Browsing by Author "Langmuir, Charles"
Now showing items 1-20 of 41
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A 65 k.y. Time Series From Sediment-Hosted Glasses Reveals Rapid Transitions in Ocean Ridge Magmas
Ferguson, David; Li, Yinqi; Langmuir, Charles; Costa, Kassandra; McManus, Jerry; Huybers, Peter; Corbotte, Suzanne (Geological Society of America, 2017)Studies of ocean ridge magmatism have been hampered by the difficulty in constructing time-series data over more than a few thousand years. Sediment rapidly covers newly formed ocean crust, and older rocks, even when ... -
Adakitic Dacites Formed by Intracrustal Crystal Fractionation of Water-Rich Parent Magmas at Nevado de Longav Volcano (36.2 Degrees S; Andean Southern Volcanic Zone, Central Chile)
Rodriguez, Carolina; Selles, Daniel; Dungan, Michael; Langmuir, Charles; Leeman, William (Oxford University Press, 2007)The mid-Holocene eruptive products of Nevado de Longav volcano (362S, Chile) are the only reported occurrence of adakitic volcanic rocks in the Quaternary Andean Southern Volcanic Zone (3346S). Dacites of this volcano are ... -
Assimilation of the Plutonic Roots of the Andean Arc Controls Variations in U-series Disequilibria at Volcan Llaima, Chile
Reubi, O.; Bourdon, B.; Dungan, M.A.; Koornneef, J.M.; Sellés, D.; Langmuir, Charles H.; Aciego, S. (Elsevier, 2011)U-series disequilibria provide important constraints on the processes and time scales of melt production, differentiation, and transport in subduction settings. Such constraints, which are essential for understanding the ... -
Chronology and geochemistry of Taxinan basalts from the Tarim basin: evidence for Permian plume magmatism
ZiLong, Li; ShuFeng, Yang; HanLin, Chen; Langmuir, Charles H.; Xing, Yu; XiuBin, Lin; YinQi, Li (Chinese Academy of Sciences, 2008)A new K-Ar age of 289.6Ma has been obtained for Taxinan basalt in the southwest Tarim basin of the northwest China. This age is consistent with the Ar-Ar age of 290. 1Ma from the same sample. This dating confirms the ... -
Comment on "Sensitivity of Seafloor Bathymetry to Climate-Driven Fluctuations in Mid-Ocean Ridge Magma Supply"
Huybers, Peter; Langmuir, Charles H.; Katz, Richard; Ferguson, D.; Proistosescu, Cristian; Carbotte, S. (American Association for the Advancement of Science (AAAS), 2016)Recent studies have proposed that the bathymetric fabric of the seafloor formed at mid-ocean ridges records rapid (23,000 to 100,000 years) fluctuations in ridge magma supply caused by sealevel changes that modulate melt ... -
Constraining Subduction Zone Processes Through Local, Regional, and Global Chemical Systematics
Turner, Stephen (2015-04-08)Subduction zones recycle material from Earth’s surface into the mantle, and are an important means of continent building. The subduction system serves as a stamp, imprinting the distinct chemical characteristics of our ... -
Constraints on melting processes and plume-ridge interaction from comprehensive study of the FAMOUS and North Famous segments, Mid-Atlantic Ridge
Gale, Allison; Laubier, Muriel; Escrig, Stephane Laurent; Langmuir, Charles H. (Elsevier BV, 2013)Detailed major element, trace element and isotopic study of the FAMOUS and North Famous segments within the geochemical gradient south of the Azores platform provides new constraints on controls on chemical variations at ... -
Correction to “Domains of depleted mantle: New evidence from hafnium and neodymium isotopes”
Salters, Vincent J. M.; Mallick, Soumen; Hart, Stanley R.; Langmuir, Charles H.; Stracke, Andreas (Wiley-Blackwell, 2011) -
Delayed CO 2 Emissions From Mid-Ocean Ridge Volcanism as a Possible Cause of Late-Pleistocene Glacial Cycles
Huybers, Peter; Langmuir, Charles (Elsevier BV, 2017-01)The coupled 100,000 year variations in ice volume, temperature, and atmospheric CO2 during the late Pleistocene are generally considered to arise from a combination of orbital forcing, ice dynamics, and ocean circulation. ... -
Discovery of Abundant Hydrothermal Venting on the Ultra-Slow Spreading Gakkel Ridge, Arctic Ocean
Graham, D.W.; German, C.R.; Muhe, R.; Dick, H.J.B.; Langmuir, Charles; Snow, J.E.; Connelly, D.P.; Baker, E.T.; Michael, P.J.; Edmonds, H.N. (Nature Publishing Group, 2003)Submarine hydrothermal venting along mid-ocean ridges is an important contributor to ridge thermal structure(1), and the global distribution of such vents has implications for heat and mass fluxes(2) from the Earth's crust ... -
