1,720,982 research outputs found
Anchizonal-hydrothermal growth and (U-Th)/He dating of rutile crystals in the sediments of Hawasina window, Oman
No full textDECIPHERING THE SPATIO-TEMPORAL EVOLUTION OF OF KIRTHAR FOLD-THRUST BELT AND FORELAND BASIN,WESTERN PAKISTAN
No full textCOMBINATION OF ZIRCON MORPHOLOGY AND FISSION TRACK DATING IN PROVENANCE STUDIES - ORIGIN OF THE MACIGNO FORMATION (APPENNINES,ITALY).
No full textCombination of silgle-grain fission track chronology and morphological analises of detrital zircon crystals in provenace studies - origin of the Macigno Formation (Apennines, Italy).
No full textPetrogenesis of oligocene plutonic rocks in western Anatolia (NW Turkey): Insights from mineral and rock chemistry, Sr-Nd isotopes, and U-Pb, Ar-Ar and (U-Th)/He geochronology
No full textThe emplacement history of granitic intrusions into the upper crust: Forceful to passive emplacement of the early Miocene Solarya Pluton (NW Turkey) as a case study
No full textTectono-metamorphic evolution of the Tethyan Sedimentary Sequence (Himalayas, SE Tibet)
No full textThe Tethyan Sedimentary Sequence, one of the major tectonic units of the Himalayan belt
cropping out in the inner portion of the Himalayan belt, has been investigated in SE Tibet to unravel
its tectonic and metamorphic evolution.
The Tethyan Sedimentary Sequence recorded at least three phases of ductile defomation, all of them
associated to the development of folds and related axial plane foliations. A prominent D1
deformation is progressively overprinted by a D2 deformation approaching the Yarlung Tsangpo
suture zone to the North. Structural analysis allowed to recognise two first-order different structural
domains: a southern domain in which D1 is the prominent deformation and a northern domain in
which the D2 overprint predominates up to transpose D1 deformation. F2 folds show a regional
backward vergence (northward) with respect to the southward verging F1 folds. Finite strain data
show an increase of D2-related strain moving to the North. It is worth to note that new P-T-d data
on polydeformed chloritoid schists point out an increase of both temperature and pressure from D1
to D2 deformation indicating prograde burial during D1-D2 phases and support that F2 folds
developed in a compressive tectonic framework during crustal thickening in the time span of 35-25
Ma. The integration of our new deformation and P-T data with available literature data will help to
deconvolve the long lasted history of this tectonic unit, far away to be well understood
Å. Hestnes, D. Gasser, A. K. Ksienzyk, I. Dunkl, L-E. R. Pedersen, T. Scheiber, H. Sirevaag, F. U. Bauer, J. Jacobs (2024): The tectono-thermal evolution of Western Norway – new insights from low-temperature thermochronology, submitted to Tectonics
No full textThis repository contains the supporting information to the manuscript of Hestens et al. "The tectono-thermal evolution of Western Norway – new insights from low-temperature thermochronology
Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data
Full text linkThis paper presents low-temperature thermochronological data and K‑Ar fault gouge ages from the Sierra
de San Luis in the Eastern Sierras Pampeanas in order to constrain its low-temperature thermal evolution and exhumation
history. Thermal modelling based on (U-Th)/He dating of apatite and zircon and apatite fission track dating point
to the Middle Permian and the Triassic/Early Jurassic as main cooling/exhumation phases, equivalent to ca. 40-50% of
the total exhumation recorded by the applied methods. Cooling rates are generally low to moderate, varying between
2-10 °C/Ma during the Permian and Triassic periods and 0.5-1.5 °C/Ma in post-Triassic times. Slow cooling and, thus,
persistent residence of samples in partial retention/partial annealing temperature conditions strongly influenced obtained
ages. Thermochronological data indicate no significant exhumation after Cretaceous times, suggesting that sampled
rocks were already at or near surface by the Cretaceous or even before. As consequence, Cenozoic cooling rates are
low, generally between 0.2-0.5 °C/Ma which is, depending on geothermal gradient used for calculation, equivalent to a
total Cenozoic exhumation of 0.6-1.8 km. K-Ar fault gouge data reveal long-term brittle fault activity. Fault gouge ages
constrain the end of ductile and onset of brittle deformation in the Sierra de San Luis to the Late Carboniferous/Early
Permian. Youngest K-Ar illite ages of 222-172 Ma are interpreted to represent the last illite formation event, although
fault activity is recorded up to the Holocene
Metamorphism, magmatism, and exhumation history of the Tavşanlı Zone, NW Turkey: new petrological constraints
No full text- …
