Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet

Tang, Mao-Yun; Liu‐Zeng, Jing; Hoke, G. D.; Xu, Qiang; Wang, Weitao; Li, Zhanfei; Zhang, Jinyu; Wang, Wei

doi:10.1016/j.tecto.2017.05.018

Cited by 80 publications

(82 citation statements)

References 87 publications

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“…Previous rock magnetic studies (Li et al, 2020;M. Tang et al, 2017;Zhang et al, 2018) have confirmed that most likely detrital hematite is the dominant magnetic mineral in the sedimentary rocks of the Gonjo Basin, with a minor contribution of magnetite in some samples.…”

Section: Geological Setting and Methodsmentioning

confidence: 86%

“…This, together with the presence of growth strata in the eastern part of the basin, has led to the interpretation that the Gonjo Basin was a syncontractional basin (Studnicki-Gizbert et al, 2008). Basin structures, sedimentary facies, and varied paleocurrent directions suggested that the Gonjo Basin was fed by a proximal source (Studnicki-Gizbert et al, 2008;M. Tang et al, 2017).…”

Section: Geological Setting and Methodsmentioning

confidence: 99%

“…Tang et al, 2017). The strata in the Gonjo Basin are dominated by red-colored mudstones, sandstones, and rare conglomerates with a thickness of >3,000 m, reflecting predominantly alluvial fan, fan-delta, floodplain, and lacustrine deposition (Studnicki-Gizbert et al, 2008;M. Tang et al, 2017;Xizang BGMR, 1982).…”

Section: Geological Setting and Methodsmentioning

confidence: 99%

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Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses

Hinsbergen

Shen

et al. 2020

Geophysical Research Letters

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The Tibetan Plateau accommodated major upper crustal shortening during Indian Plate oceanic and continental lithosphere subduction. Deciphering whether shortening was continuous or episodic, and how it correlates to major geodynamic changes is challenging. Here we apply anisotropy of magnetic susceptibility (AMS), a sensitive synsedimentary strain indicator, to a~3 km thick magnetostratigraphically dated sedimentary section (69-41.5 Ma) in eastern Tibet. AMS shows "earliest deformation" fabrics from 69-52 Ma, followed by a sudden change to "pencil structure" fabrics with increasing anisotropy degree at~52 Ma, dating a sudden increased synsedimentary shortening strain. This change coincides with enhanced sedimentation rates and synsedimentary vertical-axis rotations of the Gonjo Basin, suggesting a causal link to a marked India-Asia convergence rate deceleration. We show that AMS analysis provides a strong tool to distinguish between climatic and tectonic causes of sedimentological change and is an asset in identifying discrete tectonic pulses in intensely deformed terrane.Plain Language Summary How the Tibetan Plateau evolved during India-Asia convergence and collision is notoriously challenging to decipher. Use of sedimentary records to date periods of tectonic activity is a popular approach, yet distinguishing between tectonic versus climate signals in sediment records can be challenging. The anisotropy of magnetic susceptibility (AMS) is an effective and sensitive technique that reveals tectonic stress fields during sedimentation and changes therein, even in weakly deformed clastic sedimentary rocks. We report a detailed record of AMS data from a~3 km thick section of redbeds from the Gonjo Basin in eastern Tibet. Previous magnetostratigraphy dated deposition from 69 to 41.5 Ma; during this time period marked sedimentation rate increases and simultaneous vertical-axis rotations were interpreted to reflect shortening pulses. Our new AMS data indicate an increased shortening strain at~52 Ma, demonstrating that the sedimentation rate changes are tectonic rather than climatic in origin, showing that a pulse in crustal shortening of Tibet occurred simultaneous with a marked~52 Ma onset of deceleration of India-Asia convergence. We show that applying a suite of paleomagnetic and rock magnetic techniques, including magnetostratigraphy and sedimentation rate calculation, vertical-axis rotation analysis, and AMS analysis, provides a powerful tool to differentiate tectonic versus climatic influence on a sediment archive, allowing the precise dating of discrete deformation phases in intensely deformed regions that evolved over long periods of time.

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Section: Geological Setting and Methodsmentioning

confidence: 86%

Section: Geological Setting and Methodsmentioning

confidence: 99%

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Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses

Hinsbergen

Shen

et al. 2020

Geophysical Research Letters

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“…The role of topography in modulating the Indo-Asian Monsoon (IAM) circulation has long been studied (Chakraborty et al, 2006;Gill, 1980;Kitoh, 2002;Kutzbach et al, 1989;Manabe & Terpstra, 1974;Privé & Plumb, 2007a, 2007bYanai & Li, 1994). However, parsing out the first-order impact of individual mountain ranges requires consideration of the complex orogenic history of the region (Botsyun et al, 2019;Clift et al, 2008;DeCelles et al, 2007;Molnar et al, 2010;Spicer et al, 2003;Tang et al, 2017;Webb et al, 2017). For example, the uplift of a proto-Tibet during the Early Cenozoic (Mulch & Page Chamberlain, 2006), which lacked the Himalayan Mountains and the mountains west of the region, was hypothesized to enhance the IAM.…”

