Computer Science
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..48..111f&link_type=abstract
Earth and Planetary Science Letters, Volume 48, Issue 1, p. 111-123.
Computer Science
29
Scientific paper
FAMOUS basalt 527-1-1 (a high-Mg oceanic pillow basalt) has three generations of spinel which can be distinguished petrographically and chemically. The first generation (Group I) have reaction coronas and are high in Al2O3. The second generation (Group II) have no reaction coronas and are high in Cr2O3 and the third generation (Group III) are small, late-stage spinels with intermediate Al2O3 and Cr2O3. Experimental synthesis of spinels from fused rock powder of this basalt was carried out at temperatures of 1175-1270°C and oxygen fugacities of 10-5.5 to 10-10 atm at 1 atm pressure. Spinel is the liquidus phase at oxygen fugacities of 10-8.5 atm and higher but it does not crystallize at any temperature at oxygen fugacities less than 10-9.5. The composition of our spinels synthesized at 1230-1250°C and 10-9 atm fO2 are most similar to the high-Cr spinels (Group II) found in the rock. Spinels synthesized at 1200°C and 10-8.5 atm O2 are chemically similar to the Group III spinels in 527-1-1. We did not synthesize spinel at any temperature or oxygen fugacity that are similar to the high-Al (Group I) spinel found in 527-1-1. These results indicate that the high-Cr (Group II) spinel is the liquidus phase in 527-1-1 at low pressure and Group III spinel crystallize below the liquidus (~1200°C) after eruption of the basalt on the sea floor. The high-Al spinel (Group I) could have crystallized at high pressure or from a magma enriched in Al and perhaps Mg compared to 527-1-1.
Bence A. E.
Fisk Martin R.
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