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Magmatic stock emplacement and its constraints on the localization of related skarn orebodies: an example from the Tongguanshan stock, Tongling district, eastern China

Published online by Cambridge University Press:  22 July 2021

Hongsheng Liu Open the ORCID record for Hongsheng Liu [Opens in a new window] ,
Liangming Liu ,
Wei Cao ,
Yan Chen  and
Michel Faure
Hongsheng Liu
Affiliation:
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Ministry of Education, Changsha, 410083, China School of Geoscience and Info-Physics, Central South University, Changsha410083, China
Liangming Liu*
Affiliation:
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Ministry of Education, Changsha, 410083, China School of Geoscience and Info-Physics, Central South University, Changsha410083, China
Wei Cao
Affiliation:
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Ministry of Education, Changsha, 410083, China School of Geoscience and Info-Physics, Central South University, Changsha410083, China
Yan Chen
Affiliation:
Université d’Orléans, ISTO, CNRS/INSU/BRGM, UMR 7327, 45071Orléans, France
Michel Faure
Affiliation:
Université d’Orléans, ISTO, CNRS/INSU/BRGM, UMR 7327, 45071Orléans, France
*
Author for correspondence: Liangming Liu, Email: [email protected]
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Abstract

Study of constraints of stock emplacement and geometry on associated skarn orebodies is significant for the understanding of the epithermal deposit system. We have chosen the typical Tongguanshan skarn ore deposit (eastern China) as our target area. The Tongguanshan stock was emplaced at the NE–SW-striking Tongguanshan anticline and is characterized by macroscopically homogeneous quartz–monzodiorite. The magnetic parameters show that the stock is dominated by oblate magnetic ellipsoids and a high degree of anisotropy (> 1.1), and this value is higher at the stock margin. The strike of magnetic foliation at the stock margin is parallel to the stock boundary with sub-horizontal magnetic lineations. A vertical NE–SW-striking magnetic foliation, which is parallel to the regional structures, is revealed inside the stock. The three-dimensional geometric modelling shows that the stock has a tongue-like geometry and the contact surface in both eastern and western sides dips to the NW, but the western side is steeper. Nevertheless, the orebodies are almost developed at the eastern side. Accordingly, we propose that the Tongguanshan stock was constructed by multiple magma pulses, initiated at the SW part of the stock, and ascended along inherited NE–SW extended fractures in the Tongguanshan anticline. The successive magma pulses either accreted by a unilateral E-wards trend or by bilateral magma accretion, which resulted in a deformation difference in the contact zone and caused uneven orebody development. Our study also shows that the strike, dip angle and curvature situation of contact surface, which affects the water–rock reaction process and distribution of the dilation zone, are important ore-controlling factors.

Keywords

stock emplacement mechanismanisotropy of magnetic susceptibility3D geometric modellingTongling district
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 11 , November 2021 , pp. 2009 - 2024
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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