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- W1929140758 abstract "ABSTRACT The USARP Mountains comprise two N–S‐aligned mountain ranges (Daniels Range, Pomerantz Tableland) located along the western margin of the Rennick Glacier in Northern Victoria Land (NVL). Four zircon and titanite fission track (FT) ages from granitic samples from the Pomerantz Tableland fall in a common range of 369–392 Ma. The apatite FT ages from 20 Granite Harbour Intrusive rocks sampled throughout the USARP Mountains are distinctively younger (86–270 Ma); their mean track lengths (MTL) vary between 11.0 and 13.9 μm. Six samples from Renirie Rocks and the Kavrayskiy Hills east of the USARP Mountains have even younger, concordant apatite FT ages of 43–71 Ma, and MTL of 12.2–14.0 μm. Thermal history modelling of the thermochronological data indicate that both the Daniels Range and Pomerantz Tableland experienced a common Phanerozoic geologic history consisting of a mid‐Devonian pulse of rapid denudation, followed by a protracted denudation stage between the Carboniferous and Jurassic. This latter period of denudation was contemporaneous with the formation of the Transantarctic Basin to the east. We consequently suggest that the USARP Mountains were one of the major source areas for the Beacon Supergroup that formed the fill of the Transantarctic Basin. Subsequent to the deposition of the Beacon sequence, the now‐outcropping rocks of the USARP Mountains were buried to a maximum depth of 4.2 km. A palaeogeothermal gradient of 25±8°C km −1 was inferred at the time of maximum burial. Inversion of the Transantarctic Basin due to the breakup of Gondwana, and in response to Cenozoic rifting and uplift of the Transantarctic Mountains, has triggered the final denudation stages recorded in NVL since the Cretaceous. Thereby, the amounts of denudation increase eastward. Whereas 2.4–4.2 km of crustal unloading are recognized for the USARP Mountains since the Cretaceous, more than 4 km of denudation has occurred towards the Rennick Graben alone since the Eocene. This denudation was associated with major fault activities involving early ENE–WSW to E–W‐directed extension. Related structures were reactivated by dominant NW–SE to NNW–SSE‐oriented right‐lateral shear genetically linked to the formation and inversion of the structural depression of the Rennick Graben in Cenozoic times." @default.
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- W1929140758 date "2006-12-01" @default.
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- W1929140758 title "Transantarctic Basin: new insights from fission track and structural data from the USARP Mountains and adjacent areas (Northern Victoria Land, Antarctica)" @default.
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- W1929140758 doi "https://doi.org/10.1111/j.1365-2117.2006.00301.x" @default.
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