Late Silurian to Late Triassic seamount/oceanic plateau series accretion in Jinshajiang subduction mélange, Central Tibet, SW China

2019 ◽  
Vol 54 (2) ◽  
pp. 961-977 ◽  
Author(s):  
Yin Liu ◽  
Wenjiao Xiao ◽  
Brian F. Windley ◽  
Karel Schulmann ◽  
Rongshe Li ◽  
...  
Keyword(s):  
Late Triassic ◽  
Sw China ◽  
Oceanic Plateau ◽  
Central Tibet

Three stages of arc migration in the Carboniferous-Triassic in northern Qiangtang, central Tibet, China: Ridge subduction and asynchronous slab rollback of the Jinsha Paleotethys

2021 ◽  
Author(s):  
Yin Liu ◽  
Wenjiao Xiao ◽  
Brian F. Windley ◽  
Kefa Zhou ◽  
Rongshe Li ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Volcanic Rocks ◽  
Late Triassic ◽  
Geochemical Data ◽  
The Tibetan Plateau ◽  
Ridge Subduction ◽  
Temporal Relationships ◽  
Slab Rollback ◽  
Geodynamic Processes ◽  
Central Tibet

Carboniferous-Triassic magmatism in northern Qiangtang, central Tibet, China, played a key role in the evolution of the Tibetan Plateau yet remains a subject of intense debate. New geochronological and geochemical data from adakitic, Nb-enriched, and normal arc magmatic rocks, integrated with results from previous studies, enable us to determine the Carboniferous-Triassic (312−205 Ma), arc-related, plutonic-volcanic rocks in northern Qiangtang. Spatial-temporal relationships reveal three periods of younging including southward (312−252 Ma), rapid northward (249−237 Ma), and normal northward (234−205 Ma) migrations that correspond to distinct slab geodynamic processes including continentward slab shallowing, rapid trenchward slab rollback, and normal trenchward rollback of the Jinsha Paleotethys rather than the Longmuco-Shuanghu Paleotethys, respectively. Moreover, varying degrees of coexistence of adakites/High-Mg andesites (HMAs)/Nb-enriched basalt-andesites (NEBs) and intraplate basalts in the above-mentioned stages is consistent with the magmatic effects of slab window triggered by ridge subduction, which probably started since the Late Carboniferous and continued into the Late Triassic. The Carboniferous-Triassic multiple magmatic migrations and ridge-subduction scenarios provide new insight into the geodynamic processes of the Jinsha Paleotethys and the growth mechanism of the Tibetan Plateau.

Sedimentary record of Late Triassic transpressional tectonics of the Longmenshan thrust belt, SW China

2012 ◽  
Vol 48 ◽  
pp. 43-55 ◽  
Author(s):  
Bin Deng ◽  
Shugen Liu ◽  
Luba Jansa ◽  
Junxing Cao ◽  
Yang Cheng ◽  
...  
Keyword(s):  
Late Triassic ◽  
Thrust Belt ◽  
Sedimentary Record ◽  
Sw China ◽  
Longmenshan Thrust Belt

Petrogenesis and tectonic implications of Late-Triassic high ɛ Nd(t)-ɛ Hf(t) granites in the Ailaoshan tectonic zone (SW China)

2014 ◽  
Vol 57 (9) ◽  
pp. 2181-2194 ◽  
Author(s):  
HuiChuan Liu ◽  
YueJun Wang ◽  
WeiMing Fan ◽  
JianWei Zi ◽  
YongFeng Cai ◽  
...  
Keyword(s):  
Late Triassic ◽  
Tectonic Zone ◽  
Sw China ◽  
Tectonic Implications

scholarly journals Tectonic evolution and high-pressure rock exhumation in the Qiangtang Terrane, Central Tibet

