Aeromagnetic and gravity data over the Central Transantarctic Mountains (CTAM), Antarctica: a website for the distribution of data and maps

Anderson, Eric D.; Finn, C.; Damaske, Detlef; Abraham, J. D.; Goldmann, F.; Goodge, John W.; Braddock, P.

doi:10.3133/ofr20061255

Cited by 4 publications

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“…line km of total-field magnetic data were flown in [2003][2004], covering an area of nearly 60,000 km at an average altitude of 600 m above the ice (Figure 6) [Anderson et al, 2006]. The lines were flown east-west with a line spacing of 2.5 km over most areas and 1.25 km over exposed basement rocks in the Miller and Geologists ranges with north-south trending tie lines at 25 km intervals (Figures 2 and 7a).…”

Section: Aeromagnetic Data Acquisition and Processingmentioning

confidence: 99%

“…[17] In addition to the aeromagnetic data, 42 gravity stations were collected on the ground along a profile from near the Ross Ice Shelf to beyond the Miller Range and were corrected to free-air values [Anderson et al, 2006] (Figures 7b and 8). Lacking ice thickness measurements, it was not possible to make Bouguer anomaly calculations.…”

Section: Gravity Measurementsmentioning

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%

“…All data were collected in field from unweathered outcrop, except for Jurassic Ferrar dolerite (data obtained from the U.S. Polar Rock Repository, Ohio State University, based on samples from the Queen Alexandra Range adjacent to aeromagnetic survey area). line km of total-field magnetic data were flown in 2003-2004, covering an area of nearly 60,000 km at an average altitude of 600 m above the ice ( Figure 6) [Anderson et al, 2006]. The lines were flown east-west with a line spacing of 2.5 km over most areas and 1.25 km over exposed basement rocks in the Miller and Geologists ranges with north-south trending tie lines at 25 km intervals (Figures 2 and 7a).…”

Section: Aeromagnetic Data Acquisition and Processingmentioning

confidence: 99%

“…Magnetic map of part of East Antarctica, showing aeromagnetic transect and line data [Golynsky et al, 2001;Holt et al, 2006;Studinger et al, 2003] superimposed on satellite magnetic data downward continued to the geoid [Maus et al, 2008]. Transect data include, from north to south, Oates Coast (OAT ); an image from northern Wilkes Land to which the color legend does not correspond (NWLK [Ferraccioli et al, 2009]); southern Wilkes Land (SWLK [Studinger et al, 2004]); central Transantarctic Mountains (CTAM [this study; Anderson et al, 2006]); South Pole transect (SPT [Studinger et al, 2006]). Tectonic boundaries inferred from geology, magnetic, topographic, and seismic data include (1) craton edge corresponding to Neoproterozoic rift boundary and coincident limit of Ross and Ferrar magmas (red, shown as solid line through aeromagnetic and topography data, dashed over satellite magnetic data); (2) edge of undeformed craton and inner limit of Ross basement deformation (white); (3) offset of cratonic magnetic boundary (violet, Mulock-Byrd transfer zone, corresponding to rift margin structure proposed by Wilson [1993]); and (4) transition from fast (>5%) mantle shear wave velocity perturbations (beneath East Antarctic craton) to slow (<2%) velocity perturbations from seismic tomography models (blue dashed line [Ritzwoller et al, 2001] terozoic blocks with faulted western margins and eastern margins unconformably overlain by Neoproterozic rift sediments (Adelaidean) were deformed by the Ross-equivalent Delamerian Orogeny [Drexel et al, 1993;Flöttmann et al, 1993;Williams et al, 2009a].…”

