崤山太古宙花岗—绿岩地体的地质特征

THE GEOLOGIC CHARACTERISTICS OF THE ARCHEAN EON GRANITE-GREENSTONE TERRAINS IN XIAOSHAN MOUNTAINS REGION

崤山太古宙花岗—绿岩地体由 15%的绿岩带 (变质表壳岩系 )和 85%的花岗质片麻岩系(变质侵入岩 )组成。呈包体产出的绿岩系分为以变火山岩为主的兰树沟岩组和以变沉积岩为主的杨寺沟岩组。花岗质片麻岩包括早期富钠的TTG质花岗岩和稍后的富钾花岗岩。晚期则有代表大陆地壳裂解的基性岩墙群侵入。文中介绍了各岩石单元的地质、地球化学特征及花岗—绿岩带的变形和变质特征 。

The Archean Eon granite-greenstone terrains in Xiaoshan Mountains region formed with the greenstone belt about 15 percent(metamorphic supracrustal rock series) and granitic gneissic rock series about 85 percent(metamorphic intrusive rocks).The greenstone series occurred as the enclosures consisted of the Lanshugou Lithodeme took the metavolcanic rock as the dominant rocks and the Yangsigou Lithodeme took the metasedimentary rock as the dominant rocks. The granitic gneissic rock series contained the early rich-agpaitic TTG-granites and the later rich-potash granites. There was the intrusion of basic cluster expressed the cracking of continental earth crust in the later period. The geologic-geochemical characteristics of every rocky units, the deformation and metamorphism characteristics of granite-greenstone terrains and the evolution of Archean Eon continental earth crust in the studying area have been expounded and approached in this paper.