Contribution of magma mixing to the formation of porphyry-skarn mineralization in a post-collisional setting: The Machangqing Cu-Mo-(Au) deposit, Sanjiang tectonic belt, SW China

Yang, Mimi; Zhao, Fufeng; Liu, Xianfan; Qing, Hairuo; Chi, Guoxiang; Li, Xingyuan; Duan, Wenjing; Lai, Chun‐Kit

doi:10.1016/j.oregeorev.2020.103518

Cited by 19 publications

(4 citation statements)

References 88 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]…”

mentioning

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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“…The following supporting information can be downloaded at https://www.mdpi.com/xxx/s1: Table S1: Compilation of ages for the Cenozoic potassic rocks within and outside the ARSZ in western Yunnan. References [87][88][89][90][91][92][93][94][95][96][97][98][99][100] are cited in the supplementary materials. [16,24,36,78]).…”

Section: Supplementary Materialsmentioning

confidence: 99%

Petrogenesis and Tectonic Implications of the Oligocene Dalongtan Shoshonitic Syenite Porphyry in Central Yunnan, Southeastern Tibetan Plateau: Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes

Yang,

Liu,

et al. 2024

Minerals

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Shoshonitic rocks are widely distributed in post-collisional settings and provide key information on deep geodynamic mechanisms and magmatic evolution. In this paper, we present petrographic, zircon U-Pb age-related, trace elemental, Hf isotopic, bulk-rock elemental, and Sr-Nd isotopic data of the Dalongtan shoshonitic syenite porphyries (DSSPs) in central Yunnan, southeastern Tibet. The DSSPs formed at 33.2 ± 0.3 Ma in a post-collisional setting. They define linear trends on Harker diagrams, and they display similar trace element patterns and enriched bulk-rock Sr-Nd isotopes [(87Sr/86Sr)i = 0.70964–0.70968, εNd(t) = −12.9 to −12.7] and zircon Hf isotopes (εHf(t) = −15.7 to −13.1) to the coeval mantle-derived potassic mafic rocks. This suggests that the DSSPs were fractionated from the lithospheric mantle-derived mafic magmas. The DSSPs, along with the coeval felsic and mafic magmatic rocks (37.2–32.3 Ma), exhibit a planar distribution on the SE Tibet and predate the left-lateral shearing of the Ailaoshan–Red River shear zone (ARSZ) (32–22 Ma), suggesting that there are no genetic relationships between them. The DSSPs have geochemical characteristics similar to those of A-type granites, with high total alkalinity (10.39–11.17 wt.%), HFSE concentrations (Zr + Nb + Ce + Y = 890.2–1054.3 ppm), Ga/Al ratios (10,000 × Ga/Al = 2.95–3.46), whole-rock zircon saturation temperatures (906–947 °C), and oxygen fugacity (ΔFMQ = +3.30–+4.65), indicating that they are products of the high-temperature melting of the lithosphere as a result of asthenosphere upwelling in extensional settings. Based on our data and regional observations, it is proposed that the generation of the DSSPs may be linked to the convective thinning of the thickened lithospheric mantle following the India–Asia collision.

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“…The widely distributed alkaline volcanic rocks in the Sanjiang belt, which are suggested to be sourced from partial melting of the metasomatised lithospheric mantle (Wang et al, 2021), have high Mg# and Cr and Ni contents similar to the ore‐associated suites at a given SiO 2 content (Figure 2; Table S3), implying that they are genetically related. However, some dacitic ore‐associated samples from the Beiya and Machangqing deposits have lower Mg# of ~40 and Cr and Ni contents of ~5–10 ppm (Figure 2), suggesting that the magmas may have undergone substantial crustal assimilation or mixed with felsic crust‐derived magmas (He et al, 2016; Yang et al, 2020).…”

Section: Petrogenesis Of the Ore‐associated Suitesmentioning

confidence: 99%

A metasomatised mantle origin for post‐collisional porphyry ore‐forming magmas in the Sanjiang metallogenic belt, Southwest China

Hao

Park

2023

Terra Nova

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We constrain the magma sources of representative post‐collisional ore‐associated and barren suites in the Sanjiang metallogenic belt, Southwest China. The ore‐associated suites generally have higher Mg# and Cr and Ni contents than the crustal melts. Also, they show wide ranges of whole‐rock Nd and zircon Hf isotopes that are similar to the subduction‐modified mantle‐derived alkaline volcanic rocks in the region. Combing with the geochemical model, we suggest that the ore‐associated suites dominantly originated from partial melts of subduction‐metasomatised mantle by fractional crystallisation. In contrast, the barren suites are mainly characterised by low Mg# and Cr and Ni contents that are comparable to the crustal melts and they have enriched whole‐rock Nd and zircon Hf isotopes, indicating a metasomatised lower crustal origin. The different magma sources play an important role in controlling the fertility of contemporary ore‐associated and barren magmatic suites during post‐collisional porphyry ore formation.

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Contribution of magma mixing to the formation of porphyry-skarn mineralization in a post-collisional setting: The Machangqing Cu-Mo-(Au) deposit, Sanjiang tectonic belt, SW China

Cited by 19 publications

References 88 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

Petrogenesis and Tectonic Implications of the Oligocene Dalongtan Shoshonitic Syenite Porphyry in Central Yunnan, Southeastern Tibetan Plateau: Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes

A metasomatised mantle origin for post‐collisional porphyry ore‐forming magmas in the Sanjiang metallogenic belt, Southwest China

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