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: Aeromagnetic Data Acquisition and Processingmentioning

confidence: 99%

Section: Gravity Measurementsmentioning

confidence: 99%

Section: Precambrian Crustal Elements From the Ctam Perspectivementioning

confidence: 99%

Section: Aeromagnetic Data Acquisition and Processingmentioning

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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Air and shipborne magnetic surveys of the Antarctic into the 21st century

et al. 2013

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The Antarctic geomagnetics' community remains very active in crustal anomaly mapping. More than 1.5 million line-km of new air-and shipborne data have been acquired over the past decade by the international community in Antarctica. These new data together with surveys that previously were not in the public domain significantly upgrade the ADMAP compilation. Aeromagnetic flights over East Antarctica have been concentrated in the Transantarctic Mountains, the Prince Charles Mountains-Lambert Glacier area, and western Dronning Maud Land (DML)-Coats Land. Additionally, surveys were conducted over Lake Vostok and the western part of Marie Byrd Land by the US Support Office for Aerogeophysical Research projects and over the Amundsen Sea Embayment during the austral summer of 2004/2005 by a collaborative US/UK aerogeophysical campaign. New aeromagnetic data over the Gamburtsev Subglacial Mountains (120,000 line-km), acquired within the IPY Antarctica's Gamburtsev Province project reveal fundamental geologic features beneath the East Antarctic Ice sheet critical to understanding Precambrian continental growth processes. Roughly 100,000 line-km of magnetic data obtained within the International Collaboration for Exploration of the Cryosphere through Aerogeophysical Profiling promises to shed light on subglacial lithology and identify crustal boundaries for the central Antarctic Plate. Since the 1996/97 season, the Alfred Wegener Institute has collected 90,000 km of aeromagnetic data along a 1200 km long segment of the East Antarctic coast over western DML. Recent cruises by Australian, German, Japanese, Russian, British, and American researchers have contributed to long-standing studies of the Antarctic continental margin. Along the continental margin of East Antarctica west of Maud Rise to the George V Coast of Victoria Land, the Russian Polar Marine Geological Research Expedition and Geoscience Australia obtained 80,000 and 20,000 line-km, respectively, of integrated seismic, gravity and magnetic data. Additionally, US expeditions collected 128,000 line-km of shipborne magnetic data in the Ross Sea sector.

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Compiling ship and airborne measurements for the Antarctic's second-generation magnetic anomaly map

Golynsky

Frese³

2022

Russian Journal of Earth Sciences

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In 2001, the Antarctic Digital Magnetic Anomaly Project produced the ADMAP-1 compilation that included the first magnetic anomaly map of the region south of 60◦S. To help fill ADMAP-1’s regional coverage gaps, the international geomagnetic community from 2001 through 2014 acquired an additional 2.0+ million line-km of airborne and marine magnetic anomaly data. These new data together with surveys that were not previously in the public domain significantly upgraded the ADMAP compilation for Antarctic crustal studies. The merger of the additional data with ADMAP-1’s roughly 1.5 million line-km of survey data produced the second-generation ADMAP-2 compilation. The present study comprehensively reviews the problems and progress in merging the airborne and ship magnetic measurements obtained in the harsh Antarctic environment since the first International Geophysical Year (IGY 1957–58) by international campaigns with disparate survey parameters. For ADMAP-2, the newly acquired data were corrected for the diurnal and International Geomagnetic Reference Field effects, edited for high-frequency errors, and levelled to minimize line-correlated noise. ADMAP-2 provides important new constraints on the enigmatic geology of the Gamburtsev Subglacial Mountains, Prince Charles Mountains, Dronning Maud Land, and other poorly explored Antarctic areas. It links widely separated outcrops to help unify disparate geologic and geophysical studies for new insights on the global tectonic processes and crustal properties of the Antarctic. It also supports studies of the Antarctic ice sheet’s geological controls, the crustal transitions between Antarctica and adjacent oceans, and the geodynamic evolution of the Antarctic crust in the assembly and break-up of the Gondwana and Rodinia supercontinents.

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Aeromagnetic and gravity data over the Central Transantarctic Mountains (CTAM), Antarctica: a website for the distribution of data and maps

Cited by 4 publications

References 0 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

Air and shipborne magnetic surveys of the Antarctic into the 21st century

Compiling ship and airborne measurements for the Antarctic's second-generation magnetic anomaly map

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