Skip Navigation

This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (82)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by FALLOON, T. J.
Right arrow Articles by DANYUSHEVSKY, L. V.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Petrology Volume 41 Number 2 Pages 257-283 2000
© Oxford University Press 2000

Melting of Refractory Mantle at 1·5, 2 and 2·5 GPa under Anhydrous and H2O-undersaturated Conditions: Implications for the Petrogenesis of High-Ca Boninites and the Influence of Subduction Components on Mantle Melting

TREVOR J. FALLOON,* and LEONID V. DANYUSHEVSKY

SCHOOL OF EARTH SCIENCES, UNIVERSITY OF TASMANIA, GPO BOX 252-79, HOBART, TAS. 7001, AUSTRALIA

Boninites are an important ‘end-member’ supra-subduction zone magmatic suite as they have the highest H2O contents and require the most refractory of mantle wedge sources. The pressure–temperature conditions of boninite origins in the mantle wedge are important to understanding subduction zone initiation and subsequent evolution. Reaction experiments at 1·5 GPa (1350–1530°C), 2 GPa (1400–1600°C) and 2·5 GPa (1450–1530°C) between a model primary high-Ca boninite magma composition and a refractory harzburgite under anhydrous and H2O-undersaturated conditions (2–3 wt % H2O in the melt) have been completed. The boninite composition was modelled on melt inclusions occurring in the most magnesian olivine phenocrysts in high-Ca boninites from the Northern Tongan forearc and the Upper Pillow Lavas of the Troodos ophiolite. Direct melting experiments on a model refractory lherzolite and a harzburgite composition at 1·5 GPa under anhydrous conditions (1400–1600°C) have also been completed. Experiments establish a P, T ‘melting grid’ for refractory harzburgite at 1·5, 2 and 2·5 GPa and in the presence of 2–3 wt % H2O. The effect of 2–3 wt % dissolved H2O produces a liquidus depression in primary boninite of ~112 ± 19°C at a given temperature. The H2O-bearing melts, recalculated to 100 wt % anhydrous, are ~2–6 wt % higher in MgO, ~1–2 wt % higher in SiO2 and ~1–1·5 wt % lower in FeO, compared with nominally anhydrous melts at the same P and T. These differences are consistent with a change in the melting reaction, resulting in a higher contribution of orthopyroxene to the melt phase, compared with anhydrous conditions. We conclude that high-Ca boninite petrogenesis requires temperatures as high as ~1480°C at depths of ~45 km in the mantle wedge; these are constraints for any proposed model of intra-oceanic subduction zones. A comparison of the results from the boninite–harzburgite reaction experiments with the direct melting experiments on refractory lherzolite and harzburgite indicates that the influence of subduction components (included in the composition of the added model boninite) is to cause high-pressure melting cotectics to move towards the olivine apex (i.e. to relatively higher pressures) of the molecular normative projection from diopside onto the base of the ‘basalt tetrahedron’ [Jd + CaTs + Lc–Qz–Ol] compared with anhydrous melting of normal mantle in the absence of a subduction component. The subduction component involved in high-Ca boninite petrogenesis in addition to H2O has relatively high Al2O3 and Na2O contents. The experimental data from this and other studies empirically quantify the absolute effect of dissolved H2O (0·2–21 wt %) on the liquidus depression of olivine-saturated basaltic melts with ~<3 wt % total alkalis as follows:

The equation that describes this empirical relationship is non-linear with an error of ~9 relative percent.

