バジャワ地域のスコリヤ丘群のFe-Ti酸化物に関する岩石学的研究:インドネシアのバジャワ地熱地域熱源マグマ混合の証拠

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  • Petrology of Fe-Ti oxides in the Bajawa Cinder Cone Complex: Evidence of multi-stage magma as a heat source for Bajawa geothermal field, Indonesia

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The Fe-Ti oxides from the andesitic volcanic rocks of the Bajawa Cinder Cone Complex display the invading of higher temperature and more mafic basaltic magma into the magma chamber. There were three batches of magma (0.73-0.49Ma, 0.43-0.23Ma and 0.20-0.14Ma) in the long life of the Bajawa Cinder Cone Complex. After the magma mixing occurred in the early crystallization of each magma batch, the well-mixed magma was placed in a normal fractionation crystallization state. The end products of magma mixing in the Bajawa Cinder Cone Complex before the eruption were in chemically equilibrium state at a temperature range of 797 to 997°C (average of 900°C). The magma batch 03 of the latest stage (0.14Ma) indicates a narrow temperature range of 865-928°C. It means that the magma of 0.14Ma eruption was well mixed and attained to equilibrium. The cooling rate in the last magma chamber of the Bajawa Cinder Cone Complex was approximately 2.7°C/1000 years (375°C/0.14Ma) from 0.14Ma to present with the assumption of magma temperatures of 900°C at 0.14Ma and 525°C at present.

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