Early Cretaceous Na-rich granitoids and their enclaves in the Tengchong Block, SW China: Magmatism in relation to subduction of the Bangong–Nujiang Tethys ocean

Lithos ◽  
2017 ◽  
Vol 286-287 ◽  
pp. 175-190 ◽  
Author(s):  
Ren-Zhi Zhu ◽  
Shao-Cong Lai ◽  
M. Santosh ◽  
Jiang-Feng Qin ◽  
Shao-Wei Zhao
Keyword(s):  
Early Cretaceous ◽  
Sw China ◽  
Tethys Ocean

Geochemistry and geochronology of gabbros from the Asa Ophiolite, Tibet: Implications for the early Cretaceous evolution of the Meso-Tethys Ocean

Lithos ◽  
2018 ◽  
Vol 320-321 ◽  
pp. 192-206 ◽  
Author(s):  
Xiao-Wen Zeng ◽  
Ming Wang ◽  
Jian-Jun Fan ◽  
Cai Li ◽  
Chao-Ming Xie ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Tethys Ocean

East Asian orogenic collapse caused by oblique subduction and reduced boundary force

2021 ◽  
Author(s):  
Mark Allen ◽  
Shuguang Song ◽  
Jean-Arthur Jean-Arthur Olive ◽  
Yang Chu ◽  
Chao Wang
Keyword(s):  
East Asia ◽  
Early Cretaceous ◽  
Middle Jurassic ◽  
East Asian ◽  
Force Balance ◽  
Sw China ◽  
Oblique Subduction ◽  
Crustal Thinning ◽  
Boundary Force ◽  
Thick Crust

<p>East Asia experienced compressional deformation in the early Mesozoic, across the South China Block, North China Craton (NCC) and the part of the Central Asian Orogenic Belt to the north of the NCC. Deformation and magmatism resulted from Triassic collisions that accreted the continental blocks, and also Izanagi (Paleo-Pacific) Plate subduction from the east. We suggest that there was a single East Asian orogenic plateau by the Middle Jurassic, from NE Russia to SW China, with a length of ~4000 km. The causes and timings of the destruction of this plateau are unclear, especially loss of the lower lithosphere of the NCC. Here, we synthesize evidence for late Mesozoic and early Cenozoic crustal thinning via extension and denudation, to quantify the previous crustal thickness. We find that there was a ~50 km thick crust by the Middle Jurassic across much of the area between NE Asia and SW China, which has since undergone ~30% thinning. A force balance indicates that the buoyancy force produced by the gravitational potential energy of this thick crust drove extension from the latest Jurassic - Early Cretaceous (~145 Ma), when a rapid switch from orthogonal to oblique subduction at the Asia-Izanagi plate margin reduced the compressive boundary force by ~30%. Mantle lithosphere thinning of the NCC exceeds crustal thinning by a factor of ~2; extensional collapse cannot be the only cause of cratonic destruction, but played a major role, and potentially triggered mantle instability. Early Cretaceous extension was accompanied by a flare-up in volcanism along East Asia, which we speculate contributed to the Cretaceous hothouse climate.</p>

Triassic collision in the Paleo-Tethys Ocean constrained by volcanic activity in SW China

Lithos ◽  
2012 ◽  
Vol 144-145 ◽  
pp. 145-160 ◽  
Author(s):  
Jian-Wei Zi ◽  
Peter A. Cawood ◽  
Wei-Ming Fan ◽  
Yue-Jun Wang ◽  
Eric Tohver ◽  
...  
Keyword(s):  
Volcanic Activity ◽  
Sw China ◽  
Tethys Ocean

Triassic ore-bearing and barren porphyries in the Zhongdian Arc of SW China: implications for the subduction of the Palaeo-Tethys Ocean

2017 ◽  
Vol 59 (11) ◽  
pp. 1490-1505 ◽  
Author(s):  
Peng Wang ◽  
Guochen Dong ◽  
M. Santosh ◽  
Xuefeng Li ◽  
Meiling Dong
Keyword(s):  
Sw China ◽  
Tethys Ocean

scholarly journals Taxonomic diversity dynamics of early cretaceous brachiopods and gastropods in the Azerbaijanian domains of the Lesser Caucasus (Neo-Tethys Ocean)

2014 ◽  
pp. 17-31 ◽  
Author(s):  
Dmitry Ruban
Keyword(s):  
Early Cretaceous ◽  
Benthic Invertebrates ◽  
Taxonomic Diversity ◽  
Northern Caucasus ◽  
Tectonic Zones ◽  
Tethys Ocean ◽  
Lesser Caucasus ◽  
A Minor ◽  
Marine Benthic Invertebrates ◽  
Diversity Dynamics

Palaeontological data available from the Azerbaijanian domains (Somkhit-Agdam, Sevan-Karabakh, and Miskhan-Kafan tectonic zones) of the Lesser Caucasus permit reconstruction of the regional taxonomic diversity dynamics of two groups of Early Cretaceous marine benthic invertebrates. Stratigraphical ranges of 31 species and 14 genera of brachiopods and 40 species and 31 genera of gastropods are considered. The total number of species and genera of brachiopods was low in the Berriasian-Valanginian and then rose to peak in the Barremian. Then, the diversity declined in the Aptian, and brachiopods are not known regionally from the Albian. Gastropods appeared in the Hauterivian and experienced a strong radiation in the Barremian. The diversity of species and genera declined in the Aptian (with a minor radiation in the Middle Aptian), and no gastropods are reported from the Albian. Globally, the number of brachiopod genera remained stable through the Early Cretaceous, and the number of gastropod genera increased stepwise with the maximum in the Albian. The regional and global patterns of the diversity dynamics differed for the both groups of marine benthic invertebrates. The Barremian maximum of the taxonomic diversity coincided with the regional flourishing of reefal ecosystems. The taxonomic diversity dynamics of brachiopods in the Azerbaijanian domains of the Lesser Caucasus is very similar to those of the Northern Caucasus, which is an evidence of proximity of these regions during the Early Cretaceous.

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