scholarly journals A New Titanopteran from Southwestern Korean Peninsula: The Triassic Age of the Nampo Group and its Tectonic Implications

2021 ◽  
Author(s):  
Tae-Yoon S. Park ◽  
Do-Yoon Kim ◽  
Gi-Soo Nam ◽  
Mirinae Lee
Keyword(s):  
Central Asia ◽  
Korean Peninsula ◽  
Late Triassic ◽  
Surrounding Area ◽  
Phylogenetic Affinity ◽  
Geological Features ◽  
Cathaysia Block ◽  
Eclogite Facies ◽  
Predatory Insects ◽  
Tethys Ocean

Abstract Titanopterans are well-known as giant predatory insects in the Triassic, but not only their rare occurrences have been limited to Central Asia and Australia, but also their phylogenetic affinity remains unresolved. The age of the nonmarine sequences of the Nampo Group at the southwestern Korean Peninsula is unclear, and the tectonic affinity of the surrounding area is contentions. Here we report a new titanopteran Magnatitan jongheoni gen. et sp. nov. the Amisan Formation, Nampo Group, which marks the first discovery of the titanopteran fossil from outside Central Asia and Australia, presenting a possible circum-Tethys Ocean distribution, at least, during the Late Triassic. The new fossil shows a clearly divided CuPb, which will help understand the evolution of titanopterans in the future. Moreover, the occurrence of a titanopteran finally confirms the Late Triassic age of the Nampo Group. In China, similar Late Triassic non-marine sequences are widespread in the Cathaysia Block, in which various geological features similar to those in the southwestern Korean Peninsula, such as a Paleozoic magmatism and an eclogite facies with Neoproterozoic protoliths, have been recently documented as in the southeastern Korean Peninsula. Such similarities may suggest a close tectonic affinity between the northeastern Cathaysia Block and the southwestern Korean Peninsula.

North-South: Forecast of Socio-Economic and Political Dynamic (the end)

2011 ◽  
pp. 74-84
Author(s):  
I. Grishin
Keyword(s):  
Middle East ◽  
Central Asia ◽  
Korean Peninsula ◽  
Social Institutions ◽  
The South ◽  
East Central ◽  
The North ◽  
Long Cycles

The publication represents the outcomes of the regular academic seminar “Modern problems of development” conducted by the IMEMO Center of the problems of development and modernization. The relationships between the Center and the Periphery, the prospects for the development of the North and the South in the light of Kondrat'ev's long cycles theory, new technological modes and transformation of social institutions are discussed. For the next ten years the major conflicts in the Middle East, Central Asia, Pakistan, Afghanistan and the Korean peninsula are forecasted.

Late Triassic orogenic assembly of the Tibetan Plateau: constraints from magmatism and metamorphism in the east Lhasa terrane

2021 ◽  
Author(s):  
Yanfei Chen ◽  
Zeming Zhang ◽  
Richard M Palin ◽  
Zuolin Tian ◽  
Hua Xiang ◽  
...  
Keyword(s):  
Crustal Thickening ◽  
Late Triassic ◽  
The Tibetan Plateau ◽  
Plate Convergence ◽  
Lhasa Terrane ◽  
The North ◽  
Tectonic History ◽  
Peak Metamorphism ◽  
Tethys Ocean ◽  
Lower Crustal

Abstract The early Mesozoic evolution of the Lhasa terrane, which represents a major component of the Himalayan-Tibetan orogen, remains highly controversial. In particular, geological units and events documented either side of the eastern Himalayan syntaxis (EHS) are poorly correlated. Here, we report new petrological, geochemical and geochronological data for co-genetic peraluminous S-type granites and metamorphic rocks (gneiss and schist) from the Motuo–Bomi–Chayu region of the eastern Lhasa terrane, located on the eastern flank of the EHS. Zircon U–Pb dating indicates that these units record both Late Triassic magmatic (216–206 Ma) and metamorphic (209–198 Ma) episodes. The granites were derived from a Paleoproterozoic crustal source with negative zircon εHf(t) values (–5.5 to –16.6) and TDM2 model ages of 1.51–1.99 Ga, and are interpreted to have formed by crustal anatexis of nearby metasediments during collisional orogeny and crustal thickening. The gneisses and schists experienced similar upper amphibolite-facies peak metamorphism and associated partial melting, followed by decompressional cooling and retrograde metamorphism. These rocks were buried to lower-crustal depths and then exhumated to the surface in a collisional orogenic setting during plate convergence. From comparison of these data to other metamorphic belts with similar grades and ages, and association of coeval granitic magmatism widespread in the central-east Lhasa terrane, we propose that the studied co-genetic magmatism and metamorphism in the Motuo–Bomi–Chayu region records Late Triassic accretion of the North Lhasa and South Lhasa terranes, which represents the first evidence of the Paleo-Tethys ocean (PTO) closure in this part of Asia. These data provide new constraints on the spatial and temporal evolution of the Paleo-Tethyan Wilson Cycle and provide a ‘missing link’ to correlate the geology and tectonic history of the Lhasa terrane continental crust on either side of the EHS.

