Fluid-rock reactions of the Triassic Taiyangshan porphyry Cu-Mo deposit (West Qinling, China) constrained by QEMSCAN and iron isotope

Qiu, Kaibin; Hou, Zhaoliang; Pirajno, Franco; Shivute, Espine; Cai, Yi-Wei

doi:10.1016/j.oregeorev.2021.104068

Cited by 17 publications

(4 citation statements)

References 82 publications

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“…If zircons with positive ε Hf ( t ) values are interpreted as the recycling of Neoproterozoic crustal materials, the age of the early Neoproterozoic crustal accretion activities (1220–705 Ma, especially 970–720 Ma) in the north to the western margin of the SCB (Cai et al, 2021; Liu, Yang, et al, 2015; Wang, Xu, & Santosh, 2019; Wang et al, 2021; Wu et al, 2019), which are rare in the NCB, is equivalent to the T DM2 age of zircons with positive ε Hf( t ) values, indicating that the Neoproterozoic materials on the northern SCB have involved the source magma of the Permian tuff in the Zuoshan section. Referring to middle and late Triassic magmatic records related to subduction and collision of the Mianlue Ocean in western Qinling Orogenic Belt (Gou et al, 2019; Zhang, Qiu, et al, 2021), the zircons with positive ε Hf ( t ) values, interpreted as the addition of juvenile mantle‐derived materials, occur in the syn‐collisional to post‐collisional (210–220 Ma) granites (Figure 11; Ping et al, 2013; Qin et al, 2013; Yang, Liu, et al, 2012), also supporting that the zircons with positive ε Hf ( t ) value from the Permian tuff can be used as an indicator of the beginning of the continental subduction and continent‐continent collision.…”

Section: Discussionmentioning

confidence: 99%

Age, genesis, and geological significance of Permian–Triassic boundary volcanic tuffs in the northeastern margin of South China

Xie

et al. 2023

Geological Journal

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The Permian-Triassic boundary (PTB) volcanic tuffs are widely distributed in the East Palaeo-Tethys region, but their age and origin have been controversial. The Permian-Triassic deep-water sediments in the northeastern margin of South China are favourable research objects, and we report new results from the PTB deep basin sediments in the Susong area, Anhui Province, in this paper. Two volcanic tuffs are found in the Zuoshan PTB in the Zuoshan section, and Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon dating indicates that the upper and lower tuffs are 251.3 ± 1.7 Ma and 252.3 ± 2.1 Ma, respectively. The PTB age is 251.6 Ma according to a numerical interpolation method of the average deposition rate of the PTB. Fusulinids and non-fusulinid foraminifers in the limestone overlying the lower tuff define the rock as end-Permian. Zircon trace elements show that both tuffs are sourced from felsic volcanism in continental arc background, and their source magmas were derived from the continental crust. Zircons of PTB age from the upper tuff on the bottom of the Triassic have negative ε Hf (t) value from À8.02 to À3.75, and the Palaeo-Mesoproterozoic two-stage model ages of 1502-1780 Ma, showing that their source rocks were only derived from the remelting of the Palaeo-Mesoproterozoic continental crust. The zircons from the lower tuff on the top of the Permian show two types, including negative ε Hf (t) values from À6.48 to À1.25 and Palaeo-Mesoproterozoic two-stage model ages of 1350-1679 Ma, and positive ε Hf (t) values from +3.98 to +10.15, and Neoproterozoic two-stage model ages of 629-1023 Ma, indicating that their sources were derived from the reworking of the Palaeo-Mesoproterozoic continental crust and early Neoproterozoic depleted mantle joined in juvenile crust growth in the northern margin of the South China Block at the beginning of the collision between the South China and North China blocks. The initial collision started no later than 252.3 Ma and developed significantly from east to west.

