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| Titel |
Upper Triassic Foraminiferal Biostratigraphy and Geochemistry of Associated Volcanics of Bitlis Massif |
| VerfasserIn |
Ayşe Atakul-Özdemir, Demir Altiner, Yavuz Özdemir, Vural Oyan |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148135
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| Publikation (Nr.) |
 EGU/EGU2017-12366.pdf |
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| Zusammenfassung |
| The Bitlis Massif forms a part of the Tethyan suture zone that was accumulated during late
Mesozoic-Early Cenozoic time. It is an allochthonous unit with a high-grade metamorphic
basement and a low-grade cover sequence. The studied section, mainly characterized by
recrystallized limestone, is within the cover sequence of the Massif and located at
southeastern parts of the Elazı ğ city. The base of the section starts with volcanic rocks and
is followed upwards by limestone alternating with volcanics. The upper part of
the succession is mainly characterized by limestones with large megalodonts. The
Upper Triassic bioata within the succession dominantly consists of involutinids,
which are strongly recrystallized, nodosarids, trochamminids and ammodiscidids.
The most common taxa include Triasina hantkeni, which is a zone marker for the
Sevatian-Rhaetian interval, Aulotortus gr. sinuosus, Aulotortus friedli, Aulotortus sp.,
Auloconus permodiscoides. Based on the foraminiferal taxa, Triasina hantkeni assemblage
zone is determined within the studied succession and a Late Norian-Rhaetian age is
attributed.
Volcanic rocks of the section found at the lower parts of the succession are alkaline
meta-basalts and have enriched MORB affinities with lower Mg#. LILE and LREE
display enrichments relative to the HFSE and HREE respectively. Partial melting
model calculations suggest that basaltic rocks of the section would be produced by
melting of garnet bearing mantle sources. Preliminary results of our study have
evidence for the rifting and continental break-up to form the Southern Neotethys. |
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