Review
Geochemistry & Geophysics
Mirmohammad Miri, Ali A. Sepahi
Summary: Studying high-pressure-low-temperature rocks exposed in Iran can provide valuable information about the history and geodynamics of subduction zones. These rocks formed during the subduction of oceanic lithosphere beneath the Iran microplate and were subsequently exhumed. The mineral assemblages in these rocks provide insights into the peak metamorphism and retrograde conditions, revealing differences in subduction angles between Paleo-Tethys and Neo-Tethys and the development of continental back-arc basins in the Mesozoic.
JOURNAL OF GEODYNAMICS
(2023)
Article
Geochemistry & Geophysics
Jinran Qiao, Jie Dong, Shuguang Song, Chao Wang, Mark B. Allen, Li Su
Summary: Ocean-ridge subduction and induced slab windows play a crucial role in the formation of arc magmatism and growth of crust. A study in Northwestern China found low Sr/Y rhyodacites and associated ophiolites, which were formed through partial melting of normal mid-ocean-ridge basalts and exhibited characteristics of blow-torch effect during ocean-ridge subduction. Harzburgites in the area were similar to abyssal peridotites and formed through the obduction of hot asthenospheric mantle. These findings provide important insights into the petrogenesis of low Sr/Y rhyodacites and shed light on the processes occurring during ridge subduction.
Article
Geochemistry & Geophysics
An-Bo Luo, Jian-Jun Fan, De-You Sun, Hao Wu, Yun-Peng Yu, Bo-Chuan Zhang, Di Shen
Summary: Divergent double subduction (DDS) plays a crucial role in tectonic processes, but its geodynamics remains poorly understood. The study of the Meso-Tethys Ocean in central Tibet provides insights into the evolution of a DDS system. The new data from the Gerze area reveal spatial and compositional variations in ca. 105 Ma magmatism as a response to slab breakoff, confirming the existence of breakoff in the DDS model and emphasizing the complex magmatic response it can cause.
Article
Geology
Wei Wang, Qing-Guo Zhai, Pei-Yuan Hu, Sun-Lin Chung, Yue Tang, Hai-Tao Wang, Zhi-Cai Zhu, Hao Wu, Zhi-Qiang Huang
Summary: Research suggests that adakitic dacite in the Rutog area of western Tibetan Plateau may have been formed due to the northward subduction of the Indus-Yarlung Zangbo oceanic lithosphere, triggering Late Cretaceous magmatism. This finding provides new insights into the geodynamic evolution of the Indus-Yarlung Zangbo Neo-Tethys Ocean.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Review
Geosciences, Multidisciplinary
Santanu Kumar Bhowmik, Aliba Ao, Mayashri Rajkakati
Summary: This study reviewed metamorphic and geochronological data of high-pressure metamorphic rocks from the Nagaland Ophiolite Complex in North-east India and placed them in the tectonic framework of two temporally separate subduction systems. It analyzed metamorphic zonation, facies, and evolutionary paths, linking them to Late Triassic to Middle Jurassic-aged subduction systems. The study also identified two distinct accretionary complexes within the area, likely formed during the Eocene collision of the Indian and Myanmar plates.
GEOLOGICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Michael Broecker, Volker Schenk, Erik. E. Scherer, Joko Soesilo, Jasper Berndt
Summary: The Bantimala Complex in central Indonesia is a significant occurrence of Cretaceous metamorphic rocks. It consists of eclogite and blueschist-bearing sequence as part of an accretionary wedge with a complex internal structure. Zircon U-Pb dating reveals a wide age range for the HP/LT rock suite, indicating multiple episodes of high-pressure/low-temperature metamorphism. Detrital zircon U-Pb data suggest that tectonic stacking of the Bantimala Complex occurred after erosion of exposed Cretaceous basement.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Review
Geology
Fatemeh Sepidbar, Seyed Masoud Homam, Mohamed Zaki Khedr, Robert J. J. Stern, Orhan Karsli
Summary: Several Mesozoic ophiolites in Iran formed in response to Late Cretaceous subduction initiation. They are remnants of Neo-Tethys ocean lithosphere formed during subduction initiation and were emplaced onto the southern flank of Eurasia. Most show SSZ-type geochemical affinity.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Y. Li, R. B. Li, P. T. Robinson, S. B. Yang, J. Zhang, J. S. Yang
Summary: The systematic mapping of the Xigaze ophiolite in South Tibet revealed a nearly intact structure of the ophiolitic sequence, with the identification of a serpentinized shear zone preserved within. The structural and petrological features of the shear zone are similar to detachment faults within modern oceanic core complexes, suggesting formation at a spreading ridge.
