Seafloor Spreading Processes in Protoarc-Forearc Settings: Eastern Albanian Ophiolite as a Case Study

Title:	Seafloor Spreading Processes in Protoarc-Forearc Settings: Eastern Albanian Ophiolite as a Case Study
Author:	Phillips, Charity M.
Description:	Northern Albania's Mirdita ophiolite displays two distinct belts of Jurassic Neotethyan oceanic crust that developed between the Apulian and Pelagonian margins. The western belt consists of an ~3-km-thick MORB pseudostratigraphy, in which pillow lavas overlie serpentinized peridotites, suggesting tectonic extension dominated early stages of seafloor spreading. The eastern belt includes an ~10-km-thick complete pseudostratigraphy with extrusives that show increasing IAT chemistry upsection. Mutually intrusive relations between crustal units indicate robust magmatic spreading occurred. Four dike generations (D1-D4) exist based on structure, crosscutting relations, and texture. D1-D4 are composed of diabase dikes. D1 strike 030-060o, dips SE, and is crosscut by NE dipping D2 dikes oriented 290-340o. D3-D4 crosscut D1-D2 and strike of 240-290o with northerly dips. Boninite and rhyodacite dikes intruded throughout the SDC's history because of complex magmatic processes. These relations suggest the spreading direction changed from NNE-SSW to NW-SE because of the incipient Mirdita-Pelagonia collision in the South.
Permanent Link:	http://rave.ohiolink.edu/etdc/view?acc_num=miami1083687853 http://hdl.handle.net/2374.OX/18329
Date:	2004

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