Article
Geosciences, Multidisciplinary
Zhikai Wang, Satish C. Singh, Cecile Prigent, Emma P. M. Gregory, Milena Marjanovic
Summary: Transform faults accommodate lateral motions between lithospheric plates, and this study presents new findings about the deep structure of the Romanche transform fault. The seismic data indicates the presence of a low-velocity anomaly, likely due to extensive serpentinization and a hydrated shear mylonite zone. Water sourced from seawater-derived fluids infiltrates the fault, leading to a low-temperature, water-induced melting zone and thinning of the lithosphere at the transform fault.
Article
Geosciences, Multidisciplinary
Xian Chen, Rui-Zhong Hu, Liang Liu, De-Hui Zhang
Summary: Through analysis of the geochemical, geochronological, and zircon Hf-O isotope compositions of the Cuigang monzogranite, Dongan syenogranite, and Luming monzogranite in the Lesser Xing'an Range of the Songliao Block, it is discovered that these plutons are related to mantle heat and mass, and may be linked to widespread crust-mantle interactions during the Early Jurassic.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Kittiphon Boonma, Daniel Garcia-Castellanos, Ivone Jimenez-Munt, Taras Gerya
Summary: This study uses 3D thermo-mechanical geodynamic modelling to explore the processes of lithospheric slab tearing, and finds that the obliquity of the continental passive margin relative to the subduction trench facilitates the initiation of slab tearing. The model predicts a lateral migration velocity ranging between 38 and 68 cm/yr for the tearing point, resulting in uplift rates of 0.23-2.16 mm/yr above the torn apart areas, depending on mantle viscosity.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Ben-Xun Su, Qi-Qi Pan, Yan Xiao, Jie-Jun Jing, Paul T. Robinson, Ibrahim Uysal, Xia Liu, Jian-Guo Liu
Summary: The traditional interpretation of mantle peridotites in ophiolites needs to be reconsidered as recent petrological and geochemical data suggest significant compositional variations and modifications in these rocks. The presence of interstitial spinel grains and widespread clinopyroxene suggests post-crystallization modifications. Amphibole and enriched Mg and Ca melts/fluids serve as evidence of the past presence of hydrous melts and indicate interactions between different lithologies. The mantle peridotites of ophiolites cannot be considered as paleo-oceanic lithospheric mantle and cannot be used for reconstructing ancient oceans or constraining global tectonic processes.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Fernando Martinez, Richard Hey
Summary: The offset ridge-transform structure of ocean basins is a prominent expression of plate tectonics. This study investigates the reasons for this configuration by analyzing mantle Bouguer anomalies (MBAs). The results show that the pattern of mantle melting plays a crucial role in the formation of transform faults, as the distribution and extent of melting can affect the chemical and rheological properties of the residual mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jianhua Li, Shuwen Dong, Peter A. Cawood, Hans Thybo, Peter D. Clift, Stephen T. Johnston, Guochun Zhao, Yueqiao Zhang
Summary: The wide-mode lithospheric extension in South China is characterized by a transition from a magma-poor to a magma-rich domain, resulting in crustal melting, crust-mantle decoupling, and the formation of Moho uplift associated with mantle shear zones. The strain fields in the South China lithosphere are uniformly oriented in the NW-SE direction, indicating vertically coherent deformation. Slab rollback and mantle flow likely drove the lithospheric extension in South China.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Orhan Karsli, Firat Sengun, Faruk Aydin, Hadi S. Moghadam, Abdurrahman Dokuz, William L. Griffin, Simge Oguz Saka, Thomas Zack
Summary: Turkey's Early Paleozoic tectonic evolution has been the focus of attention. Early Paleozoic intrusive rocks are mainly distributed across Europe, Turkey, and Iran. However, the Early Paleozoic rocks have not yet been identified in north Turkey's Sakarya Zone, and thus the Early Paleozoic paleogeography of the Sakarya Zone remains enigmatic. This study provides new field observations, petrography, geochemistry, and geochronology to identify the nature, origin, and tectonic setting of the Ordovician magmatic rocks in the So center dot gut area (Bilecik, northwest Turkey) in the western Sakarya Zone.
