Discovery of Vestige Sedimentary Archives of the India‐Asia Collision in the Eastern Yarlung Zangbo Suture Zone

Wei, Zhen; Li, Xianghui; Li, Yongxiang; Fan, Xiaolong; Wang, Jingyu; Zhang, Chaokai; Jiebu, Gongjue

doi:10.1029/2019jb018192

Cited by 8 publications

(10 citation statements)

References 146 publications

(295 reference statements)

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“…Recently, scientists have studied the timing of initial India-Asia collision from the perspectives of biostratigraphic constraints and sedimentary records (DeCelles et al, 2014;Wu et al, 2014;Hu et al, 2015Hu et al, , 2016aQasim et al, 2018;Wei et al, 2020). For instance, DeCelles et al (2014) and Wu et al (2014) confirmed that the first arrival of Asia-derived sediments deposited on the northern Indian continental margin occurred at ~60 Ma in both the Sangdanlin and Gyangze foreland basins, which are located close to the IYZSZ.…”

Section: Implications To Timing Of Initial India-asia Collisionmentioning

confidence: 99%

New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)

Ding

Laskowski

et al. 2022

Front. Earth Sci.

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New zircon U-Pb dating results from the Zonggei Formation volcanics indicate that the volcanic rocks formed at ∼114–110 Ma. Paleomagnetic data, petrography, and rock magnetism confirm the primary nature of isolated characteristic remanent magnetizations carried by titanomagnetite and hematite. A statistical analysis of the combined results from the Zonggei and Duoni formations reveals a group-mean direction of D±ΔD = 0.4° ± 6.0°, I±ΔI = 22.2° ± 5.6°, α95 = 5.6°, k = 35.2 after bedding correction based on 20 group-mean directions. The corresponding paleopole was calculated to be λp = 70.3°N, φp = 270.5°E with A95 = 5.2°. The interpretation of our data alongside the Cenozoic data from the Tethyan Himalaya indicates that the India–Asia collision initiated by 61.7 ± 3.0 Ma at 13.0° ± 1.8°N, assuming a single-collision model. Intracontinental crustal shortening totaling 1,770 ± 470 km took place on the Asian side since the onset of India–Asia collision. Furthermore, the data show that the Neo-Tethys Ocean reached its maximum N-S width of 7,100 ± 530 km at ∼132 Ma and shrank to 6,400 ± 550 km by ∼115 ± 5 Ma. This is consistent with previous estimates based on the geophysical images of the subducted Neo-Tethyan slab beneath Eurasia.

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Section: Implications To Timing Of Initial India-asia Collisionmentioning

confidence: 99%

New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)

Ding

Laskowski

et al. 2022

Front. Earth Sci.

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“…In terms of Y and Ho, both modern seawater and marine carbonates have much higher Y/Ho ratios (elemental Y/Ho 40-90) than chondrite, showing a significant positive Y anomaly in the PAAS-normalised REE + Y patterns. Therefore, the ratio is the key discriminator to differentiate marine hydrogenic rocks from the others (Wei et al, 2020). Additionally, due to the higher surface and solution complexation stabilities of La, Gd and Lu than neighbouring elements, these elements always show positive peaks in marine deposits (Bau, 1999;Allwood et al, 2010).…”

Section: Geochemical Characteristics Of Different Chertsmentioning

confidence: 99%

“…In the open-ocean environments with few terrestrial inputs, Ce shows a significant depletion (Murray, 1994;Murray et al, 1991Murray et al, , 1992Shimizu & Masuda, 1977). Consequently, positive loadings for Rb, La, Y, Lu, Th and U of marine cherts are indicative of the enrichment in the seawater-derived silica (Allwood et al, 2010;Wei et al, 2020); and the negative loadings for Nb and Ce may be caused by the depletion of the elements in the seawater-derived silica (Murray, 1994). Therefore, the geochemical information extracted by SMR regression coefficients and LDA biplot rays agrees well with previous geochemical studies.…”

