☆ 4.6 Article

Lithospheric electrical structure of the Great Xing'an Range

JOURNAL OF ASIAN EARTH SCIENCES (2015)

期刊

JOURNAL OF ASIAN EARTH SCIENCES

卷 113, 期 -, 页码 501-507

出版社

PERGAMON-ELSEVIER SCIENCE LTD

DOI: 10.1016/j.jseaes.2015.01.026

关键词

Great Xing'an Range; Magnetotelluric; Lithosphere; Conductivity structure

类别

Geosciences, Multidisciplinary

资金

SinoProbe-02 program
National Natural Science Foundation of China [41430213, 41474081]
China Geological Survey [1212011220754, 12120114066001]

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Protocol

Reagent

摘要

In order to study the lithospheric structure and survey deep resources perspective of the Great Xing'an Range area, a magnetotelluric sounding profile across the central Great Xing'an Range has been completed. The profile starts from the eastern margin of the Hailaer basin, through the Great Xing'an Range to the western margin of the Songliao basin. An electrical structure model of the crust and the upper mantle was finally obtained after data processing, qualitative analysis and 2D inversion of the observed data. The electrical structure can be divided into three tectonic units: the Hailaer basin, the Great Xing'an Range and the Songliao Basin, which is consistent with the regional geology. The research shows that: (1) The high resistivity in the upper crust of the Great Xing'an Range may represent spatially multiple overlapping volcanic rocks, in addition, the low resistivity bodies in the middle-lower crust may reflect hot and weak materials; (2) The lower crust of the Great Xing'an Range may have experienced delamination; (3) There is a lithospheric scale of west-dipping structural transfer zone between the Great Xing'an Range and the Songliao Basin, inferring that the Songnen Terrane firstly subducted to the Xing'an Terrane, then sutured in the form of soft collision, and finally modified by volcanic activities later. (c) 2015 Elsevier Ltd. All rights reserved.

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Influence of methane seep activities and sea-level changes on elemental and isotopic compositions and abundance of carbonates in sediments of the Okinawa Trough since the last glacial period

Qing Li, Hongbin Wang, Feng Cai, Di Luo, Fanxing Kong, Ang Li, Xiting Liu

Summary: The elemental and isotopic compositions and abundance of carbonates in marine sediments are used to reconstruct ancient climate and ocean conditions. This study analyzed sediment samples from the Okinawa Trough to examine the relationship between carbonates' compositions and methane seepage and sea-level changes. The results indicate that both biogenic and authigenic carbonates are important factors in understanding paleoclimate and paleoceanography.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Seismicity around the boundary between eastern and western Makran

Maryam Akbarzadeh Aghdam, Abdolreza Ghods, Farhad Sobouti, Khalil Motaghi, Keith Priestley, Mohammad Enayat

Summary: The Makran subduction zone is difficult to monitor due to limited seismic activity, but a temporary seismic network was installed to investigate the relationship between different regions and detect seismicity. The observed seismicity suggests the presence of structural boundaries and seismically inactive areas.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Petrogenesis and tectonic implication of the Triassic syenitic complexes in the eastern Qinling orogen, central China

Zhen-Yu Wang, Hong-Rui Fan, Hai-Dong She, Kui-Feng Yang

Summary: This study conducted detailed geochemical, geochronological and isotopic analyses on the Songxian syenite in the Qinling Orogen. The results revealed the magma sources, petrogenesis and geodynamic implications of this alkaline intrusion. The study suggests that the syenite was formed through multiple stages of magmatism, involving the partial melting of the enriched lithospheric mantle and mixing with melts derived from the lower crust.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Petrogenesis of Jurassic granitic plutons in the Yanbian area, NE China: Implications for the subduction history of the Paleo-Pacific Plate