Article
Geosciences, Multidisciplinary
Hannah F. Mark, Douglas A. Wiens, Erik R. Ivins, Andreas Richter, Walid Ben Mansour, M. Beatrice Magnani, Eric Marderwald, Rodrigo Adaros, Sergio Barrientos
Summary: The study reveals a slow velocity anomaly in the uppermost mantle of the Patagonian slab window, suggesting warm mantle temperature, low viscosity, and possible partial melt in the region. This supports the hypothesis of a connection between post-Little Ice Age anthropogenic ice mass loss and rapid glacial isostatic uplift observed geodetically.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Yener Eyuboglu, Francis O. Dudas, Di-Cheng Zhu, Ze Liu, Nilanjan Chatterjee, Kubra Akbulut, Liang-Liang Zhang, Shi-Min Li
Summary: The study focuses on hypabyssal intrusives and xenoliths in the Late Cretaceous to Early Paleocene period in northeastern Turkey, detailing their major and trace element compositions, zircon U-Pb ages, and mineral compositions. The host rocks and xenoliths show similarities and differences in terms of their geochemical signatures, which provide insights into the magmatic processes in the study area.
Article
Geochemistry & Geophysics
Eric L. Brown, Tyrone O. Rooney, Robert Moucha, Seth Stein, Carol A. Stein
Summary: The study investigates the magma generation factors of the Midcontinent Rift in North America by combining mantle potential temperature and lithospheric thickness constraints. It reveals that the early stage of continental flood basalt magmatism was controlled by deep melting and high mantle potential temperatures, followed by a gradual decrease in temperature. Constraints on mantle potential temperature and lithospheric thickness suggest thinning lithosphere and decreasing mantle potential temperatures during the formation of the continental flood basalts.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Omar Bartoli, Bruna B. Carvalho
Summary: Anatectic granites are products of crustal maturation by partial melting, and understanding their origin is crucial for understanding continental crust formation and evolution. This study compares melt compositions obtained from different tools, models the effects of various factors on melt composition, and compares the results with previous studies to verify systematic compositional differences and similarities.
Article
Geochemistry & Geophysics
Kuruvamana Satheeshbabu Sreenidhi, Munukutla Radhakrishna, Peter G. Betts
Summary: This study investigates the variations of lithospheric architecture and extension characteristics in the Red Sea region through the joint interpretation of various data sets. The Red Sea is found to be divided into four segments with different lithospheric features and stretching styles. The results suggest that the evolution of the Red Sea is more complex than previously thought, and different extensional styles can exist within different segments during the initial stages of ocean formation.
Article
Geochemistry & Geophysics
Zheng Tang, Jordi Julia, Walter D. Mooney, Paul Martin Mai, Huazhi Yu, Yanqiang Wu
Summary: We provide a comprehensive image of the mantle transition zone beneath northeastern China, revealing fine-scale topography and lateral variations in thickness and slab interfaces within the zone. The images provide direct evidence for the presence of the stagnant Pacific subducting slab and support previous hypotheses of mantle upwelling triggered by the sinking of the stagnant slab.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Charitra Jain, Antoine B. Rozel, Jeroen van Hunen, Emily J. Chin, Antonio Manjon-Cabeza Cordoba
Summary: Geophysical, geochemical, and geological investigations have linked the stable behavior of Earth's continents to the presence of Archean cratonic roots, likely composed of melt-depleted peridotite. Dynamic models and petrological models offer insights into the formation of cratons, while global thermochemical models driven by gravity demonstrate a self-consistent way for cratonic roots formation to occur naturally.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Hengchu Peng, Jose Badal, Jiafu Hu, Haiyan Yang, Benyu Liu
Summary: The study of the Tengchong volcanic field reveals a significant low-velocity anomaly in the crust, potentially related to the shear wave velocity in the upper mantle of neighboring regions. Analysis of P receiver functions also provides insights into crustal thickness, V-P/N-S ratios, and the depth range of the lithosphere-asthenosphere boundary.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Environmental Sciences
Ayse Yuksekdag, Borte Kose-Mutlu, Bihter Zeytuncu-Gokoglu, Mustafa Kumral, Mark R. Wiesner, Ismail Koyuncu
Summary: The passage discusses how e-waste from discarded electrical and electronic devices is a potential source of rare earth elements, with China dominating global REE production. It also introduces methods for efficient REE recovery from secondary sources like e-waste through improvements in pre-treatment and acidic leaching processes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Geology
