A Study on Alteration Mineral Assemblages and Mineralization Characteristics of a Wunugetushan Porphyry Copper-Molybdenum Deposit in Inner Mongolia, China, Based on Infrared Spectroscopy

LIU Xin-xing; ZHANG Hong; ZHANG Juan; SHI Wei-xin; ZHANG Xin-le; CHENG Jia-wei; LU Ke-xuan

doi:10.15898/j.cnki.11-2131/td.202005060010

Rock and Mineral Analysis > 2021 > 40(1): 121-133. > DOI: 10.15898/j.cnki.11-2131/td.202005060010

LIU Xin-xing, ZHANG Hong, ZHANG Juan, SHI Wei-xin, ZHANG Xin-le, CHENG Jia-wei, LU Ke-xuan. A Study on Alteration Mineral Assemblages and Mineralization Characteristics of a Wunugetushan Porphyry Copper-Molybdenum Deposit in Inner Mongolia, China, Based on Infrared Spectroscopy[J]. Rock and Mineral Analysis, 2021, 40(1): 121-133. DOI: 10.15898/j.cnki.11-2131/td.202005060010

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A Study on Alteration Mineral Assemblages and Mineralization Characteristics of a Wunugetushan Porphyry Copper-Molybdenum Deposit in Inner Mongolia, China, Based on Infrared Spectroscopy

1.
Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China
2.
Core and Samples Center of Land and Resources, China Geological Survey, Sanhe 065201, China

More Information

Received Date: May 05, 2020
Revised Date: October 15, 2020
Accepted Date: December 10, 2020
Published Date: January 27, 2021

Abstract

HIGHLIGHTS
(1) The alteration minerals in a Wunugetushan copper molybdenum deposit were identified by short-wave infrared spectroscopy and thermal infrared spectroscopy.

(2) The alteration minerals in a Wunugetushan copper molybdenum deposit have obvious zonation, and the mineralization of the deposit was significantly correlated with the alteration zoning. The alteration assemblages of mineralized positions were mainly quartz+illite+sericite+potassium feldspar.

(3) The wavelength shift at the 2200nm absorption peak of sericite was closely related to the mineralization center, which can help to determine the mineralization center.

ABSTRACT

BACKGROUNDIn recent years, infrared spectroscopy and thermal infrared spectroscopy have played an important role in mineralogy research, geological exploration and prospecting.
OBJECTIVESTo investigate alteration minerals and mineralization features of a Wunugetushan porphyry copper-molybdenum deposit in Inner Mongolia.
METHODSCore samples were scanned by infrared spectroscopy core scanning system and analyzed by TSG 8.0.
RESULTSThe alteration minerals of the Wunugetushan porphyry copper molybdenum deposit mainly included quartz, potassium feldspar, sericite, illite, kaolinite and montmorillonite. The alteration mineral assemblage showed obvious zonation in space. Quartz+illite+sericite+potassium feldspar had the closest relationship with mineralization and can be used as the standard mineral assemblage for ore prospecting. By comparing with the spatial distribution of Cu and Mo mineralization, the wavelength shift of the absorption peak at 2200nm to shorter wavelengths was closely related to the mineralization center, and the IC value of illite reflects the degree of crystallization and mineralization.
CONCLUSIONSThis technical method can be used to quickly delineate the alteration mineral assemblage of porphyry copper-molybdenum ore through the alteration mineral spectrum, thereby improving the exploration efficiency.
- drill core,
- infrared spectroscopy,
- alteration zonation,
- porphyry copper-molybdenum deposit,
- Wunugetushan

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References (34)

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A Study on Alteration Mineral Assemblages and Mineralization Characteristics of a Wunugetushan Porphyry Copper-Molybdenum Deposit in Inner Mongolia, China, Based on Infrared Spectroscopy