[1]李 海,李永军,徐学义.2018.西准噶尔达尔布特蛇绿岩带萨尔托海岩体深部结构、构造特征: 地质与地球物理证据.大地构造与成矿学,优先出版:001-17.doi:10.16539/j.ddgzyckx.2020.04.020
 LI Hai,LI Yongjun,XU Xueyi.2018.Deep Structure and Texture of the Sartohay Ophiolite in West Junggar, Xinjiang: New Evidences from Geology and Geophysics.Geotectonica et Metallogenia,优先出版:001-17.doi:10.16539/j.ddgzyckx.2020.04.020
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西准噶尔达尔布特蛇绿岩带萨尔托海岩体深部结构、构造特征: 地质与地球物理证据
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
001-17
栏目:
出版日期:
2020-12-30

文章信息/Info

Title:
Deep Structure and Texture of the Sartohay Ophiolite in West Junggar, Xinjiang: New Evidences from Geology and Geophysics
作者:
李 海1 李永军12 徐学义13 万 阈4 赵 强4 杨高学12 王祚鹏1
1.长安大学 地球科学与资源学院, 陕西 西安 710054; 2.国土资源部岩浆作用成矿与找矿重点实验室, 陕西 西安 710054; 3.中国自然资源航空物探遥感中心, 北京 100083; 4.新疆地矿局第七地质大队, 新疆 乌苏 833000
Author(s):
LI Hai1 LI Yongjun12 XU Xueyi13 WAN Yu4 ZHAO Qiang4 YANG Gaoxue12 and WANG Zuopeng1
1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi’an 710054, Shaanxi, China; 3. China Aero Geophysical Survey & Remote Sensing Center for Land and Resources, Beijing 100083, China; 4. Seventh Geological Survey Team, Xinjiang Bureau of Geology and Mineral Resource Exploration, Wusu 833000, Xinjiang, China
关键词:
蛇绿混杂岩 深部结构与构造 地球物理 萨尔托海岩体 西准噶尔
Keywords:
ophiolitic mélange deep structure and texture geophysics Sartohay ophiolite west Junggar
分类号:
P54
DOI:
10.16539/j.ddgzyckx.2020.04.020
文献标志码:
A
摘要:
西准噶尔地区分布多条蛇绿混杂岩带, 地表地质已有大量研究成果, 但蛇绿岩深部结构构造研究相对薄弱, 一定程度上制约了该地区地质构造演化的深入认识。为此, 本文选取达尔布特蛇绿混杂岩带萨尔托海段开展了大比例尺地质填图配套地面重力、磁法和可控源音频大地电磁测深(CSAMT)等综合测量, 获得了该蛇绿岩体地表分布、接触关系以及深部的磁性、密度结构和电性特征, 精细刻画了蛇绿岩的深部结构与构造, 并进一步分析了其侵位机制和动力学过程。萨尔托海蛇绿岩具有低重力、高磁性和变化范围较宽的电阻率值, 岩体整体以构造岩块状产出, 表现出挤压逆冲、走滑剪切、破碎蚀变等变形变质。本文及前人研究成果表明, 萨尔托海岩体是在近东西向挤压兼走滑应力作用下以斜向楔冲形式构造就位, 并进一步受到后期左行走滑和岩浆作用的叠加改造。结合区域构造演化, 西准噶尔蛇绿岩的构造侵位与晚石炭世板块汇聚背景下残余洋盆的收缩有关, 持续的挤压兼走滑应力使残余洋盆下伏基底蛇绿岩沿断裂构造侵位于上覆沉积地层。
Abstract:
The West Junggar, which is located in the southwest margin of the Central Asia Orogenic Belt (CAOB) has several Paleozoic ophiolitic mélanges distributed. These ophiolitic mélanges are remnants of the Paleo-Asian Ocean evolution and important keys for studying the component, tectonic evolution and crust-mantle interaction of the CAOB. Researches on the surface have achieved lots of results, however, the deep structure of ophiolitic mélanges in the West Junggar is still unclear. Current researches are mainly based on geological mapping and structural analysis, which do not have deep information as constraint. In this study, based on detailed geological survey in Sartohay area of the Darbut ophiolitic mélange, West Junggar, comprehensive geophysical measurements including ground gravity measurement, magnetic measurement and controlled-source audio-frequency magnetotelluric (CSAMT) were conducted. The surface distribution, contact relationship and gravity, magnetic, CSAMT data of Sartohay ophiolite were recorded. Constrained by surface geology and drilling information, the obtained geophysical data were inverted and interpreted, and the deep structure and texture of Sartohay ophiolite were described. The comprehensive analysis of geology and geophysics shows that Sartohay ophiolite is occurred in the form of rootless tectonic blocks and have the characteristics of oblique thrust, transverse extrusion and lateral strike slip. Controlled by W-E compressive stress with strike-slip component, ophiolites of Sartohay area were emplaced in the form of oblique wedge-thrusting, and further reformed by sinistral strike-slip and magmatism in later stage, Their emplacement mechanism is closely linked with the shrinkage of remnant ocean basin, and the convergence of Kazakhstan and Junggar terranes in Late Carboniferous is the important background of this dynamic process.

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备注/Memo

备注/Memo:
收稿日期: 2020-02-19; 改回日期: 2020-08-26
项目资助: 国家自然科学基金项目(41273033)、国家重点研发计划专项子课题“天山-阿尔泰大宗矿产分布规律研究与深部资源潜力评价” (2018YFC0604001)和中央高校专项基金(300102279209)联合资助。
第一作者简介: 李海(1989-), 男, 博士研究生, 构造地质学专业。Email: lihai@chd.edu.cn
通信作者: 李永军(1961-), 男, 教授, 博士生导师, 主要从事区域地质和构造地质学研究。Email: yongjunl@chd.edu.cn
更新日期/Last Update: 2020-09-17