Middle Jurassic collision of an exotic microcontinental fragment: Implications for magmatism across the Southeast China continental margin

Sewell, R. J.; Carter, Andrew; Rittner, Martin

doi:10.1016/j.gr.2016.01.005

Cited by 13 publications

(2 citation statements)

References 46 publications

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“…What is the dynamic background of the low velocity anomaly formation? Previous researchers have proposed many dynamic models (Liu et al, 2013), including the following: (1) Paleo-Pacific Plate flat-slab subduction model (Zhou and Li, 2000;Wu et al, 2003;Li and Li, 2007;Xia et al, 2015;Sewell et al, 2016). In this model, the asthenosphere material upwelling was caused by flat-slab subduction, foundering and roll-back of the Paleo-Pacific Plate; (2) Multiplate interaction model (Liu et al, 2004;Zhou et al, 2006;Dong et al, 2007;Chen et al, 2008;Li et al, 2011;Zheng et al, 2012;Mao et al, 2014;Gao et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

P‐wave Velocity Structure of Crustal and Upper Mantle beneath South China and its Tectonic Implications

Zheng

et al. 2022

Acta Geologica Sinica (Eng)

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The 3D P‐wave velocity structure beneath the South China Block was determined by applying arrival times from 269 teleseismic events recorded by 240 seismic stations within the study region. Our tomographic results reveal the deep structural characteristics of major tectonic units and ore concentration areas. There are distinct high velocity anomalies beneath the ancient Yangtze and Cathaysia blocks, with the lithosphere of the Cathaysia Block being thinner than the Yangtze Block; the Jiangnan orogenic belt, located in the combined zone of two blocks, is a high and low velocity anomaly conversion zone; the famous metallogenic belts of Edongnan, the Youjiang Basin and the Cathaysia Block are obviously low velocity areas with different metallogenic mechanisms. The deep ore‐forming material source in the Edongnan metallogenic belt is different from that of the Cathaysia Block. The low velocity anomaly under the Cathaysia Block related to mineralization results from the upwelling of mantle material, caused by the joint action of the Paleo‐Tethys tectonic domain, the Paleo‐Pacific tectonic domain and the Hainan mantle plume migration and erosion, which has been occurring from northeast to southwest since 80 Ma. The low‐temperature mineralization mechanism of Youjiang Basin should be considered not only in terms of the influence of the Emeishan mantle plume in the west and the Paleo‐Tethys tectonic domain in the south, but also in the context of the influence of the upwelling of asthenospheric material from the Paleo‐Pacific tectonic domain in the east.

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Section: Resultsmentioning

confidence: 99%

P‐wave Velocity Structure of Crustal and Upper Mantle beneath South China and its Tectonic Implications

Zheng

et al. 2022

Acta Geologica Sinica (Eng)

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“…During the course of geological movement, microcontinents contribute to terrane gathering and the formation of a larger continent (Li et al, 2018;Zhou, Wilde, Zhao, & Han, 2018), and also affect the process of oceanic subduction (Hegner et al, 2019;Jiang et al, 2014). During oceanic subduction, they can induce (McKenzie, 1977;Stern & Gerya, 2018) or clog the subduction (Robertson & Parlak, 2020), and can change the polarity or position of a subduction zone (Otsuki, 1992;Robertson & Parlak, 2020;Sewell, Carter, & Rittner, 2016). Therefore, microcontinents played a key role in the formation of a modern continent, especially in oceanic subduction.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and geochronology of Pengco subduction‐related ophiolites, Tibet: Implications for Dongkaco microcontinent in the Bangong–Nujiang suture zone

Shao

Song

et al. 2021

Geological Journal

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The identification of a microcontinent in Bangong-Nujiang suture zone (BNSZ) is important to understanding the tectonic evolution of Bangong-Nujiang Tethys Ocean (BNTO). Subduction-related ophiolite is one of the keys to discriminate a microcontinent in suture zones, which can be generated during the oceanic subduction beneath the microcontinent. Generally, ophiolites in the adjacent area of a microcontinent would show characteristics of a volcanic arc, while ophiolites in adjacent area of an ocean show characteristics of a fore-arc. North Pengco ophiolites (NPOs) and South Pengco ophiolites (SPOs) were collected in the central section of BNSZ, and dated at 115.0-111.5 Ma by SHRIMP II. According to their trace element characteristics, NPOs were determined to have formed at a setting of subduction-related volcanic arc and affected by slab-derived fluids or melts. The diagram based on the Ce versus Ce/Y shows that NPOs originated from the partial melting of spinel peridotites. On the other hand, SPOs were generated from the partial melting of ultra-depleted mantle at a setting of subduction-related fore-arc on the basis of extraordinarily low REEs summation and HFSEs (e.g., Zr, Ti, Nb and Ta), relatively high concentrations of compatible elements (e.g., Cr, Ni), large ratios of CaO/TiO 2 (37.67-437.50) and Al 2 O 3 /TiO 2 (20.78-424.50), which were also affected by slab-derived fluids. Based on the relative location of NPOs and SPOs, it reasonably proposed that a northward subduction of a minor oceanic basin had occurred at the Early Cretaceous, trigged by the Dongkaco microcontinent (DMC). In reverse, these ophiolites provide evidence for the existence of DMC in BNTO. Combining with other subduction-related ophiolites developed in BNSZ, BNTO might have comprised of several minor oceanic basins separated by some blocks like DMC in the central and west sections, rather than a unified ocean basin.

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Geochronology, geochemical characteristics, and geological implications of the Guangnan pluton in the Middle Segment of the Zhuguangshan batholith, South China

et al. 2022

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Middle Jurassic collision of an exotic microcontinental fragment: Implications for magmatism across the Southeast China continental margin

Cited by 13 publications

References 46 publications

P‐wave Velocity Structure of Crustal and Upper Mantle beneath South China and its Tectonic Implications

P‐wave Velocity Structure of Crustal and Upper Mantle beneath South China and its Tectonic Implications

Geochemistry and geochronology of Pengco subduction‐related ophiolites, Tibet: Implications for Dongkaco microcontinent in the Bangong–Nujiang suture zone

Geochronology, geochemical characteristics, and geological implications of the Guangnan pluton in the Middle Segment of the Zhuguangshan batholith, South China

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