冀东上营地区长河沿岸角闪斜长片麻岩与紫苏花岗闪长岩的关系及其成因  

RELATIONSHIP BETWEEN, AMPHIBOLE-PLAGIOCLASE GNEISS AND HYPERSTHENE GRANODIORITE ON THE CHANGHE RIVER IN SHANGYING AREA, EASTERN HEBEI, AND THEIR GENESIS

作　　者：王安建[1] 王微[1] 

机构地区：[1]长春地质学院,长春130026

出　　处：《岩石学报》1992年第1期50-60,共11页Acta Petrologica Sinica

摘　　要：冀东太古宙克拉通线性岩浆-构造混杂岩区内分布有一种具英云闪长岩-花岗闪长岩成分的角闪斜长片麻岩,空间上与紫苏花岗闪长岩密切伴生。角闪斜长片麻岩是紫苏花岗闪长岩受构造变形影响,沿一组共轭构造(N45°E,E15°S)发生退化变质的产物。退变质作用在有水参与的等化学体系内完成,并受最强期变形事件控制。Two types of rocks, amphibole-plagioclase gneiss with tonalite-granodiorite composition and hypersthene granodiorite, are closely associated in space in the Shangying area, in a linear belt of magmatic-tectonic 'hybrid rocks' on the Archean Craton in eastern Hebei Province. Previously, these two types of rocks have been designated as the Archean Shantunying and Malanyu Formations of the Qianxi Group or the Wangchang Formation of the Badaohe Group on the basis of classical stratigraphic research and are referred to be the supracrustal rocks undergone regional metamorphism of granulite facies and being futher affected by rerogressive metamorphism. However, the faint relationship between these types of rock association has led to suggest different ideas on the mechanism causing the retrogressive metamorphism and on regional retrogressive metamorphism and migmatization. Studies on the field relationship, mineral assemblage, petrochemistry, large ion lithophile elements (LILE) and REE of these two types of rock association indicate that the amphibole-plagioclase gneiss is a product of retrogressive metamorphism of the hypersthene granodiorite under the effect of tectonic deformation along a set of conjugate structures. The retrogressive metamorphism took place in an isochemical condition with the presence of H_2O and was controlled by the strongest tectonic event. The formation and spatial distribution of the amphibole-plagioclase gneiss are closely related to their geological background—multiple magmatic and tectonic events.

关 键 词：片麻岩 闪长岩 关系 成因 岩石 

分 类 号：P588.345[天文地球—岩石学]