Article
Geosciences, Multidisciplinary
Ryan J. Waldman, Kathleen M. Marsaglia, Rosemary Hickey-Vargas, Osamu Ishizuka, Kyle E. Johnson, Anders McCarthy, Gene Yogodzinski, Eshita Samajpati, He Li, Kate Laxton, Ivan P. Savov, Sebastien Meffre, Richard J. Arculus, Alexandre N. Bandini, Andrew P. Barth, Kara Bogus, Philipp A. Brandl, Michael Gurnis, Fuqing Jiang
Summary: The oldest known and intact sedimentary record of a nascent intraoceanic arc was discovered at International Ocean Discovery Program Site U1438. The geological sequence includes mudstone, volcaniclastic deposits, intrusion of volcanic magma, island arc magmatism, indicating the changes and activities at the early stage of subduction initiation.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geochemistry & Geophysics
P. W. Ball, G. G. Roberts, D. F. Mark, D. N. Barfod, N. J. White, B. H. Lodhia, M. M. Nahdi, S. Garni
Summary: Harrat Rahat is the largest volcanic field in Saudi Arabia and has been active from around 10 Ma to the present day. Recent eruptions at Harrat Rahat have been extensively studied, but the evolution of its oldest lava flows, known as the Shawahit Basalt, is poorly understood. In this study, we collected and analyzed samples from Harrat Rahat, focusing on the Shawahit unit. We found that the volcanic activity at Harrat Rahat was initiated by a mantle plume beneath a thinned lithosphere, and the changes in geochemistry can be attributed to a decrease in melt productivity and contamination.
Article
Geochemistry & Geophysics
Bryant Ware, Fred Jourdan, Nicholas E. Timms
Summary: This study investigates the duration of magmatic activity in the Tasmanian dolerites (Ferrar) using high-precision geochronology. The results show that the magmatic activity lasted for about 1.6 million years, longer than previously thought. The study also reveals the inheritance of plagioclase crystals and the evolution of magma chemistry.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Jin-Gen Dai, Cheng-Shan Wang, Robert J. Stern, Kai Yang, Jie Shen
Summary: Comparing the geological, geochemical, and geochronological data from the Xigaze ophiolite in southern Tibet with the Izu-Bonin-Mariana forearc, differences in mantle sources and magmatic evolution were identified. It is proposed that an Early Cretaceous subduction initiation event occurred on the southern flank of the Lhasa terrane. The mantle sources and magmatic evolution in the Xigaze ophiolite were found to be more variable than those of the Izu-Bonin-Mariana forearc.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geochemistry & Geophysics
M. M. Ariza-Acero, R. Spikings, A. Beltran-Trivino, A. Ulianov, A. von Quadt
Summary: This study investigates the age, tectonic origin, and evolution of the Choco-Panama block using field observations, geochemical, isotopic, and geochronological analyses. The results improve tectonic models of the Caribbean Plate. The mafic basement of the Choco-Panama block is shown to have formed within an oceanic plateau and is similar to plateau units in Colombia, Ecuador, Panama, and Costa Rica. The sedimentary rocks overlying the basement have a maximum depositional age of around 28 Ma, supporting the collision between the Choco-Panama block and South America during the Oligocene to Early Miocene.
Article
Geosciences, Multidisciplinary
Entao Liu, I. Tonguc Uysal, Jian-Xin Zhao, Zi'ao Zhang, Xudong Lin
Summary: This study conducted Rb-Sr and 40Ar-39Ar dating of illitic clay samples from Palaeogene sandstone in the northern South China Sea. The Rb-Sr data confirmed three periods of fluid flow events related to episodic tectonism, while the 40Ar-39Ar ages were significantly younger, likely due to 40Ar loss caused by later dry heating events. The inconsistency between the two dating methods suggests different isotopic behaviors of K-Ar and Rb-Sr isotopic systematics in illite.
JOURNAL OF EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Hong-Yan Li, Rui-Peng Zhao, Jie Li, Yoshihiko Tamura, Christopher Spencer, Robert J. Stern, Jeffrey G. Ryan, Yi-Gang Xu
Summary: A deep neural network is used to automatically extract ground deformation from Interferometric Synthetic Aperture Radar time series. The method detects 2 mm deformation transients over the North Anatolian Fault and reveals a previously unrecognized slow earthquake. The study investigates how serpentinites in the forearc mantle and subducted lithosphere enrich the subarc mantle source of arc magmas.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Sanna Holm-Alwmark, Fred Jourdan, Ludovic Ferriere, Carl Alwmark, Christian Koeberl
Summary: This study focuses on the Puchezh-Katunki impact structure in Russia, accurately dating its formation to 195.9 +/- 1.0 Ma using 40Ar/39Ar data. The research challenges previous temporal correlations between the impact event and multiple extinction events, emphasizes the importance of careful sample preparation and methodology in overcoming 40Ar issues, and highlights the need for caution when suggesting connections between specific impact events and extinction events.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Review
Geosciences, Multidisciplinary
Yang Wu, Xiu-Juan Bai, He-Sheng Shi, Li-Yan He, Hua-Ning Qiu
Summary: This paper provides a review of dating methods relying on the K-Ar and Rb-Sr isotopic decay systems applied in sedimentary rocks. It discusses the sample preparation and analytical techniques associated with these methods and summarizes their applications in various sedimentary settings. The paper also highlights the use of Rb-Sr and 40Ar/39Ar dating in determining depositional ages and trapped ancient atmospheric argon components in chert.
