The characteristics of S-wave velocity and mineralization of the “Double Domes” structure in the eastern of the Tethys Himalaya

IF 3.2 2区 地球科学 Q1 GEOLOGY
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Abstract

The Tethys Himalayan belt in the southern Qinghai–Tibet Plateau has been intruded by a large amount of leucogranite due to collisional orogeny. In addition, strong tectonic movements since the Cenozoic era have led to the formation of a series of dome structures accompanied by various types of mineralization. The Cuonadong Dome and Yalaxiangbo Dome, forming the “double dome” structure in the eastern part of the Tethys Himalayan Belt, are affected by different geological processes, resulting in differences in their deep structures and affecting the formation of polymetallic minerals. At present, geophysical research on the fine structure of the crust of the “double dome” structure is limited, making it difficult to fully understand the formation of different deep structures in the Tethys Himalayan dome belt. This hinders the progress of research on the genesis of dome structures and large-scale mineralization mechanisms in continental collisional environments. In this study, the ambient noise tomographic method was used to obtain the S-wave velocity structure of the upper crust of the Cuonadong Dome and the Yalaxiangbo Dome, and the following results were found: 1. there is a significant difference in the velocity structures of the two domes, with the core velocity structure of the Yalaxiangbo Dome showing an overall high velocity, extending downward for more than 9 km, while the core of the Cuonadong Dome exhibits low-velocity characteristics, with some high-velocity bodies occurring locally, which may be related to the later intrusion of leucogranite and extensional activity of the Cuona Rift. 2. There are significant differences in the S-wave velocities between the lead–zinc deposits and rare metal deposits in the study area; the lead–zinc deposits occur in basins and graben margins and have large variations in the S-wave velocity, which may be related to the involvement of basin brine in mineralization; below the tungsten–tin–beryllium deposits, the S-wave velocity exhibits high-velocity protrusions, with mineralization occurring at the front ends of the protrusions, which may be caused by crystallization differentiation of leucogranite. 3. The study area has abundant geothermal resources and obvious geothermal structural features. The low-velocity basin in the upper part of the upper crust is a heat storage layer, the low-velocity channel in the middle is a heat-conducting layer, and the lower part is a low-velocity heat source area that continuously supplies heat, forming a special geothermal structural model for the Cuonadong Dome and Yalaxiangbo Dome.

Abstract Image

特提斯喜马拉雅山东部 "双圆顶 "构造的 S 波速度和矿化特征
由于碰撞造山作用,青藏高原南部的特提斯喜马拉雅山带被大量白云岩侵入。此外,新生代以来强烈的构造运动形成了一系列穹隆构造,并伴有各种类型的矿化。在特提斯喜马拉雅山带东部形成 "双穹隆 "构造的爨底下穹隆和雅拉香波穹隆,由于受到不同地质作用的影响,其深部构造存在差异,影响了多金属矿物的形成。目前,对 "双穹隆 "构造地壳精细结构的地球物理研究十分有限,难以全面了解特提斯喜马拉雅穹隆带不同深部构造的形成过程。这阻碍了对大陆碰撞环境下穹窿构造成因和大规模成矿机制的研究进展。本研究采用环境噪声层析成像方法获得了穹隆和雅拉香波穹隆上地壳的 S 波速度结构,结果如下:1.两个穹隆的速度结构存在明显差异,雅拉香波穹隆的核心速度结构呈现整体高速,向下延伸超过9千米,而爨那东穹隆的核心呈现低速特征,局部出现一些高速体,这可能与爨那裂谷后期白云岩的侵入和延伸活动有关。2.研究区内的铅锌矿床与稀有金属矿床的S波速度存在明显差异;铅锌矿床位于盆地和地堑边缘,S波速度变化较大,这可能与盆地盐水参与成矿有关;在钨锡铍矿床下方,S波速度呈现高速突起,矿化发生在突起的前端,这可能是白云岩结晶分异造成的。3.研究区地热资源丰富,地热构造特征明显。上地壳上部的低速盆地为储热层,中部的低速通道为导热层,下部为持续供热的低速热源区,形成了爨底下穹隆和雅拉乡博穹隆特殊的地热构造模式。
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来源期刊
Ore Geology Reviews
Ore Geology Reviews 地学-地质学
CiteScore
6.50
自引率
27.30%
发文量
546
审稿时长
22.9 weeks
期刊介绍: Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.
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