A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity

Xia, Yan; Xu, Xisheng

doi:10.1029/2018gl081882

Cited by 27 publications

(6 citation statements)

References 158 publications

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“…The Cathaysia Block is situated in southeastern South China and is bounded by the Jiang–Shao fault with the rest of South China (Figure 1). Early Precambrian lithologies have been discovered from different localities of this continental block (Shen et al., 2016; Xia & Xu, 2019; A. Zhang et al., 2021; L. Zhao et al., 2015b). Metamorphism and related magmatism in the Paleozoic (also known as the South China Caledonian, 460–410 Ma), the Permo–Triassic (Indosinian), and the Late Mesozoic (Yanshanian) are extensively developed in the Cathaysia Block, and the metamorphic rocks occur in different metamorphic belts (Figure 1, J. Li et al., 2014, 2017a, 2022; S. Lin et al., 2018; Y. Wang et al., 2013; Xing et al., 2010; L. Zhao et al., 2017).…”

Section: Geological Background and Samplesmentioning

confidence: 99%

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The Joining of North and South China During the Permian: Coherent Metamorphic Evidence From East Asia Orogenesis

Zhao,

Tang,

Mitchell

et al. 2023

Tectonics

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The joining of the North and South China blocks marks the formation of the united East Asian continent, which is an integral part of Pangea. The amalgamation of these two continental blocks also resulted in the formation of the world‐class ultrahigh pressure orogenic belt, namely the Dabie–Sulu orogenic belt. Figuring out the time of the initial collision between the two continents is critical for resolving questions such as the duration and the geodynamic processes of the orogeny. A Triassic joining time has been suggested by the geochronology of the eclogite facies rocks in this orogenic belt. However, paleomagnetic and paleontological studies suggested a Permian docking time for these continental blocks. In this paper, we present new metamorphic ages of rocks from northern Dabie and the Permo–Triassic intracontinental orogen of South China, which are all closely associated with this continental collisional event. New age dating results, as well as a synthesis of recent studies on metamorphic rocks occurring in southeastern North China and the Cathaysia Block of South China, show that the onset of the collisional orogenesis along the eastern part of the orogenic belt dates back to the Middle Permian (270–252 Ma). Considering these data and other geological records, we provide a new tectonic model for the major continents of East Asia, in which we show that the initial collision between North and South China occurred in the east during the Middle Permian, and then propagated westward. Continental collisions forming mountains and closing seaways in East Asia thus apparently occurred before the end‐Permian mass extinction, suggesting these paleogeographic changes might have also preconditioned and facilitated the end‐Permian biospheric crisis in the region.

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Section: Geological Background and Samplesmentioning

confidence: 99%

“…Modified after L. Zhao et al (2015bZhao et al ( , 2022. continental block (Shen et al, 2016;Xia & Xu, 2019;L. Zhao et al, 2015b).…”

Section: Geological Background and Samplesmentioning

confidence: 99%

The Joining of North and South China During the Permian: Coherent Metamorphic Evidence From East Asia Orogenesis

Zhao,

Tang,

Mitchell

et al. 2023

Tectonics

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“…The underlying sequences are dominated by flysch-like successions of sandstone, siltstone, slate, and phyllite deposited at 860-825Ma, including the Shuangqiaoshan Group in the northern Jiangxi and equivalents in other provinces [41,46]). The overlying sequence consists of slightly metamorphosed supracrustal rocks deposited in the Nanhua rift (e.g., the Banxi Group and equivalents [47]). The Cathaysia block comprises the Paleoproterozoic Badu Complex and Wuyishan granites as the basement, overlain by early Neoproterozoic volcanic successions (1000-900 Ma [48,49].…”

Section: Neoproterozoic Geologymentioning

confidence: 99%

“…The Cathaysia block comprises the Paleoproterozoic Badu Complex and Wuyishan granites as the basement, overlain by early Neoproterozoic volcanic successions (1000-900 Ma [48,49]. These rock associations have been interpreted as products of slab subduction [34,41,42,47,50,51].…”

Section: Neoproterozoic Geologymentioning

confidence: 99%

Vein Formation and Reopening in a Cooling Yet Intermittently Pressurized Hydrothermal System: The Single-Intrusion Tongchang Porphyry Cu Deposit