Section: Geochemical Characteristics Of Different Chertsmentioning

confidence: 99%

Discriminating chert origins using machine‐learning approaches

Wei

Sun

et al. 2023

Geological Journal

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Automatic techniques have not been applied in the geochemical discrimination of marine, terrestrial and hydrothermal cherts, which is critical to retrieving the paleoenvironmental information of ancient sedimentary basins. Here, we applied three supervised machine‐learning methods to analyse the labelled geochemical compositional data (32 major and trace elements) of cherts, including the support vector machine (SVM), sparse multinomial regression and linear discrimination analysis. Our results show that these machine‐learning methods can successfully discriminate different chert types, as the lowest classification score is 79%. Among the methods, the SVM is the most powerful approach (classification score 88%, on average), even though it is hard to be geochemically interpreted. Sparse multinomial regression and linear discrimination analysis are also efficient approaches (mean classification score 84%), which can be used to extract the important elements and the most representative sample for each chert type. Especially, the linear discrimination analysis can construct binary discrimination diagram superposed with biplot rays and posterior probability‐based decision boundaries, which could be quickly applied and explained by other researchers. Furthermore, the successful discrimination of different chert types indicates that cherts derived from different silica sources have different geochemical signatures, albeit mixing between different sources of silica during chert formation is common. Last, the general geochemical features of each chert type were summarised based on geochemical information extracted by machine‐learning methods and previous geochemical studies.

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“…Notably, a hot debate continued concerning tectonic evolution of the northern Tethyan Himalaya. For example, the timing of compressional deformation was inferred to be Early Cretaceous (Zhang et al., 2022) or early Cenozoic (Tang et al., 2022; Wei et al., 2020 and references therein). Thus, the shortening of the flysch may reflect tectonics of either Cretaceous oceanic subduction or the India‐Asia collision.…”

Section: Introductionmentioning

confidence: 99%

Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia

Tang,

Liang,

Wang

et al. 2024

Tectonics

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The poor understanding of the structural history of the Late Triassic flysch in the northeastern Tethyan Himalaya has caused many disputes regarding India‐Asia collisional tectonics. Here, we conducted an integrated study including tectonostratigraphic analysis, structural analysis, and zircon U‒Pb and muscovite 40Ar/39Ar dating to unravel the structural evolution of the Late Triassic flysch. Field geological mapping revealed that the flysch can be subdivided into three structural units, including the Gyaca mélange, Qiongjie‐Dengmu shear zone and Langjiexue fold‐thrust belt. The three units all contain voluminous siliciclastic rocks deposited in an abyssal submarine fan environment at the Indian passive continental margin. The Gyaca mélange shows a two‐stage deformation process that generated a collisional mélange resulting from the subduction of the Indian passive continental margin. 40Ar/39Ar dating of top‐to‐the‐south shear bands and block‐in‐matrix structure indicate that the India‐Asia collision happened no later than the Selandian (ca. 60 Ma). The divergent imbricated thrusting and folding of the Gyaca mélange and Langjiexue fold‐thrust belt formed a positive flower structure. The zircon U‒Pb and 40Ar/39Ar dating of syntectonic dikes and sericite flakes within the Gyaca mélange yield ages of ca. 56–55 Ma for the genesis of the divergent structures. Moreover, the Qiongjie‐Dengmu dextral shear zone yields a sericite 40Ar/39Ar age of ca. 35 Ma and thus indicates a transient strike‐slip stress regime. Generally, the early India‐Asia collision tectonics in the northeastern Tethyan Himalaya showed episodic evolution with changing structural styles from mélange formation to imbricate fold‐thrust belt development and finally strike‐slip shear generation.

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Discovery of Vestige Sedimentary Archives of the India‐Asia Collision in the Eastern Yarlung Zangbo Suture Zone

Cited by 8 publications

References 146 publications

New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)

New Paleomagnetic Constraints on the Early Cretaceous Paleolatitude of the Lhasa Terrane (Tibet)

Discriminating chert origins using machine‐learning approaches

Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia

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