scholarly journals Mantle Rock Exhumation at Saint Peter and Saint Paul Islets, Equatorial Atlantic Ocean, and its Implication to Possible Generation of Abiogenic Hydrocarbons by Serpentinization

2015 ◽  
Vol 38 (1) ◽  
pp. 05
Author(s):  
A. MOTOKI ◽  
S. E. SICHEL ◽  
T. THAIS VARGAS ◽  
P. PETER SZATMARI ◽  
A. N. SIAL ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Saint Paul ◽  
Mantle Rock ◽  
Equatorial Atlantic ◽  
Equatorial Atlantic Ocean ◽  
Saint Peter

scholarly journals Gravimetric structure for the abyssal mantle massif of Saint Peter and Saint Paul peridotite ridge, Equatorial Atlantic Ocean, and its relation to active uplift

2014 ◽  
Vol 86 (2) ◽  
pp. 571-588 ◽  
Author(s):  
KENJI F. MOTOKI ◽  
AKIHISA MOTOKI ◽  
SUSANNA E. SICHEL
Keyword(s):  
Atlantic Ocean ◽  
Saint Paul ◽  
Tectonic Uplift ◽  
Plate Motion ◽  
Ultramafic Rocks ◽  
Transform Fault ◽  
Equatorial Atlantic ◽  
Data Set ◽  
Equatorial Atlantic Ocean ◽  
Saint Peter

This paper presents gravimetric and morphologic analyses based on the satellite-derived data set of EGM2008 and TOPEX for the area of the oceanic mantle massif of the Saint Peter and Saint Paul peridotite ridge, Equatorial Atlantic Ocean. The free-air anomaly indicates that the present plate boundary is not situated along the longitudinal graben which cuts peridotite ridge, but about 20 km to the north of it. The high Bouguer anomaly of the peridotite ridge suggests that it is constituted mainly by unserpentinised ultramafic rocks. The absence of isostatic compensation and low-degree serpentinisation of the ultramafic rocks indicate that the peridotite ridge is sustained mainly by active tectonic uplift. The unparallel relation between the transform fault and the relative plate motion generates near north-south compression and the consequent tectonic uplift. In this sense, the peridotite massif is a pressure ridge due to the strike-slip displacement of the Saint Paul Transform Fault.

A vagrant Black-headed Gull (Chroicocephalus ridibundus) documented from Saint Peter and Saint Paul Archipelago: Brazil’s first record

2020 ◽  
Vol 28 (4) ◽  
pp. 263-266
Author(s):  
Antônio Coimbra de Brum ◽  
Renata Brentano ◽  
Rosalinda Carmela Montone ◽  
Maria Virginia Petry
Keyword(s):  
Atlantic Ocean ◽  
Saint Paul ◽  
First Record ◽  
Breeding Population ◽  
Intertropical Convergence Zone ◽  
Equatorial Atlantic ◽  
Trade Winds ◽  
Equatorial Atlantic Ocean ◽  
Palearctic Species ◽  
Saint Peter

AbstractWe report the sighting of a specimen of Black-headed Gull (Chroicocephalus ridibundus) in Saint Peter and Saint Paul Archipelago (SPSPA), Brazil, in the mid-Atlantic Ocean. Chroicocephalus ridibundus is a Palearctic species that breeds throughout Europe. Part of the population spends winters in the Mediterranean and coasts of Africa, and a small breeding population remains in the northeast coast of North America. The specimen was on the island for 27 days, between 09 February and 06 March 2020. The gull was identified as a first-winter bird based on its plumage. We conclude that the vagrancy of yet another Old World species at the oceanic SPSPA in the western equatorial Atlantic Ocean was caused by the southwesterly trade winds of the Intertropical Convergence Zone. To our knowledge, this is the first documented record of C. ridibundus in the Brazilian territory.

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