N. Shimizu

Woods Hole Oceanographic Institution

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C. K. Shearer

University of New Mexico

Graham D. Layne

Memorial University of Newfoundland

Nadine Mattielli

Université Libre de Bruxelles

Dominique Weis

Pacific Centre for Isotopic and Geochemical Research

J. J. Papike

University of New Mexico

J. M. Warren

University of Delaware

H. J. Dick

Woods Hole Oceanographic Institution

Pierre Schiano

Laboratoire Magmas et Volcans

R. Clocchiatti

Laboratoire de Mesure du Carbone 14

Kenneth T. Koga

Centre National de la Recherche Scientifique

Cooperative Institutions

Planetary Science Institute

Massachusetts Institute of Technology

Centre National de la Recherche Scientifique

Woods Hole Oceanographic Institution

Virginia Tech

Carnegie Institution for Science

Brown University

Institut de Recherche pour le Développement

Columbia University

Lamont-Doherty Earth Observatory

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Depths of Melting and Melt Extraction Beneath Mid-Ocean Ridges as Recorded in Melt Inclusions

Mineralogical Magazine (1994)

N. Shimizu

Recent studies have shown that chemical compositions of primitive melt inclusions in olivine and plagioclase phenocrysts in mid-ocean ridge basalts (MORB) carry important information of process of melting and melt extraction beneath mid-ocean ridges (e.g., Sobolev and Shimizu, 1993). It is generally observed that variations of trace element abundances and abundance ratios in melt inclusions on small sampling scales (e.g., single dredge, single pillow) are very large, and can be adequately explained by melting models involving efficient extraction of small-degree melt fractions. This paper reports chemical variations in two primitive melt inclusion suites (33.7~ MidAtlantic Ridge and 36.5~ Mid-Atlantic Ridge, FAMOUS area) with distinct trace element characteristics, representing melting and melt extraction occurred at different depths. Major element compositions in melt inclusions and host minerals were determined with a JEOL 733 at MIT, and trace element abundances (Ti, V, Cr, Sr, Y, Zr, REE) were determined with a Cameca IMS 3f at WHOI. Only perfectly glassy primary inclusions were analyzed. Effects of postentrapment growth of host minerals were found to be typically 5 ~ 15%. Olivine (s9-91)- and plagioclase (Ansl-ss)

Melt inclusions

10.1180/minmag.1994.58a.2.167

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Citations (5)

An Ion Microprobe Study of the Intra-Crystalline Behavior of REE and Selected Trace Elements in Pyroxenes from Mare Basalts with Different Cooling and Crystallization Histories, Preliminary Results

LPI (1988)

C. K. Shearer J. J. Papike S. B. Simon N. Shimizu

Microprobe

Trace element

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Citations (2)

Submarine Explosive Eruptions at Lo'ihi Seamount Hawai'i- the Result of Perfectly-Closed System Degassing

AGUFM (2008)

C. Ian Schipper James D. L. White B. F. Houghton N. Shimizu Robert B. Stewart

Seamount

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A new experimental method for determining cpx/melt trace element partitioning during peridotite melting

Geochimica et Cosmochimica Acta Supplement (2005)

Mauro Lo Cascio Y. Liang N. Shimizu

Peridotite

Trace element

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Elevated water concentrations and evidence of small scale heterogeneity in olivine-hosted melt inclusions: Insight into the source of high melt volumes in the Iceland hotspot

AGU Fall Meeting Abstracts (2009)

Mary E. Peterson Christopher J. Stefano N. Shimizu A. J. Kent Samuel B. Mukasa

Melt inclusions

Hotspot (geology)

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Global Variations in Abyssal Peridotite Compositions II: What Determines the Major Element MORB Composition

AGU Fall Meeting Abstracts (2007)

H. J. Dick J. M. Warren N. Shimizu

Peridotite

Abyssal zone

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An assessment of upper mantle heterogeneity based on abyssal peridotite isotopic compositions

Journal of Geophysical Research Atmospheres (2009)

J. M. Warren N. Shimizu Chie Sakaguchi H. J. Dick Eizo Nakamura

Abyssal peridotites, the depleted solid residues of ocean ridge melting, are the most direct samples available to assess upper oceanic mantle composition. We present detailed isotope and trace element analyses of pyroxene mineral separates from Southwest Indian Ridge abyssal peridotites and pyroxenites in order to constrain the size and length scale of mantle heterogeneity. Our results demonstrate that the mantle can be highly heterogeneous to <1 km and even <0.1 m length scales. Examination of Nd isotopes in relation to modal, trace, and major element compositions indicate that the length scales and amplitudes of heterogeneities in abyssal peridotites reflect both ancient mantle heterogeneity and recent modification by melting, melt‐rock reaction and melt crystallization. The isotopic and trace element compositions of pyroxenite veins in this study indicate that they are not direct remnants of recycled oceanic crust, but instead are formed by recent melt crystallization. Combined with existing data sets, the results show that the average global isotopic composition of peridotites is similar to that of mid‐ocean ridge basalts, though peridotites extend to significantly more depleted 143 Nd/ 144 Nd and 87 Sr/ 86 Sr. Standard isotope evolution models of upper mantle composition do not predict the full isotopic range observed among abyssal peridotites, as they do not account adequately for the complexities of ancient and recent melting processes.

Peridotite

Abyssal zone

Trace element

Pyroxene

Fractional crystallization (geology)

10.1029/2008jb006186

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Citations (144)

Geochemical Consequences of Partial Melting at the Core-Mantle Boundary

nag (1999)

N. Shimizu Kei Hirose Y. Fei

Source