The Infrared Spectroscopy Characteristics of Alteration and Mineralizationin the Porphyry Copper Deposit in Pulang, Yunnan Province

GUO Dong-xu; LIU Xiao; ZHANG Hai-lan; ZHANG Zhi-guo

doi:10.15898/j.cnki.11-2131/td.202005060002

Rock and Mineral Analysis > 2021 > 40(5): 698-709. > DOI: 10.15898/j.cnki.11-2131/td.202005060002

GUO Dong-xu, LIU Xiao, ZHANG Hai-lan, ZHANG Zhi-guo. The Infrared Spectroscopy Characteristics of Alteration and Mineralizationin the Porphyry Copper Deposit in Pulang, Yunnan Province[J]. Rock and Mineral Analysis, 2021, 40(5): 698-709. DOI: 10.15898/j.cnki.11-2131/td.202005060002

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The Infrared Spectroscopy Characteristics of Alteration and Mineralizationin the Porphyry Copper Deposit in Pulang, Yunnan Province

Core and Samples Centre of Land and Resources, Sanhe 065201, China

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Received Date: May 05, 2020
Revised Date: August 04, 2020
Accepted Date: June 01, 2021
Published Date: September 27, 2021

Abstract

HIGHLIGHTS
(1) In order to obtain accurate and precise metal isotopes data, two principles must be followed.No analyzed and interfering elements to be introduced; and no loss of analyzed elements.

(2) Acid dissolution method (including Teflon bombs and microwave digestion) is a common technique for metal isotope analysis.

(3) HClO₄ must be removed thoroughly at high temperature during sample digestion, because its strong oxidization will destroy the effectiveness of resins.

(4) When the same volume of resin is put into the column, the thinner the column is, the slower the flow rate of the eluent.

ABSTRACT

BACKGROUNDInfrared spectroscopy technology, as a green, fast, non-destructive and accurate mineral detection technology, has drawn widespread attention of geologists all over the world in recent years. In view of the high superposition of altered minerals in porphyry deposits, the inconspicuous alteration zone boundaries, many fine-grain altered minerals, and clay altered minerals, this technology has outstanding advantages in the identification of altered minerals and interpretation of exploration information.
OBJECTIVESTo analyze the characteristics of alteration and mineralization of the porphyry copper deposit in Pulang, Yunnan Province, and to provide the basis theory for porphyry copper deposits (especially in the Pulang deposit) exploration.
METHODSThe core samples in the drill ZK1801 were detected using HyLogger-3 through infrared spectroscopy technology, and the spectral data was processed and analyzed by TSG 8.0.
RESULTSK-silicate alteration, epidote-chlorite alteration, chlorite-illite alteration, quartz-illite alteration and clay alteration were identified in the Pulang porphyry copper deposit. The main altered minerals included quartz, potassium feldspar, sericite, chlorite, epidote, kaolinite, smectite and illite. According to the characteristics of mineralization, it was found that copper ore bodies were widely present in the potassium silicate zone and epidote-chlorite zone.
CONCLUSIONSQuartz+potash, feldspar+sericite and epdote+chlorite can be typical altered mineral assemblages for exploration of the Pulang porphyry copper deposit. The Al-OH wavelength from 2210nm to 2205nm of sericite (long-wave sericite) is closely related to mineralization, which can be used as an indicator for prospecting in the Pulang deposit.
- infrared spectroscopy,
- alteration minerals,
- alteration zonation,
- K-silicate alteration,
- chlorite-chlorite alteration,
- porphyry copper deposit,
- Pulang

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