Aeromagnetic legacy of early Paleozoic subduction along the Pacific margin of Gondwana

Finn, Carol A.; Moore, David; Damaske, Detlef; Mackey, T.

doi:10.1130/0091-7613(1999)027<1087:aloeps>2.3.co;2

Cited by 81 publications

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“…1) and Antarctica (e.g. anomalies P3-P5) Ferraccioli et al, 2003;Finn et al, 1999) than to Jurassic and Precambrian rocks, suggesting similar Paleozoic sources. If so, these postulated plutons may mark the western edge of the Paleozoic Gondwana margin identified previously by Damaske et al (2003).…”

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

“…2) may indicate Precambrian crust. Farther north, the observed satellite magnetic high most likely reflects magnetic oceanic crust inferred to underlie northern Victoria Land (Armadillo et al, 2004;Ferraccioli et al, 2002;Finn et al, 1999).…”

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

“…2),the origins of which are not clear but may reflect oceanic crust (Finn et al, 1999), abundant magnetite-rich mid-Paleozoic plutons and/or buried Jurassic intrusions.…”

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

“…1) averaging 200-500 nT over the Ross Orogen/TAM region, primarily related to exposed and buried gabbroic and dioritic intrusions that form the southern continuation of the Gondwana-margin magmatic arc in Australia Ferraccioli et al, 2003;Finn et al, 1999). Recently collected data over the Oates and George V Coasts of Antarctica Ferraccioli et al, 2003) show similar wavelength (~100-300 km) magnetic highs near scant outcrop of early Paleozoic plutons (Mark Fanning, unpublished data) (anomalies P1-2, GVL, Fig.…”

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

“…1). The Delamerian belt is expressed by curvilinear highs (100-500 nT) related to exposed and buried gabbroic and dioritic intrusions representing the roots of a magmatic arc along the early Paleozoic convergent margin of Gondwana (Finn et al, 1999;Flottmann et al, 1993). These, and midPaleozoic igneous rocks associated with ovoid magnetic highs farther east, intrude magnetite-poor greywackes and metamorphosed siliciclastic rocks ranging in age from Neoproterozoic and early Cambrian in the west, possibly deposited along the rifted craton margin (Mancktelow, 1990), to Cambrian-Ordovician in the east that produce the magnetic quiet zone.…”

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

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Scouting Craton’s Edge in Paleo-Pacific Gondwana

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The geology of the ice-covered interior of the East Antarctic shield is completely unknown; inferences about its composition and history are based on extrapolating scant outcrops from the coast inland. Although the shield is clearly composite in nature, a large part of its interior has been Paleoproterozoic granites and Meso-to Neoproterozoic mafic igneous rocks are associated with highamplitude, broad-wavelength positive aero-and satellite-magnetic anomalies. The same types of magnetic anomalies can be traced to ice-covered Wilkes Land, Antarctica, and are interpreted to signify similar rocks. However, the diagnostic satellite magnetic high ends ~800 km south of the Antarctic coast, suggesting that the Mawson block is smaller than first proposed and that the remaining East

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Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

“…2),the origins of which are not clear but may reflect oceanic crust (Finn et al, 1999), abundant magnetite-rich mid-Paleozoic plutons and/or buried Jurassic intrusions.…”

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

Section: Aeromagnetic Signatures Of the Mawson Block And Adjacent Regmentioning

confidence: 99%

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Scouting Craton’s Edge in Paleo-Pacific Gondwana

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Structure of the Millen Schist Belt (Antarctica): Clues for the tectonics of northern Victoria Land along the paleo‐Pacific margin of Gondwana

2014

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Northern Victoria Land (Antarctica) belonged to the active proto-Pacific margin of Gondwana, which was the site of convergence during the Paleozoic. This study provides new insights into the structural architecture of northern Victoria Land, focusing on the boundary area between the Bowers and Robertson Bay terranes, i.e., in the Millen Schist Belt. It is a high-strain equivalent of the adjoining terranes, presently delimited by the Leap Year and the Handler faults. Our study reveals that these two faults overprint a preexisting transitional deformational boundary and are associated with a significant syntectonic circulation of fluids and mineralization. The Millen Schist Belt consists of two lithotectonic packages, juxtaposed along the Crosscut-Aorangi duplex thrust system, related to late Ross deformation. As there is increasing evidence of a post-Ross contractional event in northern Victoria Land, we suggest that the structural architecture of the Bowers-Robertson Bay terrane boundary results from a long-lasting SW-NE contractional regime, during the Ross-Delamerian Orogeny and still active afterward. This points to an extension of the Australian Lachlan Orogeny in Antarctica. The similarity of the structural architecture, the gold mineralization, the rock type, and the age supports the correlation of the Bowers and the Robertson Bay terranes with the Stawell Zone of the Lachlan Fold Belt. In our new tectonic scenario the Lanterman Fault (northern Victoria Land) plays the same role as the Moyston Fault (southeastern Australia), and the Leap Year and Handler faults correlate with the "intra-zone faults" of the Stawell Zone (e.g., the Ararat-Stawell Fault Zone).

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Ultrahigh‐pressure metamorphism at the Lanterman Range (northern Victoria Land, Antarctica)

2011

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Northern Victoria Land is a key area for the Ross Orogen-a Palaeozoic fold belt formed at the palaeo-Pacific margin of Gondwana and also known as the Delamerian and Tyennan Orogeny in southern Australia, and Tasmania, respectively. A narrow and discontinuous high-to ultrahigh-pressure (HP/UHP) belt, consisting of mafic and ultramafic rocks (including garnet-bearing types) within a metasedimentary sequence of gneisses and quartzites, is exposed at the Lanterman Range (northern Victoria Land), at the boundary between two main lithotectonic terranes (the Wilson and Bowers terranes). Mesostructural and microstructural relations between eclogitic boudins and country gneisses are, in some areas, characterized by interlayering with sharp contacts on a cm scale. Geological, petrological and geochronological studies indicate that mafic, ultramafic and felsic host rocks underwent a common metamorphic evolution with an UHP eclogite-facies stage % 500 Ma ago at temperatures of up to % 8508C and pressures up to 3.3 GPa. The retrograde P-T path is similar and, indeed, it overlaps in every lithology; it is a nearly isothermal path from UHP conditions up to deep crustal levels, and becomes a cooling-unloading path from intermediate to shallow levels. The discovery of UHP rocks at the Lanterman Range yields eclogite-facies rocks of this area among the rare UHP rocks of the world and represents the only known locality in Antarctica and along the entire palaeo-Pacific margin of Gondwana during the Ross-Delamerian-Tyennan Orogen.

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Aeromagnetic legacy of early Paleozoic subduction along the Pacific margin of Gondwana

Cited by 81 publications

References 0 publications

Scouting Craton’s Edge in Paleo-Pacific Gondwana

Scouting Craton’s Edge in Paleo-Pacific Gondwana

Structure of the Millen Schist Belt (Antarctica): Clues for the tectonics of northern Victoria Land along the paleo‐Pacific margin of Gondwana

Ultrahigh‐pressure metamorphism at the Lanterman Range (northern Victoria Land, Antarctica)

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