Yu Li, Wen-Liang Xu, Xiao-Ming Zhang, Jie Tang

Summary: This study presents new zircon U-Pb-Hf and whole-rock geochemical data for Jurassic intrusive rocks in the Yanbian area of NE China, providing insights into the subduction history of the Paleo-Pacific Plate. The study reveals three stages of Jurassic magmatism in the area, indicating the presence of an active continental margin related to the initial subduction of the Paleo-Pacific Plate beneath the Eurasian continent.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Spatial variability of surface sediments in the Malacca strait and its implications for sedimentary environments

Lina Ai, Shengfa Liu, Shuai Cong, Hui Zhang, Peng Cao, Kaikai Wu, Wenxing Ye, Che Abd Rahim Mohamed, Xuefa Shi

Summary: This study investigates the depositional configurations and sedimentary environments of the Malacca Strait through analyzing grain size characteristics and hydrographic data. The results show that residual sediments are concentrated in the central region, while modern terrigenous sediments are distributed along the coast of Malaysia and the northern region. The sedimentary environments are influenced by seasonal variations and hydrodynamic conditions.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Stable carbon isotopes and stomatal frequency of Middle Jurassic ginkgophyte fossils from the Turpan basin, northwestern China: Implications for reconstructing paleo-CO2 changes

Liang Xiao, Jia-qi Liang, Li-yan Guo, De-shuang Ji, Man Yuan, Xiang-chuan Li, Nan Sun, Zuo-chen Li

Summary: This study investigates the correlation between stable carbon isotopes of plant fossils and CO2 levels in the Jurassic period. The results suggest a weak correlation between the two, indicating caution is needed when using stable carbon isotopes to reconstruct high paleo-CO2 concentrations.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Paleo-Pacific Plate rollback triggered Early Cretaceous intermediate-felsic magmatism in the northern North China Craton

Xuli Yang, Feng Huang, Jifeng Xu, Xijun Liu, Liying Zhang, Zhao Zhang, Benyan Xu, Man Zhang, Yunchuan Zeng, Qian Liu, Mingda Lv

Summary: The extensively developed Early Cretaceous intermediate-felsic rocks in the northern North China Craton provide valuable insights into the nature of Paleo-Pacific subduction and associated geodynamic processes. Geochemical and geochronological analyses of trachyandesites and rhyolites from the eastern Hebei, northern NCC suggest that the trachyandesites likely originated from enriched mafic lower crust and the rhyolites are derived from the trachyandesitic magmas through fractional crystallization. The migration direction change of these rocks is believed to be primarily attributed to slab rollback of the subducting Paleo-Pacific Plate.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Variable depositional environments and organic matter enrichment of Early Cambrian shales in the Middle Yangtze region, South China

Wei Liu, Ping Gao, Xianming Xiao, Yanming Zhao, Yijie Xing, Jinku Li

Summary: The organic-rich shales of the Shuijingtuo Formation in China are an important target for shale gas exploration. The upper section of the formation, primarily consisting of limestone, silty shale, and black shale, has been rarely studied but recently showed promising results for shale gas exploration. Geochemical investigations of the upper section shale deposits revealed that the organic matter enrichment mechanism underwent dynamic changes due to relative sea-level changes and episodic upwelling activities.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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Article Geosciences, Multidisciplinary

Role of magmatism in efficient gas accumulation in Upper Ordovician-Lower Silurian shales in the Yangtze plate, South China: Evidence from the calcite U-Pb ages and gas C-N isotopes

Xin Wang, Chen Zhang, Zixin Xue, Qianyou Wang, Zhenxue Jiang, Kun Zhang, Xiangye Kong

Summary: This study analyzed the heterogeneity of gas compositions and the effects of magmatism on gas accumulation in shale gas exploration in the Yangtze plate. The results showed that magmatism caused the development of micro-fractures in shale reservoirs and accelerated the thermal evolution rate of organic matter. The impact of magmatism on shale gas accumulation varied in different regions, either favoring or compromising efficient gas accumulation in shale reservoirs.

JOURNAL OF ASIAN EARTH SCIENCES (2024)

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