Filters








930 Hits in 10.4 sec

Morphological and geochemical variations along the eastern Galápagos Spreading Center

David M. Christie, Reinhard Werner, Folkmar Hauff, Kaj Hoernle, Barry B. Hanan
2005 Geochemistry Geophysics Geosystems  
Chris Russo for performing the geochemical analyses with support from Adam Kent, Roger Nielsen, Ed Kohut, and Andy Ungerer.  ...  Paul Wintersteller and Matthias Müller for help with processing of the bathymetric data.  ...  Such observations have important implications for the details of material transfer from the Galápagos mantle plume to the GSC.  ... 
doi:10.1029/2004gc000714 fatcat:qsgbwt7zwzfiffxv5yp6owxju4

Suprasubduction-zone ophiolites: Is there really an ophiolite conundrum? [chapter]

Rodney V. Metcalf, John W. Shervais
2008 Special Paper 438: Ophiolites, Arcs, and Batholiths: A Tribute to Cliff Hopson  
textures in suprasubduction-zone ophiolites imply crystallization from magmas with high water activities, rather than mid-ocean-ridge systems; (4) models of whole Earth convection, subduction recycling  ...  island-arc settings and exhibit distinct differences from rocks formed at mid-ocean-ridge spreading centers; (2) slab-infl uenced compositions reported from modern ridge-trench triple junctions and subduction  ...  ACKNOWLEDGMENTS The authors have benefi ted over the years from spirited discussions with many ophioliteologists, but none has challenged us more than Cliff Hopson and Eldridge Moores, who forced us to  ... 
doi:10.1130/2008.2438(07) fatcat:yqi32o4gnjdcxbag6huqfrluwi

Structure and serpentinization of the subducting Cocos plate offshore Nicaragua and Costa Rica

H. J. A. Van Avendonk, W. S. Holbrook, D. Lizarralde, P. Denyer
2011 Geochemistry Geophysics Geosystems  
Our inversion of crustal and mantle seismic phases shows two notable features in the deep structure of the Cocos plate: (1) Normal oceanic crust of 6 km thickness from the East Pacific Rise (EPR) lies  ...  Hydration of oceanic lithosphere at deep sea trenches may be the most important mechanism for the transfer of aqueous fluids to volcanic arcs and the deeper mantle.  ...  Acknowledgments [53] We gratefully thank the officers and crew of the R/V Marcus Langseth and the R/V New Horizon and the engineers and technicians of the U.S.  ... 
doi:10.1029/2011gc003592 fatcat:ptzwityuizdxjeqnyhkqsyqu5y

Continental flood basalts derived from the hydrous mantle transition zone

Xuan-Ce Wang, Simon A. Wilde, Qiu-Li Li, Ya-Nan Yang
2015 Nature Communications  
Acknowledgements We thank Professors Zheng-Xiang Li (Curtin University) and Simon Turner (Macquarie University) for comments on an earlier draft. We are also grateful to X. M. Liu  ...  Recent geochemical and petrological studies 35,38 have demonstrated that an OIB-like enriched mantle component can form within the upper part of the mantle by enrichment with fluid or melt released from  ...  Geochemical studies and thermochemical modelling suggest that the massive degassing of volatiles (CO 2 and HCl) in some CFBs mostly originates from recycled crust in the deep Earth 61 .  ... 
doi:10.1038/ncomms8700 pmid:26169260 fatcat:f2ey2hzybreqnjkzkjsbw3yh7a

Significance of mud volcanism

Achim J. Kopf
2002 Reviews of Geophysics  
While the fluid enrichment patterns with increasing temperature measured by You et al. [1996] match those from MVs triggered by deep-seated fluids [e.g., Deyhle and Kopf, 2001] , MV muds are also enriched  ...  Depending on the geometry of the conduit and the physical properties of the extrusiva, the feature may be a dome (cone; see Figure 2a ) or a pie with low topographic relief.  ...  I particularly benefited from discussion with Jan Behrmann, Gerhard Bohrmann, Kevin Brown, Ben Clennell, Rachel Flecker, Pierre Henry, Dirk Klaeschen, Jean Mascle, Alastair Robertson, John Saunders, Liz  ... 
doi:10.1029/2000rg000093 fatcat:h7wimj66xzaiplwoyp2gqhshj4

