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1C. R. Webster ; P. R. Mahaffy ; G. J. Flesch ; P. B. Niles ; J. H. Jones ; L. A. Leshin ; S. K. Atreya ; J. C. Stern ; L. E. Christensen ; T. Owen ; H. Franz ; R. O. Pepin ; A. Steele ; C. Achilles ; C. Agard ; J. A. Alves Verdasca ; R. Anderson ; D. Archer ; C. Armiens-Aparicio ; R. Arvidson ; E. Atlaskin ; A. Aubrey ; B. Baker ; M. Baker ; T. Balic-Zunic ; D. Baratoux ; J. Baroukh ; B. Barraclough ; K. Bean ; L. Beegle ; A. Behar ; J. Bell ; S. Bender ; M. Benna ; J. Bentz ; G. Berger ; J. Berger ; D. Berman ; D. Bish ; D. F. Blake ; J. J. Blanco Avalos ; D. Blaney ; J. Blank ; H. Blau ; L. Bleacher ; E. Boehm ; O. Botta ; S. Bottcher ; T. Boucher ; H. Bower ; N. Boyd ; B. Boynton ; E. Breves ; J. Bridges ; N. Bridges ; W. Brinckerhoff ; D. Brinza ; T. Bristow ; C. Brunet ; A. Brunner ; W. Brunner ; A. Buch ; M. Bullock ; S. Burmeister ; M. Cabane ; F. Calef ; J. Cameron ; J. Campbell ; B. Cantor ; M. Caplinger ; J. Caride Rodriguez ; M. Carmosino ; I. Carrasco Blazquez ; A. 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Zeitlin ; R. Zimdar ; M. P. Zorzano Mier
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-07-23Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2J. P. Grotzinger ; D. Y. Sumner ; L. C. Kah ; K. Stack ; S. Gupta ; L. Edgar ; D. Rubin ; K. Lewis ; J. Schieber ; N. Mangold ; R. Milliken ; P. G. Conrad ; D. DesMarais ; J. Farmer ; K. Siebach ; F. Calef, 3rd ; J. Hurowitz ; S. M. McLennan ; D. Ming ; D. Vaniman ; J. Crisp ; A. Vasavada ; K. S. Edgett ; M. Malin ; D. Blake ; R. Gellert ; P. Mahaffy ; R. C. Wiens ; S. Maurice ; J. A. Grant ; S. Wilson ; R. C. Anderson ; L. Beegle ; R. Arvidson ; B. Hallet ; R. S. Sletten ; M. Rice ; J. Bell, 3rd ; J. Griffes ; B. Ehlmann ; R. B. Anderson ; T. F. Bristow ; W. E. Dietrich ; G. Dromart ; J. Eigenbrode ; A. Fraeman ; C. Hardgrove ; K. Herkenhoff ; L. Jandura ; G. Kocurek ; S. Lee ; L. A. Leshin ; R. Leveille ; D. Limonadi ; J. Maki ; S. McCloskey ; M. Meyer ; M. Minitti ; H. Newsom ; D. Oehler ; A. Okon ; M. Palucis ; T. Parker ; S. Rowland ; M. Schmidt ; S. Squyres ; A. Steele ; E. Stolper ; R. Summons ; A. Treiman ; R. Williams ; A. Yingst
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-12-11Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Bays ; Carbon/analysis ; *Exobiology ; *Extraterrestrial Environment ; Geologic Sediments/analysis/classification ; Hydrogen/analysis ; Hydrogen-Ion Concentration ; Iron/analysis/chemistry ; *Mars ; Nitrogen/analysis ; Oxidation-Reduction ; Oxygen/analysis ; Phosphorus/analysis ; Salinity ; Sulfur/analysis/chemistry ; *WaterPublished by: -
3Baker, M. B. ; Hirschmann, M. M. ; Ghiorso, M. S. ; Stolper, E. M.
[s.l.] : Nature Publishing Group
Published 1995Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The peridotite composition used in our experiments (Table 1) approximates 'primitive' upper mantle6 and was made from cleaned mineral separates (olivine (ol), orthopyroxene (opx), cpx and spinel (sp); all ^13 um in size). Design of the single-stage and two-stage ...Type of Medium: Electronic ResourceURL: -
4Baker, M. B. ; Hirschmann, M. M. ; Wasylenki, L. E. ; Stolper, E. M. ; Ghiorso, M. S.
