Article
Geology
Marco Chiari, Emilio Saccani, Mensi Prela, Valerio Bortolotti, Marta Marcucci, Atsushi Matsuoka
Summary: This study presents new data on the Jurassic radiolarian assemblages in the sedimentary cover of the Mirdita ophiolites in Albania. The study reveals that the radiolarian fossils indicate a deposition age from the late Bajocian to the early Bathonian in the Western Mirdita ophiolites and from the latest Bajocian to the early Callovian in the Eastern Mirdita ophiolites. These new biostratigraphic ages are consistent with the tectono-magmatic evolution of the Jurassic Neo-Tethys.
Article
Geosciences, Multidisciplinary
Nazanin Sarhadi, Mehdi Rezaei-Kahkhaei, Yuruo Shi, Muriel Erambert, Habibollah Ghasemi
Summary: Based on mineral compositions and U-Pb ages, combined with microstructural observations, the emplacement mechanism of the Garagheh pluton in eastern Iran was deciphered. The pluton consists of granodiorite and biotite granite, showing mylonitic foliation and deformation textures. The sequence of events includes granitic magma crystallization, tectonic control, exhumation, and subsequent emplacement of granodiorite. The solid-state deformation at moderate-temperature and low-temperature fabrics suggest a syntectonic cooling process for the pluton.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Emo Marton, Marinko Toljic, Vesna Cvetkov
Summary: The Vardar Zone in the Balkans is formed by a series of geological processes, including the opening of the Neotethys, obduction, consumption of the oceanic crust, and continental collision. Recent studies have found that the Vardar Zone underwent a clockwise rotation of about 30 degrees between 23 and 18 million years ago, related to tectonic extension. The compression of the zone resulted in the formation of a nappe pile. This geological model provides a plausible explanation for the paleomagnetic directions observed in the Central Vardar Zone.
JOURNAL OF GEODYNAMICS
(2022)
Article
Geochemistry & Geophysics
Weiwei Wu, Jingsui Yang, Jianping Zheng, Dongyang Lian, Ibrahim Milushi, Yu Yang, Tian Qiu, Huichao Rui, Guolin Guo, Zhihui Dai, Ahmed Elsaid Ismail Masoud
Summary: This study investigates the mantle-melt evolution processes during the earliest stage of subduction initiation using the Gomsiqe massif in the Mirdita ophiolite. The results show transitions in petrological and geochemical signatures and provide insights into the physicochemical responses of subduction initiation.
Article
Geosciences, Multidisciplinary
Athokpam Krishnakanta Singh, Amrita Dutt, Bibhuranjan Nayak, Raj Kumar Bikramaditya, Govind Oinam, Satyajeet S. Thakur, Rajesh K. Srivastava, Shoraisam Khogenkumar, Manoj Kumar
Summary: The Tidding-Mayodia ophiolites in the eastern Himalaya consist of depleted harzburgite and dunite, with highly fractionated LREEs compared to HREEs. Chemical analysis suggests that these peridotites formed from around 22% partial melting of a depleted spinet lherzolite source and interactions with high-temperature melts and low-temperature fluids, indicating a complex tectonic history involving subduction and forearc processes.
GEOLOGICAL JOURNAL
(2022)
Article
Geochemistry & Geophysics
Yuxiao Chen, Ying Cui, Lipeng Zhang, Shanming Fu, Kai Wu, Shuguang Song, Weidong Sun, Tangfu Xiao
Summary: Deciphering the contribution of slab melt to arc igneous rocks in orogenic belts is essential for understanding subducted slabs, adakite petrogenesis, and geochemical recycling process. The study of the Leigongshan tonalite pluton in the North Qilian suture zone reveals geochemical similarities with low-Mg adakitic rocks, suggesting limited mantle interaction. The presence of old cores and the involvement of subducted sediments provide insights into the petrogenesis of the tonalite.
Article
Geochemistry & Geophysics
El Hachemi Boukaoud, Gaston Godard, Moulley Charaf Chabou, Youcef Bouftouha, SidAli Doukkari
Summary: This study presents detailed geochemical, mineralogical, and petrological data on mafic and ultramafic rocks in the Texenna area, revealing their tectonic setting and rock characteristics. The results indicate that the rock complex in Texenna belongs to a typical ophiolitic slice and shares similarities with many ophiolites in the Western Mediterranean region.
Article
Geosciences, Multidisciplinary
Gianni Balestro, Andrea Festa, Sara De Caroli, Edoardo Barbero, Alessandro Borghi, Franco Gianotti
Summary: The Canavese Intracontinental Suture Zone (CISZ) in the Inner Western Alps represents a significant tectonic feature that played a role in the tectonic evolution of the region. Through detailed study of its geological characteristics, the late Paleozoic to late Cenozoic tectonic evolution of the CISZ can be understood, shedding light on the tectonic history of metamorphic orogenic belts around the world.
