Article
Geochemistry & Geophysics
Yu-Xiang Zhu, Lian-Xun Wang, Nimat Ullah Khattak, Chang-Qian Ma, Gen-Ming Luo, Thomas Ulrich
Summary: The Sillai Patti carbonatite complex in Pakistan is the second largest of its kind, but its origin and geodynamic settings are not well understood. A comprehensive investigation was conducted, including mineral composition, dating, geochemistry, and isotopic studies. The results suggest that the Sillai Patti carbonatite formed in an intra-continental rift setting, with considerable potential for rare earth elements (REEs) and Nb mineralization. The isotopic compositions indicate derivation from an enriched sub-continental lithospheric mantle source.
Article
Geochemistry & Geophysics
Tiffany A. Rivera, Craig M. White, Mark D. Schmitz, Brian R. Jicha
Summary: The study of Pleistocene basalts in the Western Snake River Plain reveals a complex petrogenesis involving multiple magma sources and interactions with ancient crustal rocks, shedding light on the nature of the lithosphere at depth in the Earth. Different types of basalts interact with ascending magmas and old crustal rocks, delineating the evolutionary history of different parts of the North American lithosphere.
JOURNAL OF PETROLOGY
(2021)
Article
Geology
Zehua Guo, Zenghui Yu, Ke Wang, Shikui Zhai, Huaijing Zhang
Summary: The Okinawa Trough is a natural laboratory for studying basin evolution, magmatism, and crust-mantle interactions. Magmas in the Middle Okinawa Trough and Southern Okinawa Trough are mainly occurring. To investigate the magmatism in the Okinawa Trough, volcanic rock samples from the MOT and SOT were analysed for Fe - Sr - Nd - Pb - Hf isotopic compositions.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Josua J. Pakulla, Mike W. Jansen, Raymond A. Duraiswami, Purva Gadpallu, Jonas Tusch, Carsten Jentzsch, Ninja Braukmueller, Frank Wombacher, Carsten Muenker
Summary: The Deccan Volcanic Province (DVP) in India, which covers a large area, has recorded about five million years of volcanic activity. Previous studies have shown that DVP basalt has a common isotopic signature, which is best explained by a mixture of early Reunion plume-related melts and depleted upper mantle melts. This new study provides further insight into the DVP's magma-plumbing system and suggests that it may be more complex than previously thought.
Article
Geology
Qiang Weng, Wu-Bin Yang, He-Cai Niu, Ning-Bo Li, Pan Qu, Qiang Shan, Guo-Qiang Fan, Zhao-Yong Jiang, Ze-Yang Zhang, Ao Li, Xiao-Chen Zhao
Summary: The origin of the Maoniuping complex was determined through B-Sr-Nd-Pb isotopic data, showing that the alkaline syenite was derived from partial melting of a fertile mantle source and was influenced by carbonatitic melts/fluids from marine sediments and altered oceanic crust within the subducting Indian slab. This study also suggests that hybridization in the mantle source may have been induced by the input of marine sediments from subduction, with boron isotopes serving as a novel indicator of deep recycling of subducted crustal materials in alkaline magma sources.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Francisco E. Apen, Corey J. Wall, John M. Cottle, Mark D. Schmitz, Andrew R. C. Kylander-Clark, Gareth G. E. Seward
Summary: This study analyzed the U-Pb, Sm-Nd, and Sr isotopes of two potential apatite reference materials (RMs) using isotope dilution and laser ablation techniques. One RM was found to be suitable for U-Pb, Sm-Nd, and Sr measurements, while the other was found to be suitable for Sm-Nd measurements. These findings provide new reference standards for in situ apatite chemical analyses and inter-laboratory calibrations.
Article
Geochemistry & Geophysics
Yang Sun, Fang-Zhen Teng, Kwan-Nang Pang, Ji-Feng Ying, Scott Kuehner
Summary: The study investigates the origin of EMI reservoir by analyzing the isotopic compositions of lamproites from Leucite Hills, Wyoming, USA, finding that at least two metasomatic events occurred in their mantle sources. The early metasomatic event led to the formation of EMI Sr-Nd-Pb isotopic signatures, while the recent carbonate metasomatism produced the light Mg isotopic signature and diluted the EMI Sr-Nd-Pb isotopic signatures. This study suggests that a combination of Mg and Sr-Nd-Pb isotopes could be an effective tool in deciphering multiple-stage metasomatic events in mantle sources.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geology
Qin Ye, Hanjie Wen, Chongguang Luo, Yu Chen, Wenxiu Yu, Yi Cui
Summary: A lithium-rich claystone with great potential for lithium exploration has been discovered in Central Yunnan, China. However, the origin of the claystone is still being debated. Through various analyses, it was found that the age distribution and source of the claystone differ. It is suggested that the weathering products from the Weining Formation may have provided the primary material for the Daoshitou Formation claystone.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Jin-Feng Sun, Jin-Hui Yang, Ji-Heng Zhang, Yue-Heng Yang, Yu-Sheng Zhu
Summary: Apatite geochemical and Sr-Nd isotopic compositions are powerful tools for studying the source and evolution of magma, providing evidence for the origin of granitoids. The distinct occurrences, geochemical features, and isotopic compositions of apatite grains in Early Cretaceous granite from northeastern China suggest different origins and processes.
