Testing the validity of organic and inorganic thermal indicators in different tectonic settings from continental subduction
to collision: the case history of the Calabria–Lucania border (southern Apennines, Italy)
S. Corrado
C. Invernizzi
L. Aldega
M. D'Errico
P. Di Leo
S. Mazzoli
M. Zattin
10.6084/m9.figshare.3454862.v1
https://geolsoc.figshare.com/articles/dataset/Testing_the_validity_of_organic_and_inorganic_thermal_indicators_in_different_tectonic_settings_from_continental_subduction___to_collision_the_case_history_of_the_Calabria_Lucania_border_southern_Apennines_Italy_/3454862
<p>This paper investigates the applicability of organic and inorganic thermal parameters in a range of thermal conditions, from
diagenesis to epizone, and in HP–LT settings within the framework of continental subduction and exhumation in the southern
Apennines, where independent thermobarometric constraints are available. Two juxtaposed tectonic units, the HP–LT Lungro–Verbicaro
Unit (in the hanging wall) and the non-metamorphic Pollino–Ciagola Unit (in the footwall) have been analysed. For the Lungro–Verbicaro
Unit, clay mineral thermal parameters and vitrinite reflectance underestimate metamorphic conditions (constrained by petrology),
suggesting that, in relatively HP units, these indicators are ‘retarded' and strongly depend on <em>P</em>–<em>T</em> evolution through time. On the other hand, the K-white mica <em>b</em> cell dimension provides a robust estimate of peak pressure. Fluid inclusion textures indicate a fast isothermal decompression
during exhumation. Two-phase inclusions from early stage syntectonic veins were trapped after isothermal exhumation at a pressure
of 0.3 GPa. For the Pollino–Ciagola Unit, the correlation of analysed parameters effectively unravels the thermal evolution,
with maximum palaeotemperatures of <em>c</em>. 150 °C. Apatite fission tracks provide details of the final stages of exhumation, indicating that both units were coherently
exhumed in the Late Miocene, following the tectonic emplacement of the Lungro–Verbicaro Unit on top of the Pollino–Ciagola
Unit.
</p>
2016-06-21 12:24:16
tectonic emplacement
0.3 GPa
peak pressure
Lungro
HP units
Apatite fission
tectonic settings
Pollino
thermobarometric constraints
Fluid inclusion textures
exhumation
tectonic units
vitrinite reflectance
case history
stage syntectonic veins
clay mineral
parameter
Geology