Melt-peridotite reaction recorded in the chemistry of spinel and melt inclusions in basalt from 43°N, Mid-Atlantic Ridge
Kamenetsky, VS and Crawford, AJ (1998) Melt-peridotite reaction recorded in the chemistry of spinel and melt inclusions in basalt from 43°N, Mid-Atlantic Ridge. Earth and Planetary Science Letters, 164 (1-2). pp. 345-352.
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Official URL: http://dx.doi.org/10.1016/S0012-821X(98)00226-X
Compositions of spinel and grassy melt inclusions in primitive olivine (FO89.3-91) from basalt AII32 D11-177 at 43°N, Mid-Atlantic Ridge fall into two principal groups. The dominant (similar to 90%) Group-I spinel and melt inclusions have typical MORB compositions. In contrast, Group-II. Cr-spinels are strongly enriched in TiO2 (2.6-4.1 wt%), and Group-II melt inclusions show significant enrichment in SiO2 (54.6-58.4 wt%), TiO2, Na2O and K2O, whereas their CaO contents (9.3-11.1 wt%) are unusually low. Group-II melts are also remarkable in crystallizing high-Mg orthopyroxene (Mg# 91). These mineral associations and melt compositions are unusual for MORB, and are interpreted to result from interaction between MORB-like melts and harzburgitic peridotite at low pressure.
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|Keywords:||mid-ocean ridge basalts; melts; inclusions; spinel; peridotites; petrology; east pacific rise; upper-mantle; hess deep; garrett transform; spreading ridges|
|Deposited By:||utas eprints|
|Deposited On:||10 Aug 2006|
|Last Modified:||18 Jul 2008 19:41|
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