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Section: Discussionmentioning

confidence: 99%

Age, genesis, and geological significance of Permian–Triassic boundary volcanic tuffs in the northeastern margin of South China

Xie

et al. 2023

Geological Journal

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“…The Mianlue Suture Zone is the boundary between the South Qinling Belt and the South China Block, which mainly comprises dismembered ophiolitic sequences, ocean-island basalts, and island arc volcanic rocks [4,28]. As the western segment of the Qinling Belt, the West Qinling Belt is contiguous to the East Qinling Belt and is bounded by the Huicheng basin or Foping dome [19,[28][29][30]. In the West Qinling Belt, the Precambrian basement is overlain by the Phanerozoic sedimentary rocks and all the strata are intruded by the Triassic granitoid (Figure 1b) [31,32].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…In the West Qinling Belt, the Precambrian basement is overlain by the Phanerozoic sedimentary rocks and all the strata are intruded by the Triassic granitoid (Figure 1b) [31,32]. As the western segment of the Qinling Belt, the West Qinling Belt is contiguous to the East Qinling Belt and is bounded by the Huicheng basin or Foping dome [19,[28][29][30]. In the West Qinling Belt, the Precambrian basement is overlain by the Phanerozoic sedimentary rocks and all the strata are intruded by the Triassic granitoid (Figure 1b) [31,32].…”

Section: Geological Backgroundmentioning

confidence: 99%

Timing, Provenance, and Tectonic Implications of Ore-Hosting Metasedimentary Rocks in the Giant Liba Gold Deposit, West Qinling Belt, China

Zhang

Liu

et al. 2022

Minerals

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The closure time of the Shangdan Ocean is critical for understanding the tectonic evolution of the Proto-Tethys Ocean. However, the proposed closure time was prolonged from Ordovician to Devonian. In the present study, detrital zircon from the metasedimentary rocks of the Liba Group in the West Qinling Belt was analyzed to constrain the closure time of the Shangdan Ocean. The three youngest grains from the Liba Group yield a maximum deposition age of 418 ± 13 Ma, indicating the Middle Devonian deposition. Detrital zircon grains show two main U–Pb age peaks of 810 Ma and 440 Ma with εHf(t) values spanning from −24.3 to +8.8 and −6.3 to +4.1, respectively, suggesting that the sediments of the Liba Group were derived from both the North and South Qinling Belts. The Lower Devonian in the South Qinling Belt shows similar provenance to the Liba Group, whereas sediments from the North Qinling Belt are absent in the Silurian strata of the South Qinling Belt. From Late Silurian to Early Devonian, the tectonic setting changed from subduction to collision. This evidence consistently suggests the disappearance of the Shangdan Ocean. The noticeable decrease in magmatism from 510–420 Ma to 420–390 Ma and the shrinking of εHf(t) values from −15.5–+12.8 to −8.4–+4.2 reveal that the Shangdan Ocean, as the eastmost embranchment of the Proto-Tethys Ocean, was closed at ca. 420 Ma.

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“…The iron isotope fractionation in low-temperature pyrite has been used to trace modern and ancient microbial metabolisms, redox evolution of the oceans and atmosphere, and iron sources and cycling in sedimentary environments. 19,22,34,35 More recently, the Fe isotopic composition of pyrite is suggested to shed light on the formation of various types of sulde ore deposits, including magmatic-hydrothermal Sn-W deposits, 36 hydrothermal Au deposits, [37][38][39] porphyry Cu (-Mo) deposits, [40][41][42][43] skarn Cu-Fe deposits, 44 epigenetic sediment-hosted Cu-Co deposits, 45 sediment-hosted stratiform sulde deposits, 46 and sulde deposits on the modern seaoor. [47][48][49] The chemical zoning of pyrite can record a wealth of information during magma evolution and metamorphic reaction (e.g., ref.…”

Section: Introductionmentioning

confidence: 99%

Tianyu-Py pyrite: a new natural reference material for micro-beam determination of iron isotopic ratios

Chen

Feng

et al. 2022

J. Anal. At. Spectrom.

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Fluid-rock reactions of the Triassic Taiyangshan porphyry Cu-Mo deposit (West Qinling, China) constrained by QEMSCAN and iron isotope

Cited by 17 publications

References 82 publications

Age, genesis, and geological significance of Permian–Triassic boundary volcanic tuffs in the northeastern margin of South China

Age, genesis, and geological significance of Permian–Triassic boundary volcanic tuffs in the northeastern margin of South China

Timing, Provenance, and Tectonic Implications of Ore-Hosting Metasedimentary Rocks in the Giant Liba Gold Deposit, West Qinling Belt, China

Tianyu-Py pyrite: a new natural reference material for micro-beam determination of iron isotopic ratios

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