KEY WORDS: high-Ca boninites; mantle melting; H2O-undersaturated melting; olivine liquidus depression; anhydrous melting


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J PetrologyHome page
T. J. Falloon, L. V. Danyushevsky, A. J. Crawford, S. Meffre, J. D. Woodhead, and S. H. Bloomer
Boninites and Adakites from the Northern Termination of the Tonga Trench: Implications for Adakite Petrogenesis
J. Petrology, April 1, 2008; 49(4): 697 - 715.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
A. J. Irving and D. H. Green
Phase Relationships of Hydrous Alkalic Magmas at High Pressures: Production of Nepheline Hawaiitic to Mugearitic Liquids by Amphibole-Dominated Fractional Crystallization Within the Lithospheric Mantle
J. Petrology, April 1, 2008; 49(4): 741 - 756.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
M. K. Reagan, B. B. Hanan, M. T. Heizler, B. S. Hartman, and R. Hickey-Vargas
Petrogenesis of Volcanic Rocks from Saipan and Rota, Mariana Islands, and Implications for the Evolution of Nascent Island Arcs
J. Petrology, March 1, 2008; 49(3): 441 - 464.
[Abstract] [Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
K. D. Putirka
Thermometers and Barometers for Volcanic Systems
Reviews in Mineralogy and Geochemistry, January 1, 2008; 69(1): 61 - 120.
[Full Text] [PDF]

Home page
 J PetrologyHome page
R. Dasgupta, M. M. Hirschmann, and N. D. Smith
Partial Melting Experiments of Peridotite + CO2 at 3 GPa and Genesis of Alkalic Ocean Island Basalts
J. Petrology, November 1, 2007; 48(11): 2093 - 2124.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
O. Jagoutz, O. Muntener, P. Ulmer, T. Pettke, J.-P. Burg, H. Dawood, and S. Hussain
Petrology and Mineral Chemistry of Lower Crustal Intrusions: the Chilas Complex, Kohistan (NW Pakistan)
J. Petrology, October 1, 2007; 48(10): 1895 - 1953.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society of America Special PapersHome page
D. Prelevic, S.F. Foley, and V. Cvetkovic
A review of petrogenesis of Mediterranean Tertiary lamproites: A perspective from the Serbian ultrapotassic province
Geological Society of America Special Papers, January 1, 2007; 418(0): 113 - 129.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society of America Special PapersHome page
T. J. Falloon, D. H. Green, and L. V. Danyushevsky
Crystallization temperatures of tholeiite parental liquids: Implications for the existence of thermally driven mantle plumes
Geological Society of America Special Papers, January 1, 2007; 430(0): 235 - 260.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
J.-F. Deng, M.-F. Zhou, M. F. J. Flower, S.-G. Su, M.-G. Zhai, C. Liu, G.-C. Zhao, X.-G. Zhao, S. Zhou, and Z.-W. Wu
A mechanism for transforming buoyant North Chinese cratonic lithosphere to a denser equivalent for delamination
Geological Society, London, Special Publications, January 1, 2007; 280(1): 317 - 330.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
C. ANNEN, J. D. BLUNDY, and R. S. J. SPARKS
The Genesis of Intermediate and Silicic Magmas in Deep Crustal Hot Zones
J. Petrology, March 1, 2006; 47(3): 505 - 539.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
X. LIU, H. ST. C. O'NEILL, and A. J. BERRY
The Effects of Small Amounts of H2O, CO2 and Na2O on the Partial Melting of Spinel Lherzolite in the System CaO-MgO-Al2O3-SiO2 {+/-} H2O {+/-} CO2 {+/-} Na2O at 1{middle dot}1 GPa
J. Petrology, February 1, 2006; 47(2): 409 - 434.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
D. PRELEVIC, S. F. FOLEY, R. L. ROMER, V. CVETKOVIC, and H. DOWNES
Tertiary Ultrapotassic Volcanism in Serbia: Constraints on Petrogenesis and Mantle Source Characteristics
J. Petrology, July 1, 2005; 46(7): 1443 - 1487.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
S. MATVEEV, M. PORTNYAGIN, C. BALLHAUS, R. BROOKER, and C. A. GEIGER
FTIR Spectrum of Phenocryst Olivine as an Indicator of Silica Saturation in Magmas
J. Petrology, March 1, 2005; 46(3): 603 - 614.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
T. YOSHINO and T. OKUDAIRA
Crustal Growth by Magmatic Accretion Constrained by Metamorphic P-T Paths and Thermal Models of the Kohistan Arc, NW Himalayas
J. Petrology, November 1, 2004; 45(11): 2287 - 2302.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society of America BulletinHome page
S. J. Piercey, D. C. Murphy, J. K. Mortensen, and R. A. Creaser
Mid-Paleozoic initiation of the northern Cordilleran marginal backarc basin: Geologic, geochemical, and neodymium isotope evidence from the oldest mafic magmatic rocks in the Yukon-Tanana terrane, Finlayson Lake district, southeast Yukon, Canada
Geological Society of America Bulletin, September 1, 2004; 116(9-10): 1087 - 1106.
[Abstract] [Full Text] [PDF]

