Detrital zircon and provenance analysis of Late Cretaceous–Miocene onshore Iranian Makran strata: Implications for the tectonic setting

2016 ◽  
Vol 128 (9-10) ◽  
pp. 1481-1499 ◽  
Author(s):  
Ali Mohammadi ◽  
Jean-Pierre Burg ◽  
Wilfried Winkler ◽  
Jonas Ruh ◽  
Albrecht von Quadt
Keyword(s):  
Late Cretaceous ◽  
Detrital Zircon ◽  
Tectonic Setting ◽  
Provenance Analysis

scholarly journals Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 83
Author(s):  
Sofia Laskari ◽  
Konstantinos Soukis ◽  
Stylianos Lozios ◽  
Daniel F. Stockli ◽  
Eirini M. Poulaki ◽  
...  
Keyword(s):  
High Pressure ◽  
Shear Zone ◽  
Late Cretaceous ◽  
Detrital Zircon ◽  
Late Triassic ◽  
Late Paleozoic ◽  
Rift Basin ◽  
Provenance Analysis ◽  
Volcanic Material ◽  
The Difference

Detailed mapping and structural observations on the Cycladic Blueschist Unit (CBU) on Iraklia Island integrated with detrital zircon (DZ) U-Pb ages elucidate the Mesozoic pre-subduction and the Cenozoic orogenic evolution. Iraklia tectonostratigraphy includes a heterogeneous Lower Schist Fm., juxtaposed against a Marble Fm. and an overlying Upper Schist Fm. The contact is an extensional ductile-to-brittle-ductile, top-to-N shear zone, kinematically associated with the Oligo-Miocene exhumation. The DZ spectra of the Lower Schist have Gondwanan/peri-Gondwanan provenance signatures and point to Late Triassic Maximum Depositional Ages (MDAs). A quartz-rich schist lens yielded Precambrian DZ ages exclusively and is interpreted as part of the pre-Variscan metasedimentary Cycladic Basement, equivalent to schists of the Ios Island core. The Upper Schist represents a distinctly different stratigraphic package with late Cretaceous MDAs and dominance of Late Paleozoic DZ ages, suggestive of a more internal Pelagonian source. The contrast in the DZ U-Pb record between Lower and Upper Schist likely reflects the difference between a Paleotethyan and Neotethyan geodynamic imprint. The Triassic DZ input from eroded volcanic material is related to the final Paleotethys closure and Pindos/CBU rift basin opening, while late Cretaceous metamorphic/magmatic zircons and ~48–56 Ma zircon rims constrain the onset of Neotethyan convergence and high-pressure subduction metamorphism.

scholarly journals Provenance Analysis and Structural Study of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation

2021 ◽  
Author(s):  
Sofia Laskari ◽  
Konstantinos Soukis ◽  
Stylianos Lozios ◽  
Daniel F. Stockli ◽  
Eirini M. Poulaki ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Detrital Zircon ◽  
Field Data ◽  
Late Triassic ◽  
Rift Basin ◽  
Provenance Analysis ◽  
Volcanic Material ◽  
Source Areas ◽  
High Pressure Metamorphism ◽  
Orogenic Events

Detailed mapping and structural observations on the Cycladic Blueschist Unit (CBU) of Iraklia island integrated by detrital zircon (DZ) U-Pb ages elucidate the Mesozoic pre-subduction evolution and the Cenozoic orogenic events. Field data reveal that the Iraklia tectonostratigraphy includes a heterogeneous Lower Schist Unit juxtaposed against a Variegated Marble Unit and an overlying Upper Schist Unit. The contact is an extensional ductile-to-brittle-ductile, top-to-N shear zone, associated with the Oligo-Miocene exhumation. The DZ spectrum of the Lower Schist Unit characterized by Gondwanan/peri-Gondwanan provenance signatures points to Late Triassic maximum depositional ages (MDAs). A quartz-rich schist layer yielded Precambrian DZ ages exclusively, considered part of the pre-Variscan metasedimentary Cycladic Basement, equivalent to those observed on Ios island. A significant change occurred during the deposition of the Upper Schist Unit, revealing Late Cretaceous MDAs and a high amount of Late Paleozoic DZ ages, attesting to more internal Pelagonian source areas. The imprint of Paleotethyan vs. Neotethyan geodynamic events is revealed in the DZ U-Pb ages record. The Triassic DZ input demonstrates eroded volcanic material related to the final Paleotethys closure and the Pindos/CBU rift basin opening. Late Cretaceous metamorphic/magmatic zircons and ~48-56 Ma zircon rims constrain the onset of subduction and high-pressure metamorphism.

A WINDOW INTO THE LATE CRETACEOUS PALEOGEOGRAPHY OF THE U. S. CORDILLERA: PROVENANCE ANALYSIS OF THE OCHOCO BASIN, CENTRAL OREGON

2017 ◽  
Author(s):  
Kathleen D. Surpless ◽  
◽  
Kirk D.H. Gulliver ◽  
Bernard A. Housen ◽  
Jeff D. Vervoort
Keyword(s):  
Late Cretaceous ◽  
Provenance Analysis
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