柴北缘塔塔楞环斑花岗岩的岩相学和地球化学特征

塔塔楞环斑花岗岩是柴达木盆地北缘一个古生代复式岩体。该环斑花岗岩在主量元素上, 具有富SiO2、K2O和FeO*， 高K2O/Na2O和FeO*/MgO的特点， 其平均值分别为72.86％、5.17％和3.35％，2.22和10.73；∑REE在279.1×10－6～300.3×10－之间，（La/Lu）N为11.32～13.14，δEu在0.28～0.38之间；Ba、Rb、Pb、Th等元素的含量高，而Sr、Cr、Ni、V等元素的含量低。与经典环斑花岗岩相比，二者在岩相学上相同，在地球化学上也有相似之处，即该岩体也表现为高钾、富铁和LREE，Eu亏损的特征，但部分微量元素与典型环斑花岗岩有一定差异。岩体的形成时代和区域构造背景的综合分析显示，该岩体可能是早古生代后碰撞或后造山伸展构造环境下的产物。

Geochemistry of the Tataleng rapakivi granite on the Northern Margin of the Qaidam Basin and its Geological significance.

Biogenetic reefs of well Xichen 1, Xisha sea area are mainly plant reefs which consist of calcareous alga, including Rhodophyta shell-like coralline algae, articulated coralline algae and Chlorophyta Halimeda, and secondly of coral reefs. Reef facies types are mostly reef core facies and back reef lagoon facies. Minerals in reef rocks is simplex, mainly consist of carbonate, involving low-magnesian calcite and ferroan dolomite. Textural components are organism framework, granular fragment, micrite and calcsparite. Rock types comprise framework limestone/dolostone, boundstone, grain limestone/dolostone, with organic framework texture, biology baffle texture, geniculum texture, binding texture, and cementitious texture. Reservoir pore space types are primary pore including intergranular pore and visceral foramen, and secondary pore including moldic pore, fissure, intragranular emposieu, enlarged intergranular pore, which mostly exist as intergranular pore-emposieu- intercrystal pore, with good storage capability.