柴达木东缘碰撞系统划分

杨立功; 刘继顺; 于换涛; 刘文恒; 尹利君

柴达木东缘碰撞系统划分

杨立功^{1, 2,},
刘继顺^{1, 2},
于换涛^{1, 2},
刘文恒^{1, 2},
尹利君^{1, 2}

1.
中南大学有色金属成矿预测教育部重点实验室, 长沙 410083
2.
中南大学地球科学与信息物理学院, 长沙 410083

基金项目:

国家115科技支撑计划课题"柴达木南北缘铅锌矿成矿规律及大型资源基地评价技术示范研究" 编号：2006BAA01B06

详细信息

作者简介:
杨立功(1962-), 男, 河南省南阳市人, 博士研究生, 高级工程师, 主要从事地质成矿预测及勘探。E-mail:13768136088@139.com

中图分类号: P588.1
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- 被引次数: 0
出版历程
- 收稿日期: 2012-10-20
- 刊出日期: 2013-06-01

DIVISION OF SUBDUCTION-COLLISION SYSTEM IN THE EASTERN QAIDAM BASIN

YANG Li-Gong^{1, 2
,},
LIU Ji-Shun^{1, 2},
YU Huan-Tao^{1, 2},
LIU Wen-Heng^{1, 2},
YIN Li-Jun^{1, 2}

1.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University, Changsha 410083, China
2.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

摘要

摘要: 基于前人对于柴达木东南缘北北西向鄂拉山岩浆带的研究成果，结合研究区火山-岩浆岩、蛇绿岩和沉积地层的形成时代、环境、分布规律、构造发育以及热力学环境和重磁地球物理异常等因素，认为鄂拉山岩浆弧是松潘-甘孜板块以阿尼玛卿蛇绿岩带为缝合线向北俯冲的产物。在整个闭合过程中，深部发生了滑脱，浅部碰撞前为半岛+拗拉槽+洋岛+海槽的基本格局，构造运动经历了洋壳俯冲消减、陆内碰撞造山和地壳伸展3个阶段，区内花岗岩的起因，始于洋壳俯冲，发展于陆内碰撞，因而，所发育的岩浆岩具有I-S过渡型花岗岩的特征，是海西晚期-燕山早期构造运动的地质记录。通过演绎这一发展过程，划分了柴达木东南缘岩浆岩带的碰撞体系。
- 俯冲消减 /
- 碰撞造山 /
- 地壳伸展 /
- 半岛 /
- 拗拉槽
Abstract: Based on the research fruits of southeastern margin NNW trending on Ela Mountain magmatic belt, in Qaidam by predecessors, combing with the elements of formation age, environment, structure, thermodynamic, gravity and magnetic geophysical anomaly for volcano-magmatite, ophiolite and sedimentary strata, we consider that the Ela Mountain magmatic arc was the production taking Songpan-Ganzi plate with the suture of A'nyemaqen Ophiolitic Belt as the northward closure. During the whole closing period, there was slippage in the in the bottom, and the shallow before colliding was the pattern of peninsulas+Aulacogen+oceanic. The tectonic movement experienced three stages of oceanic crust subduction reduction, intracontinental collision orogenesis and crust extension. The granite of research area started from oceanic crust subduction, developed in intracontinental collision, so it had dual character of I-S type granite, which is the geologic record of the tectonic movement in late Hercynian to early Yanshanian. With deducing the development process, the authors divided the collision system of magmatic belt in the southeastern margin of the Qaidam.
- subduction /
- collisional orogeny /
- crustal extension /
- peninsula /
- aulacogen

HTML全文

图 1 鄂拉山地区地质简图

1—断裂带及编号（F₁—野狐峡-塘断裂；F₂—温泉-哇洪山断裂；F₃—东昆仑北断裂；F₄—东昆仑中断裂；F₅—东昆仑南断裂；F₆—布青山南坡断裂）；2—柴达木地块早中生代克拉通化地层；3—二叠纪岛弧火山岩系；4—三叠纪火山岩及前陆盆地复理石沉积；5—石炭-二叠纪浅海碳酸盐岩；6—二叠纪花岗岩；7—蛇绿混杂岩；8—三叠纪花岗岩；9—平移断层；10—推覆构造；11—古缝合线；12—第四系；

Figure 1. Simplified geological map of ELA-mountain area

下载: 全尺寸图片幻灯片

图 2 鄂拉山地区重磁异常图

Figure 2. Regional gravity & magnetic survey map of ELA-mountain

下载: 全尺寸图片幻灯片

图 3 鄂拉山大地构造相剖面示意图

Figure 3. Tectonic facies profile map of ELA-mountain

下载: 全尺寸图片幻灯片

图 4 柴达木盆地东缘岩浆分布简图

（据袁万明）

Figure 4. Indosinian granitoid distribution sketch of the eastern QTM Basin

下载: 全尺寸图片幻灯片

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