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Title: Coeval extension, sedimentation and arc-volcanism along the Oligo-Miocene Sardinian Rift
Author: Sowerbutts, Alison A.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1997
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Abstract:
The Oligo-Miocene Sardinian Rift is an intra-arc basin which formed in response to multiphase extension and transtension on several orientations of normal and strike-slip faults. Rifting occurred during and after the separation and rotation of the Corsica-Sardinia microplate from Eurasia, coeval with northwestward dipping subduction of Neotethyan oceanic crust beneath the islands. The Sardinian rift comprises many semi-independent sub-basins which are filled with complex arrangements of non-marine and marine, siliciclastic, carbonate and marlstone sediments plus subduction-derived extrusive and pyroclastic volcanic rocks. Exposures in the Sardinian Rift provide a rare opportunity to study the evolution of, and processes active within intra-arc and back-arc basins. Field observations from along the Oligo-Miocene Sardinian Rift are presented and placed within a new chronostratigraphic framework. A tectono-stratigraphic synthesis of the Sardinian Rift has implications for the Oligo-Miocene tectonic development of the Western Mediterranean and for extensional settings in general. Geochemical analysis of volcanic-arc rocks provides clues as to what happens at depth when continental arc magmatism and extension are combined. Rifting commenced in the mid-late Oligocene, coeval with the eruption of the first volcanic-arc rocks, whilst the Sardinia-Corsica microplate was attached to Eurasia. The resultant proto-Sardinian rift formed with considerable along-strike variability. It consisted of a N-S segment in northern Sardinia which was cross-cut by NE-SW trending, elongate transtensional sub-basins. In southern Sardinia, the main rift segment was oriented NW-SE with separate E-W trending grabens dissecting the southernmost pre-rift basement. Geometries within continental clastic sediments shed from local topographic highs and basinward lacustrine limestones suggest that the first phase of extension was short-lived (
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.662295  DOI: Not available
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