Aeromagnetic exploration over the East Antarctic Ice Sheet: A new view of the Wilkes Subglacial Basin

Ferraccioli, Fausto; Armadillo, Egidio; Jordan, Tom A.; Bozzo, E.; Corr, Hugh

doi:10.1016/j.tecto.2009.03.013

Cited by 127 publications

(221 citation statements)

References 62 publications

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“…These highs are associated with dikes and sills of the Jurassic Ferrar diabase with measured susceptibilities ≤8 × 10 −3 SI ( Figure 4b) and typical of their magnetic signature throughout the TAM [Damaske and Finn, 1996;Ferraccioli and Bozzo, 1999;Finn et al, 2006;Studinger et al, 2004Studinger et al, , 2006. The broad semicircular ∼150 nT high at the southern end of unit 3 may correspond to thick sequences of Ferrar dolerites similar to those inferred from aeromagnetic data to the north [Studinger et al, 2004;Ferraccioli et al, 2009;Finn et al, 1999].…”

Section: Magnetic Features Correlated With Geologic Exposurementioning

confidence: 68%

“…Gneisses and schists of the reworked Nimrod Group produce the observed magnetic anomalies in the 75-100 km wide modified craton block (2 × 10 −3 SI in all models). Most of the sedimentary and igneous crust in the CTAM profile is assigned a zero susceptibility value, except for the blocks representing Ferrar dolerites with thickness ranging from 1 to 3 km and susceptibilities from 2 to 19 × 10 −3 SI, within the range of measured ( Figure 4b) and modeled values from elsewhere [Ferraccioli et al, 2009;Studinger et al, 2004].…”

Section: Magnetic and Gravity Modelmentioning

confidence: 78%

“…They include Neoproterozoic to lower Paleozoic rift and active margin successions, along with inboard Archean-Proterozoic crystalline rocks of the Nimrod Group immediately to the west [Goodge et al, 1993a[Goodge et al, , 2001Goodge and Fanning, 1999]. A Neoproterozoic rift margin is Antarctic ice sheet and Transantarctic Mountains (blue boxes), from north to south, northern Wilkes Subglacial Basin transect (NWLK [Ferraccioli et al, 2009]), southern Wilkes Subglacial Basin transect (SWLK [Studinger et al, 2004]), CTAM survey (this paper), and South Pole transect (SPT [Studinger et al, 2006]). BEDMAP subice topography base from Lythe et al [2000].…”

Section: Crustal Structure and Magnetic Rock Properties Of The Transamentioning

confidence: 99%

“…A compilation of aeromagnetic surveys in East Antarctica helps to reveal the crustal structure and compositional variation of the present-day Transantarctic mountain range and the ice-covered Precambrian shield (Figures 1a and 9). This compilation consists of aeromagnetic surveys flown prior to 1999, leveled to each other but not to a common elevation [Golynsky et al, 2001]; more recent surveys from the central TAM [Anderson et al, 2006], South Pole [Studinger et al, 2006], Vostok [Studinger et al, 2003], and southern Wilkes Subglacial Basin [Studinger et al, 2004]; an image of recent aeromagnetic data from the northern Wilkes Subglacial Basin [Ferraccioli et al, 2009]; and individual line profiles [Holt et al, 2006]. Because of the lack of continuation to a common elevation above the bed and the different flight line spacings, the amplitudes and wavelengths of anomalies from similar sources can vary from survey to survey.…”

Section: Precambrian Crustal Elements From the Ctam Perspectivementioning

confidence: 99%

“…Because of the lack of continuation to a common elevation above the bed and the different flight line spacings, the amplitudes and wavelengths of anomalies from similar sources can vary from survey to survey. Despite such limitations, all of these data, combined with bed elevation [Ferraccioli et al, 2009;Lythe et al, 2000;Studinger et al, 2004Studinger et al, , 2006 and regional seismic tomography data [Morelli and Danesi, 2004;Ritzwoller et al, 2001], help to resolve critical features of the craton and outboard sequences. In particular, the western limit of the Neoproterozoic rift, and the extent of the Ross Orogen and Jurassic Ferrar dolerites can be mapped in more detail (Figure 9) than previously possible .…”

Section: Precambrian Crustal Elements From the Ctam Perspectivementioning

confidence: 99%

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Glimpses of East Antarctica: Aeromagnetic and satellite magnetic view from the central Transantarctic Mountains of East Antarctica

