辽西建平地区太古宙建平群小塔子沟组变质岩地质特征

辽西地区太古宙变质杂岩在建平一带分布最广泛，特征最明显，代表性最强，是一套片麻岩夹磁铁石英岩的变质岩系。经岩石学、地球化学研究表明，原来建立的建平群小塔子沟组变质岩，是由变质表壳岩和变质深成岩组成，以变质深成岩为主，变质表壳岩以包体形式漂浮与变质深成岩之中。变质表壳岩的斜长角闪岩、基性麻粒岩和超铁镁质岩为基性一超基性火山岩，磁铁石英岩成因与基性火山岩和基性火山沉积岩有亲缘关系。叶柏寿片麻岩和斜长片麻岩、二长片麻岩为侵入形成的闪长岩、英云闪长岩和二长花岗岩。

The Geological Character of Metamorphism Complex Rock of Xiaotazigou Formation, Jianping Group of Archean in Jianping Local of the West Liaoning

The metamorphic complex rock of Archean is a set of gneiss with mixing magnetite-quartzite,with the most obvious feature and the best typical,and is distruted widely in Jianping local of the west Liaoning.Research indicated by the petrology and geochemistry,that the formerly established Xiaotazigou Formation metamorphic rock system is consisted of supercrustal rocks and plutonic granite complex.Manly to metamorphic plutonic rocks,supercrustal rocks floats among metamorphic plutonic rock in a enclave form.Metamorphic supercrustal rocks is consisted of plagioclase-amphibolite,granulite and ultra mafic rocks,and original rock is a set of basic-ultramafic volcanics.Causes of magnetite quartzite has a genetic relationship with basic volcanics and selimentary-volcanic.Original rockof Ye-bai-shou gneiss,plagiognesis and second-feldspar gneiss is invaded diorite,britain goes diorite and two granite.