U–Pb geochronology of basement rocks in central Tibet and paleogeographic implications

Guynn, Jerome H.; Kapp, Paul; Gehrels, George E.; Ding, Lin

doi:10.1016/j.jseaes.2011.09.003

Cited by 186 publications

(101 citation statements)

References 121 publications

(218 reference statements)

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“…Because of its unique geographic and geological setting, the Qiangtang block has attracted geologists from around the world. Recent studies have included studies of the crystalline basement Tan et al 2009;Wang et al 2009;Guynn et al 2012) and crust structure (Rodgers and Schwartz 1998;Unsworth et al 2004;Li et al 2006;, the metamorphic rocks of the central Qiangtang block (Kapp et al 2003;Zhang et al 2006;Zhai et al 2007Zhai et al , 2011, Mesozoic volcanic rocks Fu et al 2010;Zhai et al 2010;, Cenozoic volcanic rocks (Mo et al 2006;Ding et al 2007), oil shale (Fu et al 2011a, b) and petroleum exploration in the Mesozoic basin Wang et al 2004;Guo et al 2008;Wang et al 2009). Sedimentary studies show that the formation and closure of the Mesozoic Qiangtang basin were closely connected with the tectonic evolutionary processes in the Bangong-Nujiang Ocean (Wang et al 2004Zhang et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Song¹,

Wang²,

Fu³

et al. 2013

Terr. Atmos. Ocean. Sci.

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This study used a new set of zircon and apatite fission track ages to quantitatively document the tectonic evolution and cooling histories of the Qiangtang block of the central Tibetan Plateau. The results indicate that the Qiangtang block underwent three cooling stages at ~148 -73, ~50 -20, and ~20 -0 Ma. The three-stage cooling history and tectonic exhumation were controlled by the closure of the Bangong-Nujiang Suture during the Late Jurassic-Late Cretaceous, the India-Asia collision in the Paleogene, and the underthrusting of the India Plate during the Late Cenozoic. In addition to revealing the Late JurassicLate Cretaceous cooling events, the annealing patterns of the zircon fission track samples indicate different burial depths, which may help identify the Jurassic basin characteristics of the Qiangtang block. The apatite fission track (AFT) ages range from 60 ± 5 Ma to 26 ± 3 Ma, with a mean age of 44 Ma. These ages indicate that the Cenozoic exhumation of the Qiangtang block may have started in the Eocene. Inverse modeling of the AFT data shows that the Qiangtang block had a relatively slow cooling rate of approximately 0.5 -1°C Myr -1 from 50 to 20 Ma. After ~20 Ma, most of the samples show evidence for a rapid cooling stage with a cooling rate of 4 -6°C Myr -1 .

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Section: Introductionmentioning

confidence: 99%

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Song¹,

Wang²,

Fu³

et al. 2013

Terr. Atmos. Ocean. Sci.

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“…Despite the existence of Precambrian basement rocks like the Amdo micro-terrane [84], the Tibetan lithosphere may be primarily of a young Tethyan origin from a geophysical perspective [83]. A series of juvenile crust and arc-continental collisional and accretionary orogens developed along the southern margin of the Asian continent during the Paleozoic and Mesozoic, prior to the Indian and Asian continental collisions [85].…”

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confidence: 99%

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

et al. 2012

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Early-crystallizing chromian spinel (Cr-spinel) in the Nagqu ophiolite has high Os and low Re contents, and it is resistant to alteration during serpentinization, weathering and metamorphism. The chemical composition of primitive magma is preserved in Cr-spinel, which makes it suitable for determining the initial Os-isotope composition of the mantle source. This study presents Cr-spinel Os isotopes and zircon U-Pb ages for cumulate dunite and gabbro, respectively, in the same cumulate section of the ophiolite at Nagqu in Tibet. The results shed light on the formation and evolution of lithospheric mantle. The Nagqu ophiolite is located in the central part of the Bangong-Nujiang suture zone. It is a remnant of the Neotethyan oceanic crust, and contains cumulate dunite and gabbro. Zircon from the gabbro yielded a weighted mean 206 Pb/ 238 U age of 183.7±1 Ma. Cr-spinel exhibits  Os values of 0.2 to 0.3, suggesting that the mantle source for the dunite is similar to that of carbonaceous chondrites. Thus, the Tibetan lithosphere is primarily a relic of Tethyan oceanic lithosphere, which has formed by the transformation of the normal asthenospheric mantle in the Mesozoic. This is the first study to combine the spinel Os isotopes with accurate zircon U-Pb ages to constrain the geochemical characteristics of the mantle source for the ophiolite.Re-Os isotopes, spinel, ophiolite, Nagqu, Tibet Citation:Huang Q S, Shi R D, Liu D L, et al. Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications. Chin Sci Bull, 2013, 58: 9298,

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“…The Ando terrane is an isolated microcontinent within the BangongNujiang suture zone and bounded by Mesozoic ophiolites to its north and south sides (Guynn et al, 2006(Guynn et al, , 2012Shi et al, 2012;K.J. Zhang et al, 2014;X.Z.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…In this study, however, the Jurassic MORB-type gabbros, high-Mg diorites, calc-alkaline diorites and granodiorites entirely show arc affinity, providing reliable evidence for the existence of a Mesozoic continental arc once built on the Ando terrane. Based on the research of basement rocks and ophiolites in this area, the Ando terrane was suggested to be an isolated microcontinent during the Permian-Triassic and subjected to northward subduction in the Early Jurassic, resulting in metamorphism up to HP granulite-facies (Coward et al, 1988;Guynn et al, 2006Guynn et al, , 2012Shi et al, 2012;Xu et al, 1985;Zhang et al, 2012;K.J. Zhang et al, 2014;Zhu et al, 2013).…”

Section: Tectonic Setting In the Mesozoicmentioning

confidence: 99%

“…Recently, more and more evidence indicates that the preCenozoic tectonics and magmatism probably contributed to the accretion and formation of the central and northern Tibetan Plateau before the final India and Eurasian collision (Guynn et al, 2012;Kapp et al, 2003Kapp et al, , 2007Long et al, 2015;Murphy et al, 1997;Pullen et al, 2011). For example, an active continental margin is proposed to have developed in the Southern Qiangtang caused by the subduction of the Bangong-Nujiang Ocean (BNO), which is predated to the collision between the Lhasa and Qiangtang terranes Liu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Middle Jurassic MORB-type gabbro, high-Mg diorite, calc-alkaline diorite and granodiorite in the Ando area, central Tibet: Evidence for a slab roll-back of the Bangong-Nujiang Ocean

Yan

Long

Wang

et al. 2016

Lithos

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U–Pb geochronology of basement rocks in central Tibet and paleogeographic implications

Cited by 186 publications

References 121 publications

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Mesozoic and Cenozoic Cooling History of the Qiangtang Block, Northern Tibet, China: New Constraints from Apatite and Zircon Fission Track Data

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

Middle Jurassic MORB-type gabbro, high-Mg diorite, calc-alkaline diorite and granodiorite in the Ando area, central Tibet: Evidence for a slab roll-back of the Bangong-Nujiang Ocean

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