Eclogites from central Qiangtang, northern Tibet (China) and tectonic implications

Zhang, Kaijun; Cai, Jianjun; Zhang, Yuxiu; Zhao, Taiping

doi:10.1016/j.epsl.2006.02.025

Cited by 174 publications

(146 citation statements)

References 33 publications

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“…Most authors propose high-pressure metamorphism at the downgoing slab, with subsequent exhumation in the orogenic wedge, possibly related to slab break-off (e.g. Zhang, 2006a;Li et al, 2009;Liu et al, 2011;Yang et al, 2011;Zhai et al, 2011aZhai et al, , b, 2012Tang and Zhang, 2013). One problem with this exhumation in a convergent setting is that it should be related to extensive erosion during exhumation, which appears inconsistent with the regional sedimentary record (Pullen and Kapp, 2014).…”

Section: Models For Exhumation Of High-pressure Rocksmentioning

confidence: 99%

“…High-pressure rocks, including blueschists and eclogites, as well as subduction mélange with ophiolitic fragments are found scattered over an > 500 km long, EW-striking belt in the middle of the Qiangtang terrane: the central Qiangtang metamorphic belt (Kapp et al, 2003b;Zhang et al, 2006a;Liu et al, 2011). Ar-Ar analyses on synkinematic phengite, zircon U-Pb and Lu-Hf isotopic ages from high-pressure units yielded ages from 244 to 214 Ma (Pullen et al, 2008;Zhai et al, 2011b), which is interpreted to provide an estimate for the age of suture zone closing ) as well as exhumation of the high-pressure rocks.…”

Section: Regional Settingmentioning

confidence: 99%

“…1b). They consist of phengite-quartz schists, blueschists and eclogites (Kapp et al, 2003b;Liu et al, 2011;Zhai et al, 2011b;Zhang et al, 2006a). Peak metamorphic age is ∼ 244 Ma and exhumation occurred around 220-214 Ma (Zhai et al, 2011b;Pullen et al, 2011).…”

Section: Lithologies and Metamorphism Of The Mélange In The Qiangtangmentioning

confidence: 99%

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Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

et al. 2015

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Abstract. Conflicting interpretations of the > 500 km long, east-west-trending Qiangtang metamorphic belt have led to very different and contradicting models for the PermoTriassic tectonic evolution of central Tibet. We define two metamorphic events, one that only affected pre-Ordovician basement rocks and one subduction-related Triassic highpressure metamorphism event. Detailed mapping and structural analysis allowed us to define three main units that were juxtaposed due to collision of the north and south Qiangtang terranes after closure of the Ordovician-Triassic ocean that separated them. The base is formed by the Precambrian-Carboniferous basement, followed by nonmetamorphic ophiolitic mélange containing mafic rocks that range in age from the Ordovician to Middle Triassic. The top of the sequence is formed by strongly deformed sedimentary mélange that contains up to > 10 km size rafts of both unmetamorphosed Permian sediments and highpressure blueschists. We propose that the high-pressure rocks were exhumed from underneath the south Qiangtang terrane in an extensional setting caused by the pull of the northward subducting slab of the Shuanghu-Tethys. Highpressure rocks, sedimentary mélange and margin sediments were thrust on top of the ophiolitic mélange that was scraped off the subducting plate. Both units were subsequently thrust on top of the south Qiantang terrane continental basement. Onset of Late Triassic sedimentation marked the end of the amalgamation of both Qiangtang terranes and the beginning of spreading between Qiantang and north Lhasa to the south, leading to the deposition of thick flysch deposits in the Jurassic.

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Section: Models For Exhumation Of High-pressure Rocksmentioning

confidence: 99%

Section: Regional Settingmentioning

confidence: 99%

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Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

et al. 2015

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“…10) (Weislogel, 2008;Zhou and Graham, 1996). Thus, the Triassic flysch deposits in the Songpan-Ganzi basin underwent tectonic thickening, and rapid erosion of the QinlingDabie orogen, the North China Block to the north, the South China Block to the east, and the Qiangtang Block to the south (e.g., Bruguier et al, 1997;Nie et al, 1994;She et al, 2006;Weislogel, 2008;Weislogel et al, 2006;Zhang et al, 2006b;Zhou and Graham, 1996). This also implies that, although the Triassic sedimentary rocks in the eastern Songpan-Ganzi basin belonged to deposits of a possible foreland basin (Yuan et al, 2010), contemporaneous rocks in the central-western Songpan-Ganzi basin represent deposits in a remnant ocean basin (Yin and Harrison, 2000).…”

Section: Tectonic Implicationsmentioning

confidence: 99%

“…The source and tectonic setting of the strata, consisting of flysch or turbidite, have attracted wide interest. These sedimentary rocks were considered to have been derived by erosion of the Qinling-Dabie orogen and the North China Block to the north, the South China Block to the east, or the Qiangtang Block to the south-southwest (e.g., Bruguier et al, 1997;Nie et al, 1994;She et al, 2006;Weislogel, 2008;Weislogel et al, 2006;Yin and Harrison, 2000;Zhang et al, 2006b;Zhou and Graham, 1996). The tectonic setting of these sedimentary strata has long been disputed.…”

Section: Introductionmentioning

confidence: 99%

Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications

Wang

Chung

et al. 2011

Lithos

102

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Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

Zhang

Tyrrell

Chang-an

et al. 2014

Geochem Geophys Geosyst

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The upper-middle Yangtze River drains the Qiangtang Block, the Songpan-Ganzi, the Yangtze Craton, and the Qinling-Dabie orogenic belt. These tectonic units have been shown to have heterogeneous Pb isotopic compositions, which allow this isotope system to be used as a sediment provenance tool. In this study we have employed laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) to measure Pb isotope compositions of sand-sized K-feldspar grains from the upper-middle Yangtze River. Data are presented from four major tributaries: Yalongjiang, Minjiang, Jialingjiang, and Hanjiang, as well as from the main Yangtze River near Yichang. A portion of K-feldspar grains in the Yalongjiang shows an ultraradiogenic character ( 206 Pb/ 204 Pb > 20), which is unique in the upper-middle Yangtze. Moreover, these ultraradiogenic grains were transported as far as Yichang, just downstream from the Three Gorges, suggesting that the Pb-in-K-feldspar method could be applied to the sediments within the Jianghan Basin to date the formation of the Three Gorges. Pb isotopic data from Yichang indicate that erosion in the Longmen Shan and neighboring regions is more important than the Jinshajiang in supplying sediment. The grains in Hanoi Basin have little overlap with the Songpan-Ganzi, but show a good match with the Yangtze Craton in its range of lower 206 Pb/ 204 Pb ratios. These observations support the idea that the ''Middle Yangtze'' used to be a tributary of the paleo-Red River and that there has been no drainage linking the SongpanGanzi and the Red River since the Eocene.

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Eclogites from central Qiangtang, northern Tibet (China) and tectonic implications

Cited by 174 publications

References 33 publications

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications

Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

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