Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

Yin, Q. Z.

doi:10.15666/aeer/1503_477508

Cited by 15 publications

(5 citation statements)

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“…Geochemical compositions of the Xietongmen ore‐bearing porphyries: (a) TAS diagram; (b) SiO 2 versus K 2 O diagram; (c) A/CNK versus A/NK. Literature data for the Xietongmen No.I and No.II ore‐bearing porphyries refer to Huang, Tang, Lang, Zhang, and Chen (), Qu et al (), Tafti (), and Yin et al ()…”

Section: Resultsmentioning

confidence: 99%

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Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

et al. 2019

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The Xietongmen large deposit is the only known subduction-related porphyry Cu deposit in the Gangdese Belt, Tibet, which is composed of the No. I and No. II deposits. Previous work suggests that the No. I deposit is reduced while the No. II deposit is oxidized. However, it is ambiguous that both oxidized and reduced porphyry Cu deposits occur in close proximity, in the same tectonic setting, and within a short time period. Detailed examination of the ages, whole-rock geochemistry, zircon and apatite compositions of the Xietongmen No. I and No. II ore-bearing porphyries are conducted to investigate their magma characteristics and the genetic types of the Xietongmen No. I and No. II deposits. Zircon U-Pb dating results show that the Xietongmen No. I and No. II ore-bearing porphyries formed at 166.3 ± 2.6 Ma and 175.5 ± 1.0 Ma, respectively. The Xietongmen No. I and No. II ore-bearing porphyries have similar mineral assemblage (containing amphibole phenocryst), high Sr/Y ratios and negligible negative Eu anomalies, low Ti-in-zircon temperatures (633−749 and 633−763 C, respectively), which indicate that their magmas are water-rich. In addition, the Xietongmen No. I and No. II ore-bearing porphyries have: (a) high wholerock V/Sc ratios (10−15 and 8−16, respectively); (b) high zircon Ce 4+ /Ce 3+ and Eu N / Eu N * ratios, falling into the field of the ore-bearing intrusions in northern Chile; (c) low apatite Ce N /Ce N * ratios (0.97−1.02 and 0.99−1.02, respectively), which suggest that their magmas are oxidized. The estimated magmatic S contents, based on the magmatic apatite SO 3 contents, yield 0.0113−0.0507 wt% and 0.0012 −0.0118 wt%, respectively for the Xietongmen No. I and No. II ore-bearing porphyries, which suggest their magma are sulfur-rich. Hydrous, oxidized and sulfur-rich magmas are the parent magma of oxidized porphyry Cu deposits, together with the oxidized minerals of hematite and magnetite, therefore, both Xietongmen No. I and No. II deposit are oxidized porphyry Cu deposits, rather than that the Xietongmen No. I deposit is a reduced porphyry Cu deposit. K E Y W O R D S porphyry Cu deposit, zircon, apatite, oxidation state, Xietongmen

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Section: Resultsmentioning

confidence: 99%

“…I and No. II ore‐bearing porphyries refer to Huang et al (), Qu et al (), Tafti (), and Yin et al (). MORB, mid‐ocean ridge basalt; ORG, ocean ridge granite; Syn‐COLG, syn‐collision granite; VAG, volcanic arc granite; WPG, within‐plate granite…”

Section: Discussionmentioning

confidence: 99%

Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

et al. 2019

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“…This indicates that the sandstones most likely formed in an oceanic island arc rather than a continental island arc. Similarly, the Jurassic igneous rocks in the Xiongcun porphyry copper–gold district were also interpreted to have been generated within an oceanic island-arc system (Tang et al 2015; Lang et al 2017; Ma et al 2017 b ; Yin et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Over the past few years, some studies have reported that the geological setting of the southern Lhasa subterrane was a continental island-arc setting during the Late Triassic–Jurassic period (e.g. Yang et al 2008; Zhu et al 2008; Ji et al 2009; Guo et al 2013; Meng et al 2016 a , b ; Wang et al 2016; Ma et al 2017 a ), whereas others have suggested that it was probably an oceanic island-arc setting (Aitchison, Ali & Davis, 2007; Kang et al 2014; Huang et al 2015; Tang et al 2015; Lang et al 2017; Ma et al 2017 b ; Ma, Yi & Xu, 2017; Yin et al 2017). This controversy limits our understanding of the tectonic evolution of the southern Lhasa subterrane.…”