Article
Geology
Ramin Samadi, Ghodrat Torabi, Elton Luiz Dantas, Tomoaki Morishita, Hiroshi Kawabata
Summary: This study examines relicts of granitic Gondwanan basement in the northwest of Central-East Iranian Microcontinent, incorporated into an ophiolitic melange. The findings suggest the presence of an Ordovician anatectic granite formed in a syn-collisional setting, with some metamorphic deformation signatures likely developed in the Devonian. The U-Pb zircon ages from this granite are similar to other Ordovician collision-related magmatic events in the CEIM.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Review
Geosciences, Multidisciplinary
Yiming Liu, Sanzhong Li, Qingguo Zhai, Yue Tang, Peiyuan Hu, Runhua Guo, Yongjiang Liu, Yuhua Wang, Shengyao Yu, Huahua Cao, Jie Zhou, Guangzeng Wang
Summary: This study focuses on the significance of Jurassic subduction of the Bangong-Nujiang Tethys Ocean, identifying two stages of northward and southward subduction, indicating a complex geological evolution in the Tibetan Plateau.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Zhen Zhang, Tong Liu, Chuan-Zhou Liu, Chang Zhang, Fu-Yuan Wu
Summary: The mantle peridotites from the Zhagabu ophiolite in Tibet show highly heterogeneous geochemical compositions, which may provide important insights into the evolutionary history of the Neo-Tethys oceanic lithosphere and the dynamics of the mantle. These peridotites represent a valuable window for studying the tectonic evolution of the Neo-Tethys Ocean.
Article
Geosciences, Multidisciplinary
Ruibao Li, XianZhi Pei, Bo Wei, Zuochen Li, Lei Pei, Guochao Chen, Youxin Chen, Chengjun Liu
Summary: The Qingshuiquan-Tatuo ophiolites in the Kunlun Orogen provide important information about the subduction processes of the Proto-Tethys Ocean. The study shows that the ophiolites consist of mantle peridotites, pyroxenites, and gabbros with distinct geochemical characteristics reflecting different tectonic environments and evolutionary histories.
Article
Geochemistry & Geophysics
Regina Holtmann, Jesus Munoz-Montecinos, Samuel Angiboust, Aitor Cambeses, Guillaume Bonnet, Allison Brown, Besim Dragovic, Zeynab Gharamohammadi, Mathieu Rodriguez, Johannes Glodny, Ali Kananian, Philippe Agard
Summary: The Ashin Complex is a Cretaceous paleo-accretionary wedge exposed in southern Iran's Zagros suture zone, consisting of mafic, metasedimentary, and ultramafic lithologies. A high-temperature event is believed to have created peritectic melts associated with restitic garnet-bearing amphibolites. Lu-Hf isotopic dating suggests a crystallization age of 113.10 +/- 0.36 Ma for garnet in amphibolite-facies metasediments, while SHRIMP U-Th-Pb zircon dating indicates a temperature peak age of 104 +/- 1 Ma. The presence of sodic-calcic clinopyroxene, sodic amphibole, Si-rich phengite, titanite overgrowths after rutile, and lawsonite suggests a late static recrystallization event. The melting event indicates a transient, abnormally high thermal gradient and could be attributed to the subduction of a thermal anomaly.
Article
Geosciences, Multidisciplinary
Yiming Liu, Sanzhong Li, Chaoming Xie, M. Santosh, Yongjiang Liu, Yuchao Dong, Bin Wang, Runhua Guo, Xianzhi Cao
Summary: This study focuses on the deformation, metamorphism, and geochronology of key rocks in the Sumdo area of the Tibetan Plateau to understand the tectonic evolution of the Tethys Ocean and the geodynamic mechanism of eclogite exhumation. Two main stages of deformation were identified, associated with different types of eclogites. The spreading of the Bangong-Nujiang and Indus-Yarlung Zangbo Tethys Oceans led to the closure and subduction of the Sumdo Tethys Ocean.