Raif Kandemir, Merve Ozyurt, Orhan Karsli
Summary: The Senkoy Formation in the eastern Sakarya Zone of Turkey is a significant unit for understanding the Mesozoic tectonic evolution. Through detailed petrographic and geochemical analysis of sandstone samples, it is suggested that the sediments likely experienced low chemical weathering processes and were deposited in an open sea environment during the Early Jurassic transgressive period. Different geochemical signatures in the sandstone samples indicate varying provenance and source rock contributions, with potential links to ancient magmatic arc generation due to subduction of Palaeotethys.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
Hadi Shafaii Moghadam, Qiu-Li Li, William L. Griffin, Robert J. Stern, Jose F. Santos, Mihai N. Ducea, Chris J. Ottley, Orhan Karsli, Fatemeh Sepidbar, Suzanne Y. O'Reilly
Summary: Continental-arc igneous rock compositions change in response to the transition from subduction to collision, providing insights into the evolution of crust, lithosphere, and magma sources. The Urumieh-Dokhtar Magmatic Belt (UDMB) in Iran offers a natural laboratory to study these changes. Geochemical and geochronological data reveal different stages of magmatic activity, reflecting the processes of subduction, collision, and crustal thickening. The temporal changes in UDMB magmas are related to the response of the overriding plate to changes in the subduction geometry and collision events.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Orhan Karsli, Firat Sengun, Jose Francisco Santos, Ibrahim Uysal, Abdurrahman Dokuz, Faruk Aydin, Raif Kandemir
Summary: This study provides new insights into the Late Jurassic granitic magmatism in the Sakarya Zone in northwestern Turkey. The granitic rocks were likely formed by low degree melting of the eclogitic part of an oceanic slab, followed by magma fractionation and crustal contamination. The findings suggest that the continental back-arc basin system played a significant role in the Late Jurassic tectonic evolution of the Paleotethys Ocean and the western Sakarya Zone.
Article
Geosciences, Multidisciplinary
Abdurrahman Dokuz, Mehmet Ali Gucer, Orhan Karsli, Keewook Yi
Summary: New U-Pb zircon data from the Kurtoglu Massif in Turkey provide insights into the existence of a Cadomian back-arc basin and the closure of the Rheic Ocean. The study suggests that the basement of the Sakarya Zone has a Cadomian affinity and that sedimentation likely occurred prior to the final closure of the Rheic Ocean.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Xia Liu, Ben-Xun Su, Phillip Gopon, Yan Xiao, Ibrahim Uysal
Summary: Compared to magmatic processes, the modification of chromite by low-temperature hydrothermal activities in ophiolites has been less studied. In this study, chromitites from the Bursa ophiolite in NW Turkey were found to be modified by hydrothermal fluids, resulting in the presence of unusual inclusions and intergrowths of magnesite, quartz, chlorite, and ferrian chromite. The infiltration of reducing and SiO2-rich serpentinizing fluids caused changes in the composition of ferrian chromite, while CO2-rich fluids led to carbonation of the serpentine matrix and the formation of interstitial magnesite and quartz. The carbon and oxygen isotope compositions of magnesite indicated that the CO2-rich fluids were derived from decarbonation of local marble and metaclastic rocks.
Review
Geosciences, Multidisciplinary
Hossein Azizi, Robert J. Stern, Raif Kandemir, Orhan Karsli
Summary: The Early to Middle Jurassic stratigraphic sequences of the Sanandaj-Sirjan Zone in Iran and the Sakarya Zone in Turkey, which exhibit similar features, suggest that they formed in a common tectonic setting of an extensional basin. The whole-rock chemistry and Sr-Nd isotope signatures indicate that the mafic melts originated from partial melting of the subcontinental lithosphere. The decompression associated with extension led to the partial melting of spinel-garnet lherzolite and formation of tholeiitic to transitional basaltic magma. The inversion of extensional basins occurred during the Mid-Late Jurassic.
Article
Geosciences, Multidisciplinary
Hikmet Yavuz, Yilmaz Demir, Cem Kasapci, Ibrahim Uysal, Cahit Helvaci
Summary: The Kaymaz gold deposit consists of multiple ore zones and is hosted by serpentinite and high-pressure metamorphic rocks. The first ore stage is characterized by pyrite-I, arsenopyrite, and native gold and silver, whereas the second ore stage is represented by pyrite-II and chalcopyrite. The gold deposit is classified as a silica-listwaenite hosted deposit. Geochemical analysis suggests that gold, silver, and arsenic are derived from the same source, potentially the Kaymaz granite. The presence of clathrate formations in the fluid inclusions of the first stage indicates a possible contribution of nickel from the serpentinites, while the second stage fluid inclusions show a lack of carbonic phase and clathrate formations, suggesting a potential dissolution of cobalt from metabasites by meteoric solutions.
