Melt equilibration depths as sensors of lithospheric thickness during Eurasia-Arabia collision and the uplift of the Anatolian Plateau

M. R. Reid, J. R. Delph, M. A. Cosca, W. K. Schleiffarth, G. Gençalioğlu Kuşcu

Research output: Contribution to journalArticle

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Abstract

A co-investigation of mantle melting conditions and seismic structure revealed an evolutionary record of mantle dynamics accompanying the transition from subduction to collision along the Africa-Eurasia margin and the > 1 km uplift of the Anatolian Plateau. New 40Ar/39Ar dates of volcanic rocks from the Eastern Taurides (southeast Turkey) considerably expand the known spatial extent of Miocene-aged mafic volcanism following a magmatic lull over much of Anatolia that ended at ca. 20 Ma. Mantle equilibration depths for these chemically diverse basalts are interpreted to indicate that early to middle Miocene lithospheric thickness in the region varied from ~50 km or less near the Bitlis suture zone to ~80 km near the Inner Tauride suture zone. This southward-tapering lithospheric base could be a vestige of the former interface between the subducted (and now detached) portion of the Arabian plate and the overriding Eurasian plate, and/or a reflection of mantle weakening associated with greater mantle hydration trenchward prior to collision. Asthenospheric upwelling driven by slab tearing and foundering along this former interface, possibly accompanied by convective removal of the lithosphere, could have led to renewed volcanic activity after 20 Ma. Melt equilibration depths for late Miocene and Pliocene basalts together with seismic imaging of the present lithosphere indicate that relatively invariant lithospheric thicknesses of 60-70 km have persisted since the middle Miocene. Thus, no evidence is found for large-scale (tens of kilometers) Miocene delamination of the lower lithosphere from the overriding plate, which has been proposed elsewhere to account for late Miocene and younger uplift of Anatolia.

Original languageEnglish (US)
Pages (from-to)943-947
Number of pages5
JournalGeology
Volume47
Issue number10
DOIs
StatePublished - Oct 1 2019

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collision
uplift
Miocene
melt
plateau
sensor
mantle
lithosphere
suture zone
basalt
Arabian plate
delamination
Eurasian plate
hydration
volcanism
slab
volcanic rock
Pliocene
upwelling
subduction

ASJC Scopus subject areas

  • Geology

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Melt equilibration depths as sensors of lithospheric thickness during Eurasia-Arabia collision and the uplift of the Anatolian Plateau. / Reid, M. R.; Delph, J. R.; Cosca, M. A.; Schleiffarth, W. K.; Gençalioğlu Kuşcu, G.

In: Geology, Vol. 47, No. 10, 01.10.2019, p. 943-947.

Research output: Contribution to journalArticle

Reid, M. R. ; Delph, J. R. ; Cosca, M. A. ; Schleiffarth, W. K. ; Gençalioğlu Kuşcu, G. / Melt equilibration depths as sensors of lithospheric thickness during Eurasia-Arabia collision and the uplift of the Anatolian Plateau. In: Geology. 2019 ; Vol. 47, No. 10. pp. 943-947.
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