Blueschist-bearing metamorphic core complexes in the Qiangtang block reveal deep crustal structure of northern Tibet: Comment and Reply

Xia, Bican; Li, C.; Ye, H.F.

doi:10.1130/0091-7613(2001)029<0663:bbmcci>2.0.co;2

Cited by 6 publications

(4 citation statements)

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“…This cooling was likely a consequence of footwall exhumation during slip along the Rongma detachment, which must be younger than the Permian strata it cuts. Portions of the CQMB were at the Earth's surface by Late Triassic time, as indicated by the presence of metamorphic clasts within Upper Triassic sandstones [ Xia et al , 2001].…”

Section: Discussionmentioning

confidence: 99%

“…As melange formation and exhumation were coeval with early Mesozoic subduction along the Jinsha suture to the north, it was suggested that Qiangtang melange consists of Songpan‐Ganzi flysch and underlying strata that were thrust ∼200 km southward from the Jinsha suture beneath a single Qiangtang terrane of Gondwanan affinity (Figure 2b) [ Kapp et al , 2000; Kapp , 2001]. This model has been challenged recently by statements that the CQMB (1) is not comprised of melange, (2) was metamorphosed 50 to 100 Myr prior to Late Triassic–Early Jurassic exhumation, and (3) did not equilibrate at the high pressures predicted by the underthrusting model [ Deng et al , 2001; Xia et al , 2001; Zhang , 2001].…”

Section: Introductionmentioning

confidence: 99%

“…Late Cenozoic volcanic rocks in north central Tibet are shown in dark gray. statements that the CQMB (1) is not comprised of melange, (2) was metamorphosed 50 to 100 Myr prior to Late Triassic -Early Jurassic exhumation, and (3) did not equilibrate at the high pressures predicted by the underthrusting model [Deng et al, 2001;Xia et al, 2001;Zhang, 2001].…”

Section: Introductionmentioning

confidence: 99%

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Tectonic evolution of the early Mesozoic blueschist‐bearing Qiangtang metamorphic belt, central Tibet

et al. 2003

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[1] A >500-km-long east-west trending metamorphic belt in the Qiangtang terrane of central Tibet consists of tectonic melange that occurs in the footwalls of Late Triassic -Early Jurassic domal low-angle normal faults. The melange is comprised of a strongly deformed matrix of metasedimentary and mafic schists that encloses lesser-deformed blocks of metabasites, Carboniferous-Triassic metasedimentary rocks, and early Paleozoic gneiss. Both the blocks and melange matrix exhibit greenschist, epidoteblueschist, and locally, epidote-amphibolite facies mineral assemblages. Thermobarometry reveals that the metamorphic belt experienced pressures of >10 kbar. Maximum equilibration temperatures for mafic schists in the melange matrix decrease from east to west, from $660°C near Shuang Hu (33°N, 89°E), $500°C near Rongma (33°N, 87°E), to $425°C near Gangma Co (34°N, 84°E). Equilibration at consistently high pressures over a large range of temperatures is compatible with metamorphism of Qiangtang melange within a low-angle subduction zone beneath a continental margin. Coupled structural, thermobarometric, and 40 Ar/ 39 Ar studies suggest that Qiangtang melange was exhumed in an intracontinental setting from depths of >35 km to upper crustal levels in <12 Myr by Late TriassicEarly Jurassic crustal-scale normal faulting. Detrital zircons from metasandstones within the melange matrix yield U-Pb ion-microprobe ages that range from early Paleozoic to Early Archean, and could have been sourced from terranes to the north of the Jinsha suture. Our results support a model in which Qiangtang melange was underthrust $200 km beneath the Qiangtang terrane during early Mesozoic flat-slab southward subduction of Paleo-Tethyan oceanic lithosphere along the Jinsha suture. This model predicts that significant portions of the central Tibetan continental mantle lithosphere were removed during early Mesozoic low-angle oceanic subduction and that the present-day central Tibetan deeper crust includes large volumes of underthrust early Mesozoic melange.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tectonic evolution of the early Mesozoic blueschist‐bearing Qiangtang metamorphic belt, central Tibet

et al. 2003

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“…Some believe it to be the product of the Indo–Asian collision during the late Cenozoic period (Royden et al ., ; Wang et al ., 2008). Some believe that it incorporates the largest late Mesozoic magmatic arcs in the south (the Gangdese arc) and is remarkable evidence of the subduction history of the Tethys during the Mesozoic (Xia et al ., ; Ding et al ., ). However, its development and mode of occurrence are still open to intense debate.…”

Section: Tectonic Evolutionmentioning

confidence: 97%

Cenozoic tectonic evolution of the Tibetan Plateau – the Nepal Himalaya and the provenance of their foreland basins

Neupane

Tan

et al. 2016

Geological Journal

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The Tibetan Plateau and the Himalayan region formed after 55-50 Ma, as a result of the intracontinental collision of the Indian and Eurasian plates, occupying the east-west trending, high-altitude Himalaya and Karakorum ranges in the south and the vast Tibetan Plateau to the north of central Asia. The tectonic evolution of Tibet began between the late Palaeozoic and the Cenozoic, and the Himalayan mountain system evolved in a series of stages beginning 50-35 Ma and is still active.Active tectonics significantly affect upheaval and the rate of erosion in the Himalaya. Therefore, different foreland basins of the Tibetan Plateau (e.g. the Lhasa terrane, the Hoh Xil Basin, the Qaidam Basin, and the Jiuquan Basin) and the Himalayan foreland basins (e.g. Gondwanaland Basin and the Siwalik and Quaternary basin) experience direct effects in terms of tectonic and sedimentary evolution. For the tectonic evolution and provenance analysis of foreland basins in the Tibetan Plateau and the Nepal Himalaya, researchers have adopted various techniques in past studies: This paper discusses petrography, U-Pb geochronology, and seismic reflection.Provenance analyses have illustrated that the sediments of the Southern Tibetan foreland basin (i.e. the Lhasa terrane) derive from the Qiangtang, Tethys

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

Zhang

Cai

Zhang

et al. 2006

Earth and Planetary Science Letters

173

144

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Blueschist-bearing metamorphic core complexes in the Qiangtang block reveal deep crustal structure of northern Tibet: Comment and Reply

Cited by 6 publications

References 3 publications

Tectonic evolution of the early Mesozoic blueschist‐bearing Qiangtang metamorphic belt, central Tibet

Tectonic evolution of the early Mesozoic blueschist‐bearing Qiangtang metamorphic belt, central Tibet

Cenozoic tectonic evolution of the Tibetan Plateau – the Nepal Himalaya and the provenance of their foreland basins

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

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