Magnetostratigraphy of the Pikermian fauna-bearing late Miocene Sivas Basin (central Anatolia, Turkey): fluvio-lacustrine sedimentation under stable climatic conditions across the Tortonian-Messinian boundary

2021 ◽  
Author(s):  
Maud J.M. Meijers ◽  
Ferhat Kaya ◽  
Ahmet A. Peynircioğlu ◽  
Faysal Bibi ◽  
Cesur Pehlevan ◽  
...  
Keyword(s):  
Late Miocene ◽  
Climatic Conditions ◽  
Central Anatolia ◽  
Lacustrine Sedimentation ◽  
Sivas Basin

Genesis of Late Miocene-Pliocene lacustrine palygorskite and calcretes from Kırşehir, central Anatolia, Turkey

Clay Minerals ◽  
2014 ◽  
Vol 49 (3) ◽  
pp. 473-494 ◽  
Author(s):  
S. Kadİr ◽  
M. Eren ◽  
T. Külah ◽  
N. Önalgİl ◽  
M. Cesur ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Late Miocene ◽  
Meteoric Water ◽  
Chemical Elements ◽  
Amorphous Material ◽  
Climatic Conditions ◽  
Central Anatolia ◽  
Heavy Rare Earth Elements ◽  
Host Rocks

AbstractThis paper addresses the mineralogy, geochemistry, and genesis of palygorskite and associated calcretes in the Kırşehir region. In this area, the Quaternary calcretes are present within and/or on lacustrine mudstones of the Kızılırmak Formation (Late Miocene-Pliocene). The calcretes occur in the form of nodules, tubes, fracture-infills, and hard laminated crusts (hardpans). Calcrete samples are predominantly composed of calcite associated with smectite, quartz, feldspar, and minor palygorskite. The lacustrine mudstone samples consist mainly of smectite and palygorskite with minor calcite, quartz, feldspar, illite, kaolinite and amorphous material. Petrographic studies revealed that the calcrete samples are predominantly micrites that were partially converted to microsparites by recrystallization. Scanning and transmission electron microscopy images indicate that palygorskite fibres formed authigenically on and between calcite rhombs in the calcrete samples and at the edges of smectite flakes of host rocks adjacent to the calcretes. The oxygen and hydrogen stable isotope values of the calcite suggest that it precipitated from meteoric water under arid or seasonally arid climatic conditions. Calcite precipitation occurred in the vadose zone, as evidenced by desiccation cracks and vadose pisolites. The enrichment of Rb+Ba±Sr and Light Rare Earth Elements (LREE) relative to Heavy Rare Earth Elements (HREE)with a distinct negative Eu anomaly are responses to the fractionation of volcanogenic feldspar and hornblende under the influence of meteoric water. The palygorskite associated with calcretes was precipitated from alkaline water rich in Si, Al and Fe and low in Mg. The palygorskite precipitation occurred at increased temperatures, characterising the advanced stage of calcrete formation which lowers the Ca content in the soil water. The required chemical elements for palygorskite and calcite were most likely derived from the dissolution of smectitic clays, ignimbrites and carbonate minerals.

Late Miocene−early Pliocene rodents and lagomorphs (Mammalia) from the southern part of Çankırı Basin, Turkey

2018 ◽  
Vol 93 (1) ◽  
pp. 173-195 ◽  
Author(s):  
Sevket Sen ◽  
Levent Karadenizli ◽  
Pierre-Olivier Antoine ◽  
Gerçek Saraç
Keyword(s):  
Late Miocene ◽  
Central Anatolia ◽  
Large Species ◽  
Southern Europe ◽  
Early Pliocene ◽  
Muroid Rodents

