The Ailao Shan-Red River shear zone (Yunnan, China), Tertiary transform boundary of Indochina

Leloup, Philippe‐Hervé; Lacassin, Robin; Tapponnier, Paul; Schärer, Urs; Zhong, Dandan; Liu, Xiaohan; Zhang, Liangshang; Ji, Shaocheng; Trinh, Phan Trong

doi:10.1016/0040-1951(95)00070-4

Cited by 1,027 publications

(651 citation statements)

References 97 publications

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“…The subduction of additional oceanic crust from a Cretaceous-age back-arc along southern Lhasa is also largely consistent with the timing of magmatic episodes north of the YarlungTsangpo Suture Zone and the large latitudinal range of positive seismic velocity anomalies in seismic tomography beneath the convergence zone. The significant convergence rate drop between India and Eurasia by $40 Ma correlates to the final continentcontinent collision that better explains changes in magmatism [Debon et al, 1986;Miller et al, 1999;Xia et al, 2011], high pressure/temperature metamorphism near the suture zone [Cottle et al, 2009], marine deposition as young as $34 Ma [Wang et al, 2002] and the onset of Indochina extrusion by $35 Ma [Leloup et al, 2007[Leloup et al, , 1995Tapponnier et al, 1990]. In contrast, a continent-continent collision soon after $60 Ma as proposed by the conventional models requires extreme shortening of Lhasa, an extremely large Greater India and a 20 Myr time lag to account for these major events recorded in the regional geology.…”

Section: Resultsmentioning

confidence: 99%

Insights on the kinematics of the India‐Eurasia collision from global geodynamic models

Zahirovic

Müller

Seton

et al. 2012

Geochem Geophys Geosyst

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[1] The Eocene India-Eurasia collision is a first order tectonic event whose nature and chronology remains controversial. We test two end-member collision scenarios using coupled global plate motion-subduction models. The first, conventional model, invokes a continental collision soon after $60 Ma between a maximum extent Greater India and an Andean-style Eurasian margin. The alternative scenario involves a collision between a minimum extent Greater India and a NeoTethyan back-arc at $60 Ma that is subsequently subducted along southern Lhasa at an Andean-style margin, culminating with continent-continent contact at $40 Ma. Our numerical models suggest the conventional scenario does not adequately reproduce mantle structure related to Tethyan convergence. The alternative scenario better reproduces the discrete slab volumes and their lateral and vertical distribution in the mantle, and is also supported by the distribution of ophiolites indicative of Tethyan intraoceanic subduction, magmatic gaps along southern Lhasa and a two-stage slowdown of India. Our models show a strong component of southward mantle return flow for the Tethyan region, suggesting that the common assumption of near-vertical slab sinking is an oversimplification with significant consequences for interpretations of seismic tomography in the context of subduction reference frames.

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Section: Resultsmentioning

confidence: 99%

Insights on the kinematics of the India‐Eurasia collision from global geodynamic models

Zahirovic

Müller

Seton

et al. 2012

Geochem Geophys Geosyst

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“…Several models have been proposed to explain the formation of the SCS: (1) the association as a result of the India-Asia collision (Tapponnier et al 1982;Leloup et al 1995); (2) a slab pull and subduction of the proto-South China Sea under Sabah/Borneo Hayes 1980, 1983;Holloway 1982;Hall 2002);and, (3) an extension related to an upwelling mantle plume (e.g., Fan and Menzies 1992). The South China Sea consists of three sections, the northern continental margin, oceanic basin and southern continental margin.…”

Section: Introductionmentioning

confidence: 99%

Age and Geochemical Features of Dredged Basalts from Offshore SW Taiwan: The Coincidence of Intra-Plate Magmatism with the Spreading South China Sea

Wang¹,

Lo²,

Chung³

et al. 2012

Terr. Atmos. Ocean. Sci.

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This study reports age and geochemical analyses of basaltic rocks dredged from volcanic seamounts offshore SW Taiwan. 40 Ar/ 39Ar dating results of these rocks show them to be of the early Miocene age of ~22 -21 Ma. They are evolved alkali basalts that show OIB-type geochemical features similar to post-spreading seamount basalts (14 -3.5 Ma) in the South China Sea (SCS) and Miocene intraplate basalts on the Penghu Islands (16 -8 Ma) and NW Taiwan (23 -9 Ma). Their Sr-Nd-Pb isotope data plot within the range of the SCS seamount basalts that show an EM2-like component in the mantle source. The age and overall geochemical characteristics of the dredged basalts are comparable to those of the Kungkuan basalts, NW Taiwan and Baolai basalts, SW Taiwan, suggesting an extensive alkali basaltic volcanism along the southeastern Eurasian continental margin during the early Miocene that resulted from regional lithospheric extension in association with seafloor spreading in the South China Sea.

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“…However, the activation of the large strike-slip faults, which appear to have propagated eastward (Metivier et al 1998;Meyer et al 1998), was diachronous, starting earlier in the south than in the north (Gaudemer et al 1995;Leloup et al 1995). The age of strongly folded detrital sediments younger than 100 Ma also decreases northward across the plateau (Tapponnier et al 1990).…”

Section: Discussionmentioning

confidence: 99%

“…Rotation is clearly evident in modern GPS data (Zhang et al 2004). Large areas of Indochina are being extruded to the south through various shear zones (see Akciz et al 2008;Gilley et al 2003;Harrison et al 1992;Lacassin et al 1996;Leloup and Kienast 1993;Leloup et al 1995Leloup et al , 2001Scharer et al 1990). This tectonic shear zone characterizes the middle reaches of the TRR.…”

Section: Regional Settingmentioning

confidence: 99%

Analysis of longitudinal profiles along the eastern margin of the Qinghai-Tibetan Plateau

Aiken

Brierley

2013

J. Mt. Sci.

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Abstract:Resulting from the collision of the Eurasian and Indian plates, the Qinghai-Tibetan Plateau is commonly known as the 'roof of the world'. Collectively the Yarlung Tsangpo, Nu, Lancang, Yangtze, Yalong, and Yellow River basins drain the eastern margin of the plateau. In this paper, we utilize Shuttle Radar Topography Mission elevation data to examine morphometric and relief attributes of these basins to reveal insights into tectonic activity and rates of incision. A robust technique using Matlab is proposed to alleviate errors associated with SRTM data in the derivation of river longitudinal profiles. Convex longitudinal profiles are interpreted to be a product of uplift rates that exceed rates of channel incision along the entire margin of the QinghaiTibetan Plateau. Highest relief towards the south reflects extensive fluvial incision. High relief is also prominent along major active faults. Erosion patterns are related to distance from knickpoints. Highest rates of erosion and incision are evident towards the south, with decreasing values towards the north, suggesting a link between tectonic activity and erosion.

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The Ailao Shan-Red River shear zone (Yunnan, China), Tertiary transform boundary of Indochina

Cited by 1,027 publications

References 97 publications

Insights on the kinematics of the India‐Eurasia collision from global geodynamic models

Insights on the kinematics of the India‐Eurasia collision from global geodynamic models

Age and Geochemical Features of Dredged Basalts from Offshore SW Taiwan: The Coincidence of Intra-Plate Magmatism with the Spreading South China Sea

Analysis of longitudinal profiles along the eastern margin of the Qinghai-Tibetan Plateau

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