Newly discovered Early Carboniferous and Late Permian magmatic rocks in eastern Myanmar: Implications for the tectonic evolution of the eastern Paleo-Tethys

2022 ◽  
pp. 105093
Author(s):  
Fangyang Hu ◽  
Fu-Yuan Wu ◽  
Jian-Gang Wang ◽  
Mihai N. Ducea ◽  
James B. Chapman ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Early Carboniferous ◽  
Late Permian ◽  
Magmatic Rocks

scholarly journals Stratigraphy and depositional history of the Upper Palaeozoic and Triassic sediments in the Wandel Sea Basin, central and eastern North Greenland

1989 ◽  
Vol 143 ◽  
pp. 21-45
Author(s):  
L Stemmerik ◽  
E Håkansson
Keyword(s):  
Early Carboniferous ◽  
Upper Permian ◽  
Lower Permian ◽  
Late Permian ◽  
The West ◽  
Depositional History ◽  
Lower Carboniferous ◽  
Upper Carboniferous ◽  
Lithostratigraphic Units ◽  
History Of

A lithostratigraphic scheme is erected for the Lower Carboniferous to Triassic sediments of the Wandel Sea Basin, from Lockwood Ø in the west to Holm Land in the east. The scheme is based on the subdivision into the Upper Carboniferous - Lower Permian Mallemuk Mountain Group and the Upper Permian - Triassic Trolle Land Group. In addition the Upper Carboniferous Sortebakker Formation and the Upper Permian Kap Kraka Formation are defined. Three formations and four members are included in the Mallemuk Mountain Group. Lithostratigraphic units include: Kap Jungersen Formation (new) composed of interbedded limestones, sandstones and shales with minor gypsum - early Moscovian; Foldedal Formation composed of interbedded limestones and sandstones -late Moseovian to late Gzhelian; Kim Fjelde Formation composed of well bedded Iimestones - late Gzhelian to Kungurian. The Trolle Land Group includes three formations: Midnatfjeld Formation composed of dark shales, sandstones and limestones - Late Permian; Parish Bjerg Formation composed of a basal conglomeratic sandstone overlain by shales and sandstones - ?Early Triassic (Scythian); Dunken Formation composed of dark shales and sandstones - Triassic (Scythian-Anisian). The Sortebakker Formation (new) is composed of interbedded sandstones, shales and minor coal of floodplain origin. The age is Early Carboniferous. The Kap Kraka Formation (new) includes poorly known hematitic sandstones, conglomerates and shales of Late Permian age.

scholarly journals Tectonic Evolution of the West Bogeda: Evidences from Zircon U-Pb Geochronology and Geochemistry Proxies, NW China

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 341
Author(s):  
Yalong Li ◽  
Wei Yue ◽  
Xun Yu ◽  
Xiangtong Huang ◽  
Zongquan Yao ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Tectonic Setting ◽  
Continental Rift ◽  
Middle Permian ◽  
Upper Permian ◽  
Late Permian ◽  
Island Arcs ◽  
The West ◽  
Structural Deformations ◽  
Tian Shan

The Bogeda Shan (Mountain) is in southern part of the Central Asian Orogenic Belt (CAOB) and well preserved Paleozoic stratigraphy, making it an ideal region to study the tectonic evolution of the CAOB. However, there is a long-standing debate on the tectonic setting and onset uplift of the Bogeda Shan. In this study, we report detrital zircon U-Pb geochronology and whole-rock geochemistry of the Permian sandstone samples, to decipher the provenance and tectonic evolution of the West Bogeda Shan. The Lower-Middle Permian sandstone is characterized by a dominant zircon peak age at 300–400 Ma, similar to the Carboniferous samples, suggesting their provenance inheritance and from North Tian Shan (NTS) and Yili-Central Tian Shan (YCTS). While the zircon record of the Upper Permian sandstone is characterized by two major age peaks at ca. 335 Ma and ca. 455 Ma, indicating the change of provenance after the Middle Permian and indicating the uplift of Bogeda Shan. The initial uplift of Bogeda Shan was also demonstrated by structural deformations and unconformity occurring at the end of Middle Permian. The bulk elemental geochemistry of sedimentary rocks in the West Bogeda Shan suggests the Lower-Middle Permian is mostly greywacke with mafic source dominance, and tectonic setting changed from the continental rift in the Early Permian to post rift in the Middle Permian. The Upper Permian mainly consists of litharenite and sublitharenite with mafic-intermediate provenances formed in continental island arcs. The combined evidences suggest the initial uplift of the Bogeda Shan occurred in the Late Permian, and three stages of mountain building include the continental rift, post-rift extensional depression, and continental arc from the Early, Middle, to Late Permian, respectively.

