Late Triassic to Middle Jurassic tectonic evolution of the South China Block: Geodynamic transition from the Paleo-Tethys to the Paleo-Pacific regimes

Xu, Xianbing

doi:10.1016/j.earscirev.2023.104404

Cited by 11 publications

(3 citation statements)

References 169 publications

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“…These Indosinian granitoids are late-collisional and formed in a locally extensional environment, which is typical for Chuankou W deposits in the east of Hengyan Basin [54]. The Jurassic Era witnessed the low-angle subduction of the Paleo-Pacific Plate, which resulted in NNE-striking faults, basin-range tectonics, and associated alkaline-sub-alkaline magmatism within the SCB [51,88]. The development of the Hengyan Basin and the widespread intrusions in Shuikoushan are features of the intracontinental lithospheric extension setting for the Late Mesozoic period (175-80 Ma) [87,88].…”

Section: Magma Generation In Extensional Settingmentioning

confidence: 99%

Deeply Derived Magma Controlling the Polymetallic Mineralization at Shuikoushan, South China: Constraints from Mineral U–Pb Dating and Whole-Rock Geochemistry

Wang,

Du,

Zhang

et al. 2023

Minerals

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Various magmatic–hydrothermal activities have resulted in different styles of polymetallic mineralization in South China. Shuikoushan is a large Fe-Cu-Pb-Zn-Au-Ag orefield situated in fold-and-thrust belts within the South China Block. Two types of granodiorite have been identified in recent drilling work. The early-stage, coarse-grained granodiorite has developed magnetite-bearing skarns in the deep level. The late-stage, fine-grained granodiorite is associated with garnet-hematite–magnetite–pyrite–sphalerite–chalcopyrite-bearing skarns in its contact zone. Away from the garnet-bearing skarn are calcite–quartz–pyrite–sphalerite–galena veinlets in faulted breccia. Fieldwork has identified iron mineralization in both skarns, whereas copper mineralization was only discovered in the garnet-bearing skarns. Lead, zinc, gold, and silver mineralization were observed in the garnet-bearing skarns and faulted breccia. Zircon U–Pb analyses suggested the emplacement of two granodiorite at 167.8 ± 0.8 Ma (MSWD = 1.1, N = 31) and 163.6 ± 0.7 Ma (MSWD = 1.3, N = 32). Apatite and garnet U–Pb dating further indicated the magnetite-bearing skarns of 166.2 ± 1.9 Ma (MSWD = 4.5, N = 27), the hematite–magnetite–sulfide-bearing skarns of 158.6 ± 2.8 Ma (MSWD = 1.3, N = 34), and the calcite–quartz–sulfide veinlets of 159.5 ± 5.2 Ma (MSWD = 1.7, N = 24). The time–space relationship between the two intrusions and hydrothermal activities suggests that the fine-grained granodiorite is responsible for polymetallic mineralization. Whole-rock geochemistry analyses demonstrated the enrichment of LILEs and the depletion of Nb and Ta in two granodiorites, with a slight enrichment in LREEs and flat HREE patterns. These granodiorite bodies therefore belong to high-K calc-alkaline magma generated via the crust’s partial melting. The fine-grained granodiorite generally has a lower HREE and higher Dy/Yb, Sr/Y ratios than coarse-grained granodiorite, corresponding to the source of magma in garnet stable lower crust. The residual garnet keeps ferric iron in melts, leaving the fine-granodiorite more oxidized for copper and gold concentration. Through these analyses and our drilling work, a continuous skarn–hydrothermal–epithermal system has been identified for Cu-Pb-Zn-Au-Ag targeting in Shuikoushan.

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Section: Magma Generation In Extensional Settingmentioning

confidence: 99%

Deeply Derived Magma Controlling the Polymetallic Mineralization at Shuikoushan, South China: Constraints from Mineral U–Pb Dating and Whole-Rock Geochemistry

Wang,

Du,

Zhang

et al. 2023

Minerals

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“…In the eastern region of the South China Block (SCB), tectonic magmatism spanned a considerable time span during the Mesozoic (Zhou et al, 2006). Notably, the absence of high-pressure blueschist, which is typically associated with subduction, has generated intense debate surrounding the accurate timing of initial subduction and variations in slab dip, with proposals ranging from flat-slab subduction to shallow and steep subduction (Suo et al, 2019;Xu, 2023;Su, 2023). Some researchers proposed a model involving early Permian flat-slab subduction and Jurassic foundering model in the SCB; however, this model lacks substantial evidence of early-stage subduction-related magma (Li and Li, 2007).…”

