Hydraulic Continuation of the Abyssal Flow From the Vema Channel in the Southwestern Part of the Brazil Basin

2020 ◽  
Vol 125 (6) ◽  
Author(s):  
Roman Y. Tarakanov ◽  
Eugene G. Morozov ◽  
Dmitry I. Frey
Keyword(s):  
Southwestern Part ◽  
Brazil Basin

scholarly journals Statherian (ca. 1714–1680 Ma) Extension-Related Magmatism and Deformation in the Southwestern Korean Peninsula and Its Geological Significance: Constraints from the Petrological, Structural, Geochemical and Geochronological Studies of Newly Identified Granitoids

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 557
Author(s):  
Byung-Choon Lee ◽  
Weon-Seo Kee ◽  
Uk-Hwan Byun ◽  
Sung-Won Kim
Keyword(s):  
Korean Peninsula ◽  
Tectonic Setting ◽  
Alkali Feldspar ◽  
Ductile Deformation ◽  
Southwestern Part ◽  
The North ◽  
Deformation Event ◽  
Geochemical Analyses ◽  
A Minor ◽  
T Values

In this study, petrological, structural, geochemical, and geochronological analyses of the Statherian alkali feldspar granite and porphyritic alkali feldspar granite in the southwestern part of the Korean Peninsula were conducted to examine petrogenesis of the granitoids and their tectonic setting. Zircon U-Pb dating revealed that the two granites formed around 1.71 Ga and 1.70–1.68 Ga, respectively. The results of the geochemical analyses showed that both of the granites have a high content of K2O, Nb, Ta, and Y, as well as high FeOt/MgO and Ga/Al ratios. Both granites have alkali-calcic characteristics with a ferroan composition, indicating an A-type affinity. Zircon Lu-Hf isotopic compositions yielded negative εHf(t) values (−3.5 to −10.6), indicating a derivation from ancient crustal materials. Both granite types underwent ductile deformation and exhibited a dextral sense of shear with a minor extension component. Based on field relationships and zircon U-Pb dating, it was considered that the deformation event postdated the emplacement of the alkali feldspar granite and terminated soon after the emplacement of the porphyritic alkali feldspar granite in an extensional setting. These data indicated that there were extension-related magmatic activities accompanying ductile deformation in the southwestern part of the Korean Peninsula during 1.71–1.68 Ga. The Statherian extension-related events are well correlated with those in the midwestern part of the Korean and eastern parts of the North China Craton.

Contour current accumulation off the Vema Channel mouth, southern Brazil Basin: pattern of a “contourite fan”

1993 ◽  
Vol 82 (1-4) ◽  
pp. 173-187 ◽  
Author(s):  
M.-Laure Mézerais ◽  
J.-Claude Faugères ◽  
Alberto G. Figueiredo ◽  
Laurent Massé
Keyword(s):  
Southern Brazil ◽  
Brazil Basin

Geochronology and Geodynamic Settings of Metamorphic Complexes in the Southwestern Part of the Tuva-Mongolian Terrane, Central Asian Foldbelt

2021 ◽  
Vol 29 (4) ◽  
pp. 389-410
Author(s):  
I. K. Kozakov ◽  
V. P. Kovach ◽  
E. B. Salnikova ◽  
A. Kröner ◽  
E. V. Adamskaya ◽  
...  
Keyword(s):  
Southwestern Part ◽  
Geodynamic Settings ◽  
Central Asian ◽  
Metamorphic Complexes
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