中国东部苏鲁榴辉岩超基性岩褶皱带的演化及其与大别(中国)和柯切塔夫(哈萨克斯坦)杂岩的对比(英文)

苏鲁褶皱带形成于元古宙 (2 2 33～ 185 5Ma)典型优地槽构造环境 ,主要由石榴橄榄岩、石榴辉石岩、榴辉岩等侵入岩 (柯石英深度相地幔岩浆房中形成 )和它们的火山沉积建造围岩一起经褶皱、变质而形成。变质作用经历了先蓝片岩相 (前花岗岩 )后片麻岩混合岩相过程。由于变质作用的不规律性 ,苏鲁褶皱带可分为 2个构造带 :(1)东部构造带 (蓝片岩 )和 (2 )西部构造带 (片麻岩混合岩 )。根据A·都城秋穗所识别的变质带系统 ,可将其作为一个双变质带。东部构造带以出现许多块状、条带状榴辉岩辉石岩橄榄岩组合的残余岩块为特征 ,其中还残留着高压的矿物 (石榴石、绿辉石、柯石英 ) ,而且有被混合岩和各种交代岩替代的显著标志。在中生代 ,苏鲁元古褶皱带受造山作用的影响活化 ,导致许多花岗岩体的侵入 ,使交代岩广泛发育。

EVOLUTION OF THE SULU ECLOGITE-ULTRABASIC FOLD-BELT IN EASTERN CHINA AND ITS COMPARISON WITH DABIE (IN CHINA) AND KOKCHETAV (IN KAZAKHSTAN) COMPLEXES

Sulu fold belt is initially formed in Proterozoic (2 233～1 855 Ma). It may be considered as a typical eugeosyncline structure intruded by pyrope peridotite, garnet clinopyroxenite and eclogite formed from mantle magmatic chambers of the coesite depth facies. Together with host volcanic-sedimentary formations, these rocks have undergone folding and metamorphism, early blueschist metamorphism (pre-granitic) and successive gneiss-migmatite one. As a result of irregular metamorphism, Sulu fold belt has been divided into two structural zones: eastern (blueschist) and western (gneiss-migmatite) belts that allow us to consider it as a paired metamorphic belt in a system of such belts distinguished by A. Miyashiro. The eastern belt is characterized by the presence of numerous relict fragments of massive and banded eclogite-pyroxenite-peridotite complexes, and distinct signs of replacement of rocks by migmatite and various metasomatic rocks inheriting their high-pressure minerals (garnet, omphacite, coesite). In Mesozoic, the Proterozoic Sulu fold belt has undergone orogenic activization resulting in the intrusion of numerous granite bodies with broad development of metasomatic rocks.