Lithospheric structure in the Cathaysia block (South China) and its implication for the Late Mesozoic magmatism

Deng, Yangfan; Li, Jiangtao; Peng, Touping; Ma, Qiang; Song, Xiaodong; Sun, Xin; Shen, Ying; Wu, Fan

doi:10.1016/j.pepi.2019.04.003

Cited by 48 publications

(30 citation statements)

References 70 publications

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“…Moreover, the modeling results, temperature and pressure estimates, and bulk rock composition are similar to the genesis of leucogranites that are derived by decompressional melting after the collapse of thickened crust (Sylvester, 1998;Castro et al, 2000;Clemens, 2003;Collins and Richards, 2008). Such a scenario is sufficient to induce melting at lower pressure and is applicable to the rocks of Taipa and Coloane as there is little evidence (e.g., mafic dykes) that indicates a high thermal regime occurred during the Oxfordian (Castro et al, 2000;Li et al, 2004Li et al, , 2007aDeng et al, 2019).…”

Section: Implications For the Early Yanshanian Orogenysupporting

confidence: 58%

Late Jurassic Leucogranites of Macau (SE China): A Record of Crustal Recycling During the Early Yanshanian Orogeny

Shellnutt¹,

Vaughan²,

Lee

et al. 2020

Front. Earth Sci.

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The Yanshanian Orogeny consists of Jurassic to Cretaceous compressional-extensional cycles related to the subduction of the Paleo-Pacific Ocean beneath East Asia. Numerous granitic plutons were emplaced across southeast China at distinct intervals over a period of ∼100 million years that migrate from the interior to the coast. A key region to help constrain the secular evolution of granitic magmatism related to the Yanshanian Orogeny is the Peal River estuary as three distinct Mesozoic magmatic belts congregate. The islands of Taipa and Coloane, Macau Special Administrative Region, are located along the western bank of the Pearl River estuary and are composed of spessartine-bearing biotite leucogranite. In situ zircon geochronology yielded Late Jurassic weighted-mean 206 Pb/ 238 U ages of 160.0 ± 2.0 and 161.5 ± 2.0 Ma that correlate to the late Early Yanshanian Orogeny. Inherited zircons of Middle Triassic to Middle Jurassic age were also identified. The rocks are peraluminous, ferroan, calc-alkalic to calcic and classify as post-collisional granite. Geochemical modeling indicates that the chemical variability of the rocks is related to hydrous fractional crystallization under reducing conditions (FMQ −1) at ∼7 km depth. The Sr-Nd isotopes [I Sr = 0.71156 to 0.72477; ε Nd (t) = −7.9 to-8.6], zircon Hf isotopes [ε Hf (t) = −3.8 to −8.8], incompatible trace element ratios, and whole rock composition indicate that the parental magma was derived primarily from a sedimentary source. It is likely that the islands of Taipa and Coloane form a coherent plutonic complex that may be a member of larger batholith that extends across the Pearl River estuary to Hong Kong. The emplacement of the leucogranites is attributed to decompressional melting associated with a period of crustal relaxation or tensional plate stress that occurred during the transition from low angle subduction to high angle subduction of the Paleo-Pacific plate.

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Section: Implications For the Early Yanshanian Orogenysupporting

confidence: 58%

Late Jurassic Leucogranites of Macau (SE China): A Record of Crustal Recycling During the Early Yanshanian Orogeny

Shellnutt¹,

Vaughan²,

Lee

et al. 2020

Front. Earth Sci.

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“…The thrust fault detected by the MT EF indicates that the destruction of the superficial stratum can only occur when the subterranean rigid granite body is sliced. Furthermore, some geological features, includes the Cenozoic activities are dominated by large‐scale nearly straight strike‐slip faults (Suo et al, 2014), subterranean granite with a length of nearly 300 km in Guangdong Province connects into a whole (Deng et al, 2019), and the emplacement of massive granitic magma in South China, seems to support the pattern in which rigid subterranean granite protects the overlying crust could extend to the whole of South China. Nevertheless, these speculations need further investigation to define.…”

Section: Discussionmentioning

confidence: 91%

Cenozoic tectonic evolution of South China: A brief review, and new insights from the Huangshadong‐Shiba area, south‐east China

Kuang

Wang

et al. 2020

Geological Journal

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The Cenozoic tectonic dynamic process controlled by the Pacific subduction and Tethyan subduction/collision in South China are still controversial and lacks geological evidence of intracontinental deformation to define. Here, we focused on the Huangshadong-Shiba area (HSA) in the southeastern coastal area of China. This study aims to obtain multi-stage geological events by an integrated multidisciplinary investigation to decipher the multiple tectonic deformation in Cenozoic South China. We found that the Jurassic and Cretaceous granite not only dominates in surface magmatic rocks but also integrates into a whole with buried depth more than 2 km. This plate-like granite (it means the occurrence of granite is like a tremendous plate) with thickness more than 3 km is sliced by Heyuan Fault, Renzishi Fault, and Zijin-Boluo Fault. The basalts in the Shiba Basin have an Ocean Island Basalt-like property, and the Heyuan Fault controlled the distribution of basalt. Our results, merged with a review of the Cenozoic tectonic evolution in South China, emphasise the decisive role of the India-Eurasia collision on the tectonics of South China in the Palaeogene and suggest the continuous northward drift of the Philippine Sea Plate and Australian Plate had a substantial effect on South China in the Neogene. This study also proposes a two-stage tectonic activity model to visualise the Cenozoic tectonic activity acting on the HSA or South China.

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“…The lithospheric extension and thinning provide the heat and pressure conditions for melting the lower crust and thus forming the widespread granitoids in South China (Y. Deng et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation

Deng

Byrnes

Bezada

2021

Geophysical Research Letters

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The long tectonic history of South China includes Precambrian amalgamation and several Phanerozoic episodes of lithospheric modification. It formed via the collision of the Yangtze and Cathaysia blocks (Figure 1a) along the Jiangshan-Shaoxing fault in the Neoproterozoic (e.g. Z. X. Li et al., 2002). After amalgamation, three important tectonothermal events occurred in South China, namely the Wuyi-Yunkai (Early Paleozoic), Indosinian (Triassic), and Yanshanian (Jurassic-Cretaceous) events (Y. Wang et al., 2013b), often called "movements" in Chinese literature. Each event led to extensive deformation and magmatism across South China. The lingering effects of these events on lithospheric structure have been investigated by many geophysical studies, including models of P wave velocity structure from active seismic profiles (Y.

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Lithospheric structure in the Cathaysia block (South China) and its implication for the Late Mesozoic magmatism

Cited by 48 publications

References 70 publications

Late Jurassic Leucogranites of Macau (SE China): A Record of Crustal Recycling During the Early Yanshanian Orogeny

Late Jurassic Leucogranites of Macau (SE China): A Record of Crustal Recycling During the Early Yanshanian Orogeny

Cenozoic tectonic evolution of South China: A brief review, and new insights from the Huangshadong‐Shiba area, south‐east China

New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation

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