苏鲁超高压变质地体及其成因解释  

Su-Lu ULTRAHIGH-PRESSURE METAMORPHIC TERRANE AND EXPLANATION OF ITS ORIGIN

作　　者：张儒媛 从柏林[2] 刘忠光[1] 

机构地区：[1]美国斯坦福大学地质系,美国加州943052115 [2]中国科学院地质研究所,北京100029

出　　处：《岩石学报》1993年第3期211-226,共16页Acta Petrologica Sinica

基　　金：中国科学院基金会;美国科学基金会的资助

摘　　要：苏鲁超高压变质地体是秦岭-大别构造带的东延部分,主要由含榴辉岩的角闪岩相片麻岩和含蓝片岩的浅变质岩系组成。榴辉岩的变质年龄集中在320～220Ma(石炭纪-三叠纪)之间。柯石英榴辉岩的最新年龄为210Ma。以柯石英榴辉岩为代表的超高压变质岩可能是具有元古代基底苏鲁微大陆块前缘俯冲到70～100km或更深的地方,遭受超高压变质作用形成的。在晚三叠纪由于中朝和扬子板块的碰撞和缝合,产生的一系列逆冲、叠加和剪切作用使深位变质岩片受到抬升,使它们出露于地表。The Su-Lu ultrahigh-pressure metamorphic terrane, eastward portion of the Qinling-Dabie collision zone, is composed mainly of eclogite-bearing amphibole-gneisses and blueschist-bearing metamorphic rock series. The metamorphic ages of the eclogites are largely 320～220Ma(Carboniferous period to Triassic period). The latest age of coesite-bearing eclogites is 210Ma. The ultrahigh-pressure metamorphic rocks, represented by coesite-bearing eclogite, may have been formed as the former edge of the Su-Lu micro-continent with Proterozoic basement had subducted to 70～100km or more deep and suffered ultrahigh-pressure metamorphism. In the late Triassic period, a series of extrusion, imbrication and shearing, resulted from collision and delamination between the Sino-korean and Yangtze cratons, uplifted the deep-seated metamorphic rocks and exposed them onto the earth's surface.

关 键 词：苏鲁地区 变质地体 柯石英 榴辉岩 

分 类 号：P548.2[天文地球—构造地质学]