中国科学院地质与地球物理研究所徐亚团队研究了华南大陆边缘深部地壳结构与大型花岗岩体特征：三维密度结构反演的启示。2025年5月21日，《中国科学：地球科学》发表了这一成果。

华南大陆边缘跨越了各种陆海构造单元，包括江南造山带、华夏地块和南海北缘，表现出明显的地壳结构差异。华南中生代花岗岩的广泛暴露揭示了该地区广泛的构造岩浆活动。因此，深入研究华南大陆边缘的深部构造，对于了解该地区的构造演化和资源效应具有重要意义。研究组以南海和南海北部地区为研究对象，采用哈密顿蒙特卡罗（HMC）三维密度重力反演方法，结合深地震测深和海底地震仪数据，建立了覆盖南海大陆边缘陆海范围的三维密度模型。 

密度结构显示莫霍面深度为28-48公里的中国南方大陆、22~28公里的南海北缘、10-20公里的莫霍面从陆地上升到海洋。根据该地区花岗岩的密度特征，划定了花岗岩体的可能分布范围。结果表明，庙儿山-岳城岭和朱光山-万阳山花岗岩体的底部边界延伸约12-15公里，而佛冈和大龙山石万达山花岗岩体的底部边界深度约为4-5公里，华南大陆边缘地壳结构由海向陆增厚，叠加局部地壳减薄，反映了华南大陆复杂的构造变化和多期构造岩浆活动的综合影响。从密度结构推断出的大型花岗岩体的深度分布为探索该地区深部构造岩浆活动及其对矿化的影响提供了依据。

附：英文原文

Title: Deep crustal structure of the South China continental margin and characteristics of large granite bodies: Insights from 3D density structure inversion

Author: Wei CHU, Ya XU, Jian ZHANG, Qianwen ZHANG, Shupeng LU

Issue&Volume: 2025/05/21

Abstract: The South China continental margin spans various land-sea tectonic units, including the Jiangnan orogenic belt, the Cathaysia Block, and the northern margin of the South China Sea, exhibiting significant crustal structural differences. The widespread exposure of Mesozoic granites in South China reveals extensive tectonic-magmatic activities in the region. Therefore, in-depth research into the deep structure of the South China continental margin is of great significance for understanding the tectonic evolution and resource effects of the area. This paper focuses on the South China and northern South China Sea regions, employing the Hamiltonian Monte Carlo (HMC) three-dimensional density gravity inversion method, combined with deep seismic sounding and ocean bottom seismometer data, to establish a three-dimensional density model covering the land-sea extent of the South China continental margin. The density structure reveals Moho depths of 2848km in the South China continent, 2228km in the northern margin of the South China Sea, and 1020km in the northwestern sub-basin, with the Moho surface rising from land to sea. Based on the density characteristics of granites in the region, the possible distribution ranges of granite bodies are delineated. The results show that the bottom boundaries of the Miaoershan-Yuechengling and Zhuguangshan-Wanyangshan granite bodies extend approximately 1215km, while the bottom boundaries of the Fogang and Darongshan-Shiwandashan granite bodies are at depths of about 45km. The crustal structure of the South China continental margin thickens from sea to land, superimposed with local crustal thinning, reflecting the complex tectonic changes of the South China continent and the comprehensive influence of multi-phase tectonic-magmatic activities. The depth distribution of large granite bodies inferred from the density structure provides a basis for exploring deep tectonic-magmatic activities and their impact on mineralization in the region.

DOI: 10.1007/s11430-024-1574-x

Source: https://www.sciengine.com/SCES/doi/10.1007/s11430-024-1574-x