Richard

Pironon

et al. 2023

Geosciences

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Porphyry deposits are the dominant sources of copper and major sources of several base and precious metals. They are commonly formed via the repeated emplacement of hydrous magmas and associated fluid exsolution. As a result, mineralized hydrothermal veins may undergo multiple deposition and reopening processes that are not fully accounted for by existing fluid models. The Tongchang porphyry Cu deposit is a rare example of being related to a single intrusion. The simplicity in intrusive history provides an ideal starting point for studying fluid processes in more complex multi-intrusion porphyry systems. Detailed scanning electron microscope (SEM) cathodoluminescence imaging (CL) revealed rich microtextures in quartz and anhydrite that point to a fluid timeline encompassing early quartz deposition followed by fluid-aided dynamic recrystallization, which was succeeded by an intermediate stage of quartz dissolution and subsequent deposition, and ended with a late stage of continuous quartz deposition, brecciation, and fracturing. Vein reopening is more common than expected. Fifteen out of seventeen examined vein samples contained quartz and/or anhydrite that was older or younger than the vein age defined by vein sequences. Thermobarometry and solubility analysis suggests that the fluid events occurred in a general cooling path (from 650 °C to 250 °C), interspersed with two episodes of fluid pressurization. The first episode occurred at high-T (>500 °C), under lithostatic conditions alongside dynamic recrystallization, whereas the second one took place at a lower temperature (~400 °C), under lithostatic to hydrostatic transition conditions. The main episode of chalcopyrite veining took place subsequent to the second overpressure episode at temperatures of 380–300 °C. The results of this study reaffirm that thermal and hydraulic conditions are the main causative factors for vein reopening and growth in porphyry deposits.

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“…2). Early Precambrian lithologies have been discovered from different localities of this continental block (Shen et al, 2016;Xia and Xu, 2019;Zhang et al, 2021a;Zhao et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

East Asia orogenesis restricted oceanic circulation between Paleo-Tethys and Panthalassa before the Permian mass extinction

Zhao

Mitchell

et al. 2022

Preprint

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The Paleo-Tethys and Panthalassa are two major oceans that witnessed the end-Permian mass extinction, and they have been suggested to have distinct compositions, with the Paleo-Tethys Ocean euxinic, and the much larger Panthalassa Ocean being largely ventilated. Distinctions of these two once-connected oceans imply that interactions between them must have been restricted shortly before the end-Permian extinction. However, detailed geological processes for the disconnection between them along the eastern Paleo-Tethys Ocean due to the collision of North and South China, are still unclear. Previous geochronological studies on eclogite facies rocks in the Dabie–Sulu orogenic belt, which are the metamorphic products of the collision between North and South China, have yielded mainly Triassic metamorphic ages. Nonetheless, new Permian metamorphic ages are identified from southeastern North China, northern Dabie, and the Permo–Triassic intracontinental orogen of South China, which may collectively closely associate this major tectonic event with the end-Permian extinction. New age dating results, as well as a synthesis of recent studies on metamorphic rocks, show that the onset of the collisional orogenesis dates back to the Middle Permian (270–252 Ma). We thereby provide a new tectonic model for the major continents of East Asia, in which the initial collision between North and South China during the Middle Permian critically isolated the Paleo-Tethys Ocean from the Panthalassa Ocean, facilitating the oceanographic transition of the once fossiliferous Paleo-Tethys from a life-giving nutrient-rich ocean into a euxinic death trap, thereby serving as prelude to the end-Permian extinction.

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A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity

Cited by 27 publications

References 158 publications

The Joining of North and South China During the Permian: Coherent Metamorphic Evidence From East Asia Orogenesis

The Joining of North and South China During the Permian: Coherent Metamorphic Evidence From East Asia Orogenesis

Vein Formation and Reopening in a Cooling Yet Intermittently Pressurized Hydrothermal System: The Single-Intrusion Tongchang Porphyry Cu Deposit

East Asia orogenesis restricted oceanic circulation between Paleo-Tethys and Panthalassa before the Permian mass extinction

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