Importance of Magmatic Water Content and Oxidation State for Porphyry-Style Au Mineralization: An Example from the Giant Beiya Au Deposit, SW China

Bao, Xinshang; Yang, Liqiang; He, Wenjun; Xue, Gang

doi:10.3390/min8100441

Cited by 17 publications

(9 citation statements)

References 43 publications

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“…),Bao et al (2018),Huang et al (2019),Sepidbar et al (2019),Zhou et al (2019),Yang et al (2020), andZheng et al (2020) [Colour figure can be viewed at wileyonlinelibrary.com]…”

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confidence: 99%

Collision‐related porphyry Cu deposits formed by input of ultrapotassic melts into the sulfide‐rich lower crust

et al. 2021

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Collision‐related porphyry Cu deposits (PCDs) are restricted to previous magmatic arcs, in which sulfide‐rich lower crust occurred. Fertile adakite‐like porphyries associated with PCDs have higher K2O contents and K2O/Na2O ratios than barren porphyries emplaced in the same arc. The elevated K2O/Na2O ratios of fertile porphyries reflect substantial inputs of coeval hydrous, oxidized ultrapotassic melts. Input of such melts could increase the water content and oxygen fugacity of the lower‐crust‐derived melts, which in turn would promote the breakdown of sulphides in the lower crust and increase the contents of Cu and S in the melts, making them favourable for the formation of large PCDs. The relatively low K2O contents and K2O/Na2O ratios of barren porphyries indicate limited input of ultrapotassic melts; these magmas have low potential to form PCDs. Thus, the input of ultrapotassic melts into the sulfide‐rich juvenile lower crust drives the formation of collision‐related PCDs.

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“…),Bao et al (2018),Huang et al (2019),Sepidbar et al (2019),Zhou et al (2019),Yang et al (2020), andZheng et al (2020) [Colour figure can be viewed at wileyonlinelibrary.com]…”

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confidence: 99%

Collision‐related porphyry Cu deposits formed by input of ultrapotassic melts into the sulfide‐rich lower crust

et al. 2021

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“…(c) Bao et al. (2018) suggested the magma source of the Beiya deposit is located at about 8 km depth.…”

Section: Discussionmentioning

confidence: 99%

“…(b) It was concluded that metal-rich fluids of large-scale porphyry ore deposits should be supplied from deep (≧6 km) mafic magma chambers (Hou et al, 2020). (c) Bao et al (2018) suggested the magma source of the Beiya deposit is located at about 8 km depth. Moreover, the study area is characterized with anomalously high heat flow values (55-103 mW/m 2 ) that are only less than the highest heat flow values in Yunnan, China (80-120 mW/m 2 , located in the Tengchong volcanic area; Jiang et al, 2018).…”

Section: Upper Crustal Anomaliesmentioning

confidence: 99%

The Influence of the Ailaoshan‐Red River Shear Zone on the Mineralization of the Beiya Deposit on the Southeastern Margin of the Tibetan Plateau Revealed by a 3‐D Magnetotelluric Survey

Wang

et al. 2022

JGR Solid Earth

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The Jinshajiang-Ailaoshan alkaline porphyry Cu, Mu, and Au polymetallic belt is an important Cenozoic metallogenic belt in SW China which extends for over 1,000 km (Figure 1a; W. C. . It is adjacent to the intra-continental Jinshajiang-Red River strike-slip fault system of the Tethys-Himalaya orogenic belt. This belt hosts dozens of economically significant porphyry and skarn ore deposits that are related to potassic porphyritic intrusions (Hou et al., 2017). It is believed to be the result of the long-term interaction between the Indochina and the Yangtze craton and the lateral extrusion of the Indochina block during the continental collisional process of the Tibet and the Indian block (Deng et al., 2015).

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“…In the present case, the temperature range shown is in the range of 828–688°C with an average of 755°C, making it a better candidate for mineralization evident in the Kuthori‐Bagori association (Majumdar & Gogoi, 2020). Higher oxidation increases the SO 2 /H 2 S of the fluid and enhances the ability of ore fluid to scavenge and transport copper (Bao et al, 2018; Wyborn, 2002).…”

Section: Discussionmentioning

confidence: 99%

Geochemistry and magnetite mineral properties in a porphyry copper prospect in A‐type granitoids: A case study from the Karbi Hills of Northeast India

et al. 2022

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This paper discusses the porphyry copper mineralization in A‐type granitoids from the Precambrian shield of the Karbi Hills (Mikir Hills), NE India. The prospective zone lies in the Kuthori‐Bagori of Kaziranga locality of the north Karbi Hills. The host granitoids are characterized by intermediate to high SiO2 (66.30–72.97 wt.%), Na2O (up to 4.90 wt.%), Ba (up to 1,943 ppm), Zr (up to 410 ppm), Y (up to 70 ppm) and Al2O3 (up to 14.77 wt.%) with low concentrations of CaO (up to 1.53 wt.%), and Cu (up to 32.41 ppm) which suggest a consistent granodiorite‐monzogranite host composition, an intraplate emplacement, A‐type chemistry, shoshonitic to high‐K calc‐alkaline and a predominant metaluminous character. Minerals in the investigated granitoids show hypogene alteration features similar to ideal porphyry style mineralization. Remnants of early chalcopyrite‐bornite‐magnetite (Magnetite‐I) veins have been preserved in the distant propylitic zone. The central core zone of potassic alteration shows the dominance of pyrite‐chalcopyrite‐magnetite (Magnetite‐II) assemblages. Mineral chemistry confirms the presence of two types of magnetites: magmatic (Mag‐I) and hydrothermal (Mag‐II). Mag‐I is octahedral, less commonly cubic, or irregular. It has a porous core with trellis‐type ilmenite exsolution lamellae. Mag‐II is non‐porous, devoid of ilmenite exsolution lamellae, has irregular to distinctly octahedral crystal habit and contains micro‐inclusions of pyrite, chalcopyrite, aluminosilicates, manganite and apatite. The progressive chemical purification of igneous magnetite, exacerbated by hydrothermal re‐equilibration, has resulted in a significant reduction in trace element contents such as Ti, Al, Mg, Zn and Cr, and a significant increase in iron content from 89 to ~94 wt.%. A combination of [Ni/(Cr + Mn) vs. Ti + V], and [(Ca + Al + Mn) vs. Ti + V] variation diagrams and upper threshold concentrations for the Kuthori‐Bagori ore effectively separates Mag‐I and Mag‐II. Our field, petrographic and geochemical data indicate that the Kuthori‐Bagori of Kaziranga granitoid of the Karbi Hills (Mikir Hills) in NE India is an ideal location for porphyry copper mineralization.

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Importance of Magmatic Water Content and Oxidation State for Porphyry-Style Au Mineralization: An Example from the Giant Beiya Au Deposit, SW China

Cited by 17 publications

References 43 publications

Collision‐related porphyry Cu deposits formed by input of ultrapotassic melts into the sulfide‐rich lower crust

Collision‐related porphyry Cu deposits formed by input of ultrapotassic melts into the sulfide‐rich lower crust

The Influence of the Ailaoshan‐Red River Shear Zone on the Mineralization of the Beiya Deposit on the Southeastern Margin of the Tibetan Plateau Revealed by a 3‐D Magnetotelluric Survey

Geochemistry and magnetite mineral properties in a porphyry copper prospect in A‐type granitoids: A case study from the Karbi Hills of Northeast India

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