楚雄盆地六苴砂岩型铜矿床成矿流体性质及演化

doi:10.13278/j.cnki.jjuese.201602109

Abstract

Abstract:

Liuju copper deposit is one of the typical terrestrial sandstone-type deposits, and which is located in the Meso-Cenozoic red-bed basin of South China. The mineralization occurred in the interface between the purple and grey beds of medium-fine grained sandstone strata. Besides, Hematite, chalcocite, bornite, chalcopyrite, and pyrite coexist in this transitional zone from the purple bed to grey bed, a horizontal metallic mineral zone. Aiming at the ore-forming fluid evolution and mineralization mechanism, this paper focuses on the characteristics of fluid inclusions on the basis of mineralization types and mineralizing periods. The fluid mineralization of Liuju deposit can be divided into diagenesis period and tectonic-reworked period; the latter can be further divided into early and late stages. In the two stages, fluid inclusions are predominated by pure-liquid type aqueous inclusions and gas-liquid aqueous inclusions with rich liquid. The homogenization temperatures of the three stages experienced an evolution trend as follows:increased from 96-164℃ to 108-227℃, then decreased to 94-159℃; while the salinities(w(NaCl)) were slightly decreased from 2.7%-16.7% to 2.1%-13.8%, then 1.2%-13.5%, showing little difference. Generally, all the three stages of the ore-forming fluid were medium-low temperature and medium-low salinity basin brine. By the petrographic feature observation and the laser raman spectroscopy test of the gas component in fluid inclusions, it was confirmed that small amounts of hydrocarbon fluid inclusions were contained in the diagenesis period; while small amounts of three-phase CO₂ inclusions were found in the tectonic-reworked period. Besides, their grouped fluid compositions are different. The ore-forming fluid experienced a trend as follows:the gas component changed from the reducing organic-rich end (CH₄) to the relatively oxidizing end (CO₂) in the N₂-CH₄-CO₂ triangular diagram; meanwhile, the ionic component changed from the rich SO₄^2-(-Cl^-)-Ca²⁺-K⁺ type to the rich Cl^--Na⁺ type. Different properties of ore-forming fluids played different roles in the mineralization of bedded orebodies and veined orebodies. During the ore-forming fluid evolution, the disseminated or laminated ores in sandstone-type copper deposits were formed in the diagenesis period; while, the high-grade banded, veined ores on the base of bedded orebody controlled by the fracture are formed during the further evolution in tectonic-reworked period.

Key words: sandstone-type copper deposit, fluid inclusions, ore-forming fluid evolution, metallogenetic process, Liuju, Chuxiong basin

CLC Number:

P618.41

Wu Haizhi, Han Runsheng, Wu Peng. Properties and Evolution of Ore-Forming Fluid in Liuju Sandstone Type Copper Deposit, Chuxiong Basin in Yunnan Province[J].Journal of Jilin University(Earth Science Edition), 2016, 46(2): 398-411.

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Properties and Evolution of Ore-Forming Fluid in Liuju Sandstone Type Copper Deposit, Chuxiong Basin in Yunnan Province

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