Subsurface structural mapping of the Ba Na area (Vietnam) utilizing aeromagnetic data

IF 2.7 4区 地球科学 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Luan Thanh Pham, Pham Trung Hieu, Van-Hao Duong, Thao Hoang-Minh, To-Nhu Thi Ngo, Dong Van Bui
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Abstract

The Ba Na region plays a crucial role in deciphering the tectonic evolution of the Indochina terrane. This study addresses the scarcity of geophysical research in the area by utilizing aeromagnetic data to delineate subsurface structures. Various techniques including reduction to the pole (RTP), multi-stage RTP, reduction to the equator (RTE), enhanced analytic signal (EAS), theta map (TM), tilt angle of the horizontal gradient (TAHG), and fast sigmoid-based edge detection (FSED) were examined on synthetic datasets before employing them to analyze the geomagnetic field of the region. The results from the synthetic example show that the use of the RTE filter can provide a more reliable and accurate approach for removing asymmetries caused by non-vertical magnetization. These results also demonstrate the efficacy of applying TAHG and FSED to RTE aeromagnetic data for mapping subsurface structures in the Ba Na area. The findings reveal major magnetic contacts in the approximate ENE-WSW direction and the secondary contacts in the N-S direction, with depths ranging from 200 to 650 m, possibly arising from the collision between the Northern and Southern Vietnam blocks. Additionally, intrusive structures were identified in the region. This study constitutes the initial magnetic interpretation, providing valuable insights into the structural characteristics of the Ba Na area and filling a notable research gap in the understanding of this geologically significant region.

Abstract Image

利用航磁数据绘制巴拿(越南)地区地下结构图
巴纳地区在解读印度支那陆相构造演化方面发挥着至关重要的作用。针对该地区地球物理研究稀缺的问题,本研究利用航空磁数据来划分地下结构。在利用各种技术分析该地区的地磁场之前,先在合成数据集上检验了各种技术,包括极点还原(RTP)、多级 RTP、赤道还原(RTE)、增强分析信号(EAS)、θ 地图(TM)、水平梯度倾斜角(TAHG)和基于快速 sigmoid 的边缘检测(FSED)。合成示例的结果表明,使用 RTE 滤波器可以提供一种更可靠、更准确的方法来消除非垂直磁化引起的不对称。这些结果还证明了将 TAHG 和 FSED 应用于 RTE 航磁数据以绘制 Ba Na 地区地下结构图的有效性。研究结果表明,主要的磁接触点大致在 ENE-WSW 方向,次要接触点在 N-S 方向,深度从 200 米到 650 米不等,可能是越南北部和南部地块碰撞造成的。此外,该地区还发现了侵入构造。这项研究构成了初步的磁性解释,为了解巴那地区的构造特征提供了宝贵的见解,并填补了在了解这一具有重要地质意义的地区方面的一个显著的研究空白。
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来源期刊
Earth Science Informatics
Earth Science Informatics COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
4.60
自引率
3.60%
发文量
157
审稿时长
4.3 months
期刊介绍: The Earth Science Informatics [ESIN] journal aims at rapid publication of high-quality, current, cutting-edge, and provocative scientific work in the area of Earth Science Informatics as it relates to Earth systems science and space science. This includes articles on the application of formal and computational methods, computational Earth science, spatial and temporal analyses, and all aspects of computer applications to the acquisition, storage, processing, interchange, and visualization of data and information about the materials, properties, processes, features, and phenomena that occur at all scales and locations in the Earth system’s five components (atmosphere, hydrosphere, geosphere, biosphere, cryosphere) and in space (see "About this journal" for more detail). The quarterly journal publishes research, methodology, and software articles, as well as editorials, comments, and book and software reviews. Review articles of relevant findings, topics, and methodologies are also considered.
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