1997
DOI: 10.1016/s0009-2541(97)00037-5
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Hobbs Coast Cenozoic volcanism: Implications for the West Antarctic rift system

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Cited by 104 publications
(138 citation statements)
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References 70 publications
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“…The Late Cretaceous tectonic events were accompanied by intense volcanism in East Gondwana and Marie Byrd Land at c. 95-110 Ma (e.g., Hart et al, 1997;Storey et al, 1999). This magmatism has been related to large-scale mantle upwelling in conjunction with extensioninduced rifting (Finn et al, 2005).…”
Section: Tectonic and Magmatic Evolution Of The Sw-pacific Over The Pmentioning
confidence: 99%
“…The Late Cretaceous tectonic events were accompanied by intense volcanism in East Gondwana and Marie Byrd Land at c. 95-110 Ma (e.g., Hart et al, 1997;Storey et al, 1999). This magmatism has been related to large-scale mantle upwelling in conjunction with extensioninduced rifting (Finn et al, 2005).…”
Section: Tectonic and Magmatic Evolution Of The Sw-pacific Over The Pmentioning
confidence: 99%
“…500-100 Ma (e.g. Handler et al, 2003;Hart et al, 1997; Panter et al, 2006; Rocchi 331 et al, 2002; Scott et al, 2014a; Zhang and O'Reilly, 1997), and prior to the mid-Cretaceous 332 separation of New Zealand from Antarctica. However, placing strict time constraints on the 333 15 emplacement of this radiogenic Pb signature in the SCLM is complicated because: 1) it is 334 unlikely that the xenoliths were in isotopic equilibrium immediately prior to the metasomatic 335 event; and 2) the preservation of variable amounts of mantle sulfides aids in the development 336 Fig.…”
mentioning
confidence: 99%
“…40 Ar/ 39 Ar geochronologic results from Coleman Nunatak differ significantly from previously published KAr results and have implications for petrologic models as well as the glaciovolcanic history of Marie Byrd Land. A wide range of previous K/Ar ages, 11.7 to 2.5 Ma, was interpreted as an indication of long-lived volcanism at Coleman Nunatak (LeMasurier et al, 1990;Hart et al, 1997). Detailed sampling (n=11) and high precision 40 Ar/ 39 Ar ages suggest that the volcanism was monogenetic and occurred at 2.58±0.05 Ma.…”
Section: Emergent To Subaerial Paleoenvironmentsmentioning
confidence: 98%
“…Two glassy pyroclastic bomb and block samples collected from tuff units yielded discordant age spectra and anomalous older ages that were rejected as inaccurate derterminations of eruption age. Hart et al (1997) developed a complicated petrologic model to explain the lack of chemical and isotopic changes at Coleman Nunatak over the long time interval (8 Ma) suggested by K/Ar ages. The 40 Ar/ 39 Ar ages combined with the geochemical data of Hart et al (1997) suggest that Coleman Nunatak is a chemically homogeneous, monogenetic volcano.…”
Section: Emergent To Subaerial Paleoenvironmentsmentioning
confidence: 99%
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