Article
Geosciences, Multidisciplinary
Xiao-Wen Zeng, Ming Wang, Cai Li, Hang Li, Xian-Jin Zeng, Di Shen
Summary: Turbidites from the Asa Ophiolite Melange in Tibet provide critical information about the tectonic history and sediment sources of the region. Detrital zircon ages and mineral compositions suggest a mainly recycled orogen provenance with minor volcanic arc material inputs. The study indicates an Early Cretaceous age for the Asa Formation, with main detrital U-Pb zircon age populations ranging from 170 Ma to 2500 Ma.
GEOSCIENCE FRONTIERS
(2021)
Article
Geochemistry & Geophysics
Michael W. Broadley, Hirochika Sumino, David W. Graham, Ray Burgess, Chris J. Ballentine
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Geochemistry & Geophysics
Amy P. Parker, Patricia L. Clay, Ray Burgess, Helene Balcone-Boissard, Pierre Burckel, Brian O'Driscoll
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
Patricia Clay, Katherine H. Joy, Brian O'Driscoll, Henner Busemann, Lorraine Ruzie-Hamilton, Ray Burgess, Jonathan Fellowes, Bastian Joachim-Mrosko, John Pernet-Fisher, Stanislav Strekopytov, Christopher J. Ballentine
AMERICAN MINERALOGIST
(2020)
Article
Geochemistry & Geophysics
Ray Burgess, Sarah L. Goldsmith, Hirochika Sumino, Jamie D. Gilmour, Bernard Marty, Magali Pujol, Kurt O. Konhauser
AMERICAN MINERALOGIST
(2020)
Article
Geochemistry & Geophysics
Elliot J. Carter, Brian O'Driscoll, Ray Burgess, Patricia L. Clay
Summary: Extreme halogen abundance heterogeneity is observed in the mantle and lower crustal transition zone of the Leka ophiolite in Norway, covering much of the known global range of serpentinite compositions. The coupled analysis of halogens and noble gases in serpentinites reveals insights into the sources of fluids and the relative timing of high- and low-temperature fluid infiltration episodes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Z. Taracsak, D. A. Neave, P. Beaudry, J. Gunnarsson-Robin, R. Burgess, M. Edmonds, S. A. Halldorsson, M-A Longpre, S. Ono, E. Ranta, A. Stefansson, A. Turchyn, M. E. Hartley
Summary: This study investigates matrix effects that arise during sulfur isotope analysis of glasses by SIMS, using over 600 sulfur isotope analyses of nine different glasses. The research reveals a nonlinear correlation between glass sulfur content and IMF, and demonstrates that models incorporating multiple elements can accurately predict instrumental mass fractionation. This highlights the importance of using well-characterized standards with a wide compositional range to calibrate SIMS instruments for sulfur isotope analyses of unknown silicate glasses.
Article
Geochemistry & Geophysics
Lewis Hughes, Simon Cuthbert, Alex Quas-Cohen, Lorraine Ruzie-Hamilton, Alison Pawley, Giles Droop, Ian Lyon, Romain Tartese, Ray Burgess
Summary: This study analyzed ultra-high-pressure eclogites and ultramafites and associated fluid inclusions from the Western Gneiss Region of the Norwegian Caledonides for F, Cl, Br and I. The results indicate efficient fractionation of F from Cl by hydrous mineral crystallization under UHP conditions and heavy halogen ratios higher than modern seawater. There is no correlation between Cl and Br or I, suggesting different behavior of Cl during subduction compared to Br and I.
Article
Geochemistry & Geophysics
A. M. Alvarez-Valero, H. Sumino, R. Burgess, E. Nunez-Guerrero, S. Okumura, J. Borrajo, J. A. Lozano Rodriguez
Summary: The study used the Neogene volcano El Hoyazo in southeastern Spain as a natural laboratory to investigate the behavior of volatile substances during crustal melting processes. By comparing noble gas isotopic compositions in lavas and partially melted crustal xenoliths, the study revealed variations associated with depth and gas degassing, providing new insights into volatile behavior during magma ascent and eruption.