The alleged Triassic palaeodictyopteran is a member of Titanoptera

Zootaxa ◽  
2011 ◽  
Vol 3044 (1) ◽  
pp. 65 ◽  
Author(s):  
DMITRY E. SHCHERBAKOV
Keyword(s):  
Central Asia ◽  
Late Triassic

A sensational find of Palaeodictyoptera in the Mesozoic was recently reported from the Middle–Late Triassic of Central Asia (Ladinian–Carnian, Madygen Formation). The single, somewhat damaged wing described as Liquia reliquia was compared to nearly all possible groups of Pterygota and concluded to be an aberrant palaeodictyopteran with a concave MA (Béthoux et al. 2010). The venation of Liquia was interpreted correctly, but its taxonomic placement cannot be considered valid. Upon closer examination, the fossil immediately reveals its titanopteran affinities, resulting in the following synonymy: Paratitan Sharov, 1968 = Liquia Bethoux et al., 2010, syn. nov. (Titanoptera Paratitanidae); Paratitan reliquia (Bethoux et al., 2010), comb. nov. So far as known, no palaeodictyopteroids survived into the Mesozoic.

scholarly journals Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean

2015 ◽  
Vol 424 ◽  
pp. 69-83 ◽  
Author(s):  
Peiping Song ◽  
Lin Ding ◽  
Zhenyu Li ◽  
Peter C. Lippert ◽  
Tianshui Yang ◽  
...  
Keyword(s):  
Late Triassic ◽  
Tethys Ocean

scholarly journals Devonian to Triassic tectonic evolution and basin transition in the East Kunlun−Qaidam area, northern Tibetan Plateau: Constraints from stratigraphy and detrital zircon U−Pb geochronology

2021 ◽  
Author(s):  
Jiaopeng Sun ◽  
Yunpeng Dong ◽  
Licheng Ma ◽  
Shiyue Chen ◽  
Wan Jiang
Keyword(s):  
High Pressure ◽  
Tectonic Evolution ◽  
Late Triassic ◽  
The South ◽  
Northern Tibet ◽  
The North ◽  
Northern Tibetan Plateau ◽  
East Kunlun ◽  
North Qaidam ◽  
Tethys Ocean

The late Paleozoic to Triassic was an important interval for the East Kunlun−Qaidam area, northern Tibet, as it witnessed prolonged subduction of the South Kunlun Ocean, a major branch of the Paleo-Tethys Ocean whose closure led to the formation of Pangea. However, the geologic history of this stage is poorly constrained due to the paucity of tectonothermal signatures preserved during a magmatic lull. This article presents a set of new provenance data incorporating stratigraphic correlation, sandstone petrology, and zircon U−Pb dating to depict changes in provenance that record multiple stages of topographic and tectonic transition in the East Kunlun−Qaidam area over time in response to the evolution of the South Kunlun Ocean. Devonian intra-arc rifting is recorded by bimodal volcanism and rapid alluvial-lacustrine sedimentation in the North Qaidam Ultra High/High Pressure Belt, whose sources include the Olongbuluke Terrane and southern North Qaidam Ultra High/High Pressure Belt. Southward transgression submerged the East Kunlun−Qaidam area during the Carboniferous prior to the rapid uplift of the Kunlun arc, which changed the provenance during the Early Permian. This shift in provenance for the western Olongbuluke Terrane and thick carbonate deposition throughout the North Qaidam Ultra High/High Pressure Belt in the late Early Carboniferous indicate that the North Qaidam Ultra High/High Pressure Belt should have been inundated, terminating an ∼95 m.y. erosion history. The closure of the South Kunlun Ocean in the late Triassic generated a retroarc foreland along the Zongwulong Tectonic Belt, which is represented by the development of a deep-water, northward-tapering flysch deposystem that was supplied by the widely elevated Kunlun−Qaidam−Olongbuluke Terrane highland. This new scenario allows us to evaluate current models concerning the assembly of northern Tibet and the tectonic evolution of the Paleo-Tethys Ocean.

Sign in / Sign up

Export Citation Format

Share Document