Welcome to visit Geoscience!

Geoscience ›› 2012, Vol. 26 ›› Issue (5): 1051-1057.

• Geochemistry • Previous Articles     Next Articles

Ore-forming System around Magma — Model of Spatial Zonationfor Magmatic Rock and Deposit Set

 CEN  Kuang, TIAN  Zhao-Xue   

  1. School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China
  • Received:2012-07-26 Revised:2012-09-02 Online:2012-10-19 Published:2012-10-23

PDF (PC)

913

Abstract:

 According to the spatial and original relationship between current hydrothermal metal deposits and magmatic body, and referring to the ideal mode of deposit element zone which is proposed first by Russian geochemist, this paper puts forward the ideal mode of the distribution of the magma hydrothermal deposits, which is also called “ore-forming system around magmatic rock center”. This mode is centred on the top rock mass which intrudes to the near surface surrounding rocks, and it is divided into inner zone, transition zone, medium zone and outer zone. The mode scatters by hypothermal deposits, mesothermal deposits and epithermal deposits from inner zone to outer zone regularly. Inner zone is mainly distributed by the deposits which usually form in the magmatic rock such as Nb,Ta,Hf, Li. These deposits are equiaxed shapes because they are controlled by the magmatic rocks. Transition zone is mainly distributed by hypothermal deposits such as W, Sn, Mo, Bi, which are mostly three dimensional. Medium zone is mainly distributed by mesothermal deposits such as Cu, Pb, Zn with lenticular shape and vein shape. Outer zone is mainly distributed by epithermal deposits such as Au, Hg, Sb, which are mostly nervation and beaded shape along the tectonic fissure. Ore forming around the magmatic center has its own unique formation process: after magmatic rock intruding to the hydrous surrounding rock, there is a partly high temperature field which is the key leading to the hydrothermal deposits material cycle and spatial and temporal temperature difference in the temperature field. Individuals which formed under the ideal mode are controlled by the forming condition: the depth of intrusive magmatic rock, the lithology or property of water bearing of surrounding rock; physicochemical property of magma, intrusive temperature, magma scale can all cause the integrity of magmatic center metallogenic series and shape variation.

Key words: magmatic center, oreforming system, ideal mode of deposit spatial zonation, generation rule of individuality

京ICP备08011785号-7
Copyright © Geoscience, All Rights Reserved.
Tel: 010-82322463　E-mail: xddz@cugb.edu.cn
Powered by Beijing Magtech Co., Ltd.