摘要
讨论华南黑水─泉州地学断面的重磁解释。在解释中除应用常规的２．５维重磁异常反演外，还采用等密度线算法构制梯度层密度模型，用于分辨地壳密度细结构，以及计算自由地幔而深度用于分析上地幔密度的横向不均匀性。重磁模拟结果揭示了１０ｋｍ深度内的上地壳构造以及地壳与上地幔密度的分布。提出华南造山带以低密度上地幔为特征，它可能与上地幔的改造有关；四川盆地具有较高的上地幔密度，为未经改造的原始地幔。扬子克拉通与华南造山带的分界线与上地幔密度的分界线一致。根据布格异常、地表岩石密度和地形资料的综合分析，圈定出反映内生成矿作用深部标志的密度倒转区，可作为进一步找矿的远景区。
The aim of this paper is to discuss the gravity and magnetic interpretation of Heishui-Quanzhou Geoscience Transect of South China.In addition to the conventional 2.5D gravity and magnectic inversion method, the isodensity line algorithm for constructing gradient-layer density model was adopted so as to resolve the details of crustal density, and calculate the free surface of mantle for analysing lateral heterogeneities of the upper mantle density. Modelling of geopotential field anomalies reveals the upper crustal structures within the depth of 10km and the distribution of upper mantle density. The upper mantle of South China Orogenic Belt is characterized by low density related to the reconstruction of the upper mantle, while that of the Sichuan Basin by higher density being the primitive mantle, and the boundary between Yantze Craton and South China Orogenic Belt coincides with the boundary of upper mantle density.The combined analysis of Bouger gravity anomaly, surface rock density and topography data enabled us to distinguish the zones of density inversion connected with the deep criteria of endogenic mineralization as the most prospective regions for further investigations deposits.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
1994年第3期321-329,T002,共10页
Chinese Journal of Geophysics
关键词
地学断面
重磁模拟
黑水-泉州
Geoscience transect, Gravity and magnetic modelling,Density heterogenities in the upper mantle, Heishui-Quanzhou.
