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

<p>The Eldivan ophiolite, in the Ankara Mélange, represents the remnant of an ocean basin that developed in the İzmir-Ankara-Erzincan Ocean and collapsed the form the İzmir -Ankara-Erzincan suture zone (İAESZ) 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 Karadağ Formation suggest the ophiolites maximum age is 143.2 (±2) Ma, and the overlying Karadağ Formation is 105.2 (±5) Ma. The angular unconformity between the ophiolite and Karadağ 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.</p>

Name thesis:degree_name

MS

Grantor dc:publisher

Brigham Young University - Provo

Author dc:creator

• Dangerfield, Anne

• Ankara Melange
• suture zone
• ophiolite
• SSZ
• Tethys
• Geology

Language dc:language

English

Repository record dc:identifier

https://scholarsarchive.byu.edu/etd/1393

OAI identifier oai:identifier

oai:scholarsarchive.byu.edu:etd-2392