Article
Geochemistry & Geophysics
Stephanie Lohmeier, Bernd Lehmann, Albrecht Schneider, Andrew Hodgkin, Raymond Burgess
Summary: The El Volcan gold project is located in the Maricunga gold belt in northern Chile, with mineralization hosted in altered Miocene porphyry intrusions and lava flows. The ore zones display an evolving magmatic-hydrothermal system with various mineral assemblages, and most gold is submicrometer size found in banded quartz veinlets. The lithogeochemical database shows a pronounced Au-Te-Re signature, indicating a strong hydrothermal system.
Article
Geochemistry & Geophysics
Zoltan Taracsak, Marc-Antoine Longpre, Romain Tartese, Ray Burgess, Marie Edmonds, Margaret E. Hartley
Summary: Recent studies have shown that ocean island basalts (OIBs) contain high levels of carbon, sulfur, and halogens. In El Hierro, Western Canary Islands, magmas with exceptionally high CO2 and sulfur contents have been erupting for centuries. By estimating the oxygen fugacity (fO(2)) and magmatic temperature for El Hierro, along with global mantle potential temperature data, researchers were able to assess the redox and temperature conditions during the early stages of volatile-rich OIB melt evolution. The results indicate highly oxidized magmas and provide insights into the mantle source beneath the Canary Islands.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Elliot J. Carter, Brian O'Driscoll, Ray Burgess, Patricia L. Clay, James Hepworth
Summary: Hydrothermal alteration of oceanic crust plays a significant role in geochemical exchange between the crust and oceans. This study investigates the fluid sources and conditions during hydrothermal alteration in gabbro samples from the Oman Ophiolite. The results suggest that alteration in the lower crust is primarily controlled by major fault structures.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Amy P. Parker, Patricia L. Clay, Alan E. Boudreau, Ray Burgess, Brian O'Driscoll
Summary: The activity of volatile-rich fluids may play a crucial role in the evolution of basaltic magmatic systems and the formation of associated precious metal ore deposits. Evidence suggests the presence of chloride-rich fluids in the economically important Stillwater Complex, which are connected to platinum and palladium mineralization. The study provides data on heavy halogens (chlorine, bromine, and iodine) and natural noble gas isotopes in different rock samples, indicating a shared process and/or distribution in mineral species. The findings suggest that halogens may have been fractionated during the exsolution of a volatile-rich fluid and that the presence of specific minerals in halogen-enriched samples implies derivation from the cooling of the intrusion. The study also suggests the limited role of crustal contamination in the formation of certain rock formations and deposits. The high-halogen contents in the sulfide-bearing J-M Reef and associated lithologies support the influence of fluid-related activity in platinum-group element-reef formation, highlighting the importance of sulfide liquid interaction with halogen-rich fluids in the formation of precious metal ore deposits.
AMERICAN MINERALOGIST
(2022)
Article
Multidisciplinary Sciences
Antonio M. Alvarez-Valero, Hirochika Sumino, Antonio Caracausi, Antonio Polo Sanchez, Ray Burgess, Adelina Geyer, Javier Borrajo, Jose A. Lozano Rodriguez, Helena Albert, Meritxell Aulinas, Elena Nunez-Guerrero
Summary: The study shows that pre-eruptive noble gas signals in Deception Island's volcanic activity are important for eruption forecasting and improving understanding of magmatic dynamics.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Linda A. Kirstein, Kristina J. Walowski, Rosemary E. Jones, Ray Burgess, J. Godfrey Fitton, Jan C. M. De Hoog, Ivan P. Savov, Lara M. Kalnins
Summary: The recycling of material at subduction zones has a significant impact on melt composition and mantle rheology. Ocean island basalts (OIBs) provide samples from different depths in the mantle, which have been influenced by various subduction zone processes and materials. A global dataset of OIB compositions is examined to understand the relationship between silica-saturation, olivine compositions, and halogens in glass and olivine-hosted melt inclusions. The study reveals the importance of carbonated lithosphere and altered oceanic crust as sources of Ti-rich silica-undersaturated melts in OIBs.
JOURNAL OF PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Ray Burgess, Mitsuru Ebihara, Hans Eggenkamp
Summary: This article summarizes some established methods for determining halogen abundances and isotopic ratios and highlights key advances.