Deep Mafic Roots to Arc Volcanoes: Mafic Recharge and Differentiation of Basaltic Andesite at North Sister Volcano, Oregon Cascades

Mariek E. Schmidt, Anita L. Grunder
2011 Journal of Petrology  
Concurrently, incompatible elements remain the same or decrease (e.g. from 302 to 247 ppm Ba).  ...  Isotopic variations at North Sister are small, but systematically progress toward more mantle-like ratios with time; 87 Sr/ 86 Sr decreases (from 0·70369 to 0·70356), and 144 Nd/ 143 Nd increases (from  ...  The periodicity may instead reflect characteristic scales of heat transfer in the arc crust, such as the time for heat to transfer from the base to the mid-crust and then to return to steady state for  ... 
doi:10.1093/petrology/egq094 fatcat:6c3mdfpzyfdnpfmtx46octk4oi

Magma genesis, plate tectonics, and chemical differentiation of the Earth

Peter J. Wyllie
1988 Reviews of Geophysics  
Volcanoes are beautiful structures, but ephemeral in geological time, and the progressive exposure of the deep-seated plutons feeding volcanoes provides a more detailed history of 370 the magmatic processes  ...  The crust is enriched in Si, A1, Ca, Na, and K, with Mg being left behind in the solid mantle when partial melting occurs. The mantle and crust are both heterogeneous.  ...  Details of the phase relations and the geometry of isoplethal sections are given by Wyllie [1978c Wyllie [ , 1979 Wyllie [ , 1980 .  ... 
doi:10.1029/rg026i003p00370 fatcat:mrg7mpjkebabphgzzeqhqbdzm4

Young rift kinematics in the Tadjoura rift, western Gulf of Aden, Republic of Djibouti

Mohamed A. Daoud, Bernard Le Gall, René C. Maury, Joël Rolet, Philippe Huchon, Hervé Guillou
2011 Tectonics  
The detailed and pertinent comments of three anonymous reviewers and the Associate Editor helped us considerably to improve the manuscript and to increase its focus.  ...  logistics; and Joseph Cotton, who performed the geochemical analyses.  ...  The latter probably derived from uplifted reliefs in the Arta and Somali surrounding domains.  ... 
doi:10.1029/2009tc002614 fatcat:52wvqkcntvabtlr2n573xkr72a

Enabling nanotechnology with self assembled block copolymer patterns

Cheolmin Park, Jongseung Yoon, Edwin L. Thomas
2003 Polymer  
Their applicability to nanotechnology stems from the scale of the microdomains and the convenient tunability of size, shape, and periodicity afforded by changing their molecular parameters.  ...  A particular emphasis is made on two approaches, epitaxy and graphoepitaxy, and their combinations.  ...  Park thanks Ministry of Science and Technology, the Republic of Korea, for financial support through R&D program for NT-IT fusion strategy of Advanced Technologies.  ... 
doi:10.1016/j.polymer.2003.08.011 fatcat:nwpvare32ra6be3gg552tpgbey

Construction, emplacement, and geochemical evolution of deep-crustal intrusions: Tenpeak and Dirtyface plutons, North Cascades, western North America

Robert B. Miller, Susan M. DeBari, Scott R. Paterson
2018 Geosphere  
Deep plutonic systems represent an important link between lowercrustal melt-generation sites and higher-level regions of magma accumulation, but models for these systems are limited by the relative scarcity  ...  The juxtaposition of different magma subtypes, at least local mixing at the emplacement level, and removal and/or recycling of older magmas indicates that magmas from different sources utilized the same  ...  ACKNOWLEDGMENTS This study was supported by National Science Foundation grants EAR-9812621 to SMD, EAR-9628280, EAR-9980662, and EAR-0948685 to RBM, and EAR-9627986 to SRP.  ... 
doi:10.1130/ges01490.1 fatcat:k2msvkgie5eprce4z6nsci4s24

An overview of the Izu-Bonin-Mariana subduction factory [chapter]

