东昆仑黑海地区赛什腾组变质碎屑岩地球化学特征及其对物质来源的制约  

Geochemical Characteristics of the Serteng Formation Metamorphic Clastic Rocks in the Heihai Area of East Kunlun and Their Constraints on the Provenance

作　　者：靳立杰 王继林[3] 周汉文[4] 孙天河 王子圣 李春稼 于春楠 JIN Lijie;WANG Jilin;ZHOU Hanwen;SUN Tianhe;WANG Zisheng;LI Chunjia;YU Chunnan;无(No.1 Institute of Geology and Mineral Resource Exploration of Shandong Province,Jinan,Shandong 250100;Shandong Engineering Laboratory for High-Grade Fe Ores Exploration and Exploitation,Jinan,Shandong 250100;Shandong Bureau Testing Center of China Metallurgical Geology Bureau,Jinan,Shandong 250100;China University of Geosciences,Wuhan,Hubei 430074)

机构地区：[1]山东省第一地质矿产勘查院,山东济南250100 [2]山东省富铁矿勘查技术开发工程实验室,山东济南250100 [3]中国冶金地质总局山东局测试中心,山东济南250100 [4]中国地质大学(武汉),湖北武汉430074

出　　处：《地质与勘探》2022年第4期778-786,共9页Geology and Exploration

基　　金：中国地质调查局项目(编号:1212011086001)资助。

摘　　要：东昆仑地区出露的赛什腾组为一套边缘前陆盆地沉积,是原特提斯洋在东昆仑地区俯冲消减到碰撞闭合的沉积记录。对赛什腾组的地球化学特征进行分析和研究,有助于深入理解物源区的类型和性质。本次对东昆仑黑海地区赛什腾组的沉积序列进行了详细研究,对典型样品进行了主量、微量及稀土元素地球化学分析和研究。研究结果显示,黑海地区赛什腾组的变质碎屑岩原岩主要为杂砂岩,少量的岩屑砂岩和长石砂岩;其物源区大地构造背景主要为活动大陆边缘及大陆岛弧。赛什腾组主要来自陆源碎屑岩或中酸性岩浆岩等长英质物质来源区,并且在沉积过程中有白沙河岩组、小庙岩群、万宝沟群等古老沉积组分的加入。此外,原特提斯洋演化过程中形成的岛弧花岗岩,也为赛什腾组提供物质来源。The Serteng Formation exposed in the east Kunlun orogenic belt is a set of clastic deposits in peripheral foreland basin,which is a subduction and closed sedimentary record of the Proto-Tethys.The geochemical analysis of this formation will aid to further understand the type and nature of the provenance.This work studied the sedimentary sequence of the Serteng Formation in the Heihai area of East Kunlun in detail,and conducted geochemical analysis of the major,trace and rare earth elements of typical samples.Results show that the metamorphic clastic rocks of the Serteng Formation are mainly graywackes,with small amounts of lithic sandstones and feldspar sandstones.The source of the Serteng Formation in the Heihai area was under active continental margin and continental arc settings.This formation was mainly originated from felsic material source areas such as terrigenous clastic rocks or intermediate-acid magmatic rocks,with subsequent ancient sedimentary components of Baishahe Formation,Xiaomiao rock group and Wanbaogou Group in the deposition process.In addition,the island arc granite formed during the evolution of the Proto-Tethys Ocean can also serve as a provenance of the Serteng Formation.

关 键 词：元素地球化学 物质来源 大地构造背景 赛什腾组 黑海地区 东昆仑 

分 类 号：P595[天文地球—地球化学]