论文部分内容阅读
新山层状、似层状透辉石岩产于新山岩体顶部碳酸盐岩地层层间,颜色较浅,呈浅绿色。其主要矿物为次透辉石,含量在50%以上,其次为钙长石,且矿物粒度小,呈间粒间隐结构。而发育在矿区花岗岩体与碳酸盐岩地层接触带的透辉石夕卡岩中主要矿物为钙铁辉石,含量在65%以上,其次为透闪石、石榴石和硅灰石等,矿物粒度较粗,呈显晶粒状结构。新山层状、似层状透辉石岩具有高Mg、Ti、P,富集Sr和大离子亲石元素(Rb、Th、U),相对亏损Ba、K等特征;稀土分配模式为右倾型,具有较小的Eu负异常(0.40～0.61)。整体上具有与矿区碱性玄武岩相似的微量元素和稀土元素特征,明显有别于新山花岗岩及新山典型的透辉石夕卡岩。通过地质、岩石学及地球化学研究,认为新山层状、似层状透辉石岩原岩很可能就是印支期碱性玄武岩,即在热卤水体系中,拉张裂谷环境下喷发的碱性玄武岩经热水交代蚀变形成。
Johor Bahru (JB) The layered, diatomite-like diopside produced in the carbonate rock strata at the top of the Johor rock mass is light in color and light green. The main minerals are diopside, content above 50%, followed by anorthite, and the mineral particle size is small, showing intergranular implicit structure. While the main minerals in the diopside skarn developed in the contact zone between the granite body and the carbonate rock strata in the mining area are heliotropism with a content of more than 65%, followed by tremolite, garnet, wollastonite, etc. Coarser particle size, showing granular structure. The layered layered and diopside diopside rocks are characterized by high contents of Mg, Ti and P, enriched Sr, large ion lithophile elements (Rb, Th and U) and relatively depleted Ba and K. The distribution patterns of REEs are right-inclined , With a smaller Eu negative anomaly (0.40 ~ 0.61). As a whole, it has trace element and rare earth elements similar to alkaline basalts in the mining area, which is obviously different from the typical diopside skarns of Xianshan granite and Xinshan. According to the study of geology, petrology and geochemistry, it is considered that the stratiform, laminar-like diopside rock of the Neo-sandstone is likely to be of Indosinian alkaline basalts, that is, the alkalescence eruptive in the hot brine system Basalt by hydrothermal alteration into account.