New apatite fission-track data from a region South of Terranova Bay in the southern part of northern Victoria Land, Antarctica

Details New apatite fission-track data from a region South of Terranova Bay in the southern part of northern Victoria Land, Antarctica New apatite fission-track data from a region South of Terranova Bay in the southern part of northern Victoria Land, Antarctica

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3879b&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3879

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Scientific paper

Apatite fission-track analysis was applied to a new set of samples collected south of Terra Nova bay in the southern part of northern Victoria Land (NVL). While quite a large data cover is available for the northern and central parts of NVL and for southern Victoria Land, this area was devoid of data. Along the Transantarctic Mountains three denudation episodes, commenced at ˜125, ˜95 and ˜50 Ma, related to regional tectonic events have been recognized. Not all of these denudation stages are present throughout the whole chain. The most extensive throughout the Ross Embayment is that one at ˜50 Ma corresponding to Cenozoic faulting, magmatism and deformation within the Victoria Land basin. An areal sampling along the coast and along an inner parallel band where rocks are exposed in a not elevated coastal ridge (mean elevation ˜1000m) was performed between 74^o30' and 77^o of latitude. Ages from the coastal outcrops span a narrow range (36±3 and 39±4 Ma) with long mean track lengths and short standard deviations (13.7-14.8/2.2-1.2). These data indicate a cooling of more than 120^oC during Cenozoic time and, assuming a paleo-geothermal gradient of 25-30^oC/km, much more than 5-6 km of denudation. From the coastal ridge two short vertical profiles at Mt. Priestley and at Mt George Murray were sampled (1077-750 m and 1100-90 m, respectively). Ages strongly correlate with elevation and they reach a value of 71±5 Ma. Samples with ages older than 55 Ma show shorter mean track lengths and larger standard deviations. In the Mt George Murray profile the presence of a break in slope at ˜50 Ma and 800 m is suggested. It testifies that also in this part of NVL, as to the North and to the South, an episode of rapid cooling and denudation commenced in the Early Cenozoic. An amount of denudation of almost 5-6 km can be estimated for this part of the coastal ridge. The difference in the amount of denudation between the coast and the coastal ridge can be explained either by a landscape evolution model of a rifted margin with the erosion of an elevated rift shoulder (decreasing amount of denudation from the coast toward the interior) or by the presence of a fault between the two areas.

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