199 D31. Recent Advances in Tectonics/Tectonophysics

Wednesday, 13 October 2021
8:00 AM - 12:00 PM
D137

COMPILATION OF APATITE FISSION-TRACK DATA FROM ACROSS THE NORTH ATLANTIC: REGIONAL TRENDS AND INTERPRETATIONS

Paper number: 199-6
Program: Technical Sessions
Time: 9:05 AM – 9:20 AM

Authors

Abstract

Low-temperature thermochronology has been widely used to study the evolution of landscapes across the North Atlantic region. Apatite fission-track data have been fundamental in resolving how the upper crust has evolved through the interaction of tectonic and climatic processes. However, many of these studies are limited to small sampling areas, meaning conclusions from individual datasets can contrast significantly and complicate regional interpretations. Notably, the source of elevated topography across the region has long been debated, with some authors interpreting multiple large-scale episodic tectonic events have caused widespread uplift onshore, while others postulate tectonic quiescence and isostatic support of the topography.

We present a compilation of published apatite fission-track data from across the North Atlantic to establish regional trends and support regional interpretations. Data from Scandinavia, Svalbard, East Greenland, Britain and Ireland are included, all margins greatly affected by the formation of the North Atlantic in the Mesozoic and Cenozoic. The spread of ages across the crystalline basement of each margin shows predominantly Mesozoic ages, likely related to effects of rifting during this time. Samples from sedimentary basin across Svalbard, East Greenland, Britain, and Ireland show an assortment of Mesozoic and Cenozoic ages, highlighting the wide array of burial histories from onshore strata across the region and the tectonism of the Spitzbergen Orogeny. Finally, fission-track ages adjacent to large igneous centers in East Greenland and Northern Britain show Cenozoic ages consistent with localised heating related to volcanism of the North Atlantic Igneous Province. Greater debate regarding thermal history modelling and comparisons with other radiomimetic dating systems is warranted, however, this compilation highlights important regional trends and has major implications for future interpretations of the onshore.

Geological Society of America Abstracts with Programs. Vol. 53, No. 6

doi: 10.1130/abs/2021AM-370104

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