2015 ◽  
Vol 7 (1) ◽  
pp. 329-367 ◽  
Author(s):  
Z. Zhao ◽  
P. D. Bons ◽  
G. Wang ◽  
A. Soesoo ◽  
Y. Liu
Keyword(s):  
High Pressure ◽  
Tectonic Evolution ◽  
Late Triassic ◽  
The South ◽  
Metamorphic Belt ◽  
The North ◽  
Ophiolitic Mélange ◽  
Basement Rocks ◽  
Central Tibet ◽  
Qiangtang Terrane

Abstract. Conflicting interpretations of the > 500 km long, east-west trending Qiangtang Metamorphic Belt have led to very different and contradicting models for the Permo-Triassic tectonic evolution of Central Tibet. We define two metamorphic events, one that only affected Pre-Ordovician basement rocks and one subduction-related Triassic high-pressure 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 non-metamorphic 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 un-metamorphosed Permian sediments and high-pressure 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. High-pressure 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.

Petrogenesis of the Late Triassic volcanic rocks in the Southern Yidun arc, SW China: Constraints from the geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes

Lithos ◽  
2014 ◽  
Vol 190-191 ◽  
pp. 363-382 ◽  
Author(s):  
Cheng-Biao Leng ◽  
Qiu-Yue Huang ◽  
Xing-Chun Zhang ◽  
Shou-Xu Wang ◽  
Hong Zhong ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Late Triassic ◽  
Hf Isotopes ◽  
Sw China ◽  
Yidun Arc

Subduction initiation triggered by accretion of a Jurassic oceanic plateau along the Bangong–Nujiang Suture in central Tibet

Terra Nova ◽  
2020 ◽  
Author(s):  
Wei‐Qi Zhang ◽  
Chuan‐Zhou Liu ◽  
Tong Liu ◽  
Chang Zhang ◽  
Zhen‐Yu Zhang
Keyword(s):  
Oceanic Plateau ◽  
Subduction Initiation ◽  
Central Tibet

scholarly journals Triassic limestone, turbidites and serpentinite–the Cimmeride orogeny in the Central Pontides

2014 ◽  
Vol 152 (3) ◽  
pp. 460-479 ◽  
Author(s):  
ARAL I. OKAY ◽  
DEMİR ALTINER ◽  
ALİ MURAT KILIÇ
Keyword(s):  
Middle Jurassic ◽  
Early Carboniferous ◽  
Upper Triassic ◽  
Late Triassic ◽  
Low Grade ◽  
Geological Data ◽  
Apparent Absence ◽  
Stratigraphic Sequence ◽  
Black Sea Region ◽  
Oceanic Plateau

AbstractThe basement of the Central Pontides, and by implication that of Crimea, consists of pre-Permian low-grade metaclastic rocks intruded by latest Permian – Early Carboniferous (305–290 Ma) granitoids. Further up in the stratigraphic sequence are Triassic limestones, which are now preserved as olistoliths in the deformed Upper Triassic turbidites. New conodont and foraminifera data indicate an Anisian to Carnian (Middle to Late Triassic) age for these hemi-pelagic Hallstatt-type limestones. The siliciclastic turbidites surrounding the Triassic limestone contain the Norian (Late Triassic) bivalveMonotis salinaria; the same species is also found in the Tauric series in Crimea. The Upper Triassic flysch in the Central Pontides is locally underlain by basaltic pillow lavas and includes kilometre-size tectonic slices of serpentinite. Both the flysch and the serpentinite are cut by an undeformed acidic intrusion with an Ar–Ar biotite age of 162 ± 4 Ma (Callovian–Oxfordian). This indicates that the serpentinite was emplaced into the turbidites before Middle Jurassic time, most probably during latest Triassic or Early Jurassic time, and that the deformation of the Triassic sequence pre-dates the Middle Jurassic. Regional geological data from the circum-Black Sea region, including widespread Upper Triassic flysch, Upper Triassic eclogites and blueschists of oceanic crustal affinity, and apparent absence of a ‘Cimmerian continent’ between the Cretaceous and Triassic accretionary complexes indicate that the latest Triassic Cimmeride orogeny was accretionary rather than collisional and is probably related to the collision and accretion of an oceanic plateau to the southern active margin of Laurasia.

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