Goodge

Finn

2010

J. Geophys. Res.

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[1] Aeromagnetic and satellite magnetic data provide glimpses of the crustal architecture within the Ross Sea sector of the enigmatic, ice-covered East Antarctic shield critical for understanding both global tectonic and climate history. In the central Transantarctic Mountains (CTAM), exposures of Precambrian basement, coupled with new high-resolution magnetic data, other recent aeromagnetic transects, and satellite magnetic and seismic tomography data, show that the shield in this region comprises an Archean craton modified both by Proterozoic magmatism and early Paleozoic orogenic basement reactivation. CTAM basement structures linked to the Ross Orogeny are imaged 50-100 km farther west than previously mapped, bounded by inboard upper crustal Proterozoic granites of the Nimrod igneous province. Magnetic contrasts between craton and rift margin sediments define the Neoproterozoic rift margin, likely reactivated during Ross orogenesis and Jurassic extension. Interpretation of satellite magnetic and aeromagnetic patterns suggests that the Neoproterozoic rift margin of East Antarctica is offset by transfer zones to form a stepwise series of salients tracing from the CTAM northward through the western margin of the Wilkes Subglacial Basin to the coast at Terre Adélie. Thinned Precambrian crust inferred to lie east of the rift margin cannot be imaged magnetically because of modification by Neoproterozoic and younger tectonic events.

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Section: Magnetic Features Correlated With Geologic Exposurementioning

confidence: 68%

Section: Magnetic and Gravity Modelmentioning

confidence: 78%

Section: Crustal Structure and Magnetic Rock Properties Of The Transamentioning

confidence: 99%

Section: Precambrian Crustal Elements From the Ctam Perspectivementioning

confidence: 99%

Section: Precambrian Crustal Elements From the Ctam Perspectivementioning

confidence: 99%

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Glimpses of East Antarctica: Aeromagnetic and satellite magnetic view from the central Transantarctic Mountains of East Antarctica

Goodge

Finn

2010

J. Geophys. Res.

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The subglacial geology of Wilkes Land, East Antarctica

Aitken

Young

Ferraccioli

et al. 2014

Geophysical Research Letters

148

222

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Wilkes Land is a key region for studying the configuration of Gondwana and for appreciating the role of tectonic boundary conditions on East Antarctic Ice Sheet (EAIS) behavior. Despite this importance, it remains one of the largest regions on Earth where we lack a basic knowledge of geology. New magnetic, gravity, and subglacial topography data allow the region's first comprehensive geological interpretation. We map lithospheric domains and their bounding faults, including the suture between Indo-Antarctica and Australo-Antarctica. Furthermore, we image subglacial sedimentary basins, including the Aurora and Knox Subglacial Basins and the previously unknown Sabrina Subglacial Basin. Commonality of structure in magnetic, gravity, and topography data suggest that pre-EAIS tectonic features are a primary control on subglacial topography. The preservation of this relationship after glaciation suggests that these tectonic features provide topographic and basal boundary conditions that have strongly influenced the structure and evolution of the EAIS.

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Potential groundwater and heterogeneous heat source contributions to ice sheet dynamics in critical submarine basins of East Antarctica

Gooch

Young

Blankenship

2016

Geochem Geophys Geosyst

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We present the results of two numerical models describing contributions of groundwater and heterogeneous heat sources to ice dynamics directly relevant to basal processes in East Antarctica. A two‐phase, one‐dimensional hydrothermal model demonstrates the importance of groundwater flow in vertical heat flux advection near the ice‐bed interface. Typical, conservative vertical components of groundwater volume fluxes (from either topographical gradients or vertically channeled flow) on the order of ±1–10 mm/yr can alter vertical heat flux by ±50–500 mW/m2 given parameters typical for the interior of East Antarctica. This heat flux has the potential to produce considerable volumes of meltwater depending on basin geometry and geothermal heat production. A one‐dimensional hydromechanical model demonstrates that groundwater is mainly recharged into saturated, partially poroelastic (i.e., vertical stress only; not coupled to a deformation equation) sedimentary aquifers during ice advance. During ice retreat, groundwater discharges into the ice‐bed interface, which may contribute to water budgets on the order of 0.1–1 mm/yr. We also present an estimated map of potentially heterogeneous heat flow provinces using radiogenic heat production data from East Antarctica and southern Australia, calculated sedimentary basin depths, and radar‐derived bed roughness. These are overlaid together to delineate the areas of greatest potential effect from these modeled processes on the ice sheet dynamics of the East Antarctic Ice Sheet.

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Aeromagnetic exploration over the East Antarctic Ice Sheet: A new view of the Wilkes Subglacial Basin

Cited by 127 publications

References 62 publications

Glimpses of East Antarctica: Aeromagnetic and satellite magnetic view from the central Transantarctic Mountains of East Antarctica

Glimpses of East Antarctica: Aeromagnetic and satellite magnetic view from the central Transantarctic Mountains of East Antarctica

The subglacial geology of Wilkes Land, East Antarctica

Potential groundwater and heterogeneous heat source contributions to ice sheet dynamics in critical submarine basins of East Antarctica

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