Marie Byrd Land, West Antarctica: Evolution of Gondwana's Pacific margin constrained by zircon U-Pb geochronology and feldspar common-Pb isotopic compositions

Mukasa, Samuel B.; Dalziel, Ian W. D.

doi:10.1130/0016-7606(2000)112<611:mblwae>2.0.co;2

Cited by 151 publications

(186 citation statements)

References 55 publications

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“…Whereas HT metamorphism and zircon growth is recorded as early as 150 Ma, a majority of points analyzed thus far fall within the interval of 120-100 Ma. Anatectic leucosomes from sites in MBL's Amundsen Province, the Demas Range (Figure 2) yield ages of 128 Ma to 113 Ma for igneous zircon (Mukasa and Dalziel, 2000). The MBL data fall within the 126-107 Ma age range of the youngest arc-related intrusions identifi d in NZ by Muir et al (1997Muir et al ( , 1998, those of the Separation Point and Rahu suites in the Western Province and the deeper level Fiordland Orthogneiss in Fiordland.…”

Section: Convergent Margin Plutonismmentioning

confidence: 82%

“…By contrast, the alkaline plutonism attributed to back-arc extension occurred in eastern MBL ( Figure 5) at 105-102 Ma (Weaver et al, 1992Mukasa and Dalziel, 2000), distinctly later than onset of high temperature metamorphism. In western MBL the Ford Ranges experienced alkalic plutonism at 105-103 Ma and ca.…”

Section: Convergent Margin Plutonismmentioning

confidence: 97%

“…The calc-alkaline, I-type Median Batholith was emplaced in NZ between 145 Ma and 120 Ma, with some ages older, to 170 Ma (Muir et al, 1998;Mortimer et al, 1999a,b;Tulloch and Kimbrough, 2003); and tectonic reconstructions show continuity of the magmatic arc, together with associated tectonic terranes, into MBL-Thurston Island (Figure 3) (e.g., Bradshaw et al, 1997). The arc province in MBL, termed the "Amundsen Province" (Pankhurst et al, 1998), was the site of intermediate plutonism spanning the interval 124 to 96 Ma (Pankhurst et al, 1998;Mukasa and Dalziel, 2000). The timing of HT metamorphism in NZ is determined by U-Pb ages on metamorphic zircon or titanite sampled from gneisses at sites distributed along the convergent margin.…”

Section: Convergent Margin Plutonismmentioning

confidence: 99%

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Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Siddoway¹

2007

Open-File Report

109

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Section: Convergent Margin Plutonismmentioning

confidence: 82%

Section: Convergent Margin Plutonismmentioning

confidence: 97%

Section: Convergent Margin Plutonismmentioning

confidence: 99%

See 1 more Smart Citation

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Siddoway¹

2007

Open-File Report

109

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“…[34] The Meso-Cenozoic geodynamic evolution of Victoria Land is dominated by the concurrent separation of the Antarctic continent from Australia (Southern Ocean rifting) and Great New Zealand, which occurred along roughly orthogonal trends [e.g., Lawver et al, 1992;Sutherland, 1999;Mukasa and Dalziel, 2000] (Figure 9). Evolution of such rifting processes bears fundamental implications for the Cenozoic tectonic evolution of the region.…”

Section: Discussionmentioning

confidence: 99%

“…Despite this evidence, plate tectonic framework of the Australia-Antarctica-New Zealand connection [Lawver and Gahagan, 1994] and data from Marie Byrd Land [Mukasa and Dalziel, 2000;Luyendyk et al, 2001] require a Mesozoic opening of the Ross Sea. The Cape Roberts results may indeed suggest that the locus of Mesozoic extension was originally located eastward of the presentday western Ross Sea shoulder, which may have originated in Cenozoic times.…”

Section: Introductionmentioning

confidence: 99%

Tectonic and denudational history of the Rennick Graben (North Victoria Land): Implications for the evolution of rifting between East and West Antarctica

et al. 2003

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The tectonic depression of the Rennick Graben (northern Victoria Land, Antarctica) is a key element for deciphering the Cenozoic separation history between East and West Antarctica and evolution of the West Antarctic rift system. The geometry, kinematics and timing of the boundary faults of the Rennick Graben are presented, on the basis of a detailed structural study of the major fault segments combined with apatite fission track data. The structural architecture of the Rennick Graben is controlled by distributed and partitioned right‐lateral strike‐slip faulting. Fission track data indicate that the last significant denudation stage of the Rennick Graben shoulders started from Eocene times, with increasing cooling and denudation since 40–50 Ma. A direct structural connection is then established between Cenozoic denudation and the activation of the dextral strike‐slip regime in north Victoria Land during the Cenozoic. In this framework, the Rennick Graben is interpreted as a localized tectonic depression generated as a displacement accommodation area of the regionally sized dextral strike‐slip shearing. The results of this study (1) invalidate the commonly assumed link between Mesozoic Ross Sea rifting and opening of the Rennick Graben; (2) argue against orthogonal rifting models for the Cenozoic evolution of the Ross Sea region; and (3) provide constraints to the modalities and timing of the separation between the East Antarctic craton and the West Antarctica extensional province.

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Applications of detrital geochronology and thermochronology from glacial deposits to the Paleozoic and Mesozoic thermal history of the Ross Embayment, Antarctica

Welke

Licht

Hennessy

et al. 2016

Geochem Geophys Geosyst

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Till from moraines at the heads of six major outlet glaciers in the Transantarctic Mountains (TAM) and from till beneath three West Antarctic ice streams have a ubiquitous zircon U‐Pb age population spanning the time of the Ross/Pan‐African Orogenies (610–475 Ma). Geochronology and thermochronology of detrital minerals in these Antarctic glacial tills reveal two different thermal histories for the central and southern TAM. Double‐dating of the zircons reveals a geographically widespread (U‐Th)/He (ZHe) population of 180–130 Ma in most of the till samples. Sandstone outcrops at Shackleton Glacier, and three Beacon Supergroup sandstone clasts from three moraines, have ZHe ages that fall entirely within this range. The similar population and proximity of many of the till samples to Beacon outcrops lead us to suggest that this extensive ZHe population in the tills is derived from Beacon Supergroup rocks and reflects the thermal response of the Beacon Basin to the breakup of Gondwana. A second population of older (>200 Ma) ZHe ages in tills at the head of Byrd, Nimrod, and Reedy Glaciers. For the tills at the head of the Nimrod and Byrd Glaciers, integrating the double‐dated zircon results with 40Ar/39Ar of hornblende, muscovite and biotite, and U‐Pb and (U‐Th‐Sm)/He double‐dates on apatite yields a typical pattern of early rapid orogenic cooling (∼4–10°C/Myr) 590–475 Ma after the emplacement of the Granite Harbour Intrusives. Low temperature thermochronometers at these sites yield variable but quite old ages (ZHe 480–70 Ma and AHe 200–70 Ma) that require a long history at low temperature.

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Marie Byrd Land, West Antarctica: Evolution of Gondwana's Pacific margin constrained by zircon U-Pb geochronology and feldspar common-Pb isotopic compositions

Cited by 151 publications

References 55 publications

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Tectonic and denudational history of the Rennick Graben (North Victoria Land): Implications for the evolution of rifting between East and West Antarctica

Applications of detrital geochronology and thermochronology from glacial deposits to the Paleozoic and Mesozoic thermal history of the Ross Embayment, Antarctica

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