Transpressional deformation along the margin of Larsen Basin: new data from Pedersen Nunatak, Antarctic Peninsula

Valle, R.A. del; Miller, Hubert

doi:10.1017/s0954102001000244

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…In its earliest and most simple form, a transform fault zone at the eastern margin of the peninsula would have trended NE, parallel both to the direction of relative plate motion at the time and the margin itself, and would have been active in an overall left-lateral sense. Del Valle & Miller (2001) give structural evidence for mid Cretaceous faults consistent with such a setting in northern Graham Land. Over the next 15 Myr, the South America-Antarctica relative motion vector rotated from NE-SW, via N-S, to NW-SE, requiring the transform zone at the eastern edge of the peninsula to evolve into a continent-ocean collision zone (Fig.…”

Section: Subduction Of South American Seafloor But Survival Of Part Omentioning

confidence: 91%

The age and origin of the central Scotia Sea

Eagles¹

2010

Geophysical Journal International

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SUMMARY Opening of the Drake Passage gateway between the Pacific and Atlantic oceans has been linked in various ways to Cenozoic climate changes. From the oceanic floor of Drake Passage, the largest of the remaining uncertainties in understanding this opening is in the timing and process of the opening of the central Scotia Sea. All but one of the available constraints on the age of the central Scotia Sea is diagnostic of, or consistent with, a Mesozoic age. Comparison of tectonic and magnetic features on the seafloor with plate kinematic models shows that it is likely to have accreted to a mid‐ocean ridge between the South American and Antarctic plates following their separation in Jurassic times. Subsequent regional shallowing may be related to subduction‐related processes that preceded backarc extension in the East Scotia Sea. The presence of a fragment of Jurassic–Cretaceous ocean floor in the gateway implies that deep water connections through the Scotia Sea basin complex may have been possible since Eocene times when the continental tips of South America and the Antarctic Peninsula first passed each other.

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Section: Subduction Of South American Seafloor But Survival Of Part Omentioning

confidence: 91%

The age and origin of the central Scotia Sea

Eagles¹

2010

Geophysical Journal International

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“…From the structural point of view, the study area is located to the N of an important lefthanded passing fault zone, located c. 25-35 km SE of the eastern coast of the Cerro Nevado and Marambio islands (Sloan et al 1995, del Valle & Miller 2001. This fracture zone is parallel to the eastern edge of the Antarctic peninsula and its origin is attributed to tectonic movements that probably occurred during the Oligocene (Sloan et al 1995).…”

Section: )mentioning

confidence: 99%

Submarine Accumulations of Methane Hydrates in Adjacences of Seymour Island (Isla Marambio), Antarctica and Its Probable Environmental Incident

Valle

Granel

2022

Preprint

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The presence of aliphatic hydrocarbons in sediments at the bottom of the platform and the continental margin of the northeastern tip of the Antarctic Peninsula and its natural escapes, leads us to infer about the likely effects they may have on the Antarctic environment, particularly on changes off average in surface temperatures and seawater. Methane leaks recorded in shallow waters of the region are compatible with the destabilization of gas hydrates in the marine substrate and with changes in average surface temperatures and seawater, suggesting a probable environmental impact such as As a consequence of this process, based on the hypothesis of the "clathrate rifle", the scientific theory of Gerry Dickens and James Kennet, which argues that the rise in sea temperature can lead to a sudden release of methane from the clathrate deposits located in the ocean bottoms, as happened in the Eocene.

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“…The study area, from a structural point of view, is placed to the north of a major counterclockwise strike-slip fault zone, located c. 25-35 km SE of the eastern coast of Snow Hill and Seymour islands [8,9]. This fracture zone is parallel to the eastern edge of Antarctic Peninsula and its origin is assigned to tectonic movements which probably occurred during the Oligocene [8].…”

Section: Working Areamentioning

confidence: 99%

Methane at the NW of Weddell Sea, Antarctica

Valle

Yermolin

Chiarandini³

et al. 2017

Journal of Geological Research

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The presence of gaseous hydrocarbons (from methane to n-pentane) in the seabed sediments and the bubbling of methane may suggest the presence of gas accumulations in the substrate of the NW Weddell Sea, Antarctica. The release of methane from the frozen ocean substrate adjacent to Seymour Island would be linked to climate instability during Late Cenozoic, when vast areas of the Antarctic continental shelf were flooded during the marine transgression that occurred . 18,000 years ago, after the Last Glacial Maximum (LGM). As the ice melted, the sea again occupied the regions which it had abandoned. As the transgression was relatively rapid, the sub-air relief was not destroyed but was submerged and the ground had frozen (permafrost) along with it. Thus, the heat flow from the sea to the marine substrate, now flooded, would have destabilized frozen gas accumulations, which were originally formed into terrestrial permafrost during the LGM, similarly to what would have happened in the Arctic.

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Transpressional deformation along the margin of Larsen Basin: new data from Pedersen Nunatak, Antarctic Peninsula

Cited by 6 publications

References 6 publications

The age and origin of the central Scotia Sea

The age and origin of the central Scotia Sea

Submarine Accumulations of Methane Hydrates in Adjacences of Seymour Island (Isla Marambio), Antarctica and Its Probable Environmental Incident

Methane at the NW of Weddell Sea, Antarctica

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