Section: Introductionmentioning

confidence: 99%

Detrital zircon geochronology and geochemistry of Jurassic sandstones in the Xiongcun district, southern Lhasa subterrane, Tibet, China: implications for provenance and tectonic setting

et al. 2018

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Jurassic sandstones in the Xiongcun porphyry copper–gold district, southern Lhasa subterrane, Tibet, China were analysed for petrography, major oxides and trace elements, as well as detrital zircon U–Pb and Hf isotopes, to infer their depositional age, provenance, intensity of source-rock palaeo-weathering and depositional tectonic setting. This new information provides important evidence to constrain the tectonic evolution of the southern Lhasa subterrane during the Late Triassic – Jurassic period. The sandstones are exposed in the lower and upper sections of the Xiongcun Formation. Their average modal abundance (Q21F11L68) classifies them as lithic arenite, which is also supported by geochemical studies. The high chemical index of alteration values (77.19–85.36, mean 79.96) and chemical index of weathering values (86.19–95.59, mean 89.98) of the sandstones imply moderate to intensive weathering of the source rock. Discrimination diagrams based on modal abundance, geochemistry and certain elemental ratios indicate that felsic and intermediate igneous rocks constitute the source rocks, probably with a magmatic arc provenance. The detrital zircon ages (161–243 Ma) and εHf(t) values (+10.5 to +16.2) further constrain the sandstone provenance as subduction-related Triassic–Jurassic felsic and intermediate igneous rocks from the southern Lhasa subterrane. A tectonic discrimination method based on geochemical data of the sandstones, as well as detrital zircon ages from sandstones, reveals that the sandstones were most likely deposited in an oceanic island-arc setting. These results support the hypothesis that the tectonic background of the southern Lhasa subterrane was an oceanic island-arc setting, rather than a continental island-arc setting, during the Late Triassic – Jurassic period.

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“…The Gangdese belt is a key metallogenic region within the Qinghai-Tibet Plateau collisional orogenic belt, where both continental collision porphyry Cu-Mo and magmatic arc porphyry Cu-Au deposits have been discovered, with their formation considered to be closely related to adakites [2,7,15,16,21,[35][36][37][38]. In terms of the metallogenic time scale, typical large to giant porphyry deposits within the Gangdese belt mainly formed during the Cenozoic collisional orogenic stage.…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis and Metallogenesis of Late Cretaceous Adakites in the Nuri Large Cu-W-Mo Deposit, Tibet, China: Constraints from Geochronology, Geochemistry, and Hf Isotopes

Wu,

Wang,

Shi

et al. 2024

Minerals

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The Gangdese metallogenic belt in Tibet is an important polymetallic metallogenic belt formed during the subduction of the Neo-Tethys Ocean and subsequent India–Asia collision. Adakitic rocks are widely distributed in this belt and are considered to be closely related to porphyry–skarn Cu-Mo polymetallic mineralization. However, the petrogenesis and geodynamic setting of the Late Cretaceous adakites in the Gangdese belt remain controversial. In this study, we focus on the quartz diorite in the Nuri Cu-W-Mo deposit along the southern margin of the eastern Gangdese belt. LA-ICP-MS zircon U-Pb dating yields a Late Cretaceous age of 93.6 ± 0.4 Ma for the quartz diorite. Whole-rock geochemistry shows that the quartz diorite possesses typical adakitic signatures, with high SiO2, Al2O3, and Sr contents, but low Y and Yb contents. The relatively low K2O content and high MgO, Cr, and Ni contents, as well as the positive zircon εHf(t) values (+6.58 to +14.52), suggest that the adakites were derived from the partial melting of the subducted Neo-Tethys oceanic slab, with subsequent interaction with the overlying mantle wedge. The Late Cretaceous magmatic flare-up and coeval high-temperature granulite-facies metamorphism in the Gangdese belt were likely triggered by Neo-Tethys mid-ocean ridge subduction. The widespread occurrence of Late Cretaceous adakitic intrusions and associated Cu mineralization in the Nuri ore district indicate a strong tectono-magmatic-metallogenic event related to the Neo-Tethys subduction during this period. This study provides new insights into the petrogenesis and geodynamic setting of the Late Cretaceous adakites in the Gangdese belt, and has important implications for Cu polymetallic deposit exploration in this region.

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Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

Cited by 15 publications

References 71 publications

Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

Detrital zircon geochronology and geochemistry of Jurassic sandstones in the Xiongcun district, southern Lhasa subterrane, Tibet, China: implications for provenance and tectonic setting

Petrogenesis and Metallogenesis of Late Cretaceous Adakites in the Nuri Large Cu-W-Mo Deposit, Tibet, China: Constraints from Geochronology, Geochemistry, and Hf Isotopes

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