JOURNAL OF ASIAN EARTH SCIENCES-X
(2022)
Article
Geosciences, Multidisciplinary
Ferkan Sipahi, Mehmet Ali Gucer, Abdurrahman Dokuz, Keewook Yi, Abdullah Kaygusuz, Enver Akaryali, Cigdem Saydam Eker, Cuneyt Doruk
Summary: In this study, geochronological and geochemical data from the Dagdibi Pluton in the Sakarya Zone were obtained to understand the source region and petrogenesis of the middle Eocene magmatism. The pluton has been dated to around 45 million years ago and is primarily composed of K-feldspar, plagioclase, quartz, Mg-hornblende/actinolite, Fe-Ti oxides, and small amounts of biotite. The geochemical and isotopic characteristics of the pluton suggest that it originated from a depleted mantle that was metasomatized by fluids during previous subduction events.
GEOLOGICAL MAGAZINE
(2023)
Article
Geology
Yalcin E. Ersoy, Ibrahim Uysal, Osman Candan, Martin R. R. Palmer, Dirk Mueller
Summary: In eastern Anatolia, the Divrigi-Hekimhan Magmatic Province (DHMP) consists of alkaline rock units formed 77-69 million years ago, located to the northwest of the Baskil Arc formed 85-74 million years ago. These rocks are composed of different types, including basaltic, trachytic, and syenitic rocks, with varying mineral compositions. Geochemical analysis indicates that the magmas originated from a shallow asthenospheric mantle source, which had undergone metasomatism due to subduction processes.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Abdurrahman Dokuz, Mehmet Cihat Alcicek, Vahdet Tuncdemir, Raif Kandemir, Emre Aydincakir
Summary: The processes of removal of sediments in the eastern Sakarya Zone, Turkey, from the upper Carboniferous to Permian period were modeled using geochemical data and LA-ICP-MS U-Pb ages from detrital zircons. The geochemistry and ages indicate a felsic provenance and passive margin setting during the deposition of the upper Carboniferous sediments, as well as subduction-related tectonic setting and increasing erosion rate during the deposition of the overlying Hardisi Formation. The deposition of catalcesme sediments in a back-arc basin, separated from Gondwana, and their subsequent migration into a lacustrine setting are highlighted.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Simge Oguz-Saka, Faruk Aydin, Orhan Karsli, Abdurrahman Dokuz, Thomas Aiglsperger, Daniel P. Miggins, Cuneyt Sen, Raif Kandemir, Bilal Sari, Anthony A. P. Koppers
Summary: The eastern Blacksea magmatic arc (EBMA) in the eastern Sakarya Zone (ESZ) provides a valuable opportunity to study the birth of an extensional intra-arc and back-arc settings during the Late Cretaceous. The volcanic activity of the EBMA during the Late Cretaceous occurred in two major phases, characterized by a bimodal distribution of rock types. The geochemical and isotopic data suggest that the volcanic rocks in the EBMA were formed through interactions with mantle metasomatized by slab/sediment-derived fluids and lower crustal materials.
Article
Geochemistry & Geophysics
Orhan Karsli, Firat Sengun, Faruk Aydin, Hadi S. Moghadam, Abdurrahman Dokuz, William L. Griffin, Simge Oguz Saka, Thomas Zack
Summary: Turkey's Early Paleozoic tectonic evolution has been the focus of attention. Early Paleozoic intrusive rocks are mainly distributed across Europe, Turkey, and Iran. However, the Early Paleozoic rocks have not yet been identified in north Turkey's Sakarya Zone, and thus the Early Paleozoic paleogeography of the Sakarya Zone remains enigmatic. This study provides new field observations, petrography, geochemistry, and geochronology to identify the nature, origin, and tectonic setting of the Ordovician magmatic rocks in the So center dot gut area (Bilecik, northwest Turkey) in the western Sakarya Zone.
Article
Geosciences, Multidisciplinary
Ben-Xun Su, Qi-Qi Pan, Yan Xiao, Jie-Jun Jing, Paul T. Robinson, Ibrahim Uysal, Xia Liu, Jian-Guo Liu
Summary: The traditional interpretation of mantle peridotites in ophiolites needs to be reconsidered as recent petrological and geochemical data suggest significant compositional variations and modifications in these rocks. The presence of interstitial spinel grains and widespread clinopyroxene suggests post-crystallization modifications. Amphibole and enriched Mg and Ca melts/fluids serve as evidence of the past presence of hydrous melts and indicate interactions between different lithologies. The mantle peridotites of ophiolites cannot be considered as paleo-oceanic lithospheric mantle and cannot be used for reconstructing ancient oceans or constraining global tectonic processes.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.