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The Zoning Rule and Forming Mechanism of Tectonite-Mineralized Alteration Lithofacies of “Black/Fracture Zone” of the Daliangzi Pb-Zn Deposit in Southwest Sichuan of China
Version 1
: Received: 21 March 2024 / Approved: 21 March 2024 / Online: 22 March 2024 (03:28:20 CET)
How to cite:
Li, L.; Han, R.; Wu, J.; Feng, Z. The Zoning Rule and Forming Mechanism of Tectonite-Mineralized Alteration Lithofacies of “Black/Fracture Zone” of the Daliangzi Pb-Zn Deposit in Southwest Sichuan of China. Preprints2024, 2024031275. https://doi.org/10.20944/preprints202403.1275.v1
Li, L.; Han, R.; Wu, J.; Feng, Z. The Zoning Rule and Forming Mechanism of Tectonite-Mineralized Alteration Lithofacies of “Black/Fracture Zone” of the Daliangzi Pb-Zn Deposit in Southwest Sichuan of China. Preprints 2024, 2024031275. https://doi.org/10.20944/preprints202403.1275.v1
Li, L.; Han, R.; Wu, J.; Feng, Z. The Zoning Rule and Forming Mechanism of Tectonite-Mineralized Alteration Lithofacies of “Black/Fracture Zone” of the Daliangzi Pb-Zn Deposit in Southwest Sichuan of China. Preprints2024, 2024031275. https://doi.org/10.20944/preprints202403.1275.v1
APA Style
Li, L., Han, R., Wu, J., & Feng, Z. (2024). The Zoning Rule and Forming Mechanism of Tectonite-Mineralized Alteration Lithofacies of “Black/Fracture Zone” of the Daliangzi Pb-Zn Deposit in Southwest Sichuan of China. Preprints. https://doi.org/10.20944/preprints202403.1275.v1
Chicago/Turabian Style
Li, L., Jianbiao Wu and Zhixing Feng. 2024 "The Zoning Rule and Forming Mechanism of Tectonite-Mineralized Alteration Lithofacies of “Black/Fracture Zone” of the Daliangzi Pb-Zn Deposit in Southwest Sichuan of China" Preprints. https://doi.org/10.20944/preprints202403.1275.v1
Abstract
As one of the typical deposits in Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province, the Daliangzi Pb-Zn deposit has a close genetic relation with the structural system of “black/fracture zone” formed under the action of NWW-approx. EW strike-slip structures in the metallogenic province, but the mechanism of rock and ore-controlling action of the structural system remains unclear. Based on detailed analysis of tectonite-mineralized alteration lithofacies of R1 “black/fracture zone”, the tectonite-mineralized alteration lithofacies zones can be divided into 4 types in succession outward from the Pb-Zn mineralization center, i.e., ① brecciated and stockwork-like Pb-Zn mineralization-complex breccia facies zone, ② stockwork-like Pb-Zn mineralization-simple breccia and cataclasite facies zone, ③ veined pyrite-sulfide-dolomitic cataclasite facies zone, and ④ fine-veined calcite-black carbonized dolomite facies zone; Cl- and SO42--rich high-temperature oxidizing ore-bearing fluid mixes with reducing fluid in Zone ① while migration and precipitation occur in Zone ④. With the evolution of ore-forming fluid, the homogenization temperature decreases from Zone ① to Zone ④, the salinity increases from Zone ① to Zone ② and then decreases to Zones ③ and ④, and the fluid density has little change on the whole; the contents of Zn, Pb, Cu, Ga, Ge, Cd, Ag, and other metallogenic elements, the Zn/Pb ratio, and the CaO/MgO mole ratio decrease gradually from Zone ① to Zone ④; and REE fractionation, calcilization, silicification, and pyritization enhance gradually from Zone ① to Zone ④. This series of changes are the product of diapirism (cryptoexplosion) of strike-slip structures and “black/fracture zone”, among which the second-order structures (F5, F100, and other faults) derived from NWW-approx. EW striking dextral shear-tension faults F1 and F15 control the brecciated and stockwork-like Pb-Zn mineralized complex breccia facies zones and the stockwork-like Pb-Zn mineralized simple breccia and cataclasite facies zones. Therefore, this paper establishes the zoning mode of tectonite-mineralized alteration lithofacies of “black/fracture zone” and proposes that Zones ① and ② are important prospecting criteria. conclusions.
Environmental and Earth Sciences, Geochemistry and Petrology
Copyright:
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