Magnetic field modelling and interpretation of the Himalayan–Tibetan Plateau and adjoining north Indian Plains

Hemant, Kumar; Mitchell, Alice M.

doi:10.1016/j.tecto.2009.06.009

Cited by 17 publications

(11 citation statements)

References 28 publications

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“…The area west of the Lancangjiang fault (F 2 ) in western Yunnan Province is part of the Himalayan high geothermal zone, and it belongs to the subduction zone of the Myanmar-Andaman plate. It has the characteristics of an arc-type high geothermal zone and is a modern volcanic geothermal region with very active geological tectonics (Hemant and Mitchell 2009). In particular, the Tengchong area, which has the most intense new tectonic movement, is also one of the regions with modern volcanic activity in China.…”

Section: Research Backgroundmentioning

confidence: 99%

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Liu

Kang

Chen

et al. 2019

Earth Planets Space

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A Curie surface indicates the distribution of the thermal fields underground, providing a clear marker for the thermodynamic effect in the crust and mantle. In this paper, based on a geomagnetic field model (NGDC-720) and aeromagnetic data, we use power spectrum analysis of magnetic anomalies to estimate the Curie surface in Yunnan Province, China, and its adjacent areas. By combining the distribution of the Curie surface with regional heat flow, the geothermal gradient, crustal wave velocity ratio anomalies, high-conductivity layer anomalies, and the Moho surface, we reveal the connection between the undulation of the magnetic basement and the crustal structures. The results indicate that the uplift and depression of the Curie surface in the research area are distinct. The Curie surface is approximately inversely correlated to the surface heat flow. The Lijiang-Jianchuan-Baoshan-Tengchong and Jianchuan-Chuxiong-Kunming-Yuxi zones are two Curie surface uplift zones, and their crust-mantle heat flows are relatively high. The Curie surface uplift zone along the Lijiang-Xiaojinhe fault and Red River fault is consistent with the heading direction of the fault zone and is partially in agreement with the eastward mass flow of the Tibetan Plateau. The Curie surface uplift zone is consistent with the high wave velocity ratio and high-conductivity layer anomaly region of the crust. The depth of the Curie surface is less than the depth of the Moho surface.

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Section: Research Backgroundmentioning

confidence: 99%

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Liu

Kang

Chen

et al. 2019

Earth Planets Space

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“…Lesur and Gubbins (2000) attempted to use geomagnetic secular variation to separate remanent magnetization from induced magnetization, but they failed to achieve a satisfactory separation. As such, remanent magnetization is usually ignored in the continental crust (Hemant and Maus 2005a, b;Maule et al 2005;Hemant and Mitchell 2009). Along this line, the crustal magnetic field in our study region (i.e., west Himalayan syntaxis and its adjacent area) is well assumed to be dominated by induced magnetisation.…”

Section: Crustal Magnetic Anomalymentioning

confidence: 85%

An analysis of crustal magnetic anomaly and Curie surface in west Himalayan syntaxis and adjacent area

Gao

Kang

et al. 2016

Acta Geod Geophys

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In this paper, the magnetic model NGDC-720-V3 is used to investigate the distribution of crustal magnetic anomaly and the depth of Curie surface in west Himalayan syntaxis and its adjacent area. The Curie surface is compared with regional heat flow, the Moho, and seismicity. The results show that the magnetic anomaly and Curie surface are both consistent with the regional tectonic setting. Tarim craton, Tadjik Basin, and Indian Plate have positive magnetic anomaly and a Curie surface deeper than 36 km, corresponding to low heat flow there. In contrast, orogenic belts such as west Himalayan syntaxis, Tianshan Mountain, Afghanistan, and Tibetan Plateau have negative anomaly and a Curie surface shallower than 32 km, corresponding to high heat flow. The north of the syntaxis presents a positive anomaly on the surface, resulting from Ferghana Basin, while the negative anomaly in large depth is probably associated with the subduction of the slab and the resulting heat. The depth of the Curie surface has an inverse relationship to the Moho depth, which is attributed to temperature and isostatic balance. The distribution of earthquakes with epicenter deeper than 100 km clearly suggests the subduction of the Indian plate deep down to the asthenosphere and the deep earthquakes were caused by shear motion within the subducting slab.

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“…Lesur and Gubbins (2000) attempted to use geomagnetic secular variation to separate remanent magnetization from induced magnetization, but they failed to achieve a satisfactory separation. As such, remanent magnetization is usually ignored in the continental crust (Hemant and Maus, 2005;Hemant and Mitchell, 2009). Along this line, the crustal magnetic field in our study region (i.e., Ordos block and its adjacent area) is well assumed to be dominated by induced magnetisation.…”

Section: Crustal Magnetic Anomalymentioning

confidence: 99%

Crustal magnetic anomaly in the Ordos region and its tectonic implications

Gao

Kang

et al. 2015

Journal of Asian Earth Sciences

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Magnetic field modelling and interpretation of the Himalayan–Tibetan Plateau and adjoining north Indian Plains

Cited by 17 publications

References 28 publications

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

An analysis of crustal magnetic anomaly and Curie surface in west Himalayan syntaxis and adjacent area

Crustal magnetic anomaly in the Ordos region and its tectonic implications

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