Late Jurassic adakite˗like granodiorite along the southern Karakoram block, NE Pakistan: New evidence for subduction initiation of the Neo-Tethys Ocean

Lithos ◽  
2021 ◽  
pp. 106496
Author(s):  
Sher Sultan Baig ◽  
Chuandong Xue ◽  
M. Qasim Jan ◽  
Hafiz U. Rehman
Keyword(s):  
Late Jurassic ◽  
Subduction Initiation ◽  
Tethys Ocean ◽  
New Evidence

Magmatic gap associated with stepwise arc‐continent collision during the subduction of Banggong‐Nujiang Tethys Ocean: Evidence from Late Jurassic bimodal magmas

2020 ◽  
Author(s):  
Hua‐Sheng Shao ◽  
Guo‐Li Yuan ◽  
Zhi‐Bo Liu ◽  
Yang Song ◽  
Ran‐Xiao Huang
Keyword(s):  
Late Jurassic ◽  
Tethys Ocean

Timing of subduction initiation in the Proto-Tethys Ocean: Evidence from the Cambrian gabbros from the NE Pamir Plateau

Lithos ◽  
2018 ◽  
Vol 314-315 ◽  
pp. 40-51 ◽  
Author(s):  
Chuan-Lin Zhang ◽  
Hai-Bo Zou ◽  
Xian-Tao Ye ◽  
Xiang-Yan Chen
Keyword(s):  
Subduction Initiation ◽  
Tethys Ocean

scholarly journals New evidence of feathers in the Crato Formation supporting a reappraisal on the presence of Aves

2011 ◽  
Vol 83 (1) ◽  
pp. 197-210 ◽  
Author(s):  
Juliana M. Sayão ◽  
Antonio A.F. Saraiva ◽  
Angelica M.K. Uejima
Keyword(s):  
Late Jurassic ◽  
Primary Feather ◽  
The World ◽  
Large Bird ◽  
New Evidence ◽  
Previous Existence

The preservation of delicate structures such as feathers is very rare in the paleontological record, due to the fragility of their components. Fossil feathers have been reported from approximately 50 deposits around the world, from the Late Jurassic to the Pleistocene. In Brazil initial findings consisted of a primary feather of a large bird found in the Tremembé Formation. Other occurrences are preserved in the Crato Formation, where several symmetrical and one single asymmetrical feather was found. Based on three new specimens and reassessing further feather occurrences we cannot confirm the presence of volant Aves in this deposit. The presence of an asymmetrical feather without barbules and hooks hints at the previous existence of a flightless animal within this deposit, possibly a flightlessness bird or a non-avian theropod. Conversely, the presence of a feather from morphotype II present in Tyrannosauroidea, Compsognathidae, Therizinosauroidea and Dromeosauridae, points to a non-theropod origin. Since there are no confirmed records of birds and other feathered archosaurs in the region to date, more evidence is required to identify the animal from which these structures originated.

scholarly journals Boninitic blueschists record subduction initiation and subsequent accretion of an arc–forearc in the northeast Proto-Tethys Ocean

Geology ◽  
2021 ◽  
Author(s):  
Dong Fu ◽  
Bo Huang ◽  
Tim E. Johnson ◽  
Simon A. Wilde ◽  
Fred Jourdan ◽  
...  
Keyword(s):  
Subduction Zones ◽  
Plate Tectonics ◽  
Oceanic Lithosphere ◽  
Island Arc ◽  
Early Paleozoic ◽  
Subduction Initiation ◽  
North Qilian Orogenic Belt ◽  
Mariana Arc ◽  
Tethys Ocean ◽  
North Qilian

Subduction of oceanic lithosphere is a diagnostic characteristic of plate tectonics. However, the geodynamic processes from initiation to termination of subduction zones remain enigmatic mainly due to the scarcity of appropriate rock records. We report the first discovery of early Paleozoic boninitic blueschists and associated greenschists from the eastern Proto-Tethyan North Qilian orogenic belt, northeastern Tibet, which have geochemical affinities that are typical of forearc boninites and island arc basalts, respectively. The boninitic protoliths of the blueschists record intra-oceanic subduction initiation at ca. 492–488 Ma in the eastern North Qilian arc/forearc–backarc system, whereas peak blueschist facies metamorphism reflects subsequent subduction of the arc/forearc complex to high pressure at ca. 455 Ma. These relations therefore record the life circle of an intra-oceanic subduction zone within the northeastern Proto-Tethys Ocean. The geodynamic evolution provides an early Paleozoic analogue of the early development of the Izu–Bonin–Mariana arc and its later subduction beneath the extant Japanese arc margin. This finding highlights the important role of subduction of former upper plate island arc/forearcs in reducing the likelihood of preservation of initial subduction-related rock records in ancient orogenic belts.

scholarly journals Did the Benue Trough connect the Gulf of Guinea with the Tethys Ocean in the Cenomanian? New evidence from the palynostratigraphy of the Yola Sub-basin

2021 ◽  
Vol 119 ◽  
pp. 104683
Author(s):  
Musa B. Usman ◽  
Alexander T. Brasier ◽  
David W. Jolley ◽  
Usman Abubakar ◽  
Shehu Mukkafa
Keyword(s):  
Gulf Of Guinea ◽  
Benue Trough ◽  
Tethys Ocean ◽  
New Evidence

New evidence ofCeratosaurus(Dinosauria: Theropoda) from the Late Jurassic of the Lusitanian Basin, Portugal

2014 ◽  
Vol 27 (7) ◽  
pp. 938-946 ◽  
Author(s):  
Elisabete Malafaia ◽  
Francisco Ortega ◽  
Fernando Escaso ◽  
Bruno Silva
Keyword(s):  
Late Jurassic ◽  
New Evidence ◽  
Lusitanian Basin

scholarly journals Southern high-latitude warmth during the Jurassic–Cretaceous: New evidence from clumped isotope thermometry

Geology ◽  
2019 ◽  
Vol 47 (8) ◽  
pp. 724-728 ◽  
Author(s):  
Madeleine L. Vickers ◽  
David Bajnai ◽  
Gregory D. Price ◽  
Jolien Linckens ◽  
Jens Fiebig
Keyword(s):  
Late Jurassic ◽  
Climate Models ◽  
High Latitudes ◽  
Proxy Data ◽  
Average Temperature ◽  
Clumped Isotope ◽  
Southern High Latitude ◽  
Near Future ◽  
New Evidence ◽  
Southern Atlantic Ocean

Abstract In order to understand the climate dynamics of the Mesozoic greenhouse world, it is vital to determine paleotemperatures from higher latitudes. For the Jurassic and Cretaceous climate, there are significant discrepancies between different proxies and between proxy data and climate models. We determined paleotemperatures from Late Jurassic and Early Cretaceous belemnites using the carbonate clumped isotope paleothermometer and compared these values to temperatures derived from TEX86 and other proxies. From our analyses, we infer an average temperature of ∼25 °C for the upper part of the water column of the southern Atlantic Ocean. Our data imply that for mid- to high latitudes, climate models underestimate marine temperatures by >5 °C and, therefore, the amount of warming that would accompany an increase in atmospheric CO2 of more than 4× pre-industrial levels, as is projected for the near future.

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