Article
Geosciences, Multidisciplinary
L. R. Monnereau, B. S. Ellis, D. Szymanowski, O. Bachmann, M. Guillong
Summary: Analyzing the origin of dense, glassy pyroclasts in the Yellowstone-Snake River Plain province through geochemical and textural perspectives reveals they are juvenile and formed through multiple cycles of fracturing and sintering, contrasting previous interpretations as entrained hyaloclastite.
BULLETIN OF VOLCANOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Hua-Wen Cao, Qiu-Ming Pei, Xiao Yu, M. Santosh, Guang-Ming Li, Lin-Kui Zhang, Hao Zou, Lei Dong, Ke Gao, Zuo-Wen Dai, Jin-Biao Ai, Shuang-Shuang Lan, Fan Xiang, Ai-Bin Cao
Summary: The study reports the discovery and genesis of the Xiwu Pb-Zn-Ag deposit in the eastern Himalaya, which formed during the late-collisional tectonic transition stage. The ore materials originated from deeper metamorphic rocks and the ore-forming fluids were a mixture of metamorphic fluids and shallow formation waters.
Article
Geochemistry & Geophysics
Yusuke Miyajima, Michal Jakubowicz, Jolanta Dopieralska, Akihiro Kano, Robert G. Jenkins, Zdzislaw Belka, Takafumi Hirata
Summary: This study investigates the hydrogeological regime and structural evolution of the Cretaceous subduction zone in Hokkaido, Japan, by analyzing the timing and migration pathways of fluids emitted at ancient methane seeps. Results show that two fluid discharge events occurred during the accretionary stages, originating from the forearc basin rather than the underplating materials. The seeping fluids experienced interactions with the mafic rocks of the lower Sorachi ophiolite and siliciclastic sediments of the Yezo Group.
Article
Geosciences, Multidisciplinary
Hadi Shafaii Moghadam, Qiu-Li Li, Xian-Hua Li, Massimo Chiaradia, Orhan Karsli, Kaj A. Hoernle, William L. Griffin
Summary: Most continental arcs have episodic behavior with high-flux magmatic events and overall low rate of magmatism. The causes of these events are still enigmatic. The Cenozoic magmatic arcs of Iran provide a good opportunity to study the geochemical and isotopic feedback of magmatic pulses. The high magmatic fluxes in NE Iran were mainly caused by Eocene slab steepening after Paleocene flat-slab subduction. Rating: 8/10
Article
Geochemistry & Geophysics
Peng-Fei Lu, Ping-Ping Liu
Summary: In the Emeishan large igneous province (ELIP) of the Yangtze Block in SW China, there are abundant high-Ti and low-Ti basalts as well as plutonic complexes composed of gabbroic and A-type granitoid units. The study of these granitoids indicates that some were produced by fractional crystallization of high-Ti basaltic melts, while others were derived from partial melting of the mantle plume with variable amounts of high temperature-altered oceanic crust. These findings highlight the importance of the interaction of mantle plume with subducted slab, juvenile lower crust, and ancient crust in the generation of diverse igneous rocks in the large igneous provinces (LIPs).
Article
Geosciences, Multidisciplinary
Alf Andre Orvik, Trond Slagstad, Bjorn Eske Sorensen, Ian Millar, Harald Hansen
Summary: This study presents new mineralogical, geochronological, and isotopic data for the Gallojavri ultramafic intrusion in the Karasjok Greenstone Belt. The study suggests that the intrusion was formed around 2.05 billion years ago and experienced incomplete magma mixing and crustal interaction.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Mark K. Reagan, Daniel E. Heaton, Mark D. Schmitz, Julian A. Pearce, John W. Shervais, Anthony A. P. Koppers
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
John W. Shervais, Mark Reagan, Emily Haugen, Renat R. Almeev, Julian A. Pearce, Julie Prytulak, Jeffrey G. Ryan, Scott A. Whattam, Marguerite Godard, Timothy Chapman, Hongyan Li, Walter Kurz, Wendy R. Nelson, Daniel Heaton, Maria Kirchenbaur, Kenji Shimizu, Tetsuya Sakuyama, Yibing Li, Scott K. Vetter
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Geosciences, Multidisciplinary
Katherine E. Potter, Duane E. Champion, Robert A. Duncan, John W. Shervais
Article
Geochemistry & Geophysics
Hong-Yan Li, Rex N. Taylor, Julie Prytulak, Maria Kirchenbaur, John W. Shervais, Jeffrey G. Ryan, Marguerite Godard, Mark K. Reagan, Julian A. Pearce
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Energy & Fuels
Thomas E. Lachmar, Thomas G. Freeman, James A. Kessler, Joseph F. Batir, James P. Evans, Dennis L. Nielson, John W. Shervais, Xiwei Chen, Douglas R. Schmitt, David D. Blackwell
Article
Geochemistry & Geophysics
W. Kurz, P. Micheuz, G. L. Christeson, M. Reagan, J. W. Shervais, S. Kutterolf, A. Robertson, K. Krenn, K. Michibayashi, D. Quandt