scholarly journals Correlation of magmatic and tectonic events in the evolution of the West Chukotka ophiolites

2019 ◽  
Vol 486 (2) ◽  
pp. 202-207
Author(s):  
A. V. Ganelin ◽  
S. D. Sokolov
Keyword(s):  
Arctic Ocean ◽  
Tectonic Evolution ◽  
Late Jurassic ◽  
Early Carboniferous ◽  
The West ◽  
Tectonic Events ◽  
Geodynamic Processes

The article is an overview of the magmatic and geodynamic processes that formed Aluchin and Gromadnen-Vurguvem ophiolites in the territory of Western Chukotka. The ophiolites formed into a convergent system between the Siberian continent and the Proto-Arctic Ocean. In the tectonic evolution of this system, important milestones have been identified: the Early Carboniferous, the Later Triassic and the Late Jurassic.

U–Pb geochronology of late Neoarchean tonalites in the Flin Flon Belt, Trans-Hudson Orogen: surprise at surface

1994 ◽  
Vol 31 (12) ◽  
pp. 1785-1790 ◽  
Author(s):  
J. David ◽  
E. C. Syme
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
Volcanic Belt ◽  
Lake Area ◽  
Magmatic Rocks ◽  
Flin Flon ◽  
First Time

The Flin Flon volcanic belt of the Trans-Hudson Orogen in northern Manitoba comprises magmatic rocks (1.88 – 1.90 Ga) generated in an intra-oceanic arc and identified as one of the best examples of juvenile Paleoproterozoic crust. In the Flin Flon – Athapapuskow Lake area, the belt consists of a series of fault-bounded blocks, each having distinct stratigraphic and magmatic affinities, juxtaposed to form an accretionary collage. Two tonalitic bodies within the Northeast Arm shear zone, a major deformation corridor separating two of the most important blocks in the area, have been dated by the U–Pb zircon method at [Formula: see text] and [Formula: see text]. These results indicate the presence of fragments of late Neoarchean crust within the Flin Flon belt, possibly related to ca. 2.5 Ga granitic bodies found in terranes beyond the western limit of the belt. The presence of ca. 2.5 Ga tonalites within the Flin Flon Belt, herein reported for the first time, has major implications for basement involvement in the early tectonic evolution of the Flin Flon Belt.

The Polish Sudetes: Caledonian or Variscan?

1999 ◽  
Vol 90 (2) ◽  
pp. 127-146 ◽  
Author(s):  
P. Aleksandrowski ◽  
R. Kryza ◽  
S. Mazur ◽  
C. Pin ◽  
J. A. Zalasiewicz
Keyword(s):  
Tectonic Evolution ◽  
Structural Data ◽  
Early Carboniferous ◽  
Continental Collision ◽  
Tectonic Activity ◽  
Late Devonian ◽  
Early Permian ◽  
Granite Intrusion ◽  
Form Part ◽  
Early Palaeozoic

AbstractThe Polish Sudetes on the NE margin of the Bohemian Massif comprise a complex mosaic of pre-Permian basement units, traditionally included in the Variscides. A hypothesis of significant Caledonian orogenesis in this area originated in the 1920s, was subsequently rejected, and then was recently revived in models which invoked Early Palaeozoic to Early-Mid Devonian subduction and continental collision along a proposed extension of the Tornquist suture zone. We reassess the evidence invoked in support of the Caledonian orogeny, such as supposed regional pre-Upper Devonian unconformity, Ordovician bimodal magmatism and radiometric, palaeontological, palaeomagnetic and structural data, and suggest these are either inconclusive or misinterpreted. On the other hand, the Sudetes record Mid?-Late Devonian blueschist metamorphism followed by an Early Carboniferous regional high temperature event, widespread Late Devonian/Early Carboniferous flysch/molasse sedimentation and abundant granite intrusion in the Carboniferous to Early Permian. We discuss the usage of the term ‘Caledonian’ in a plate tectonic context and suggest it should not be used simply to denote Early to Mid-Palaeozoic tectonic activity. The tectonic evolution of the Sudetes was temporally different from, and resulted from convergence of different crustal domains than that of the British-Scandinavian-Pomeranian Caledonides. The Sudetic Palaeozoic sequences most probably developed on Armorican Neoproterozoic crust and in adjacent oceanic(?) domains and, therefore, the Sudetes form part of the Variscan orogenic belt.

