Lithospheric Electrical Characteristics of Eastern Jiangnan Orogen, South China

Gengen Qiu, Hui Fang, Qinyin Lv, Yan Pen, Dashuang He, Mexing He

2018

Abstract

A large amount of mineral resources are distributed in the Southern China, which shows South China block has experienced a complicated geological evolution process. Three dimensional (3D) lithospheric electrical structure model of eastern Jiangnan orogen was established in this paper by 3D OCCAM inversion program. The 3D lithospheric electrical structure model has a good corresponding relationship with the subsurface geology and regional magnetic anomalies, and thus can provide more detailed information about underground geological structure. From the perspective of 3D electrical structure model in combination with regional geologic conditions and regional magnetic data, the eastern Jiangnan orogenic belt and adjacent regions are divided into 4 first-order tectonic units and 16 secondary tectonic units. The 4 first-order tectonic units include North China zone with low resistance, Dabie orogenic belt zone with high resistance, Yangtze zone with low resistance and high-resistivity, and Cathaysia massif zone with high resistance. The 3D model shows that layers and abnormal bodies with low resistivity in the crust and upper mantle in the Southern China are widely developed. The characteristics of ‘U’ shape high resistance root in the deep part of Dabie Mountains imply that the North China block and Yangtze block collided and subducted beneath the Dabie Mountains on the north and south sides, suggesting strong compression uplift tectonic settings. The overall performance of the Yangtze block is characterized by high resistance in the middle and low resistance around. Huaiyu terrane located in the east of Yangtze block is of low resistance characteristic, suggesting apparent obduction tectonic environment. Evidently the assaulted low resistance anomalous in the lower section occurred along the collage tectonic belt, and these low resistance anomalous could be related to the distribution and formation of a large amount of metal minerals above. The low resistance anomalous whose tendency for south east along Jiangshao fault indicate the Cathaysia massif obducted to Yangtze block. The establishment of 3D lithospheric electrical structure model of the eastern Jiangnan orogen is to explore the relationships between different tectonic units and analyse the formation and evolution of south China continent, which could have important reference value for forecasting and prospecting of potential minerals.

Paper Citation

in Harvard Style

Qiu G., Fang H., Lv Q., Pen Y., He D. and He M. (2018). Lithospheric Electrical Characteristics of Eastern Jiangnan Orogen, South China.In Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG, ISBN 978-989-758-342-1, pages 415-420. DOI: 10.5220/0007431204150420

in Bibtex Style

@conference{iweg18,
author={Gengen Qiu and Hui Fang and Qinyin Lv and Yan Pen and Dashuang He and Mexing He},
title={Lithospheric Electrical Characteristics of Eastern Jiangnan Orogen, South China},
booktitle={Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG,},
year={2018},
pages={415-420},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007431204150420},
isbn={978-989-758-342-1},
}

in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG,
TI - Lithospheric Electrical Characteristics of Eastern Jiangnan Orogen, South China
SN - 978-989-758-342-1
AU - Qiu G.
AU - Fang H.
AU - Lv Q.
AU - Pen Y.
AU - He D.
AU - He M.
PY - 2018
SP - 415
EP - 420
DO - 10.5220/0007431204150420