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Multidisciplinary Sciences
Patricia Fryer, C. Geoffrey Wheat, Trevor Williams, Christopher Kelley, Kevin Johnson, Jeffrey Ryan, Walter Kurz, John Shervais, Elmar Albers, Barbara Bekins, Baptiste Debret, Jianghong Deng, Yanhui Dong, Philip Eickenbusch, Emanuelle Frery, Yuji Ichiyama, Raymond Johnston, Richard Kevorkian, Vitor Magalhaes, Simone Mantovanelli, Walter Menapace, Catriona Menzies, Katsuyoshi Michibayashi, Craig Moyer, Kelli Mullane, Jung-Woo Park, Roy Price, Olivier Sissmann, Shino Suzuki, Ken Takai, Bastien Walter, Rui Zhang, Diva Amon, Deborah Glickson, Shirley Pomponi
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Matthew R. M. Izawa, Neil R. Banerjee, John W. Shervais, Roberta Flemming, Callum J. Hetherington, Karlis Muehlenbachs, Cynthia Schultz, Debarati Das, Barry B. Hanan
FRONTIERS IN EARTH SCIENCE
(2019)
Article
Geochemistry & Geophysics
Scott A. Whattam, John W. Shervais, Mark K. Reagan, Daniel A. Coulthard, Julian A. Pearce, Peter Jones, Jieun Seo, Keith Putirka, Timothy Chapman, Daniel Heaton, Hongyan Li, Wendy R. Nelson, Kenji Shimizu, Robert J. Stern
AMERICAN MINERALOGIST
(2020)
Article
Geochemistry & Geophysics
Daniel A. Coulthard, Mark K. Reagan, Kenji Shimizu, Ilya N. Bindeman, Maryjo Brounce, Renat R. Almeev, Jeffrey Ryan, Timothy Chapman, John Shervais, Julian A. Pearce
Summary: The Expedition 352 to the Bonin forearc drilled the volcanic rocks sequence erupted during the immediate aftermath of subduction initiation. The collected volcanic glasses were analyzed for major and trace elements, halogens, sulfur, and H and O isotopes to characterize the fluids and melts involved in generating the new upper plate crust. The incompatible trace elements compositions of the oldest lavas are similar to the most depleted mid-ocean ridge basalts globally, indicating most lavas were generated by decompression melting in a near-trench environment.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
John W. Shervais, Mark K. Reagan, Marguerite Godard, Julie Prytulak, Jeffrey G. Ryan, Julian A. Pearce, Renat R. Almeev, Hongyan Li, Emily Haugen, Timothy Chapman, Walter Kurz, Wendy R. Nelson, Daniel E. Heaton, Maria Kirchenbaur, Kenji Shimizu, Tetsuya Sakuyama, Scott K. Vetter, Yibing Li, Scott Whattam
Summary: The International Ocean Discovery Program Expedition 352 collected comprehensive data on over 800 meters of in situ oceanic crust comprising boninite and boninite-series lavas in the Izu-Bonin forearc. The lavas were categorized into high-silica boninite, low-silica boninite, and basaltic boninite based on their chemical compositions, with distinct axial and off-axis lava types identified through chemostratigraphic analysis. This study provides insights into the origins and petrogenesis of these unusual boninite lavas in the forearc setting.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Jesse L. Scholpp, Jeffrey G. Ryan, John W. Shervais, Ciprian Stremtan, Martin Rittner, Antonio Luna, Stephen A. Hill, Zachary D. Atlas, Bradford C. Mack
Summary: This study analyzes Boninite samples recovered from Hole U1439C and finds highly variable mineral chemistries, indicating complex crystallization histories possibly influenced by multiple magma mixing events.
AMERICAN MINERALOGIST
(2022)
Article
Geosciences, Multidisciplinary
John W. Shervais
Summary: Tectonic discrimination diagrams are important tools for understanding the origins of ancient volcanic rocks. This study re-evaluates the Ti-V and Nb/Yb-Th/Yb diagrams using a compilation of over 15,000 whole rock compositions. A new two-proxy diagram, Ti/V vs. Th/Nb, is proposed to combine the advantages of both diagrams.
GEOSCIENCE FRONTIERS
(2022)
Article
Geosciences, Multidisciplinary
Elmar Albers, John W. Shervais, Christian T. Hansen, Yuji Ichiyama, Patricia Fryer
Summary: This paper investigates mass transfer at shallow subduction levels and its impact on deeper processes. Through the study of ocean island basalt clasts from the Mariana forearc, it is found that these rocks have undergone deep subduction and metamorphism before being recycled to the forearc seafloor. The study also reveals that the rocks have been strongly metasomatized and gained additional components during subduction. These findings are significant for understanding deep geochemical cycling.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Katherine E. Potter, John W. Shervais, Eric H. Christiansen, Scott K. Vetter
FRONTIERS IN EARTH SCIENCE
(2018)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)