Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/5024
Title: Development of the early Carnian deepening upward sequence of the Huglu Unit within the tectonic slices/blocks of the Mersin Mélange, southern Turkey: Biochronologies, geochemistry of volcaniclastics and palaeogeographic implications
Authors: Tekin, U.K.
Krystyn, L.
Kürschner, W.M.
Sayit, K.
Okuyucu, Cengiz
Forel, M.-B.
Keywords: Biochronology
Geochemistry
Late Triassic
Mélange
Northern Neo-Tethys
Palaeogeography
Southern Turkey
biochronology
biogeochemistry
biostratigraphy
melange
paleogeography
rifting
succession
Triassic
volcanism
Mersin [Turkey]
Turkey
Publisher: Elsevier B.V.
Abstract: The Mersin Ophiolitic Complex in southern Turkey includes two different units; the Mersin Mélange (MM) and Mersin Ophiolite with a metamorphic sole. Within the MM the Tavuscayiri megablock exposes in the Kilin section the Carnian Tavuscaryiri Formation with an alternation of conglomerates and sandstones at the base, followed by sandy limestones and thick-bedded to massive limestones overlain by volcanoclastics of the Huglu Tuffites. This succession is interpreted as a deepening upward sequence from fluvial to pelagic marine conditions. We present a new interdisciplinary study with focus on biochronology and geochemistry in order to elucidate the stratigraphy and palaeogeographic history of this succession. We discuss the potential impact of the Huglu volcanism on the Late Triassic climate shift, the Carnian Pluvial Event (CPE). The biochronology based on palynomorphs, ammonoids, conodonts, radiolaria and ostracods indicate that the drowning of the platform took place within <2 Ma of the Early Carnian. The Huglu Tuffites include subalkaline felsic vitric tuffs and tuffites. These volcaniclastics are highly rich in Th and display prominent negative anomalies. These features suggest their subduction-related origin. Our data suggest that the oceanic Sorgun Arc and the northern margin of the Gondwanan Tauride-Anatolide Platform (TAP) were under extension owing to back-arc rifting in the Late Triassic. The Huglu Tuffites were deposited in prograding deepening rifted back-arc basin nearby the oceanic-continent transition. While the subduction-related basalts with depleted geochemical signatures were erupted in the rifted Sorgun Arc, the continuum of these back-arc rifting at the northern edge of the TAP culminated in the voluminous volcanic activity of the Huglu Tuffites during the late Early to Late Carnian. The new biochronological findings show that the main volcanic activity correlates with the beginning of the CPE and therefore may represent an important trigger for this climate event. © 2023
URI: https://doi.org/10.1016/j.palaeo.2023.111964
https://hdl.handle.net/20.500.13091/5024
ISSN: 0031-0182
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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