An overview of northern Vietnam deep crustal structures from integrated geophysical observations

Multiple geophysical datasets from northern Vietnam were examined and reanalyzed to explore detailed structures within the deep crust and their relationship to major tectonic fault systems in this region. Deep seismic data using explosions were collected and examined to crustal structure in northern...

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Main Authors: Van-Toan Dinh, Steven Harder, Bor-Shouh Huang, Viet-Bac Trinh, Van-Tuyen Doan, Hop-Phong Lai, Anh-Vu Tran, Hong Quang-Thi Nguyen, Van-Duong Nguyen
Format: Article
Language:English
Published: Springer 2018-01-01
Series:Terrestrial, Atmospheric and Oceanic Sciences
Online Access: http://tao.cgu.org.tw/media/k2/attachments/v294p371.pdf
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author Van-Toan Dinh
Steven Harder
Bor-Shouh Huang
Viet-Bac Trinh
Van-Tuyen Doan
Hop-Phong Lai
Anh-Vu Tran
Hong Quang-Thi Nguyen
Van-Duong Nguyen
author_facet Van-Toan Dinh
Steven Harder
Bor-Shouh Huang
Viet-Bac Trinh
Van-Tuyen Doan
Hop-Phong Lai
Anh-Vu Tran
Hong Quang-Thi Nguyen
Van-Duong Nguyen
author_sort Van-Toan Dinh
collection DOAJ
description Multiple geophysical datasets from northern Vietnam were examined and reanalyzed to explore detailed structures within the deep crust and their relationship to major tectonic fault systems in this region. Deep seismic data using explosions were collected and examined to crustal structure in northern Vietnam. Based on the determined depths of seismic boundaries, we verified crustal densities by gravity inversion model of Bouguer anomalies. Then, refer to those verified crustal densities; crustal interface boundaries along selected profiles in northern Vietnam were inverted by fitting its gravity anomalies. Integration results reveal significant lateral variations in the depth of the Moho discontinuity. The Moho depth increases from coastal to mountainous areas, and increases more rapidly towards the northwest. The rapid thickening of the crust can be considered as the southeastern extension of the eastern Tibetan along the eastern Himalayan syntaxis. We deduce that these variations are controlled by the main tectonic faults in northern Vietnam. Furthermore, although the Red River fault zone is considered as a boundary between two regional crustal blocks, however, no remarkable differences in crustal density and Moho depth were obtained by our analysis. A comparison of previous magnetotelluric studies and heat-flow observations indicates that the low resistivity of the uppermost mantle beneath the Hanoi basin region is well correlated with the location of a high heat-flow anomaly. The high heat-flow and thin crust determined in this study is suggestive of a recent rifting process of the opening of the South China Sea.
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spelling doaj.art-469b94d54f6c4e6caf7cf8bb0a2b0ae72022-12-22T00:49:32ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802018-01-0129437138610.3319/TAO.2018.01.02.01An overview of northern Vietnam deep crustal structures from integrated geophysical observationsVan-Toan DinhSteven HarderBor-Shouh HuangViet-Bac TrinhVan-Tuyen DoanHop-Phong LaiAnh-Vu TranHong Quang-Thi NguyenVan-Duong NguyenMultiple geophysical datasets from northern Vietnam were examined and reanalyzed to explore detailed structures within the deep crust and their relationship to major tectonic fault systems in this region. Deep seismic data using explosions were collected and examined to crustal structure in northern Vietnam. Based on the determined depths of seismic boundaries, we verified crustal densities by gravity inversion model of Bouguer anomalies. Then, refer to those verified crustal densities; crustal interface boundaries along selected profiles in northern Vietnam were inverted by fitting its gravity anomalies. Integration results reveal significant lateral variations in the depth of the Moho discontinuity. The Moho depth increases from coastal to mountainous areas, and increases more rapidly towards the northwest. The rapid thickening of the crust can be considered as the southeastern extension of the eastern Tibetan along the eastern Himalayan syntaxis. We deduce that these variations are controlled by the main tectonic faults in northern Vietnam. Furthermore, although the Red River fault zone is considered as a boundary between two regional crustal blocks, however, no remarkable differences in crustal density and Moho depth were obtained by our analysis. A comparison of previous magnetotelluric studies and heat-flow observations indicates that the low resistivity of the uppermost mantle beneath the Hanoi basin region is well correlated with the location of a high heat-flow anomaly. The high heat-flow and thin crust determined in this study is suggestive of a recent rifting process of the opening of the South China Sea. http://tao.cgu.org.tw/media/k2/attachments/v294p371.pdf
spellingShingle Van-Toan Dinh
Steven Harder
Bor-Shouh Huang
Viet-Bac Trinh
Van-Tuyen Doan
Hop-Phong Lai
Anh-Vu Tran
Hong Quang-Thi Nguyen
Van-Duong Nguyen
An overview of northern Vietnam deep crustal structures from integrated geophysical observations
Terrestrial, Atmospheric and Oceanic Sciences
title An overview of northern Vietnam deep crustal structures from integrated geophysical observations
title_full An overview of northern Vietnam deep crustal structures from integrated geophysical observations
title_fullStr An overview of northern Vietnam deep crustal structures from integrated geophysical observations
title_full_unstemmed An overview of northern Vietnam deep crustal structures from integrated geophysical observations
title_short An overview of northern Vietnam deep crustal structures from integrated geophysical observations
title_sort overview of northern vietnam deep crustal structures from integrated geophysical observations
url http://tao.cgu.org.tw/media/k2/attachments/v294p371.pdf
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