It is found that the contribution rate of crustal heat flow to surface heat flow in Nanling area and southeast coastal area is 60% and 40 45%, respectively, indicating that they are "hot crust cold mantle" and "cold crust hot mantle" type lithospheric thermal structure.
【作者单位】：东华理工大学核资源与环境省部共建国家重点实验室培育基地;东华理工大学地球科学学院;东华理工大学水资源与环境工程学院;
【基金】：中国地质调查局地质调查项目(12120113077900) 江西省教育厅科研项目(GJJ14476) 核资源与环境省部共建国家重点实验室自主基金(Z1606,Z1608,RGET1606) 江西省研究生创新基金(YC2016-S279)~~
【分类号】：P313;P588.121

【参考文献】