Chemical and isotopic variations in an iron-rich lava flow from the Kirkpatrick Basalt, north Victoria Land, Antarctica: implications for low-temperature alteration
Article Abstract:
The lava flow from the uppermost magma pile of the Kirkpatrick Basalt exhibited varying chemical and isotopic concentrations. The uneven distribution of elements and isotopes such as Sr, O and H in the region resulted from the low-temperature modification of glassy matrix materials either during the Jurassic or mid-Cretaceous period. Moreover, paleomagnetic components indicating argon-loss showed that the translocation of Rb occurred during the mid-Cretaceous. These results revealed that a post-magmatic alteration mechanism was involved in the formation of the basalts and other similar structures in the region.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Anhydrous PT phase relations of an Aleutian high-MgO basalt: an investigation of the role of olivine-liquid reaction in the generation of arc high-alumina basalts
Article Abstract:
An analysis of experiments performed on high-magnesia basalt (HMB) is presented. The anhydrous 1 atm and piston-cylinder experiments were conducted to determine possible links between arc high-alumina basalts andless common HMBs. It is shown that olivine may be integrated into the liquidus of such compositions by water inclusion. In addition, this inclusion will generate an impact on the effect of bulk CaO, MgO and Al2O3.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Sector-zone augite megacrysts in Aleutian high alumina basalts: implications for the conditions of basalt crystallization and the generation of calc-alkaline series magmas
Article Abstract:
Large megacrysts of sector-zoned augite contained in high alumina basalts from the Aleutian volcanic centers of Cold Bay and Kanaga Island were investigated. Results indicated a significant water vapor exsolution before eruption. Moreover, the presence of sector-zoned augite can be attributed to augite supersaturation and rapid crystallization resulting from magma decompression and volatile water vapor exsolution.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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