Article
Geochemistry & Geophysics
Hadi Shafaii Moghadam, Robert J. Stern
Summary: Subduction initiation leads to plate sinking and extensional stress on the overriding plate. The Late Cretaceous forearc ophiolites in Iran demonstrate that subduction initiation can cause strong extension over a wider region than previously thought.
Article
Paleontology
Liubov Bragina, Polina Proshina, Nikita Bragin, Efthymios Tsiolakis, Vasilis Symeou, Nikolaos Papadimitriou
Summary: This study provides significant insights into the Upper Cretaceous stratigraphy of southwestern Cyprus through the analysis of radiolarians and planktonic foraminifers from continuous outcrops.
Article
Geochemistry & Geophysics
Cesar R. Navarrete, Gabriela Massaferro, Guido A. Gianni, Maria Belen Lastra
Summary: The study focuses on the petrogenesis of the Late Cretaceous-Paleocene Las Mercedes basalt in southern Patagonia, which is the only intraplate magmatic unit in the region. It suggests that the origin of this basaltic unit is related to the opening of a trench-perpendicular slab tear of the Aluk subducting plate, inducing decompression melting and extrusion of basalts. Slab tearing and changes in subduction angles have also been identified as key factors influencing the anomalous occurrence of intraplate magmatism in the region.
JOURNAL OF GEODYNAMICS
(2021)
Article
Geochemistry & Geophysics
Ding-Jun Wen, Xiumian Hu, Timothy Chapman, Gang Zeng, An-Lin Ma, Rui-Qiang Wang
Summary: Based on the analysis of rock elements and isotopic data of the Duoma volcanic rocks in the central Tibet's southern Qiangtang region, the researchers found that these volcanic rocks have different origins and sources. The basalts may have originated from the partial melting of garnet clinopyroxenite, while the rhyolites may have come from the partial melting of the lower continental crust. This indicates that the formation of Late Cretaceous volcanism may be related to lithospheric delamination beneath the southern Qiangtang region.
Article
Geology
Wenchao Yu, Giacomo Oggiano, Giovanni Mongelli, Jintao Zhou, Roberto Buccione, Lingtong Xu, Paola Mameli, Yuansheng Du
Summary: Bauxite deposits in Italy are mainly found in the Sardinia and Adria regions within Cretaceous carbonate sequences. The parental affinity of these deposits has long been disputed, with four potential sources proposed. This study analyzed the detrital zircon U-Pb ages and Hf isotope values of Cretaceous bauxites in these regions, along with published geochemical data, to discuss their provenances. The results showed that the bauxite deposits in Sardinia originated from the Variscan metasedimentary basement, while those in Adria were mainly supplied by coeval volcanic materials.
ORE GEOLOGY REVIEWS
(2023)
Article
Environmental Sciences
Vikki Lowe, Giuseppe Cortese, Kelly-Anne Lawler, Matthieu Civel-Mazens, Helen C. Bostock
Summary: The Southern Ocean is an important region for identifying ecoregions, and this study used the Southern Ocean Radiolarian Dataset to determine the radiolarian ecoregions in the Atlantic, Indian, and Southwest Pacific Sectors. The distribution of radiolarian species was found to be heterogeneous throughout the Southern Ocean, with each sector having its own unique group of ecoregions. This study highlights the importance of further exploring radiolarian ecology and being cautious when using radiolarian assemblage variability in paleo-environmental studies.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Guohui Chen, Alastair H. F. Robertson
Summary: Late Cretaceous and Paleogene volcanic rocks in the Kyrenia Range of North Cyprus consist of felsic and basaltic rocks, each with distinct geological and chemical characteristics. These rocks are inferred to have formed during stages of development of the active continental margin in the Northern Neotethys.
Article
Geosciences, Multidisciplinary
Stephen C. Dobbs, Matthew A. Malkowski, Theresa M. Schwartz, Zachary T. Sickmann, Stephan A. Graham
Summary: Understanding the redistribution and sequestration of sediment within a sedimentary system is crucial for interpreting basin-scale provenance trends. This study examines how changes in sedimentation processes across a dispersal pathway can result in contrasting provenance signatures. The results show a shift in detrital zircon provenance signatures correlated with lithofacies patterns from different depositional environments. These findings highlight the importance of considering both temporal changes and variation in sedimentation processes when studying provenance in sedimentary systems.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Andrzej Urbaniec, Anna Laba-Biel, Anna Kwietniak, Imoleayo Fashagba
Summary: This study focuses on the poorly recognized Upper Cretaceous complex in the central part of the Carpathian Foreland, using seismic data and seismic sequence stratigraphy to analyze the depositional architecture and identify tectonostratigraphic units. The research fills a gap in the knowledge of paleogeography and explores the impact of eustatic and tectonic factors on sedimentation processes in the Late Cretaceous basin of the Carpathian Foreland.