AbstractThree localities in the Çankırı Basin—Kale Tepe 1 (KT1), Kale Tepe 2 (KT2), and Mahmutlar—yielded reliably documented rodent and lagomorph assemblages. These are in the Akkaşdağı Formation, which covers large areas in the central and southern parts of this basin in Central Anatolia. The widening of the Kirikkale-Çorum highway produced fresh outcrops that allowed for the discovery of fossiliferous levels in a well-controlled stratigraphy. The assemblages from all three localities are dominated by muroid rodents (Apodemus gorafensisRuiz Bustos et al., 1984;A. gudrunaevan de Weerd, 1976;A. dominansKretzoi, 1959;Micromyssp. indet.;Allocricetussp. indet.;Pseudomerionessp. indet.; Cricetidae gen. indet. sp. indet.;Mimomyssp. indet.) in addition to a glirid (Dryomimuscf.D. eliomyoidesKretzoi, 1959), an eomyid (Keramidomysaff.K. ermannorumDaxner-Höck and Höck, 2009), two ochotonids (Prolagus sorbiniiMasini, 1989;Ochotonomasp. indet.) and one leporid. KT1 and KT2 yielded two large species ofApodemus(A. gorafensis;A. gudrunae) that are typical for the late Miocene/early Pliocene transition in southern Europe, and they are known in Greece and Turkey in localities dated to the latest Miocene, i.e., MN 13 mammalian zone. The occurrence ofA. dominansand a rooted arvicolid similar toMimomys davakosivan de Weerd, 1979 suggests correlation of Mahmutlar to the early Pliocene, or early MN 15 zone. An abundance of muroid rodents in these assemblages indicates woodlands and areas covered by grasses and shrubs, whereas early Pliocene deposits at Mahmutlar provided pollen of abundant herbaceous and shrub elements. Most rodents and lagomorphs from Kale Tepe and Mahmutlar are known in southern European bioprovinces, whereas some elements (PseudomerionesSchaub, 1934;OchotonomaSen, 1998) indicate Asiatic affinities.

Tectonic Setting and Evolution of the Sivas Basin, Central Anatolia, Turkey

1996 ◽  
Vol 38 (9) ◽  
pp. 838-853 ◽  
Author(s):  
A. Poisson ◽  
J. C. Guezou ◽  
A. Ozturk ◽  
S. Inan ◽  
H. Temiz ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Central Anatolia ◽  
Sivas Basin

The micromammal fauna from Negratín-1 (Guadix Basin, southern Spain): new evidence of African-Iberian mammal exchanges during the Late Miocene

2009 ◽  
Vol 83 (6) ◽  
pp. 854-879 ◽  
Author(s):  
Raef Minwer-Bararat ◽  
Antonio García-Alix ◽  
Jordi Agustí ◽  
Elvira Martín Suárez ◽  
Matthijs Freudenthal
Keyword(s):  
North Africa ◽  
Late Miocene ◽  
Climatic Conditions ◽  
Southern Spain ◽  
Messinian Salinity Crisis ◽  
African Origin ◽  
Mammal Fauna ◽  
Faunal List ◽  
First Time ◽  
New Evidence

A rich and diverse micromammal fauna from the late Turolian (MN13) locality of Negratín-1 (Guadix Basin, southern Spain) is described. The faunal list of this site includes Apodemus gudrunae, Occitanomys alcalai, Stephanomys dubari, Paraethomys meini, Myocricetodon jaegeri, Debruijnimys almenarensis, Apocricetus alberti, Ruscinomys sp., Eliomys sp., Atlantoxerus sp., Parasorex ibericus, and Soricidae indet. This is the most nearly complete mammal fauna from the Miocene of the Guadix Basin and allows precise correlations with localities from other Iberian areas. In addition, some of the taxa identified in Negratín-1 are useful as palaeoecological indicators (Myocricetodon, Debruijnimys, Atlantoxerus), evidencing warm and dry climatic conditions. But the principal interest of the fauna from Negratín-1 is the presence of several species of African origin, the gerbillids Debruijnimys almenarensis and Myocricetodon jaegeri, which are recognized for the first time in Europe. We also ascribe to M. jaegeri the population from the upper Turolian karst infilling of Almenara-M. This finding constitutes new evidence for faunal exchanges between North Africa and the Iberian Peninsula during the Messinian Salinity Crisis.

scholarly journals The late Miocene Öksüt high sulfidation epithermal Au-Cu deposit, Central Anatolia, Turkey: Geology, geochronology, and geochemistry

2020 ◽  
Vol 126 ◽  
pp. 103795
Author(s):  
Ali Aluç ◽  
İlkay Kuşcu ◽  
Irena Peytcheva ◽  
Mustafa Cihan ◽  
Albrecht von Quadt
Keyword(s):  
Late Miocene ◽  
Central Anatolia ◽  
High Sulfidation ◽  
Epithermal Au
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