EARTH-SCIENCE REVIEWS
(2023)
Article
Engineering, Marine
Qian Liu, Limei Tang, Ling Chen, Peng Gao
Summary: Seamounts are features generated by hot spots and intraplate volcanic activity. The geochemical characteristics of seamounts provide important details about dynamic processes in the Earth. This study analyzed basalt samples from seamounts in the Western Pacific to determine their ages and geochemical characteristics. The results suggest that these seamounts formed from magma originating in the deep mantle and exhibit alkaline basalt characteristics.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geography, Physical
Alan L. Deino, Clifford Heil, John King, Lindsay J. McHenry, Ian G. Stanistreet, Harald Stollhofen, Jackson K. Njau, Joshua Mwankunda, Kathy D. Schick, Nicholas Toth
Summary: The Olduvai Gorge Coring Project in Tanzania drilled cores at three sites in the Olduvai Basin, developing a chronostratigraphic framework. Through dating, paleomagnetic stratigraphy, and tephrochemical correlation, they obtained realistic age estimates. The age models revealed varying sedimentation rates in the basin's history and provided new estimates for the basal contacts of upper stratigraphic units in Olduvai Gorge.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Walter Szeliga, Rachelle Reisinger, Breanyn MacInnes
Summary: The study investigates the absence of large magnitude, shallow earthquakes in the Izu-Bonin-Mariana Subduction System (IBM) and proposes a different perspective by considering the possibility of great earthquakes with no documentable evidence. By simulating expected tsunami wave heights, the study finds that most IBM source models would be observable at historically inhabited locations in the Pacific Basin, but some models with earthquake magnitudes as high as Mw 8.7 would produce tsunami wave heights that are essentially unobservable at populated areas.
EARTH PLANETS AND SPACE
(2022)
Article
Geosciences, Multidisciplinary
Vivian Ruiz-Mendoza, Sanjeet K. Verma, Dario Torres-Sanchez, Tiffany L. Barry, Juan A. Moreno, Jose Ramon Torres-Hernandez
Summary: The volcanic rocks in the Compostela area of Mexico's Nayarit state were formed during the Pleistocene, with compositions ranging from intermediate to subalkaline series. Geochemical analysis indicates crystal fractionation and assimilation of crustal rocks as important processes in the formation of these rocks. Different types of volcanic rocks in the area have distinct sources and formation environments based on their geochemical signatures.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Morgan J. Salisbury, Nestor Jimenez, Dan Barfod
Summary: This study examines the geochemical variations in the volcanic area of Intersalar Range in western Bolivia. The results show a correlation between the age and geochemical characteristics of the volcanic rocks and the reararc regions. Furthermore, the Nb/Nb* values indicate the presence of intact mantle lithosphere in the central Altiplano.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Raul O. C. Fonseca, Lina T. Michely, Maria Kirchenbaur, Julie Prytulak, Jeffrey Ryan, Kerstin Hauke, Felipe P. Leitzke, Renat R. Almeev, Chris S. Marien, Axel Gerdes, Rico Schellhorn
Summary: The Izu-Bonin-Mariana volcanic arc, formed as a result of subduction initiation at a convergent plate margin, features unusual globular textures in andesitic glass within the forearc basalt stratigraphy. Detailed analysis of these samples show that the globular andesites likely formed from the assimilation of shallowly altered oceanic crust during forearc basaltic magmatism, introducing radiogenic Sr and heavier B isotopes. This process may have led to significant trace element and stable isotope fractionation, suggesting the need for further experimental studies on this phenomenon.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Multidisciplinary Sciences
Xin Zhou, Zhong-Hai Li, Taras Gerya, Robert J. Stern
Article
Geochemistry & Geophysics
Osamu Ishizuka, Rex N. Taylor, Susumu Umino, Kyoko Kanayama
JOURNAL OF PETROLOGY
(2020)
Article
Geosciences, Multidisciplinary
Emma J. Watts, Thomas M. Gernon, Rex N. Taylor, Derek Keir, Melanie Siegburg, Jasmin Jarman, Carolina Pagli, Anna Gioncada
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2020)
Article
Geochemistry & Geophysics
Christopher A. Parendo, Stein B. Jacobsen, Jun-Ichi Kimura, Rex N. Taylor
Summary: In subduction zones, fluids rising from the slab to the mantle cause metasomatism and flux melting of the mantle to produce arc magmas. The study investigates the transport of K in subduction zones by analyzing K stable isotope variations in lavas of the Izu arc. Results show isotopically heavy K in Izu lavas relative to midocean ridge basalt-source upper mantle, with delta(41)Kvalues decreasing across the arc, suggesting isotopic fractionation during slab dehydration and progressive breakdown of certain phases. The study also explores the role of different source materials and the possibility of slab signal attenuation in the rear arc due to fluid-mantle interaction.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geology