Robert J. Stern, Matthew J. Fouch, Simon L. Klemperer
2003 Inside the Subduction Factory  
The Wadati-Benioff Zone varies simply along strike, from dipping gently and failing to penetrate the 660 km discontinuity in the north to plunging vertically in the south into the deep mantle.  ...  There are four Subduction Factory outputs across the IBM IOCM: serpentinite mud volcanoes in the forearc, and as lavas erupted from along the volcanic front of the arc and back-arc basin and from arc cross-chains  ...  We are also grateful for thoughtful reviews of the manuscript provided by John Eiler and Mark Reagan.  ... 
doi:10.1029/138gm10 fatcat:ysakhd2anfhk3e2x6pdd2uernu

Translithospheric Mantle Diapirism: Geological Evidence and Numerical Modelling of the Kondyor Zoned Ultramafic Complex (Russian Far-East)

J.-P. Burg, J.-L. Bodinier, T. Gerya, R.-M. Bedini, F. Boudier, J.-M. Dautria, V. Prikhodko, A. Efimov, E. Pupier, J.-L. Balanec
2009 Journal of Petrology  
Their PM-normalized traceelement signature, marked by deep HFSE negative anomalies, is comparable with the patterns of other rock types from Kondyor and the Aldan Shield lamproites (Davies et al., 2006  ...  and internal geometry of intrusions with varying numerical model parameters Fig. 15 . 15 Distribution of non-lithostatic pressure component around the intrusion and the SMSR for emplacement stages from  ... 
doi:10.1093/petrology/egn083 fatcat:tni7avoxknbvhh3fxardncfokm

Tectonic Background of Four Hydrothermal Fields Along the Central Indian Ridge [chapter]

Kyoko Okino, Kentaro Nakamura, Hiroshi Sato
2014 Subseafloor Biosphere Linked to Hydrothermal Systems  
The Solitaire field at 19 33 0 S is located about 2.6 km away from the neo-volcanic zone and is likely influenced by intra-plate volcanism.  ...  These four hydrothermal fields show remarkable diversity in the chemical compositions of fluids and associated ecosystems.  ...  Acknowledgements We are grateful to the operation teams of the submersible SHINKAI 6500 and AUV r2D4, and to the crew of the R/ V HAKUHO MARU and R/V YOKOSUKA, for their skilled and proficient acquisition  ... 
doi:10.1007/978-4-431-54865-2_11 fatcat:b2eb3li3cnc7hjt6vxmeki5poq

Paroxysms at Stromboli Volcano (Italy): Source, Genesis and Dynamics

Nicole Métrich, Antonella Bertagnini, Marco Pistolesi
2021 Frontiers in Earth Science  
Moreover, we present new data on the geochemistry of the 2019 bulk pumice, along with a compilation of data from the literature, chemical profiles in olivine crystals, and the physical parameters of explosive  ...  the deep refilling by magma and its CO2-rich gas phase play a major role in triggering paroxysms.  ...  ACKNOWLEDGMENTS This research was conducted in the framework of the agreements between the Italian Department of Civil Protection with the Universities of Florence and Pisa (DEVNET). We thank S.  ... 
doi:10.3389/feart.2021.593339 fatcat:dlbnrexbe5akxew2rutplsvcza

Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)

Flavio Giaconia, Guillermo Booth-Rea, César R. Ranero, Eulàlia Gràcia, Rafael Bartolome, Alcinoe Calahorrano, Claudio Lo Iacono, Montserrat G. Vendrell, Alejandra L. Cameselle, Sergio Costa, Laura Gómez de la Peña, Sara Martínez-Loriente (+2 others)
2015 Tectonics  
anticlines and N10-20°E sinistral strike-slip faults like Palomares and Terreros faults.  ...  Deformation produced during the later positive inversion of the margin offshore and onshore is partitioned between~N50°E striking reverse faults and associated folds like the Sierra Cabrera and Abubacer  ...  The Palomares and Terreros sinistral fault systems transfer shortening at Sierra Almenara and Lomo de Bas to the Sierra Cabrera at the south (Figure 14) , while the dextral Polopos fault zone transfers  ... 
doi:10.1002/2015tc003861 fatcat:74ywnlmpojadjdtkyhpzkr42li
« Previous Showing results 1 — 15 out of 930 results