Article
Geology
Melek Ural, Kaan Sayit, Ugur Kagan Tekin
Summary: Research shows that the Late Cretaceous Yuksekova lavas formed in an oceanic back-arc basin in the Southern Neotethys, with specific characteristics in terms of source and petrogenesis.
Article
Geosciences, Multidisciplinary
Melek Ural, Kaan Sayit, Osman Ersin Koralay, Mehmet Cemal Goncuoglu
Summary: During the Late Cretaceous in the Eastern Mediterranean, the closure of the northern branch of the southern Neotethys was caused by multiple northward subductions. This resulted in the formation of the Baskil continental arc and the Yuksekova Complex, representing different tectonic settings and sources.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2021)
Article
Geography, Physical
M. Civel-Mazens, X. Crosta, G. Cortese, E. Michel, A. Mazaud, O. Ther, M. Ikehara, T. Itaki
Summary: In the Southern Ocean, climate-driven latitudinal migrations of the Antarctic Circumpolar Current frontal system impact ocean circulation and primary productivity. The Antarctic Polar Front's migrations influence nutrient redistribution, biodiversity, and the soft tissue carbon pump in the modern Southern Ocean.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Hossein Azizi, Motohiro Tsuboi
Summary: Magmatic activity in northwestern Iran occurred during three main intervals, with the last phase showing similarities to postcollisional magmatism. The Van microplate and surrounding ocean played a crucial role in the evolution of magmatic activity in the region since the Cretaceous.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Paleontology
Xiao-Hui Cui, Xin Li, Jonathan C. Aitchison, Atsushi Matsuoka, Hui Luo
Summary: This study presents the identification of radiolarian assemblages from chert clasts in the Liuqu and Gangrinboche conglomerates in southern Tibet. The radiolarian fossils suggest that the chert clasts were derived from the Bainang terrane, indicating the exposure and erosion of Early Cretaceous accretionary complexes before deposition in the Cenozoic conglomerates.
Article
Geology
Nicolas R. Chimento, Federico L. Agnolin, Takanobu Tsuihiji, Makoto Manabe, Fernando E. Novas
Summary: This study describes gondwanatherian mammaliaforms from the Chorrillo Formation in Patagonia, Argentina, expanding our knowledge of this species.
CRETACEOUS RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Abdullah Kaygusuz, Mehmet Arslan, Irfan Temizel, Cem Yucel, Emre Aydincakir
Summary: This study provides new insights into the igneous activity and geodynamic evolution of the Late Cretaceous era in the north part of the Eastern Pontides Orogenic Belt (EPOB) through the analysis of mineralogy, petrology, geochronology, and isotope geochemistry of the Arpakoy and Oyman granitoids. The results indicate specific petrological characteristics and emplacement depths of these granitoids, with the parental magma originating from an enriched lithospheric mantle.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Melek Ural, Kaan Sayit, Osman Ersin Koralay, Mehmet Cemal Goncuoglu
Summary: During the Late Cretaceous in the Eastern Mediterranean, the closure of the northern branch of the southern Neotethys was caused by multiple northward subductions. This resulted in the formation of the Baskil continental arc and the Yuksekova Complex, representing different tectonic settings and sources.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2021)
Article
Geosciences, Multidisciplinary
Omer Bozkaya, Asuman Gunal-Turkmenoglu, Mehmet Cemal Goncuoglu, Cengiz Okuyucu
Summary: The study identified K-bentonite layers in the south of Aksehir, Turkey, showing characteristics of volcanic origin with illite and various non-clay minerals, reflecting high-temperature diagenetic conditions. A comparison with K-bentonites from other regions reveals geological and geochemical differences in these studied K-bentonites.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Mehmet Arslan, Irfan Temizel, Lukas Ackerman, Cem Yucel, Emel Abdioglu Yazar
Summary: The Cenozoic volcanic rocks from the Eastern Pontides Orogenic Belt in NE Turkey exhibit a wide range of variation in highly siderophile element (HSE) contents and Os isotope compositions, which are related to their mantle sources and magma evolution. Crustal assimilation played an important role in the evolution of the Eocene and Miocene volcanic rocks.