Domains of depleted mantle: New evidence from hafnium and neodymium isotopes
Salters, Vincent J. M.; Mallick, Soumen; Hart, Stanley R.; Langmuir, Charles H.; Stracke, Andreas (Wiley-Blackwell, 2011)Isotope systematics of basalts provide information on the distribution of mantle components and the length scale of mantle heterogeneity. To obtain this information, high data and sampling density are crucial. We present ... -
Enriched Basalts at Segment Centers: The Lucky Strike (37°17′N) and Menez Gwen (37°50′N) Segments of the Mid‐Atlantic Ridge
Gale, Allison; Escrig, Stephane Laurent; Gier, Elizabeth J.; Langmuir, Charles H.; Goldstein, Steven L. (American Geophysical Union, 2011)Basalts from the Mid-Atlantic Ridge change progressively in composition with increasing distance from the Azores platform. Study of the Lucky Strike and Menez Gwen segments reveals much complexity in the gradient. Both ... -
Feedback Between Deglaciation, Volcanism, and Atmospheric CO2
Huybers, Peter John; Langmuir, Charles H. (Elsevier, 2009)An evaluation of the historical record of volcanic eruptions shows that subaerial volcanism increases globally by two to six times above background levels between 12 ka and 7 ka, during the last deglaciation. Increased ... -
Geochemical Evidence for Slab Melting in the Trans-Mexican Volcanic Belt
Ortega-Gutierrez, Fernando; Straub, Susanne; Goldstein, Steven L.; Langmuir, Charles; Gomez-Tuena, Arturo (Oxford University Press, 2007)Geochemical studies of Plio-Quaternary volcanic rocks from the Valle de Bravo-Zitacuaro volcanic field (VBZ) in central Mexico indicate that slab melting plays a key role in the petrogenesis of the Trans-Mexican Volcanic ... -
Glacial cycles drive variations in the production of oceanic crust
Crowley, John W.; Katz, Richard F.; Huybers, Peter John; Langmuir, Charles H.; Park, Sung-Hyun (American Association for the Advancement of Science (AAAS), 2015)Glacial cycles redistribute water between oceans and continents, causing pressure changes in the upper mantle, with consequences for the melting of Earth’s interior. Using Plio-Pleistocene sea-level variations as a forcing ... -
Hydrothermal Deposition on the Juan De Fuca Ridge Over Multiple Glacial–interglacial Cycles
Costa, Kassandra; McManus, Jerry; Middleton, Jennifer; Langmuir, Charles; Huybers, Peter; Winckler, Gisela; Mukhopadhyay, Sujoy (Elsevier BV, 2017-12)Hydrothermal systems play an important role in modern marine chemistry, but little is known about how they may have varied on 100,000 year timescales. Here we present high-resolution records of non-lithogenic metal fluxes ... -
Hydrothermal Exploration of the Fonualei Rift and Spreading Center and the Northeast Lau Spreading Center
German, C.R.; Baker, E.T.; Connelly, D.P.; Lupton, J.E.; Resing, J.; Prien, R.D.; Walker, S.L.; Edmonds, H.N.; Langmuir, Charles (American Geophysical Union, 2006)We report evidence for active hydrothermal venting along two back-arc spreading centers of the NE Lau Basin: the Fonualei Rift and Spreading Center (FRSC) and the Northeast Lau Spreading Center (NELSC). The ridge segments ... -
A Hydrous Melting and Fractionation Model for Mid-Ocean Ridge Basalts: Application to the Mid-Atlantic Ridge Near the Azores
Asimow, P.D.; Dixon, J.E.; Langmuir, Charles (American Geophysical Union, 2004)The major element, trace element, and isotopic composition of mid-ocean ridge basalt glasses affected by the Azores hotspot are strongly correlated with H2O content of the glass. Distinguishing the relative importance of ... -
The Importance of Water to Oceanic Mantle Melting Regimes
Asimow, Paul D.; Langmuir, Charles (Nature Publishing Group, 2003)The formation of basaltic crust at mid-ocean ridges and ocean islands provides a window into the compositional and thermal state of the Earth's upper mantle. But the interpretation of geochemical and crustal-thickness data ... -
Insights into the Mechanism of Intermediate-Depth Earthquakes from Source Properties as Imaged by Back Projection of Multiple Seismic Phases
Kiser, E.; Ishii, Miaki; Langmuir, Charles H.; Shearer, P. M.; Hirose, H. (American Geophysical Union, 2011)This study investigates the spatial and temporal distribution of energy release of large, intermediate-depth earthquakes using a modified back projection technique first used to study the 2004 Sumatra-Andaman megathrust ...