The history of denudation and resedimentation at the continental margin of western Dronning Maud Land, Antarctica, during break-up of Gondwana

Jacobs, Joachim; Kaul, Norbert E; Weber, Klaus

doi:10.1144/gsl.sp.1996.108.01.14

Cited by 6 publications

(6 citation statements)

References 21 publications

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“…3). This assumption is in agreement with Jacobs et al (1996), who suggested that the continental crust of western DML was heated by regional melts that formed from around 180 Ma until the Early Cretaceous (140 Ma) when the lava pile they produced was eroded again. The scenario is in support of the presence of two sequences of SDRs (Fig.…”

Section: Indications Of Potential Ventingsupporting

confidence: 91%

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Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Huang

Jokat

2016

Mar Geophys Res

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The relief of Dronning Maud Land (DML), formed by Middle and Late Mesozoic tectonic activity, had a strong spatial control on the early fluvial and subsequent glacial erosion and deposition. The sources, processes, and products of sedimentation along the DML margin and in the Lazarev Sea in front of the DML mountains have been barely studied. The onshore mountain belt parallel to the coast of the DML margin acts as a barrier to the transport of terrigenous sediments from the east Antarctic interior to the margin and into the Lazarev Sea. Only the Jutul-Penck Graben system allows a localized ice stream controlled transport of material from the interior of DML across its old mountain belt. Offshore, we attribute repeated largescale debris flow deposits to instability of sediments deposited locally on the steep gradient of the DML margin by high sediment flux. Two types of canyons are defined based on their axial dimensions and originated from turbidity currents and slope failures during glacial/fluvial transport. For the first time, we report pipe-like seismic structures in this region and suggest that they occurred as consequences of volcanic processes. Sedimentary processes on the DML margin were studied using seismic reflection data and we restricted the seismic interpretation to the identification of major seismic sequences and their basal unconformities.

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Section: Indications Of Potential Ventingsupporting

confidence: 91%

“…The continental margins of East Antarctica and East Africa experienced massive rift related volcanism (Jacobs et al 1996). This volcanism is thought to have been caused by lithospheric extension above a mantle plume (White and McKenzie 1989).…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Huang

Jokat

2016

Mar Geophys Res

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“…A strong positive magnetic anomaly off the Explora Wedge at 70°S, 12°W marks the boundary between transitional and oceanic crust. From seismic reflection data it is known that the Explora Wedge is build up by volcanic seaward dipping units formed shortly before breakup [Hinz and Kristoffersen, 1987;Jacobs et al, 1996].…”

Section: Antarctic-south American Sectormentioning

confidence: 99%

“…In DML only a few volcanic rocks with an age of 190 Myr were found in the Vestfjella [Peters, 1989]. That a thermal event influenced the tectonic evolution of DML is suggested by apatite fission track analysis [Jacobs et al, 1996]. The apatite fission track data show that the onset of tectonically induced denudation causing basement cooling started no earlier than circa 140 Ma.…”

Section: Epmmentioning

confidence: 99%

Timing and geometry of early Gondwana breakup

et al. 2003

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[1] The Mesozoic opening history of the Southern Ocean between South America, Africa, and Antarctica is one of the largest gaps in knowledge on the evolution of this region. Competing geodynamic models were published during the last two decades to explain the geophysical and geological observations. Here we report on aeromagnetic data collected along the East Antarctic coast during five seasons. These data provide new constraints on the timing and geometry of the early Gondwana breakup. In the Riiser-Larsen Sea/ Mozambique Basin, the first oceanic crust between Africa and Antarctica formed around 155 Ma. In the west the Weddell Rift propagated from west to east with a velocity of 63 km/Myr between chrons M19N and M17N. At chron M14N, South America and Africa finally were split off the Antarctic continent. Stretching in the area of the South Atlantic started at the latest from 155 Myr onward. The different spreading velocities and directions of South America and Africa created at chron M9N the first oceanic crust in the South Atlantic. A new model indicates that the Karoo and Dronning Maud Land magmatism occurred well before any new ocean floor was created and therefore the first formation of new oceanic crust cannot directly be related to a plume interaction.

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“…Anderson et al (1991) conclude that besides reflecting the exposed geology of the hinterland, the "pebbles, sand-sized minerals, and recycled palynomorphs [see below] suggest that sedimentary basins containing Late Jurassic-Late Cretaceous sedimentary deposits are situated beneath the East Antarctic ice sheet and on the adjacent continental shelf [sic]." The shelf off western Dronning Maud Land actually extends to depths of 500 m and 1000 m, and is part of a mid-slope submarine plateau (Jacobs et al, 1996). The suggested "continental shelf" is confirmed as a proximal source from the finding of in situ Early Cretaceous black shale in ODP 692 and 693 (Mohr, 1990;O'Connell, 1990), so eliminating "beneath the East Antarctic ice sheet" as provenance.…”

Section: Brunt Ice Shelf (K-k′) Crary Trough (J″-k) and Weddell Seamentioning

confidence: 99%

Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land–Antarctic Peninsula–Weddell Sea–Dronning Maud Land sector (240°E–0°–015°E)

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Saeed

2013

Gondwana Research

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The history of denudation and resedimentation at the continental margin of western Dronning Maud Land, Antarctica, during break-up of Gondwana

Abstract: A c.

Cited by 6 publications

References 21 publications

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Timing and geometry of early Gondwana breakup

Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land–Antarctic Peninsula–Weddell Sea–Dronning Maud Land sector (240°E–0°–015°E)

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