Taha Sadeghi Chorsi, Jochen Braunmiller, Fanghui Deng, Nicholas Mueller, Scott Kerstetter, Robert J. Stern, Timothy H. Dixon
Summary: The M 6.5 earthquake near Mina, Nevada on May 15, 2020 was well-documented with seismic and geodetic instrumentation, allowing for detailed analysis of the surface rupture. Integration of multiple datasets revealed educational and research opportunities, with models for slip at depth consistent with various data sources. The earthquake also suggests new seismic hazard assessment approaches may be needed for rapidly evolving tectonic regions.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Multidisciplinary Sciences
Hong-Yan Li, Rui-Peng Zhao, Jie Li, Yoshihiko Tamura, Christopher Spencer, Robert J. Stern, Jeffrey G. Ryan, Yi-Gang Xu
Summary: A deep neural network is used to automatically extract ground deformation from Interferometric Synthetic Aperture Radar time series. The method detects 2 mm deformation transients over the North Anatolian Fault and reveals a previously unrecognized slow earthquake. The study investigates how serpentinites in the forearc mantle and subducted lithosphere enrich the subarc mantle source of arc magmas.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Rex N. Taylor, Osamu Ishizuka, Isabel Hessey, Agnes Michalik, Lauren Stillwell, Stephen White
Summary: The evolution and inputs beneath the supra-subduction spreading ridge have been traced using high-resolution isotope measurements of fluid-mobile lead, showing variable amounts of lead from the mantle wedge and non-mobile elements from the slab.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Osamu Ishizuka, Kenichiro Tani, Rex N. Taylor, Susumu Umino, Izumi Sakamoto, Yuka Yokoyama, Gen Shimoda, Yumiko Harigane, Yasuhiko Ohara, Chris E. Conway, Americus Perez, Shun Sekimoto
Summary: The study reveals the existence of andesitic magmatism in the oldest part of the northern Philippine Sea plate, which is not associated with subduction but possibly related to rifting. Late Eocene basaltic magmatism may be associated with asthenospheric mantle during the final stage of basin spreading.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Review
Geochemistry & Geophysics
H. Y. Hu, R. J. Stern, Y. Rojas-Agramonte, A. Garcia-Casco
Summary: This study compiled geochronologic and geochemical data of igneous and metamorphic rocks in the Greater Antilles islands to investigate the formation and evolution of the Greater Antilles Arc (GAA). The results indicate that the GAA started in the Early Cretaceous and ceased in the Paleogene, and it was influenced by the Caribbean Large Igneous Province.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Shi-Min Li, Qing Wang, Di-Cheng Zhu, Peter A. Cawood, Robert J. Stern, Zhidan Zhao
Summary: The compositional similarity between high-Mg andesite-dacite from accretionary orogens and bulk continental crust provides an opportunity to unravel the CC formation paradox. Compositional data from a global compilation of Quaternary magmatic arcs indicate the presence of low-Mg series and high-Mg series. The LMS show trends of crystal fractionation, while the HMS have mixed compositions that can be explained by partial melting of melange diapirs rising into the mantle wedge.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Emma L. Horn, Rex N. Taylor, Thomas M. Gernon, Michael J. Stock, E. M. Ruth Farley
Summary: Deciphering the dynamics of sub-volcanic magmatic processes requires understanding the relationships between melt and crystals. A study of the Fasnia event on Tenerife Island reveals that crystalline mush preserved the proportions and relationships between crystal framework and pre-eruptive melt, providing a snapshot of the sub-volcanic system at a single point in time.
JOURNAL OF PETROLOGY
(2022)
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.
Review
Chemistry, Analytical
E. Hywel Evans, Jorge Pisonero, Clare M. M. Smith, Rex N. Taylor
Summary: This review summarizes 194 references on "Atomic Spectrometry" published from November 2020 to November 2021. It covers developments in atomic emission, absorption, fluorescence, and mass spectrometry, excluding material on speciation and coupled techniques. The review focuses on novel developments in instrumentation, techniques, and methodology.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Review
Chemistry, Analytical
E. Hywel Evans, Jorge Pisonero, Clare M. M. Smith, Rex N. Taylor
Summary: This review covers developments in Atomic Spectrometry from November 2019 to November 2020, focusing on novel advancements in instrumentation, techniques, and methodology, particularly in the analysis of nanoparticles and mass spectrometry.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Review
Chemistry, Analytical
E. Hywel Evans, Jorge Pisonero, Clare M. Smith, Rex N. Taylor
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2020)
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)