GEOSCIENCE FRONTIERS
(2022)
Article
Geology
Valentina Brombin, Edoardo Barbero, Emilio Saccani, Nicola Precisvalle, Sonja Lepitkova, Ivica Milevski, Igor Ristovski, Igor Milcov, Gorgi Dimov, Gianluca Bianchini
Summary: This study investigated the composition and isotopic signatures of rocks from the Vardar ophiolites in North Macedonia, finding that the C and S contents and isotopic ratios of these rocks differ from typical mantle and mid-ocean ridge melts, suggesting the involvement of subduction-related components in the petrogenesis.
Article
Geochemistry & Geophysics
Celine Martin, Kennet E. Flores, George E. Harlow, Samuel Angiboust, Florent Hodel, George L. Guice
Summary: This study investigates the fluid sources recorded in ophiolitic serpentinites using B isotopic geochemistry. The results suggest that the B isotope values in serpentinites can reflect the fluid sources, with samples from Brazil indicating serpentinization by seawater, and samples from Guatemala and Iran indicating serpentinization by subducted crust-derived metamorphic fluids.
Article
Geosciences, Multidisciplinary
Tong Liu, Chuanzhou Liu, Fuyuan Wu, Wenbin Ji, Chang Zhang, Weiqi Zhang, Zhenyu Zhang
Summary: The evolution and closure of the Neo-Tethys Ocean are significant geological events that have occurred on Earth. However, the details of its evolution, such as the timing and mechanism of its opening, are still debated. In this study, the authors analyzed mafic igneous rocks in melanges along the Yarlung Zangbo suture zone in Tibet, and obtained geochronological and geochemical data to provide insights into the opening of the Neo-Tethys Ocean. The results indicate that the opening of the Neo-Tethys Ocean occurred in the Late Permian-Middle Triassic, and a mantle plume was not involved in the process. Additionally, the authors identified OIB-like basaltic rocks in the eastern segment, which may be related to continental rifting in the Middle-Late Jurassic. This study contributes to our understanding of the evolution and geodynamics of the Yarlung Zangbo Neo-Tethys Ocean.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geology
Irfan. M. M. Bhat, H. Chauhan, T. Ahmad, Reyaz. A. A. Dar
Summary: The Indus Suture Zone contains ophiolitic remnants of the Neo-Tethys Ocean in eastern part. These remnants are exposed in western Ladakh along the Khangral-Chiktan and Dras-Kargil road sections. The rocks observed include ultramafic-mafic cumulates, gabbros, and faulted volcanic blocks. Geochemically, these rocks exhibit sub-alkaline tholeiitic characteristics. They also show subduction-related geochemical features such as enriched LILE and depleted HFSE compared to the primitive mantle. The presence of Mg-rich olivines, orthopyroxenes, and clinopyroxenes in the ultramafic-mafic cumulates indicates their derivation from previously depleted mantle sources.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geography, Physical
Tea Kolar-Jurkovsek, Hazim Hrvatovic, Dunja Aljinovic, Galina P. Nestell, Bogdan Jurkovsek, Ferid Skopljak
Summary: This study examined the sedimentology and micropaleontology of the Teoc?ak section in Bosnia and Herzegovina, revealing the presence of Permian and Triassic strata in the region. The findings include insights into the depositional environment, conodont faunas, and proposed conodont biozonation, which contributes significantly to the paleobiogeographic correlation of the Western Tethys region.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geochemistry & Geophysics
Craig R. Martin, Oliver Jagoutz, Rajeev Upadhyay, Jill A. van Tongeren, Paul A. Mueller, Benjamin P. Weiss
Summary: The India-Eurasia collision is an important case study for understanding the impact of plate tectonic processes on Earth. However, the timing of this collision is still debated. This study presents paleomagnetic results that provide insights into the position of the Karakoram terrane in northwest India during the Late-Cretaceous. The results suggest that the final India-Eurasia collision likely occurred after the closure of the oceanic basin between the Karakoram terrane and Eurasia.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Uros Stojadinovic, Nemanja Krstekani, Liviu Matenco, Tamara Bogdanovi
Summary: One key element in the current debate analyzing the Central Mediterranean evolution is the Cretaceous structure and kinematics of the oroclinal bent contact between Adria- and Europe-derived continental units in the Dinarides. Our study provides a solution to this debate by analyzing the structural and kinematic history in a key area of central Serbia. The results show that large-scale thrusting deformed the accretionary wedge-trench sediments during the Late Cretaceous subduction of the Neotethys Ocean and the subsequent Adria-Europe collision.
