东准噶尔蛇绿混杂岩带区调填图单位的划分意见  

DISCUSSION ON THE UNIT DIVISION OF OPHIOLITIC MELANGE BELT FOR REGINAL MAPPING IN EAST JUNGGAR

作　　者：李嵩龄[1] 冯新昌[1] 董富荣[1] 李文铅[1] 

机构地区：[1]新疆地质矿产勘查开发局第一区域地质调查大队,新疆乌鲁木齐830011

出　　处：《新疆地质》1999年第4期350-355,共6页Xinjiang Geology

摘　　要：前人曾在东准噶尔双井子以东地区进行 1∶ 5万地质调查时 ,依据蛇绿岩建造的产出状况及构造侵位的特征 ,将蛇绿岩建造全部单元及岛弧或弧前盆地的火山岩建造 ,从南明水组解体出来 ,建立了“元湖组”。目前认为蛇绿混杂岩带是洋盆闭合时洋壳残片构造侵位到陆壳之中的产物 ,为无序层序 ,相当于造山带非史密斯地层学划分类型的构造混杂体类 ,即由构造包体和基质两大部分组成。构造包体是由蛇绿岩及其上覆岩系的远洋沉积物组成 ;基质包括不同时代 ,或同时代不同岩石的地层单元。“元湖组”具有“超群”的概念。对克拉麦里东双井子地区蛇绿混杂岩带 1∶ 5万地质填图等级体系划分重新厘定 ,将构造包体部分建立“元湖岩群”,其蛇绿岩部分建立“柳树泉岩组”;枕状熔岩及远洋沉积物建立“阔什喀尔苏岩组”。对于基质中所有组成单位建立“哲兰德岩群”,早石炭世陆缘沉积的正常碎屑岩仍采用“南明水组”,而火山岩建造建立“喀腊卡特岩组”。依据填图精度的要求可划分“段或岩段”、“While the preceding geologists were carring out the 1∶50 000 geological research work in the east region of Shuangjingzi of East Junggar,they took out ophiotitic suite and the volcanic formation of the island arc of the fore arc basin from the Nanmingshui Formation,and built a Yuanhu Formation.In accordance with the characteristics of the occurence and tectonic emplacement of the ophiolitic belt.The present knowledge about the ophiolitic melange belt is that it is the oceanic crustal remains intruded in the continental crust by tectonic emplacement.It is a disorder sequence and corresponding to the tectonic melange type according to the Non smith stratigraphic division plan,which consists of tectonic inclusion and martix.The tectonic inclusion is composed of ophiolite and the overlying pelagic deposit,the matrix is composed of stratigraphic units with different age or different rock types.Based on the composition characteristics of the ophiolitic melange belt,the Yuanhu Formation has the concept of super group,we redivided the ophiolitic melange belt of Shuangjingzi area of Kelameili region by a new grade system of 1∶50 000 geological mapping,the detailed division plan is:The tectonic inclusion is set up as Yuanhu rock Group,and its ophiolite part is set up as Liushuquan rock Group;the pillow lava and the pelagic deposit are set up as Kuoshikarsu rock Formation.The matrix is set up as Zhelande rock Group.The normarl clastics of epicontinental sedimentation of Early Carboniferous is still treated as Nanmingshu Formation.While make the volcanic Formation into Kalakate rock Formation,it can also be divided into member or rock member,as well as layer or rock layer.

关 键 词：东准噶尔 蛇绿混杂岩 构造包体 基质 

分 类 号：P623.13[天文地球—地质矿产勘探]