Petrogenesis of Eocene mineralized porphyry in Bijiashan, eastern margin of Tibet Plateau: Constraints from geochronology, geochemistry and Hf isotopes

Zhou, Jie; Li, Sanzhong; Wang, Genhou; Santosh, M.; Li, Zhang; Yu, Shengyao; Liu, Yiming; Li, Xiyao

doi:10.1016/j.lithos.2018.06.012

Cited by 2 publications

(3 citation statements)

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“…Seismic tomography of the mantle infers the occurrence of slab tearing, characterized by sub‐vertical ruptures within the subducting slab, in the EHS regions (Raoof et al., 2016). This phenomenon is often associated with distinctive magmatic signatures, including potassic igneous suites exhibiting compositions ranging from mafic to felsic end‐members (Figure 13a) (Hou et al., 2004; Lu et al., 2012; X. Wang et al., 2001; Y. Xu et al., 2008; J. Zhou et al., 2018; Y. Zhou et al., 2018), faulting (Figures 13b and 13c) (Bian et al., 2022), and block rotation (Figure 13d) (Jolivet et al., 2015; S. Li et al., 2017). Numerical model simulations indicate that a laterally unconfined slab with tears in the subducting lithosphere can induce toroidal flow fields in the mantle (Moresi et al., 2014; Petrescu et al., 2023; Piromallo et al., 2006).…”

Section: Discussion and Interpretationmentioning

confidence: 99%

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Slab Tear of Subducted Indian Lithosphere Beneath the Eastern Himalayan Syntaxis Region

Li,

Zhang,

Guo

et al. 2024

Tectonics

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In the southeastern Tibetan Plateau, region‐scale dextral strike‐slip shear zones, crucial for India‐Asia convergence, were investigated along the Dulongjiang shear zone near the Eastern Himalayan Syntaxis (EHS). Structural, kinematic, and geochronological data from Dulongjiang and Nabang regions in western Yunnan, China, reveal dextral strike‐slip shearing between 30 and 15 Ma. Various rocks were affected by moderate‐temperature shear deformation (∼450–550°C), inferred from microstructures and quartz CPO patterns, during dextral strike‐slip and exhumation of the shear zone. Combined with structures of pre‐, syn‐, and post‐shearing leucogranites, zircon U‐Pb dating indicates that the dextral shear along the shear zone began in the Early Oligocene (30–29 Ma) subsequent to the India‐Asia collision. Micas in mylonitic granites yield 40Ar/39Ar ages, suggesting that the principal dextral shear deformation occurred approximately between 18 and 15 Ma. The Dulongjiang shear zone is linked to the Parlung, Nabang shear zone, and Sagaing Fault, forming a regional Cenozoic dextral shear system around the EHS. The study, combined with tomographic anomalies beneath the India‐Asia collision zone, highlights distinct lithospheric‐scale evolution in southeastern and eastern Tibet. Continuous intracontinental strike‐slip shearing indicates a tectonic shift from Tibetan extension to block rotation around the EHS. From 30 to 15 Ma, slab tear, accompanied by clockwise rotation and dextral strike‐slip shearing, suggests a warmer geodynamic setting influenced by hot mantle flow associated with ongoing subduction of the Indian lithosphere. Oligocene‐Miocene dextral strike‐slip shearing around the EHS, linking southwards with the Sagaing Fault, may correspond to the rotation necessary for slab to bend, stretch, and eventually tear beneath the region.

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Section: Discussion and Interpretationmentioning

confidence: 99%

“…Wang et al, 2001;Y. Xu et al, 2008;J. Zhou et al, 2018;, faulting (Figures 13b and 13c) (Bian et al, 2022), and block rotation (Figure 13d) (Jolivet et al, 2015;S.…”

Section: Tectonic Implicationmentioning

confidence: 96%

Slab Tear of Subducted Indian Lithosphere Beneath the Eastern Himalayan Syntaxis Region

Li,

Zhang,

Guo

et al. 2024

Tectonics

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“…These data demonstrated that each potassic-ultrapotassic body in SE Tibet appears to be unique, and no single petrogenetic model can be universally applied to them. The lack of understanding about the potassic rocks in SE Tibet is manifested in several contrasting petrogenetic models presented in previous studies (e.g., Zhang and Schä rer, 1999;Liang et al, 2007;Lu et al, 2013aLu et al, , 2015Zhou et al, 2018;Wang and Zhang, 2021).…”

Section: Introductionmentioning

confidence: 96%

Petrogenesis of the Late Eocene to Early Oligocene Yao'an Shoshonitic Complex, Southeastern Tibet: Partial Melting of an Ancient Continental Lithospheric Mantle beneath the Yangtze Block

Dong

Yang

Xue

et al. 2023

Acta Geologica Sinica (Eng)

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Cenozoic potassic‐ultrapotassic igneous rocks are widespread in the southeastern Tibetan Plateau. Their petrogenesis and magmatic process remain subject to debate in spite of numerous publications. Almost all of the Cenozoic extrusive and intrusive rocks in Yao'an area, western Yunnan Province, China are geochemically shoshonitic. We collectively term them the Yao'an Shoshonite Complex (YSC). The YSC is located in the (south)easternmost part of the ENE—WSW‐trending, ∼500‐km‐long and ∼250‐km‐wide Cenozoic magmatic zone, which separates the orthogonal and oblique collision belts of the India–Eurasia collision orogen. Previously published geochronological and thermochronological data revealed that the rocks of YSC were emplaced over a short period of 34–32 Ma. Previously published data and our new data suggest that primary magma of the YSC likely were formed by partial melting of an ancient continental lithospheric mantle beneath the Yangtze block. This part of continental lithospheric mantle likely has not been modified by any oceanic subduction. Fractionation crystallization of a Mg‐ and Ca‐bearing mineral and Ti‐Fe oxides during the magmatic evolution probably account for variable lithologies of the YSC.

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Petrogenesis of Eocene mineralized porphyry in Bijiashan, eastern margin of Tibet Plateau: Constraints from geochronology, geochemistry and Hf isotopes

Cited by 2 publications

References 52 publications

Slab Tear of Subducted Indian Lithosphere Beneath the Eastern Himalayan Syntaxis Region

Slab Tear of Subducted Indian Lithosphere Beneath the Eastern Himalayan Syntaxis Region

Petrogenesis of the Late Eocene to Early Oligocene Yao'an Shoshonitic Complex, Southeastern Tibet: Partial Melting of an Ancient Continental Lithospheric Mantle beneath the Yangtze Block

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