Article
Geosciences, Multidisciplinary
Semih Gursu, Serhat Koksal, Andreas Moeller, George D. Kamenov, M. Cemal Goncuoglu, Kevin Hefferan, Paul A. Mueller, Huseyin Kozlu
Summary: The detrital U-Pb age peaks and Lu-Hf systematics of peri-Gondwanan units in southern Turkey suggest their derivation from Neoproterozoic igneous suites in the Sinai Peninsula, Israel, and the Eastern Desert. These sediments were likely derived from sedimentary recycling processes in a continental back-arc tectonic setting. The provenance of the sediments correlates with nearby regions such as the Nubian Shield and Saharan Metacraton.
Article
Geosciences, Multidisciplinary
Cafer Ozkul, Irfan Temizel, Muzaffer Ozburan, Mehmet Arslan, Yasar Kibici
Summary: The first geochronological and geochemical data of the Kutahya area volcanics in western Turkey were presented to study mantle sources and magmatic processes. The results suggest that these volcanics underwent a series of complex magmatic evolution processes.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Irfan Temizel, Mehmet Arslan, Emel Abdioglu Yazar, Zafer Aslan, Abdullah Kaygusuz, Tugba Baki Eraydin
Summary: The study of mafic intrusions in the Eastern Pontides Orogenic Belt in NE Turkey reveals the presence of rare tholeiitic gabbro stocks with varying compositions, indicating a connection to continental or oceanic crust.
Article
Geology
Cem Yucel, Emre Aydincakir, Abdullah Kaygusuz, Mehmet Arslan, Keewook Yi, Youn-Joong Jeong, Derya Cicerali
Summary: The Late Cretaceous magmatic activity in the Eastern Pontides Orogenic Belt of NE Turkey was characterized by the intrusion of I-type and A-type plutons. A-type plutons from the Sebinkarahisar area, with ages of approximately 77.36 +/- 0.96 Ma, display characteristics of enrichment in K2O and Na2O, Ga, Zr, and strong negative Eu anomalies. These plutons were formed in an extensional tectonic environment and were sourced from a metasomatized lithospheric mantle and juvenile crust.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Mehmet Arslan, Irfan Temizel
Summary: The post-collisional Cenozoic basic volcanic rocks in NE Turkey show temporal variations in whole-rock lithophile element and highly siderophile element (HSE) systematics that are mainly associated with the nature of sub-continental lithospheric mantle (SCLM) sources and parental melt generation. The lithophile element and HSE geochemical data reveal the heterogeneity of the SCLM source, the influence of previous subduction and post-collisional interactions, and the impact of crustal contamination on the volcanic rocks.
Article
Geology
Irfan Temizel, Mehmet Arslan
Summary: Through the study of monzonitic plutons in northeastern Turkey, we found that they were formed during the Middle Eocene and belong to I-type shoshonitic magmas. They were mainly derived from the sub-continental lithospheric mantle and crustal components, and underwent fractional crystallization in the crustal levels.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Engineering, Multidisciplinary
Melek Ural, Metehan Alparslan Aktas
Summary: This study comparatively examines the physical and morphological characteristics of Late Cretaceous Yuksekova Complex's pillow lavas in different mountains around Elazig. The findings suggest that pillow lavas in Celemelik, Asker, and Maden mountains are the most flattened and coarse-sized, indicating their formation in a submarine environment with steep topography and low viscosity lava flows.
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
(2023)
Article
Geology
Melek Ural, Kaan Sayit, Ugur Kagan Tekin
Summary: Research shows that the Late Cretaceous Yuksekova lavas formed in an oceanic back-arc basin in the Southern Neotethys, with specific characteristics in terms of source and petrogenesis.
Article
Geosciences, Multidisciplinary
Mehmet Arslan, Irfan Temizel, Emel Abdioglu Yazar, Bahrican Ar, Cem Yucel
Summary: The highly siderophile element and Os isotope systematics of basalts have recently received significant attention in petrological studies due to their potential in constraining magma generation and evolution processes. The data obtained from modern techniques are used to analyze the HSE contents and ratios in basalts, which provide opportunities for geochemical modeling. The HSE contents and Pd-PGE/Ir-PGE ratios are important indicators for various geological processes in the origin and evolution of mantle-derived magmas.
BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION
(2022)
Article
Geology
Kaan Sayit, M. Cemal Goncuoglu, Alessandro Ellero, Giuseppe Ottria, Chiara Frassi, Michele Marroni, Luca Pandolfi
Summary: In the southern Central Pontides in northern Turkey, Late Cretaceous magmatic units, including the Yerkuyu Unit and the Tafano Unit, with different tectono-magmatic characteristics, are discovered through the study of the North Anatolian Shear Zone. It is inferred that the subduction of the Izmir-Ankara-Erzincan branch of the Neotethys Ocean resulted in different types of magmatism.
