Browsing by Author "Langmuir, Charles"
Now showing items 21-40 of 41
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Links from Mantle to Microbe at the Lau Integrated Study Site: Insights from a Back-Arc Spreading Center
Tivey, Margaret; Becker, Erin; Beinart, Roxanne; Fisher, Charles; Girguis, Peter R.; Langmuir, Charles H.; Michael, Peter; Reysenbach, Anna-Louise (The Oceanography Society, 2012)The Lau Integrated Study Site (ISS) has provided unique opportunities for study of ridge processes because of its back-arc setting in the southwestern Pacific. Its location allows study of a biogeographical province distinct ... -
Lithium Isotopes in Guatemalan and Franciscan HP–LT Rocks: Insights into the Role of Sediment-Derived Fluids During Subduction
Simons, Kyla K.; Harlow, George E.; Brueckner, Hannes K.; Goldstein, Steven L.; Sorensen, Sorena S.; Hemming, N. Gary; Langmuir, Charles H. (Elsevier, 2010)High-pressure, low-temperature (HP–LT) rocks from a Cretaceous age subduction complex occur as tectonic blocks in serpentinite mélange along the Motagua Fault (MF) in central Guatemala. Eclogite and jadeitite among these ... -
Magmatic and Amagmatic Seafloor Generation at the Ultraslow-Spreading Gakkel Ridge, Arctic Ocean
Edmonds, Henrietta N.; Kurras, Gregory; Lehnert, Kerstin; Jokat, Wilfried; Graham, David W.; Muhe, Richard; Goldstein, Steven L.; Snow, Jonathan E.; Dick, Henry J.B.; Michael, Peter J.; Langmuir, Charles (Nature Publishing Group, 2003)A high-resolution mapping and sampling study of the Gakkel ridge was accomplished during an international ice-breaker expedition to the high Arctic and North Pole in summer 2001. For this slowest-spreading endmember of the ... -
Mantle Melting Beneath Mid-Ocean Ridges
Langmuir, Charles; Forsyth, Donald W. (Oceanography Society, 2007)none available -
Mantle Source Variations beneath the Eastern Lau Spreading Center and the Nature of Subduction Components in the Lau Basin-Tonga Arc System
Escrig, S.; Bézos, A.; Goldstein, S. L.; Langmuir, Charles H.; Michael, P. J. (American Geophysical Union, 2009)New high-density sampling of the Eastern Lau Spreading Center provides constraints on the processes that affect the mantle wedge beneath a back-arc environment, including the effect of the subduction input on basalt ... -
The mean composition of ocean ridge basalts
Gale, Allison; Dalton, Colleen A.; Langmuir, Charles H.; Su, Yongjun; Schilling, Jean-Guy (Wiley-Blackwell, 2013)The mean composition of mid-ocean ridge basalts (MORB) is determined using a global data set of major ele- ments, trace elements, and isotopes compiled from new and previously published data. A global catalog of 771 ridge ... -
Melting and Crustal Processes at the FAMOUS Segment (Mid-Atlantic Ridge): New Insights from Olivine-hosted Melt Inclusions from Multiple Samples
Laubier, Muriel; Gale, Allison; Langmuir, Charles H. (Oxford University Press, 2012)Most published studies of olivine-hosted melt inclusions from mid-ocean ridges have been based on a single sample. Here we present a comprehensive melt inclusion study of major and trace elements from a single ocean ridge ... -
A New Parameterization of Hydrous Mantle Melting
Katz, Richard F.; Spiegelman, Marc; Langmuir, Charles (American Geophysical Union, 2003)Modeling of melt formation and transport in all tectonic settings requires the inclusion of water, since water has large effects on mantle solidi as well as physical properties of liquids. To facilitate the inclusion of ... -
Origin of a 'Southern Hemisphere' Geochemical Signature in the Arctic Upper Mantle
Goldstein, Steven L.; Soffer, Gad; Langmuir, Charles; Lehnert, Kerstin A.; Graham, David W.; Michael, Peter J. (Nature Publishing Group, 2008)The Gakkel ridge, which extends under the Arctic ice cap for similar to 1,800 km, is the slowest spreading ocean ridge on Earth. Its spreading created the Eurasian basin, which is isolated from the rest of the oceanic ... -
Origin of Enriched Ocean Ridge Basalts and Implications for Mantle Dynamics
