Genesis and evolution of a Paleoproterozoic basement inlier within West Gondwana addressed by Sm-Nd isotopic geochemistry and Zr saturation thermometry

2017 ◽  
Vol 80 ◽  
pp. 95-106 ◽  
Author(s):  
Claudia Sayão Valladares ◽  
Beatriz Paschoal Duarte ◽  
Hugo Tavares Machado ◽  
Samuel Magalhães Viana ◽  
Pedro Lontra Costa de Figueiredo
Keyword(s):  
West Gondwana ◽  
Isotopic Geochemistry ◽  
Basement Inlier

Elemental and isotopic geochemistry of nonhydrated quartz latite glasses from the Eureka Valley Tuff, east-central California

1976 ◽  
Vol 87 (5) ◽  
pp. 754 ◽  
Author(s):  
DONALD C. NOBLE ◽  
MARJORIE K. KORRINGA ◽  
S. E. CHURCH ◽  
HARRY R. BOWMAN ◽  
MILES L. SILBERMAN ◽  
...  
Keyword(s):  
East Central ◽  
Central California ◽  
Isotopic Geochemistry

scholarly journals The Souss lagerstätte of the Anti-Atlas, Morocco: discovery of the first Cambrian fossil lagerstätte from Africa

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gerd Geyer ◽  
Ed Landing
Keyword(s):  
South China ◽  
Lower Cambrian ◽  
Northern Slope ◽  
Sea Floor ◽  
Upper Cambrian ◽  
Exceptional Preservation ◽  
West Gondwana ◽  
Regional Correlation ◽  
Animal Remains ◽  
Stratigraphic Interval

AbstractEpisodic low oxygenated conditions on the sea-floor are likely responsible for exceptional preservation of animal remains in the upper Amouslek Formation (lower Cambrian, Stage 3) on the northern slope of the western Anti-Atlas, Morocco. This stratigraphic interval has yielded trilobite, brachiopod, and hyolith fossils with preserved soft parts, including some of the oldest known trilobite guts. The “Souss fossil lagerstätte” (newly proposed designation) represents the first Cambrian fossil lagerstätte in Cambrian strata known from Africa and is one of the oldest trilobite-bearing fossil lagerstätten on Earth. Inter-regional correlation of the Souss fossil lagerstätte in West Gondwana suggests its development during an interval of high eustatic levels recorded by dark shales that occur in informal upper Cambrian Series 2 in Siberia, South China, and East Gondwana.

scholarly journals Magmatic flare-up causes crustal thickening at the transition from subduction to continental collision

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Carlos E. Ganade ◽  
Pierre Lanari ◽  
Daniela Rubatto ◽  
Joerg Hermann ◽  
Roberto F. Weinberg ◽  
...  
Keyword(s):  
Production Rate ◽  
Continental Margin ◽  
Subduction Zones ◽  
Continental Collision ◽  
Crustal Thickening ◽  
Time Intervals ◽  
West Gondwana ◽  
Continental Arc ◽  
Order Of Magnitude

AbstractAbove subduction zones, magma production rate and crustal generation can increase by an order of magnitude during narrow time intervals known as magmatic flare-ups. However, the consequences of these events in the deep arc environment remain poorly understood. Here we use petrological and in-situ zircon dating techniques to investigate the root of a continental arc within the collisional West Gondwana Orogen that is now exposed in the Kabyé Massif, Togo. We show that gabbros intruded 670 million years ago at 20–25 km depth were transformed to eclogites by 620 million years ago at 65–70 km depth. This was coeval with extensive magmatism at 20–40 km depth, indicative of a flare-up event which peaked just prior to the subduction of the continental margin. We propose that increased H2O flux from subduction of serpentinized mantle in the hyper-extended margin of the approaching continent was responsible for the increased magma productivity and crustal thickening.

scholarly journals The Tonian Embu Complex in the Ribeira Belt (Brazil): revision, depositional age and setting in Rodinia and West Gondwana

2019 ◽  
Vol 320 ◽  
pp. 31-45 ◽  
Author(s):  
G.A.C. Campanha ◽  
F.M. Faleiros ◽  
P.A. Cawood ◽  
D.I.G. Cabrita ◽  
B.V. Ribeiro ◽  
...  
Keyword(s):  
West Gondwana ◽  
Depositional Age

Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation

2019 ◽  
Vol 322 ◽  
pp. 99-121 ◽  
Author(s):  
L.V. Warren ◽  
B.T. Freitas ◽  
C. Riccomini ◽  
P.C. Boggiani ◽  
F. Quaglio ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
West Gondwana ◽  
Sedimentary Evolution ◽  
Break Up

The Neoproterozoic southern passive margin of the São Francisco craton: Insights on the pre-amalgamation of West Gondwana from U-Pb and Hf-Nd isotopes

2019 ◽  
Vol 320 ◽  
pp. 454-471 ◽  
Author(s):  
Alice Westin ◽  
Mario C. Campos Neto ◽  
Peter A. Cawood ◽  
Chris J. Hawkesworth ◽  
Bruno Dhuime ◽  
...  
Keyword(s):  
Passive Margin ◽  
Nd Isotopes ◽  
West Gondwana
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