岩石圈结构成像方法的进展与展望

单斌; 周万里

doi:10.19509/j.cnki.dzkq.2022.0241

岩石圈结构成像方法的进展与展望

doi: 10.19509/j.cnki.dzkq.2022.0241

单斌^{a, b,},
周万里^{a, b}

1a.
中国地质大学(武汉)地球物理与空间信息学院，武汉 430074
1b.
中国地质大学(武汉)地球内部多尺度成像湖北省重点实验室，武汉 430074

基金项目:

国家重点研发计划项目 201YFC1500302

国家自然科学基金项目 41674106

详细信息

作者简介:
单斌(1982—)，男，教授，博士生导师，主要从事地震的应力相互作用与岩石圈温度、化学组分结构成像研究工作。E-mail: binshan@cug.edu.cn

中图分类号: P631
计量
- 文章访问数: 561
- PDF下载量: 77
- 被引次数: 0
出版历程
- 收稿日期: 2022-09-16
- 网络出版日期: 2022-11-10

Methods and prospects for lithospheric structure imaging

Shan Bin^{a, b
,},
Zhou Wanli^{a, b}

1a.
Insitute of Geophysics and Geomatics, China University of Geosciences(Wuhan), Wuhan 430074, China
1b.
Hubei Subsurface Multi-Scale Imaging Key Laboratory, China University of Geosciences(Wuhan), Wuhan 430074, China

摘要

摘要:
近年来，随着观测数据的增加、观测精度的提升、物理化学理论的不断完善以及计算机技术的显著提升，使得人们对岩石圈物理化学性质的认识发生了重大改变。介绍了目前关于岩石圈结构成像的相关方法以及它们的优缺点，并以华南地区4个具有代表性的区域(四川盆地、江南造山带、下扬子克拉通以及华夏块体)为例，利用地形、大地水准面、地表热流、地震面波频散曲线等观测资料，通过热动力学模拟和概率密度反演方法，给出了该地区岩石圈温度、化学组分结构。结果显示，华南块体东部岩石圈较薄，岩石圈地幔以饱满型橄榄岩为主，太平洋板块由东往西的平俯冲作用可能是华南东部岩石圈减薄的主要动力学机制。结合现今岩石圈结构的研究现状，提出了岩石圈结构成像存在的问题，并对未来岩石圈结构成像研究进行了展望。
- 岩石圈温度结构 /
- 岩石圈化学组分结构 /
- 多观测概率密度反演 /
- 成像方法
Abstract:
In recent years, with rich observation data, the perfection of physical chemistry theory and the remarkable improvement of computer technology, great changes have taken place in the understanding of lithospheric physical and chemical properties. This paper introduces the current imaging methods of lithospheric structure and their advantages and disadvantages. Based on thermodynamic simulation and probability density inversion, we study the lithospheric thermal and compositional structure in South China (Sichuan Basin, Jiangnan Orogenic Belt, Lower Yangtze Craton and Cathaysian Block)using the observed Rayleigh wave phase velocity dispersion curve, geoid height, topography and surface heat flow. The results show that the lithosphere in the east of South China block is thin, and the lithospheric mantle is dominated by fertile peridotite, while the subduction of the Pacific plate from east to west may be the main dynamic mechanism of lithospheric thinning in the east of South China.Finally, we introduce the existing problems of lithospheric structure imaging and the prospect of future lithospheric structure imaging based on the current research status of lithospheric structure.
- lithospheric thermal structure /
- lithospheric compositional structure /
- multi observation probability density inversion /
- lithospheric imaging method

HTML全文

图 1 华南地区构造分区及地形图

Figure 1. Tectonic division and topographic map of South China

下载: 全尺寸图片幻灯片

图 2 L1剖面地形与选取点的岩石圈温度、厚度结构图

a.L1剖面地形图，红色五角星代表选取点位置；b~e.四川盆地(SB02、SB01)、江南造山带(JO02)以及华夏块体(HX02)反演收敛后的3 000个岩石圈温度、厚度集合，紫色虚线为1 250℃等温面，红色线段为岩石圈温度结构平均值；LAB为岩石圈底界面；LABStd为反演LAB深度的标准差

Figure 2. Lithospheric temperature and thickness structure of L1 profile topography and selected points

下载: 全尺寸图片幻灯片

图 3 L2剖面地形与选取点的岩石圈温度、厚度结构图

a.L2剖面地形图，红色五角星代表选取点位置；b~e.四川盆地(SB01)、江南造山带(JO01)以及下扬子克拉通(LY01、LY02)反演收敛后的3 000个岩石圈温度、厚度集合，紫色虚线为1 250℃等温面，红色线段为岩石圈温度结构平均值

Figure 3. Lithospheric temperature and thickness structure of L2 profile topography and selected points

下载: 全尺寸图片幻灯片

图 4 华南地区选取的8个点的岩石圈厚度概率密度分布

Figure 4. Probability density distribution of lithospheric thickness at eight selected points in South China

下载: 全尺寸图片幻灯片

图 5 华南地区选取的8个点的岩石圈地幔Mg#概率密度分布

Figure 5. Mg# probability density distribution of lithospheric mantle at eight selected points in South China

下载: 全尺寸图片幻灯片

表 1 不同的岩石圈定义和其主要特点

Table 1. Definitions and main characteristics of lithospheres

概念	主要特点
力学、流变学	水平应变率无明显垂直梯度(即无内部变形)，在地质时间尺度上与对流地幔有效隔离的区域^[1]
地震学	覆盖于上地幔低速带之上的高速物质区域^[2]
热学	热量主要通过传导传递的区域^[3]
弹性	地球坚固的外壳，可以弹性支撑施加的载荷，而不会永久变形^[4]
电学	通常是电阻性的，覆盖在更具导电性的物质之上的区域^[5]
地球化学	与下伏对流地幔相比，能够保留明显的地球化学和同位素特征的物质的时间更长^[6]
岩石学	上地幔中角闪石表现出稳定状态的区域^[7]

下载: 导出CSV

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