U-Pb and 40Ar/39Ar geomorphology of the Symvolon granodiorite: implications for the thermal and structural evolution of the Rhodope metamorphic core complex, northeastern Greece
Article Abstract:
U-Pb dates of Zircon and titanite, and 40Ar/39Ar dates of hornblende which constrain the intrusion and incipient mylonitization of the Symvolon or 'Kavala' granodiorite within the Symvolon shear zone in northeastern Greece at nearly 300 degrees for 5-7 my suggest that the coaxial deformations have continued within a widening Symvolon rupture. The Symvolon shear zone in middle Miocene time was succeeded by the Styrmon valley detachment. The unroofing of the Rhodope metamorphic core complex was facilitated by southwestward displacement of the Serbo-Macedonian gneiss complex by 80 km.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1995
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Temporal variations in the cooling and denudation history of the Hunza plutonic complex, Karakoram Batholith, revealed by 40Ar/39Ar thermochronology
Article Abstract:
The 40Ar/39Ar thermochronology of the Late Cretaceous Hunza plutonic complex (HPC) of Karakoram Batholith shows that HPC underwent cycles of cooling and denudation after its emplacement during Late Cretaceous. The argon isotope analyses of biotites and alkali feldspars suggest rapid cooling and denudation at 20 and 12 Ma respectively. According to the apatite fission track data, denudation of 2.9 plus or minus 0.4 km has occurred since the Plio-Pleistocene period. About 10 kms of material have been removed from the plutonic complex since mid-late Miocene period.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
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Middle Ordovician high PT metamorphic rocks in eastern Australia: evidence from K-Ar ages
Article Abstract:
Phengite, three blueschist, and one metabasite from eastern Australia have yielded K-Ar ages of 465-480 Ma, that turns out to be significantly older than the age of most of the components in the New England fold belt. The tectonic affinity of the blocks is uncertain and they may be related to the Paleozoic convergent margin components that are found in the Paleozoic fold belts in eastern Australia. The analysis of schists and metabasite provides the first conclusive evidence of early Paleozoic subduction accretion in east Gondwana margin.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1995
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