东北中生代增生杂岩及对古太平洋向欧亚大陆俯冲历史的制约  

The Mesozoic accretionary complex in NE China and its tectonic implications for the subduction of the Paleo-Pacific plate beneath the Eurasia

作　　者：周建波[1] 蒲先刚 侯贺晟[2] 韩伟[1] 曹嘉麟[1] 李功宇 ZHOU JianBo;PU XianGang;HOU HeSheng;HAN Wei;CAO JiaLin;LI GongYu(College of Earth Sciences,Jilin University,Changchun 130061,China;China Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]中国地质科学院,北京100037

出　　处：《岩石学报》2018年第10期2845-2856,共12页Acta Petrologica Sinica

基　　金：科技部深地专项(2017YFC0601304);国家自然科学基金项目(41730210);中国地质调查局项目(DD20160207;DD20189702)联合资助

摘　　要：吉林-黑龙江东部地区的中生代增生杂岩,主要由吉林-黑龙江高压变质带和那丹哈达增生杂岩(或那丹哈达地体)组成。它们将为古亚洲洋与环太平洋构造域的转换作用,大洋板块地层(OPS)层序重建,特别是古太平洋板块向欧亚大陆的俯冲历史提供重要的科学依据。吉林-黑龙江高压带分布在佳木斯-兴凯与松辽地块之间的具有高压变质带性质的缝合带,新的地质年代学研究表明其形成时代为210～180Ma,表明晚三叠-早侏罗世为南北向古亚洲洋关闭和西向俯冲增生开始的关键时期。那丹哈达增生杂岩则发育在佳木斯-兴凯地块东侧,并具体分为西部的跃进山杂岩和东部的饶河杂岩。新近发表的数据显示,跃进山杂岩就位时代为210～180Ma,这与佳木斯-兴凯地块西缘的吉黑高压带形成时代相似。而饶河杂岩就位时代为晚侏罗-早白垩世,最晚期就位的时代为早白垩世(137～130Ma)。因此,吉黑东部地区的中生代增生杂岩为古太平洋向欧亚大陆中生代的俯冲过程提供了关键的信息。The Mes0zoic accretionary complex in eastern part of the Jilin-Heilongjiang provinces of China,which mainly consists of the Jilin-Heilongjiang HP belt and the Nadanhada accretionary complex（ or Nadanhada terrane）,are the key evidence to understand the transformation from closure of Central Asian Ocean and beginning of the subduction of the Pacific plate beneath the Eurasia,reconstruction of the oceanic plate stratigraphy（ OPS）,especially,the history of the Paleo-Pacific subduction. The Jilin-Heilongjiang HP belt is the typical high-pressure metamorphism suture zone between the Jiamusi-Khanka and Songliao blocks and consists of the Heilongjiang blueschists belt and the Zhangguangcai accretionary complex. The Heilongjiang blueschist belt was overthrust onto the Jiamusi Block along the Mudanjiang fault in the western part of the Jiamusi massif and the blueschist facies metamorphism on these rocks has been recognized by the occurrence of diagnostic mineral glaucophane. The glaucophane in the blueschist often occurs in two forms： one is in fibrous structure,and the other occurs at the boundary between albite crystals,defining a strong lineation. The glaucophane was identified as crossite by electron microscopy,indicating epidote-blueschist facies metamorphic conditions. The Zhangguangcai complex consisting of the majority of the Jilin-Heilongjiang HP belt is located to the west of the Heilongjiang complex. It is mainly composed of greenschist,marble,two-mica schist,quartz schist,quartzite and metavolcanic rocks; all these units occur as tectonic blocks in the Mesozoic granite. New geochronological data indicate that the collision between the Jiamusi-Khanka and Songliao blocks along the Jilin-Heilongjiang HP belt occurred between 210 Ma and 180 Ma,suggesting that the Jilin-Heilongjiang HP belt is an important unit for characterizing the geodynamic switch from the north-south closure of the Central Asian Orogenic Belt to the onset of westward-directed accretion related to subduction of the Pacific plate during

关 键 词：中生代增生杂岩 古太平洋板块 中亚造山带 俯冲-增生历史 欧亚大陆东缘 

分 类 号：P542[天文地球—构造地质学]