The formation process and Mo (W) mineralizaton of the skarn in the Nannihu-Sandaozhuang Mo (W) deposit

XIANG Jun-feng; PEI Rong-fu; XING Bo; WANG Chun-yi; TIAN Zhi-heng; CHEN Xiao-dan; YE Hui-shou; WANG Hao-lin

doi:10.12029/gc20160622

2016 Vol. 43, No. 6

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Article navigation > Geology in China > 2016 > (6): 2131-2153

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XIANG Jun-feng, PEI Rong-fu, XING Bo, WANG Chun-yi, TIAN Zhi-heng, CHEN Xiao-dan, YE Hui-shou, WANG Hao-lin. The formation process and Mo (W) mineralizaton of the skarn in the Nannihu-Sandaozhuang Mo (W) deposit[J]. Geology in China, 2016, (6): 2131-2153. doi: 10.12029/gc20160622

Citation:

XIANG Jun-feng, PEI Rong-fu, XING Bo, WANG Chun-yi, TIAN Zhi-heng, CHEN Xiao-dan, YE Hui-shou, WANG Hao-lin. The formation process and Mo (W) mineralizaton of the skarn in the Nannihu-Sandaozhuang Mo (W) deposit[J]. Geology in China, 2016, (6): 2131-2153. doi: 10.12029/gc20160622

The formation process and Mo (W) mineralizaton of the skarn in the Nannihu-Sandaozhuang Mo (W) deposit

1.
MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Geological Survey Institute of Inner Mongolia Autonomous Region/Key Laboratory of Magmatic-Mineraization and Ore-prospecting of Inner Mongolia Autonomous Region, Huhhot 010020, Inner Mongolia, China
3.
China Molybdenum Co., Ltd., Luoyang, 471542, Henan, China
4.
Luanchuan Longyu Molybdenum Ltd., Luoyang, 471500, Henan China

Received Date: 07 December 2015

Revised Date: 15 November 2016

Publish Date: 24 December 2016

Abstract

Abstract

Based on field observation and microscopic and backscattered electron (BSE) images, the authors recognized a two-stage formation process of the skarn in the Nannihu-Sandaozhuang Mo (W) deposit. At the first stage, the fluid reacted with marble to form wollastonite, andradite, grossularite, hedenbergite and diopside. As the fluid migrated outward, the dark limestone was replaced by diopside skarn or wrigglite diopside skarn. At the second stage, the fluid spread into the wall rock along fractures to form new skarn which was superimposed on the earlier skarn. According to these observations, the skarn minerals such as garnet and pyroxene could be divided into two generations. The first generation of garnet GrtI) (Gro3-82And15-96) is spot-like in wollastonite marble or skarn, and the first generation of pyroxene (PxI) (Di18-86Hd13-70Jo0-13) could intergrow with GrtI in wollastonite marble or skarn and with plagioclase (Ab55-70An30-44) in wrigglite diopside skarn. The second generation of garnet (GrtII) (Gro23-58And37-74) and the second generation of pyroxene (PxII) (Di0-68Hd28-84Jo3-16) were superimposed on GrtI and PxI with smaller space area. The mineralization of molybdenite and scheelite commenced at the very beginning of skarnization and covered the whole skarn formation process. The local reducing environment, induced by the reaction between the fluid with adequate concentration of Mo and W elements and the wall rocks might have triggered metal precipitation.
- eastern Qinling /
- western Henan Province /
- Sandaozhuang /
- skarn /
- molybdenite