[s.l.] : Nature Publishing Group
Published 1996Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] BAKER ET AL. REPLY - Falloon et al assert that the melts generated in our near-solidus two-stage diamond-aggregate experiments1 represent disequilibrium liquids. Although space limitations prevent us from describing our current experimental work, we address each of their points below. (1) At ...Type of Medium: Electronic ResourceURL: -
5Staff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
6Staff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
7Staff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
8Staff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
9Staff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
10Staff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
11Staff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Chips of basaltic glass from the Juan de Fuca (JDF) ridge were used as starting material for this study. The original glass chips contained 0.35-0.43 wt% dissolved total water (hereafter % refers to wt% unless otherwise specified) as measured by FTIR (Fourier transform infrared spectroscopy; see ...Type of Medium: Electronic ResourceURL: -
12Mader, H. M. ; Zhang, Y. ; Phillips, J. C. ; Sparks, R. S. J. ; Sturtevant, B. ; Stolper, E.
[s.l.] : Nature Publishing Group
Published 1994Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The experiments were carried out (Fig. 1) at the University of Bristol and the California Institute of Technology using shock-tube techniques first proposed in this context by Bennett3 and more recently developed in studies of volcanic jets4, explosive vaporization5 and high-speed dense dusty ...Type of Medium: Electronic ResourceURL: -
13Staff View
ISSN: 1432-0967Source: Springer Online Journal Archives 1860-2000Topics: GeosciencesNotes: Abstract Geochemical data have been interpreted as requiring that a significant fraction of the melting in MORB source regions takes place in the garnet peridotite field, an inference that places the onset of melting at ≥80 km. However, if melting begins at such great depths, most models for melting of the suboceanic mantle predict substantially more melting than that required to produce the 7±1 km thickness of crust at normal ridges. One possible resolution of this conflict is that MORBs are produced by melting of mixed garnet pyroxenite/spinel peridotite sources and that some or all of the “garnet signature” in MORB is contributed by partial melting of garnet pyroxenite layers or veins, rather than from partial melting of garnet peridotite. Pyroxenite layers or veins in peridotite will contribute disproportionately to melt production relative to their abundance, because partial melts of pyroxenite will be extracted from a larger part of the source region than peridotite partial melts (because the solidus of pyroxenite is at lower temperature than that of peridotite and is encountered along an adiabat 15–25 km deeper than the solidus of peridotite), and because melt productivity from pyroxenite during upwelling is expected to be greater than that from peridotite (pyroxenite melt productivity will be particularly high in the region before peridotite begins melting, owing to heating from the enclosing peridotite). For reasonable estimates of pyroxenite and peridotite melt productivities, 15–20% of the melt derived from a source region composed of 5% pyroxenite and 95% peridotite will come from the pyroxenite. Most significantly, garnet persists on the solidus of pyroxenite to much lower pressures than those at which it is present on the solidus of peridotite, so if pyroxenite is present in MORB source regions, it will probably contribute a garnet signature to MORB even if melting only occurs at pressures at which the peridotite is in the spinel stability field. Partial melting of a mixed spinel peridotite/garnet pyroxenite mantle containing a few to several percent pyroxenite can explain quantitatively many of the geochemical features of MORB that have been attributed to the onset of melting in the stability field of garnet lherzolite, provided that the pyroxenite compositions are similar to the average composition of mantle-derived pyroxene-rich rocks worldwide or to reasonable estimates of the composition of subducted oceanic crust. Sm/Yb ratios of average MORB from regions of typical crustal thickness are difficult to reconcile with derivation by melting of spinel peridotite only, but can be explained if MORB sources contain ∼5% garnet pyroxenite. Relative to melting of spinel peridotite alone, participation of model pyroxenite in melting lowers aggregate melt Lu/Hf without changing Sm/Nd ratios appreciably. Lu/Hf-Sm/Nd systematics of most MORB can be accounted for by melting of a spinel peridotite/garnet pyroxenite mantle provided that the source region contains 3–6% pyroxenite with ≥20% modal garnet. However, Lu/Hf-Sm/Nd systematics of some MORB appear to require more complex melting regimes and/or significant isotopic heterogeneity in the source. Another feature of the MORB garnet signature, (230Th)/(238U)〉1, can also be produced under these conditions, although the magnitude of (230Th)/(238U) enrichment will depend on the rate of melt production when the pyroxenite first encounters the solidus, which is not well-constrained. Preservation of high (230Th)/(238U) in aggregated melts of mixed spinel peridotite/garnet pyroxenite MORB sources is most likely if the pyroxenites have U concentrations similar to that expected in subducted oceanic crust or to pyroxenite from alpine massifs and xenoliths. The abundances of pyroxenite in a mixed source that are required to explain MORB Sm/Yb, Lu/Hf, and (230Th)/(238U) are all similar. If pyroxenite is an important source of garnet signatures in MORB, then geochemical indicators of pyroxenite in MORB source regions, such as increased trace element and isotopic variability or more radiogenic Pb or Os, should correlate with the strength of the garnet signature. Garnet signatures originating from melts of the garnet pyroxenite components of mixed spinel peridotite/garnet pyroxenite sources would also be expected to be stronger in regions of thin crust.Type of Medium: Electronic ResourceURL: