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Geochemistry, structure, and tectonic evolution of the Eldivan ophiolite, Ankara Melange, central Turkey Geochemistry, structure, and tectonic evolution of the Eldivan ophiolite, Ankara Melange, central Turkey

by Dangerfield, Anne 1984-

Abstract (Summary)
The Eldivan ophiolite, in the Ankara Mélange, represents the remnant of an ocean basin that developed in the ?zmir-Ankara-Erzincan Ocean and collapsed the form the ?zmir -Ankara-Erzincan suture zone (?AESZ) through continental block collision. Whole-rock and mineral geochemical evidence show supra-subduction zone tectonomagmatic affinity for the ophiolite, revealing this basin formed in the upper plate of an intra-oceanic subduction zone. Detrital zircon from the ophiolitic mélange sandstone and the overlying Karada? Formation suggest the ophiolites maximum age is 143.2 (±2) Ma, and the overlying Karada? Formation is 105.2 (±5) Ma. The angular unconformity between the ophiolite and Karada? formation reveal that the Eldivan ophiolite was imbricated between 105.2 (±5) Ma and 143.2 (±2) Ma. Petrographic analysis of sandstone from the ophiolitic mélange reveals a source terrain of a volcanic arc rather than a continental source. Structural restoration of the sheeted dike complex reveals the back or intra-arc spreading ridge of the Eldivan ophiolite as NE-SW, oblique to the Sakarya-Pontide continental margin. Three phases of evolution for the Eldivan ophiolite are constrained by complied age data: a constructional, destructional, and suturing phase. The evolution is similar the Philippine Sea Plate and Mariana Trough and fits well within the framework of other eastern Mediterranean Tethyan ophiolites.
Bibliographical Information:

Advisor:

School:Brigham Young University

School Location:USA - Utah

Source Type:Master's Thesis

Keywords:ankara melange suture zone ophiolite ssz tethys

ISBN:

Date of Publication:06/13/2008

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