Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau

Chemale, Farid; Ramos, Víctor A.; Naipauer, Maximiliano; Girelli, Tiago Jonatan; Vargas, Mateus Rodrigues de

doi:10.1016/j.precamres.2018.05.026

Cited by 23 publications

(5 citation statements)

References 40 publications

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“…Marine sedimentation since at least the Mid-to-Late Jurassic boundary is recorded in DSDP-511 well on the Maurice Ewing Bank (Price and Gröcke, 2002). Barker (1999) and recently Schimschal and Jokat (2019) proved the presence of oceanic crust under the plateau, although other authors suggest highly-extended continental crust (Chemale et al, 2018;Kimbell and Richards, 2008). Fraticelli et al (2016) mention the development of two main sedimentary troughs east from the islands: the Fitz Roy and Volunteer basins (Fig.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…The Malvinas (Falkland) Plateau is a projection to the east of the Argentinean continental shelf that extends between the Malvinas (Falkland) Islands and the J o u r n a l P r e -p r o o f Maurice Ewing Bank (Ewing et al, 1971;Chemale et al, 2018). The plateau limits to the south with the Scotia oceanic plate (via a transpressive margin) and is bounded to the north by the Agulhas-Malvinas (Falkland) Fracture Zone (AMFZ).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

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Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

Lovecchio¹,

Rohais

Joseph

et al. 2020

Earth-Science Reviews

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Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

Lovecchio¹,

Rohais

Joseph

et al. 2020

Earth-Science Reviews

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“…From that perspective, Mesoproterozoic Grenvillian sources could correspond to granites and gneisses of the Cabo Belgrano Complex, which are cropping out in the Malvinas islands ( Fig. 3b; Cingolani and Varela, 1976;Rex and Tanner, 1982;Thomas et al, 2000) and possibly in the neighboring Argentinean Atlantic platform (Wareham et al, 1998;Chemale Jr. et al, 2018).…”

Section: Provenance Sources and Paleogeographic Implicationsmentioning

confidence: 99%

The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection

Suárez

Ghiglione

Calderón

et al. 2019

Journal of South American Earth Sciences

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The Nunatak Viedma within the Southern Patagonian Icefield has been considered as a volcanic center based on its geomorphologic features, despite the fact that field explorations by Eric Shipton determined its metamorphic nature 70 years ago. We carried out fieldwork to characterize this isolated outcrop and performed the first U-Pb dating in detrital zircons from the basement rocks located inside the Southern Patagonian Icefield. We recognized very-low grade metamorphic rocks, corresponding principally to metapelites and metapsammites, and scarce metabasites. Detrital zircons in three metapsammitic samples (composite group of 240 grains) yielded prominent age population peaks at ~1090, ~960, ~630, ~520, ~480-460, ~380, ~290-260, ~235-225 Ma that are typical of Gondwanide affinity, and youngest grains at ~208 Ma. Maximum depositional ages of 225, 223 and 212 Ma were calculated for each sample from the youngest cluster of ages. This distinctive and novelty Late Triassic age justifies differentiate the Nunatak Viedma Unit from the Devonian-early Carboniferous and Permian-Early Triassic (?) belts of the Eastern Andean Metamorphic Complex. Possible primary source areas for the detrital zircons are outcropping in southern Patagonia, the Antarctic Peninsula, and the Malvinas Islands. Additionally, secondary sources could be part of the erosion and recycling of metasediments from the Eastern Andean Metamorphic Complex. We propose that the cluster of Triassic ages is related to the volcanic arc emplaced along the Antarctic Peninsula and active at that timewhen was still attached to southern Patagonia during the Triassic. The dynamics of the early Mesozoic orogen is also discussed.

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“…The cored granites and gneisses are comparable with the ones cropping out in the western part of the Falkland Plateau, onshore the Falkland Islands at Cape Meredith (Beckinsale et al, 1977; Tarney, 1977; Figure 1b), suggesting that the islands and the Maurice Ewing Bank originated from a continuous continental block that underwent extension and/or potential break‐up during the fragmentation of Gondwana. This is supported by geochemical and isotopic analyses of their basement lithologies (Chemale et al, 2018).…”

Section: Geological Backgroundmentioning

confidence: 74%

The heterogeneous crustal architecture of the Falkland Plateau Basin

et al. 2023

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Continental break‐up can be oftentimes associated with intracontinental wrenching that can lead to the generation of transform margins and transform marginal plateaus. The wrenching phase can be accompanied by complicated processes, which result in heterogeneous structural and crustal architectures. This makes understanding the evolution of such tectonic settings challenging. The Falkland Plateau is an example of a transform marginal plateau where regional wrenching accompanied the incipient stages of Gondwanan continental break‐up to result in a mosaic of crustal types underlying its largest basin: the Falkland Plateau Basin (FPB). The uncertainties in crustal boundaries have led to several models for the evolution of the plateau, which hinder the development of a reliable plate reconstruction of Southern Gondwana. We integrate seismic reflection, gravity and magnetic data to propose an updated crustal architecture of the FPB. The results show that extended continental crust underlies the basin in the west and north. The eastern and central parts consist of a juxtaposition of intruded and underplated continental crust which transitions southwards to a thick oceanic domain. The basin is crosscut by three main NE–SW trending shear zones which facilitated the development of the contrasting crustal and structural domains interpreted across the plateau. This integrated reassessment of the FPB provides new insights into the tectonic evolution of the plateau, the deformation associated with wrenching and transform margin formation and our understanding of the tectono‐stratigraphic evolution of such areas.

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Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau

Cited by 23 publications

References 40 publications

Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

Mesozoic rifting evolution of SW Gondwana: A poly-phased, subduction-related, extensional history responsible for basin formation along the Argentinean Atlantic margin

The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection

The heterogeneous crustal architecture of the Falkland Plateau Basin

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