Intraplate extension of the Indochina plate deduced from 26 to 24 Ma A-type granites and tectonic implications

Wang, Xinyu; Yao, Xia; Wang, Shifeng; Zhu, Xinyou; Wang, Jingbin; Wang, Chao

doi:10.1080/00206814.2018.1531356

Cited by 4 publications

(3 citation statements)

References 77 publications

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“…Petrological and geochemical results indicate that the lithospheric mantle was delaminated in the Eocene to early Oligocene (Chen et al, ; Chung et al, ; Lu et al, ; Wang et al, ). Previous studies found highly potassic late Paleogene (ca.…”

Section: Discussionmentioning

confidence: 99%

“…27–22 Ma) magmas with high Mg# (60–68) in Yunnan and northwestern Vietnam (Chen et al, ; Chung et al, ; Wang et al, ), which are generally produced in a dilatational setting. Thus, the lower parts of lithospheric mantle were probably delaminated in northern Indochina circa 40–30 Ma, followed by asthenospheric intrusion and emplacements of lithospheric mantle‐derived potassic magmas (Chen et al, ; Chung et al, ; Wang et al, ). Lu et al () analyzed geochemical, Sr‐Nd‐Pb isotope and zircon Hf‐O isotope signatures and concluded that the shoshonitic and potassic adakite‐like suites in western Yunnan are associated with removal of the lower lithospheric mantle and the subsequent asthenospheric upwelling.…”

Section: Discussionmentioning

confidence: 99%

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P and S Wave Tomography Beneath the SE Tibetan Plateau: Evidence for Lithospheric Delamination

Huang

Wang

et al. 2019

JGR Solid Earth

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The SE Tibetan Plateau is located between the eastern Himalayan syntaxis and the stable Yangtze craton; its tectonic evolution is important for understanding the plateau expansion. However, interactions between the plateau and its adjacent subduction zone and craton are still unclear. In this study, we determine updated high-resolution P and S wave tomographic models of the crust and upper mantle beneath the SE Tibetan Plateau. We confirmed the existence of a high-velocity layer in the upper mantle down to 200-km depth beneath the Sichuan basin, the core of the Yangtze craton, representing the stable cratonic root. Another high-velocity body is located beneath Burma, reflecting the subducting Indian slab in the upper mantle and possibly the remnant Burman slab in the mantle transition zone. A strong low-velocity column exists above the high-velocity body in the transition zone and reaches the Moho under the Tengchong volcano. In addition, we find high-velocity fragments in the upper mantle beneath the Yangtze craton and northern Indochina, which may reflect delaminated lithosphere beneath the SE Tibetan Plateau. The lithospheric delamination may be closely related to mantle flow extruded from the high plateau and possible thermal upwelling from the lower mantle. Our results provide new insight into the deep interactions between the Tibetan plateau and its surrounding blocks near the SE plateau margin.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

P and S Wave Tomography Beneath the SE Tibetan Plateau: Evidence for Lithospheric Delamination

Huang

Wang

et al. 2019

JGR Solid Earth

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“…The regional mantle-wedge flow may be responsible for the E-W mineral fabrics and anisotropy in the upper mantle [Huang et al, 2015b;Kong et al, 2018]. Geophysical and geochemistry results also suggest lithospheric delamination and asthenospheric upwelling in northern Indochina [Chung et al, 1997;Lu et al, 2013;Chen et al, 2017;Wang et al, 2018].…”

Section: Asthenospheric Extrusion/flowmentioning

confidence: 93%

Mantle dynamics in the SE Tibetan Plateau revealed by teleseismic shear-wave splitting analysis

Huang

Chevrot

2021

Physics of the Earth and Planetary Interiors

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Rejuvenation of the lithospheric mantle beneath the orogens: Constraints from elemental geochemistry and Os isotopes in mantle xenoliths

Zhou

Pearson

et al. 2023

Geochimica et Cosmochimica Acta

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Intraplate extension of the Indochina plate deduced from 26 to 24 Ma A-type granites and tectonic implications

Cited by 4 publications

References 77 publications

P and S Wave Tomography Beneath the SE Tibetan Plateau: Evidence for Lithospheric Delamination

P and S Wave Tomography Beneath the SE Tibetan Plateau: Evidence for Lithospheric Delamination

Mantle dynamics in the SE Tibetan Plateau revealed by teleseismic shear-wave splitting analysis

Rejuvenation of the lithospheric mantle beneath the orogens: Constraints from elemental geochemistry and Os isotopes in mantle xenoliths

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