STUDY ON FLUID INCLUSIONS OF MOFANGGOU GOLD DEPOSITS IN PINGYI, WESTERN SHANGDONG

Geoscience ›› 2004, Vol. 18 ›› Issue (4): 529-536.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

STUDY ON FLUID INCLUSIONS OF MOFANGGOU GOLD DEPOSITS IN PINGYI, WESTERN SHANGDONG

HU Hua-bin^1,2, MAO Jing-wen^1,3, NIU Shu-yin², LI Meng-wen³, LIU Tao⁴, LIU Ming⁴

1.China University of Geoscience, Beijing 100083, China
2.Shijiazhuang University of Economics, Shijiazhuang, Hebei 050031, China
3.Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037, China
4.No.2 Geology and Mineral Resources Exploration Institute of Shandong, Yanzhou, Shandong 272100, China

Received:2003-12-25 Revised:2004-09-06 Online:2004-04-20 Published:2004-04-20

Abstract

Abstract:

This paper studies in detail the characteristics of primary fluid inclusions and H, O isotope, which hosted in quartz, calcite and fluorite from alteration samples of Mofanggou and Lifanggou ore districts in Pingyi, western Shangdong. Research indicates that all inclusions, with similar size, shape and types, contain NaCl-H2O solution of vapor and liquid two phases. The temperature of homogenization of the fluid inclusions ranges from 120 to 450℃, and dominates by 120 to 260℃, with a bimodal distribution from 110 to 150℃ and 170 to 250℃. Temperature of gold mineralization ranges from 170 to 250℃. Ice-melting temperature varies from -2.8℃ to -11.5℃,corresponding to a range of salinities from 4.65% to 15.47% NaCl equivalent. δ³⁴S values of pyrites in oredodies and wall rocks range from salinities from -0.71‰ to +2.99‰. δDSMOW and δ¹⁸DSMOW value in calcite and quartz vary from -63‰ to -70‰ and +18.4‰ to + 22.2‰, respectively. These data suggest that fluids originated from mantle and mixed with formation water during later mineralization.

Key words: fluid inclusion, epithermal mineralization, Pingyi, western Shandong

CLC Number:

P618

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STUDY ON FLUID INCLUSIONS OF MOFANGGOU GOLD DEPOSITS IN PINGYI, WESTERN SHANGDONG

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