scholarly journals Geochronology, geochemistry and tectonic implications of early Carboniferous plutons in the southwestern Alxa Block

2021 ◽  
pp. 1-17
Author(s):  
Zeng-Zhen Wang ◽  
Xuan-Hua Chen ◽  
Zhao-Gang Shao ◽  
Bing Li ◽  
Hong-Xu Chen ◽  
...  
Keyword(s):  
Alkali Feldspar ◽  
Early Carboniferous ◽  
Sedimentary Deposits ◽  
The North ◽  
Magmatic Rocks ◽  
Central Asian ◽  
Continental Arc ◽  
Isotopic Analyses ◽  
Western Segment ◽  
Extensional Setting

Abstract The southeastern Central Asian Orogenic Belt (CAOB) records the assembly process between several micro-continental blocks and the North China Craton (NCC), with the consumption of the Paleo-Asian Ocean (PAO), but whether the S-wards subduction of the PAO beneath the northern NCC was ongoing during Carboniferous–Permian time is still being debated. A key issue to resolve this controversy is whether the Carboniferous magmatism in the northern NCC was continental arc magmatism. The Alxa Block is the western segment of the northern NCC and contiguous to the southeastern CAOB, and their Carboniferous–Permian magmatism could have occurred in similar tectonic settings. In this contribution, new zircon U–Pb ages, elemental geochemistry and Sr–Nd isotopic analyses are presented for three early Carboniferous granitic plutons in the southwestern Alxa Block. Two newly identified aluminous A-type granites, an alkali-feldspar granite (331.6 ± 1.6 Ma) and a monzogranite (331.8 ± 1.7 Ma), exhibit juvenile and radiogenic Sr–Nd isotopic features, respectively. Although a granodiorite (326.2 ± 6.6 Ma) is characterized by high Sr/Y ratios (97.4–139.9), which is generally treated as an adikitic feature, this sample has highly radiogenic Sr–Nd isotopes and displays significantly higher K2O/Na2O ratios than typical adakites. These three granites were probably derived from the partial melting of Precambrian continental crustal sources heated by upwelling asthenosphere in lithospheric extensional setting. Regionally, both the Alxa Block and the southeastern CAOB are characterized by the formation of early Carboniferous extension-related magmatic rocks but lack coeval sedimentary deposits, suggesting a uniform lithospheric extensional setting rather than a simple continental arc.

New early griffenfly, Sinomeganeura huangheensis from the Late Carboniferous of northern China (Meganisoptera: Meganeuridae)

2008 ◽  
Vol 39 (2) ◽  
pp. 223-229 ◽  
Author(s):  
Dong Ren ◽  
André Nel ◽  
Jakub Prokop
Keyword(s):  
Northern China ◽  
Early Carboniferous ◽  
Late Paleozoic ◽  
Wing Venation ◽  
Large Species ◽  
Late Permian ◽  
Venation Pattern ◽  
Upper Carboniferous ◽  
Flying Insects ◽  
Ningxia Hui Autonomous Region

AbstractNew griffenfly Sinomeganeura huangheensis gen. n., sp. n. (Meganeuridae) is described from Upper Carboniferous (Namurian) of the Tupo Formation in northern China (Ningxia Hui Autonomous Region). This taxon exhibits unique structure of the wing venation pattern. It is highly interesting in reference to the Namurian age known for the occurrence of two meganeurids until present (Namurotypus Brauckmann & Zessin, 1989 and Shenzhousia Zhang & Hong, 2006) as well as the palaeogeographical position of the locality far from all sites in Laurussia. We demonstrate that meganeurids with relatively small wings already co-existed with large species in the Namurian, as for the Stephanian and the Late Permian. Thus, Sinomeganeura demonstrates that the meganeurid diversity and wing venation disparity were comparable during the Namurian and the Stephanian, suggesting that this group already had a long history in the Early Carboniferous. Odonatoptera were probably the main, if not unique predators of the flying insects during the Late Paleozoic.

Sign in / Sign up

Export Citation Format

Share Document