10.6084/m9.figshare.3453776.v1
Nathan Cogné
Nathan
Cogné
David Chew
David
Chew
Finlay M. Stuart
Finlay M.
Stuart
The thermal history of the western Irish onshore
Geological Society of London
2016
Cenozoic exhumation
Jurassic
1.5 km
Cretaceous
Neogene times
track lengths
Cenozoic cooling event
sample profiles
Mesozoic rifting
Irish onshore
Thermal histories
2.5 km
apatite
modelling show
thermochronological study
Atlantic margin
data
cooling event
surface temperatures
Geology
2016-06-21 11:40:30
Dataset
https://geolsoc.figshare.com/articles/dataset/The_thermal_history_of_the_western_Irish_onshore/3453776
<p>We present here a low-temperature thermochronological study that combines the apatite fission-track and (U + Th)/He dating
methods with a pseudo-vertical sampling approach to generate continuous and well-constrained temperature–time histories from
the onshore Irish Atlantic margin. The apatite fission-track and (U + Th)/He ages range from the Late Jurassic to Early Cretaceous
and the mean track lengths are relatively short. Thermal histories derived from inverse modelling show that following post-orogenic
exhumation the sample profiles cooled to <em>c</em>. 75 °C. A rapid cooling event to surface temperatures occurred during the Late Jurassic to Early Cretaceous and was diachronous
from north to south. It was most probably caused by <em>c</em>. 2.5 km of rift-shoulder related exhumation and can be temporally linked to the main stage of Mesozoic rifting in the offshore
basins. A slow phase of reheating during the Late Cretaceous and Early Cenozoic is attributed to the deposition of a thick
sedimentary sequence that resulted in <em>c</em>. 1.5 km of burial. Our data imply a final pulse of exhumation in Neogene times, probably related to compression of the margin.
However, it is possible that an Early Cenozoic cooling event, compatible with our data but not seen in our inverse models,
accounts for part of the Cenozoic exhumation.
</p>