Petrogenesis of the Kirkpatrick Basalt, Solo Nunatak, northern Victoria Land, Antarctica, based on isotopic compositions of strontium, oxygen and sulfur
✍ Scribed by Teresa M. Mensing; Gunter Faure; Lois M. Jones; John R. Bowman; Jochen Hoefs
- Publisher
- Springer
- Year
- 1984
- Tongue
- English
- Weight
- 831 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0010-7999
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✦ Synopsis
Chemical and isotopic compositions of Jurassic tholeiites of the Kirkpatrick Basalt Group from Solo Nunatak, northern Victoria Land, indicate that these rocks are contaminated with crustal material. The basalts are fine grained and contain phenocrysts of augite, pigeonite, hypersthene and plagioclase. The flows on Solo Nunatak are chemically more similar to average tholeiite than flows from Mt. Falla and Storm Peak in the Central Transantarctic Mountains (TAM) which appear to be more highly differentiated. Initial 87Sr/86Sr ratios of the flows on Solo Nunatak are high (>0.710) and are similar to those reported for the Kirkpatrick Basalt in the Central TAM. Whole-rock c~80 values are also high, ranging from +6.0 to +9.3%~ and correlate positively with initial 87Sr/86Sr ratios, similar to the Kirkpatrick Basalt in the Central TAM. The correlation between initial 87Sr/86Sr ratios and 6~80 values is explained as the result of simultaneous fractional crystallization and assimilation of a crustal contaminant. Sulfur isotope compositions vary between limits of fia4s=-4.01 to + 3.41%o. Variations in 634S probably resulted from outgassing of SO 2 under varying oxygen fugacities.