Geochemistry of the Cretaceous-Tertiary (K/T) Transition Clays in the Southeastern Turkey
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Batman University
Submission date: 2023-09-25
Final revision date: 2023-11-13
Acceptance date: 2024-02-05
Publication date: 2024-03-27
Corresponding author
Sema Tetiker   

Batman University
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2024;40(1):85-103
The mineralogy and chemistry of Upper Cretaceous-Lower Paleocene claystone sediments from Mardin and Batman, southeastern Turkey, were analyzed. The main mineral paragenesis in the Upper Cretaceous member formed chlorite-smectite (C-S) and illite, while the Lower Paleocene member occurred of chlorite-vermiculite (C-V) and vermiculite minerals. The clays were silica-poor but indicated high values of Al, Fe, Mg, Cr, Ni, V, and Zr. Lower contents of the alkali elements (Na, Ca, Mg, K) of the clayey sediments suggests a relatively denser weathering of the source area. The mineralogical compositions, major element ratios, trace, and rare earth element (REE) contents of the sediments show that the Upper Cretaceous member consists of materials with a mainly felsic source lithology, while relatively contributions from basic sources are found in the Lower Paleocene unit. A comparison of the major and trace element contents of the phyllosilicate/clay minerals with the members revealed that the patterns of the clays were different from each other, although the enrichments/decreases varied depending on the origin (basement rocks or detrital) of the derived rocks, minerals, and elements. REE content of clays increased from detrital to phyllosilicate/clay minerals of chemical/diagenetic/neoformation origin during the Lower Paleocene. During the Cretaceous and Tertiary periods, local or regional geodynamic and diagenetic events largely governed the rock sedimentation processes and provenance variations amongst Germav Formation members.
Some of this research was funded by the Research Fund of Batman University, as part of Project Number 2016-YL-4. Ömer Bozkaya (Pamukkale University), and Dicle Bal Akkoca (Fırat University) are also thanked for their scientific contributions
Geochemia iłów przejściowych kredy i trzeciorzędu (K/T) w południowo-wschodniej Turcji
płyta arabska, minerały ilaste, formacja Germav, źródło, REE
W artykule przeanalizowano mineralogię i skład chemiczny osadów iłowców górnej kredy i dolnego paleocenu z Mardin i Batman w południowo-wschodniej Turcji. Główną paragenezą minerałów w elemencie górnej kredy były minerały chloryt-smektyt (C-S) i illit, natomiast w elemencie dolnego paleocenu występowały minerały chloryt-wermikulit (C-V) i wermikulit. Gliny były ubogie w krzemionkę, ale wykazywały wysoką zawartość Al, Fe, Mg, Cr, Ni, V i Zr. Niższa zawartość pierwiastków alkalicznych (Na, Ca, Mg, K) w osadach ilastych sugeruje stosunkowo intensywne zwietrzenie obszaru źródłowego. Skład mineralogiczny, proporcje głównych pierwiastków, zawartość pierwiastków śladowych i pierwiastków ziem rzadkich (REE) w osadach pokazują, że element górnej kredy składa się z materiałów o litologii źródeł felsowych, podczas gdy stosunkowo udział źródeł podstawowych występuje w jednostce dolnego paleocenu. Porównanie zawartości pierwiastków głównych i śladowych w minerałach krzemianów warstwowych/ilastych z członami ujawniło, że układy glin różniły się od siebie, chociaż wzbogacenia/ubytki były odmienne w zależności od pochodzenia (skały bazowe lub detrytyczne) skał pochodnych, minerałów i pierwiastków. W dolnym paleocenie zawartość REE w iłach wzrosła z minerałów detrytycznych do krzemianów warstwowych/ilastych pochodzenia chemicznego/diagenetycznego/neoformacyjnego. W okresie kredy i trzeciorzędu lokalne lub regionalne zdarzenia geodynamiczne i diagenetyczne w dużej mierze wpływały na procesy sedymentacji skał i różnice w pochodzeniu wśród przedstawicieli formacji Germav.
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