摘要
进贤早官岭侵入体是作者近年来从事１：５万进贤图组区域地质调查所发现的。该侵入体主体岩性为黑云角闪闪长岩，全岩Ｒｂ－Ｓｒ等时线年龄为１２４０±１０Ｍａ，（￣（８７）Ｓｒ／￣（８６）Ｓｒ）＝０．７０３４，具有高Ａｌ＿２Ｏ＿３、ＴｉＯ＿２、ＣａＯ含量，低ＳｉＯ＿２含量的成分特征，其微量元素的ＭＯＲＢ标准化曲线与阿卓热斯碱性玄武岩极为相似，稀土总量较高，弱的负Ｅｕ异常。地球化学特征反映其岩浆为亏损地幔经低的部分融熔后，发生极低的结晶分异且未受地壳混染，固结后经构造运动拾升至地表。
Zhaoguanlin intrusion in Jinxian county was discovered by theauthors who conducted the regional geological survey of 1:50,000 Ji-nxian map in recent years.The lithology of the major body of theintrusion is biotite-amphibole-diorite.The whole rock Rb-Sr isochronage is 1240±10Ma,(￣(87)Sr/￣(86)Sr).=0.7034.It is characterized by high co-ntents of Al_2O_3,TiO_2 and CaO and low content of SiO_2.And the MORBmaster curve of its trace element is extremly similar with alkaline ba-salt because of higher total content of rare earth and weak negativeEu anomaly.The geochemical features show that the magma underwentextremly low crystalliazation and differenciation but didn't be hybridiz-ed by the crust after melting in the low part of the depleted mantle.And it was uplifted to the surface by the tectonism after consolida-tion.
出处
《江西地质》
1995年第2期132-138,共7页
Jiangxi Geology