Home page
 Geological MagazineHome page
G. Pe-Piper, G. PE-PIPER, B. TSIKOURAS, and K. HATZIPANAGIOTOU
Evolution of boninites and island-arc tholeiites in the Pindos Ophiolite, Greece
Geological Magazine, July 1, 2004; 141(4): 455 - 469.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
X. LIU and H. ST. C. O'NEILL
Partial Melting of Spinel Lherzolite in the System CaO-MgO-Al2O3-SiO2 {+/-} K2O at 1{middle dot}1 GPa
J. Petrology, July 1, 2004; 45(7): 1339 - 1368.
[Abstract] [Full Text] [PDF]

Home page
 South African Journal of GeologyHome page
S. W. Parman, T. L. Grove, J. C. Dann, and M. J. de Wit
A subduction origin for komatiites and cratonic lithospheric mantle
South African Journal of Geology, June 1, 2004; 107(1-2): 107 - 118.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
F. E. Brenker, F. E. Brenker, A. Meibom, and R. Frei
On the formation of peridotite-derived Os-rich PGE alloys
American Mineralogist, November 1, 2003; 88(11-12): 1731 - 1740.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
M. F. J. Flower and Y. Dilek
Arc-trench rollback and forearc accretion: 1. A collision-induced mantle flow model for Tethyan ophiolites
Geological Society, London, Special Publications, January 1, 2003; 218(1): 21 - 41.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
A. Deschamps and S. Lallemand
Geodynamic setting of Izu-Bonin-Mariana boninites
Geological Society, London, Special Publications, January 1, 2003; 219(1): 163 - 185.
[Abstract] [PDF]

Home page
 J PetrologyHome page
J. M. SINTON, L. L. FORD, B. CHAPPELL, and M. T. McCULLOCH
Magma Genesis and Mantle Heterogeneity in the Manus Back-Arc Basin, Papua New Guinea
J. Petrology, January 1, 2003; 44(1): 159 - 195.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
L. V. DANYUSHEVSKY, S. SOKOLOV, and T. J. FALLOON
Melt Inclusions in Olivine Phenocrysts: Using Diffusive Re-equilibration to Determine the Cooling History of a Crystal, with Implications for the Origin of Olivine-phyric Volcanic Rocks
J. Petrology, September 1, 2002; 43(9): 1651 - 1671.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
T. J. FALLOON, L. V. DANYUSHEVSKY, and D. H. GREEN
Peridotite Melting at 1 GPa: Reversal Experiments on Partial Melt Compositions Produced by Peridotite-Basalt Sandwich Experiments
J. Petrology, December 1, 2001; 42(12): 2363 - 2390.
[Abstract] [Full Text] [PDF]

Home page
 Eur J MineralHome page
D. H. GREEN, T. J. FALLOON, S. M. Eggins, and G. M. YAXLEY
Primary magmas and mantle temperatures
European Journal of Mineralogy, June 1, 2001; 13(3): 437 - 452.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
L. V. DANYUSHEVSKY, S. M. EGGINS, T. J. FALLOON, and D. M. CHRISTIE
H2O Abundance in Depleted to Moderately Enriched Mid-ocean Ridge Magmas; Part I: Incompatible Behaviour, Implications for Mantle Storage, and Origin of Regional Variations
J. Petrology, August 1, 2000; 41(8): 1329 - 1364.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.