Section: Introductionmentioning

confidence: 99%

Driven magmatism and crustal thinning of coastal South China in response to subduction

Su,

Zhu,

2024

Preprint

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Abstract. The late Mesozoic igneous rocks along the coastal South China Block (SCB) exhibit complex parental sources involving a depleted mantle, subducted sediment-derived melt, and melted crust. This period aligns with the magmatic flareup and lull in the SCB, debating with the compression or extension in coastal region. Our study employs numerical models to investigate the dynamics of the ascent of underplating magma along the Changle-Nan’ao Belt (CNB), simulating its intrusion and cooling processes while disregarding the formational background. The rheological structure of the lithospheric mantle significantly influences magma pathways, dictating the distribution of magmatism. This work reveals that the ascent of magma in the presence of faults is considerably faster than that in the absence of faults, and contemporaneous magmatic melts could produce different cooling and diagenetic processes. Additionally, the influence of pre-existing magma accelerates underplating magma emplacement. The ascending of magma forms a mush-like head, contributing to magmatic circulation beneath the crust and decreasing crustal thickness. Multiphase magmatism increases the geothermal gradient, reducing the lithospheric viscosity and promoting underplating magma ascent, leading to magmatic flare-ups and lulls. Our findings suggest that the Cretaceous magmatism at different times in the coastal SCB may be associated with the effects of lithospheric faults under similar subduction conditions. Boundary compression forces delay magma ascent, while rising magma induces a significant circulation, decreasing the crustal thickness of the coastal SCB. This study provides new insights into the complex interplay of magmatic processes during subduction, emphasizing the role of lithospheric structure in shaping the temporal and spatial evolution of coastal magmatism.

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“…SE China is an essential distribution area for medium and low temperature geothermal resources in the Chinese mainland. SE China is located in the southeastern margin of the Eurasian Plate and is an important part of the tectonomagmatic belt along the Pacific tectonic domain (Li and Li, 2007;Li S Z et al, 2019;Xu, 2023). The subduction of the Paleo-Pacific Plate since the Mesozoic and Cenozoic has caused a series of widely-distributed tectonomagmatic activities, which provided the appropriate geological conditions for the formation of numerous hydrothermal systems (Sun et al, 2020;Zhou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Systems Characterized by Crustal Thermally‐dominated Structures of Southeastern China

Wang

Gan

Lin

et al. 2023

Acta Geologica Sinica (Eng)

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Southeastern China (SE China) is located in the Pacific tectonic domain and has experienced a series of tectono–magmatic activities induced by the subduction of the Paleo–Pacific Plate since the late Mesozoic. The subduction formed a series of NE‐NNE oriented faults under the NW‐SE regional stress field, along which a number of thermal springs occur. Previous studies have focused on the genesis mechanism of specific geothermal field in SE China, but the generality characteristic of hydrothermal systems in SE China remains unclear. In this paper, we investigate the correlation between geothermal activity, hydrochemical type, and regional faults by studying the distribution of hydrothermal activity and geochemical properties of typical hydrothermal systems in SE China. The hydrothermal systems in SE China have the crustal thermal–dominated structures genesis unique to the specific geological and tectonic conditions of the Eurasian Plate margin. The upwelling of the asthenosphere and the widespread granitoids with high radiogenic heat production in SE China provide major heat sources for the regional geothermal anomalies. The NE–oriented crustal thermal–dominant faults are critical for the formation of geothermal anomalies. and NW–oriented extensional faults have created favorable conditions for meteoric water infiltration, transport and form thermal springs.

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Late Triassic to Middle Jurassic tectonic evolution of the South China Block: Geodynamic transition from the Paleo-Tethys to the Paleo-Pacific regimes

Cited by 11 publications

References 169 publications

Deeply Derived Magma Controlling the Polymetallic Mineralization at Shuikoushan, South China: Constraints from Mineral U–Pb Dating and Whole-Rock Geochemistry

Deeply Derived Magma Controlling the Polymetallic Mineralization at Shuikoushan, South China: Constraints from Mineral U–Pb Dating and Whole-Rock Geochemistry

Driven magmatism and crustal thinning of coastal South China in response to subduction

Hydrothermal Systems Characterized by Crustal Thermally‐dominated Structures of Southeastern China

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