|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, U.S.A.
This study explores the controls of temperature, pressure, and silicate melt composition on S solubility in silicate liquids. The solubility of S in FeO-containing silicate melts in equilibrium with metal sulfide increases significantly with increasing temperature but decreases with increasing pressure. The silicate melt structure also exercises a control on S solubility. Increasing the degree of polymerization of the silicate melt structure lowers the S solubility in the silicate liquid. The new set of experimental data is used to expand the model of Mavrogenes and O’Neill (1999) for S solubility in silicate liquids by incorporating the influence of the silicate melt structure. The expected S solubility in the ascending magma is calculated using the expanded model. Because the negative pressure dependence of S solubility is more influential than the positive temperature dependence, decompression and adiabatic ascent of a formerly S-saturated silicate magma will lead to S undersaturation. A primitive magma that is S-saturated in its source region will, therefore, become S-undersaturated as it ascends to shallower depth. In order to precipitate magmatic sulfides, the magma must first cool and undergo fractional crystallization to reach S saturation. The S content in a metallic liquid that is in equilibrium with a magma ocean that contains ~200 ppm S (i.e., Earth’s bulk mantle S content) ranges from 5.5 to 12 wt% S. This range of S values encompasses the amount of S (9 to 12 wt%) that would be present in the outer core if S is the light element. Thus, the Earth’s proto-mantle could be in equilibrium (in terms of the preserved S abundance) with a core-forming metallic phase.
This article has been cited by other articles:
|
|
 |
|
  C. Li and E. M. Ripley Sulfur Contents at Sulfide-Liquid or Anhydrite Saturation in Silicate Melts: Empirical Equations and Example Applications Economic Geology, May 1, 2009; 104(3): 405 - 412. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 N. Metrich and P. J. Wallace Volatile Abundances in Basaltic Magmas and Their Degassing Paths Tracked by Melt Inclusions Reviews in Mineralogy and Geochemistry, January 1, 2008; 69(1): 363 - 402. [Full Text] [PDF]
|
|
|
|
|
|
E. M. Ripley, A. Sarkar, and C. Li Mineralogic and Stable Isotope Studies of Hydrothermal Alteration at the Jinchuan Ni-Cu Deposit, China Economic Geology, October 1, 2005; 100(7): 1349 - 1361. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 P. J. JUGO, R. W. LUTH, and J. P. RICHARDS An Experimental Study of the Sulfur Content in Basaltic Melts Saturated with Immiscible Sulfide or Sulfate Liquids at 1300{degrees}C and 1{middle dot}0 GPa J. Petrology, April 1, 2005; 46(4): 783 - 798. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. CLEMENTE, B. SCAILLET, and M. PICHAVANT The Solubility of Sulphur in Hydrous Rhyolitic Melts J. Petrology, November 1, 2004; 45(11): 2171 - 2196. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Bockrath, C. Ballhaus, and A. Holzheid Fractionation of the Platinum-Group Elements During Mantle Melting Science, September 24, 2004; 305(5692): 1951 - 1953. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. J. Chazey III and C. R. Neal Large igneous province magma petrogenesis from source to surface: platinum-group element evidence from Ontong Java Plateau basalts recovered during ODP Legs 130 and 192 Geological Society, London, Special Publications, January 1, 2004; 229(1): 219 - 238. [Abstract] [PDF]
|
|
|
|
|
|
E. M. Ripley and C. Li SULFUR ISOTOPE EXCHANGE AND METAL ENRICHMENT IN THE FORMATION OF MAGMATIC Cu-Ni-(PGE) DEPOSITS Economic Geology, May 1, 2003; 98(3): 635 - 641. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. W. Sisson Native gold in a Hawaiian alkalic magma Economic Geology, May 1, 2003; 98(3): 643 - 648. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. M. Ripley, E. M. Ripley, C. Li, and D. Shin Paragneiss Assimilation in the Genesis of Magmatic Ni-Cu-Co Sulfide Mineralization at Voisey's Bay, Labrador: {delta}34S, {delta}13C, and Se/S Evidence Economic Geology, September 1, 2002; 97(6): 1307 - 1318. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