Donnelly, Kathleen E.; Goldstein, Steven L.; Langmuir, Charles; Spiegelman, Marc (Elsevier, 2004)The Mid-Atlantic Ridge (MAR) south of the Kane Fracture Zone at similar to23degreesN (the MARK area) is distant from hot spots and a type area for "normal" mid-ocean ridge basalt (N-MORB) depleted in highly incompatible ... -
Origins of Chemical Diversity of Back-Arc Basin Basalts: A Segment-Scale Study of the Eastern Lau Spreading Center
Bézos, Antoine; Escrig, Stéphane; Langmuir, Charles H.; Michael, Peter J.; Asimow, Paul D. (American Geophysical Union, 2009)We report major, trace, and volatile element data on basaltic glasses from the northernmost segment of the Eastern Lau Spreading Center (ELSC1) in the Lau back-arc basin to further test and constrain models of back-arc ... -
Perspectives on Ocean Ridge Basalts from the Segment to the Global Scale
Gale, Allison (2012-11-02)This study addresses the influences on ridge basalt chemistry, through analysis of their major and trace element and isotopic composition at scales ranging from individual ridge segments to the entire length of the ridge ... -
PetroPlot: A Plotting and Data Management Tool Set for Microsoft Excel
Su, Yongjun; Langmuir, Charles; Asimow, Pauld D. (American Geophysical Union, 2003)PetroPlot is a 4000-line software code written in Visual Basic for the spreadsheet program Excel that automates plotting and data management tasks for large amount of data. The major plotting functions include: automation ... -
The Processes of Melt Differentiation in Arc Volcanic Rocks: Insights from OIB-type Arc Magmas in the Central Mexican Volcanic Belt
Straub, S. M.; Gomez-Tuena, A.; Zellmer, G. F.; Espinasa-Perena, R.; Stuart, F. M.; Cai, Y.; Langmuir, Charles H.; Martin-Del Pozzo, A. L.; Mesko, G. T. (Oxford University Press (OUP), 2013)Andesite petrogenesis is inextricably linked to plate processing at convergent margins. The details of andesite formation, however, remain poorly understood because the signatures of the initial arc mantle melts are often ... -
Recycled Dehydrated Lithosphere Observed in Plume-Influenced Mid-Ocean-Ridge Basalt
Dixon, Jacqueline Eaby; Leist, Lorreta; Langmuir, Charles; Schilling, Jean-Guy (Nature Publishing Group, 2002)A substantial uncertainty in the Earth's global geochemical water cycle is the amount of water that enters the deep mantle through the subduction and recycling of hydrated oceanic lithosphere. Here we address the question ... -
Response to Comment on "Glacial cycles drive variations in the production of oceanic crust"
Crowley, J. W.; Katz, R. F.; Huybers, Peter John; Langmuir, Charles H.; Park, S.-H. (American Association for the Advancement of Science (AAAS), 2015) -
Role of f0(2) on Fluid Saturation in Oceanic Basalt - Reply
Saal, Alberto E.; Hauri, Erik H.; Langmuir, Charles; Perfit, Michael R. (Nature Publishing Group, 2004) -
Sedimentation, stratigraphy and physical properties of sediment on the Juan de Fuca Ridge
Costa, K.M.; McManus, J.F.; Boulahanis, B.; Carbotte, S.M.; Winckler, G.; Huybers, Peter John; Langmuir, Charles H. (Elsevier BV, 2016)Sedimentation near mid-ocean ridges may differ from pelagic sedimentation due to the influence of the ridges' rough topography on sediment deposition and transport. This study explores whether the near-ridge environment ... -
Temporal Control of Subduction Magmatism in the Eastern Trans-Mexican Volcanic Belt: Mantle Sources, Slab Contributions, and Crustal Contamination
Carrasco-Nunez, Gerardo; Ortega-Gutierrez, Fernando; Goldstein, Steven L.; Langmuir, Charles; LaGatta, Alexandra B.; Gomez-Tuena, Arturo (American Geophysical Union, 2003)The magmatic record of the easternmost part of the Trans-Mexican Volcanic Belt elucidates how temporal changes in subduction parameters influence convergent margin volcanism. In the Palma Sola massif, three phases of ... -
Volcanic Glasses at the Izu Arc Volcanic Front: New Perspectives on Fluid and Sediment Melt Recycling in Subduction Zones
Straub, S.M; Layne, G.D.; Schmidt, A.; Langmuir, Charles (American Geophysical Union, 2004)Volcanic glasses contained in distal fallout tephras from the Izu arc volcanic front (Izu VF) provide unique perspectives on general problems of arc volcanism. Unlike cogenetic lavas, these glasses are liquid compositions ...