Section: Introductionmentioning

confidence: 99%

Competing Topographic Mechanisms for the Summer Indo‐Asian Monsoon

Acosta

Huber

2020

Geophysical Research Letters

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The Indo‐Asian Monsoon (IAM) has changed as the topographies of Asia were assembled into their current configuration. Understanding complex interactions between topography and the IAM through time has been hampered, in part, by poorly resolved topography and atmospheric dynamics in climate models. Here, we employ high‐resolution (0.23° × 0.31°) global climate simulations, to more accurately capture these interactions. We find that the Himalayas and Tibet primarily redirect the onshore moisture transport and produce local orographic precipitation. The Iranian Plateau is the primary gatekeeper, insulating the pool of high‐enthalpy air in the Indo‐Gangetic Plain (IGP) from westerly low‐enthalpy advection. But, even when such high‐enthalpy air exists along the IGP, vigorous precipitation in the region (poleward of 25°N) still requires orographic steering and lifting. The large‐scale circulations—largely governed by sea surface temperature gradients—robustly advect water vapor onshore regardless of topography. Thus, neither topography nor localized enthalpy air drives onshore monsoon flow.

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“…The geological framework of these Cenozoic basins (e.g., the Nangqian-Xialaxiu and Gongjue basins studied here) has been established (e.g., Horton et al, 2002;Spurlin et al, 2005;Studnicki-Gizbert et al, 2008) based on structural geology, stratigraphy, and isotopic dating of the exposed volcanic rocks (e.g., Zhou et al, 2002;Zhu et al, 2006a;Jiang et al, 2009;Du et al, 2011a). Recently, stable isotope paleoaltimetry has constrained the late Eocene paleoelevation of the Nangqian-Xialaxiu and the early Eocene paleoelevation of the Gongjue basins to 3.0 ± 1.1 km and 2.1-2.5 km, respectively (Tang et al, 2017;Li et al, 2018a). Moreover, paleomagnetic studies on the Nangqian-Xialaxiu and…”

Section: Introductionmentioning

confidence: 99%

Detrital zircon provenance comparison between the Paleocene-Eocene Nangqian-Xialaxiu and Gongjue basins: New insights for Cenozoic paleogeographic evolution of the eastern Tibetan Plateau

Zhang

Huang

Zhang

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

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Paleogeographic reconstructions of terranes can greatly benefit from the provenance analysis of sediments. A series of Cenozoic basins provide key sedimentary archives for investigating the growth of the Tibetan Plateau, yet the provenance of the sediments in these basins has never been constrained robustly. Here we report sedimentary petrological and detrital zircon geochronological data from the Paleocene-Eocene Nangqian-Xialaxiu and Gongjue basins. Sandstone detrital modes and zircon morphology suggest that the samples collected in these two basins were sourced from recycled orogen. Detrital zircon geochronology indicates that sediments ACCEPTED MANUSCRIPTthe Nangqian-Xialaxiu Basin are characterized by two distinct age populations at 220-280 Ma and 405-445 Ma. In contrast, three predominant age populations of 207-256 Ma, 423-445 Ma, and 1851-1868 Ma, and two subordinate age populations of ~50 Ma and ~2500 Ma, are recognized in the Gongjue Basin. Comparison with detrital zircon ages from the surrounding terranes suggests that sediments in the Nangqian-Xialaxiu Basin come from the neighboring thrust belts, whereas sediments from the Gongjue Basin are predominantly derived from the distant Songpan-Ganzi Terrane with minor contribution from the surrounding areas. A three-stage Cenozoic evolution of the eastern Tibetan Plateau is proposed. During the Paleocene, the Nangqian-Xialaxiu Basin appeared as a set of small intermontane sub-basins and received plentiful sediments from the neighboring mountain belts; during the Eocene, the Gongjue Basin kept a relatively low altitude and was a depression at the edge of a proto-Plateau; since the Oligocene, the Tibetan Plateau further uplifted and the marginal Gongjue Basin was involved in the Tibetan interior orogeny, indicating the eastward propagation of the Tibetan Plateau.

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Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet

Cited by 80 publications

References 87 publications

Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses

Anisotropy of Magnetic Susceptibility (AMS) Analysis of the Gonjo Basin as an Independent Constraint to Date Tibetan Shortening Pulses

Competing Topographic Mechanisms for the Summer Indo‐Asian Monsoon

Detrital zircon provenance comparison between the Paleocene-Eocene Nangqian-Xialaxiu and Gongjue basins: New insights for Cenozoic paleogeographic evolution of the eastern Tibetan Plateau

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