Tectonic, volcanic and stratigraphic geology of the Bajawa geothermal field, central Flores, Indonesia

Muraoka, Hirofumi; Nasution, Asnawir; Urai, Minoru; Takahashi, Masaaki; Takashima, Isao; Simanjuntak, Janes; Sundhoro, Herry; Aswin, Dany; Nanlohy, Fredy; Sitorus, Kastiman; Takahashi, Hiroshi; Koseki, Takehiro

doi:10.9795/bullgsj.53.109

Cited by 24 publications

(27 citation statements)

References 22 publications

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“…Smaller clasts are compact and contain ash fragments finer than 1 mm in diameter. These pyroclastic materials may probably be categorized as products of Strombolian eruptions (Muraoka et al, 2002a).…”

Section: Geologic and Volcanic Settingmentioning

confidence: 99%

“…The eastern flanks of the scoria deposit collapsed from their crest, and the vacated area then hosted the Hamilton (1979), Silver et al (1983), Hall andNichols (1990), andMilsom et al (1992). ( Bajawa Cinder Cone Complex along the NNW SSE trending rift zone (Muraoka et al, 2002a(Muraoka et al, , 2002b. All the effusive rocks from the rift zone, including the volcanic rocks of the NNW SSE trending volcanoes and the cinder cone complex, are very homogenous in their andesitic, calc alkaline nature (Muraoka et al, 2002b).…”

Section: Geologic and Volcanic Settingmentioning

confidence: 99%

“…The Bajawa Cinder Cone Complex is defined by Muraoka et al (2002a) as numerous cinder cones in the Bajawa area, Flores, Indonesia. The cones' features are distinguishable through remote sensing by SAR imagery and on aerial photographs (e.g., Hamilton, 1979;Silver et al, 1983;Muraoka et al, 2002a).…”

Section: Introductionmentioning

confidence: 99%

“…The cones' features are distinguishable through remote sensing by SAR imagery and on aerial photographs (e.g., Hamilton, 1979;Silver et al, 1983;Muraoka et al, 2002a). There are more than 60 such cones in the Bajawa Cinder Cone Complex, distributed from north to south for almost 20 km (Muraoka et al, 2002a).…”

Section: Introductionmentioning

confidence: 99%

“…The complex consists of three lithologic units: the Mataloko, Bobo, and Inie Lika andesites (Muraoka et al, 2002a(Muraoka et al, , 2002b. These units are conventionally distinguished from each other by spatial clustering; there are, however, no other specific differences among them, and all three units are stratigraphically and geochemically ascribed to a cognate origin (Muraoka et al, 2002b).…”

Section: Introductionmentioning

confidence: 99%

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Morphometric age and petrological characteristics of volcanic rocks from the Bajawa Cinder Cone Complex, Flores, Indonesia

Sucipta

Takashima

Muraoka

2006

Journal of Mineralogical and Petrological Sciences

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The Bajawa Cinder Cone Complex consists of at least 78 cinder cones, which can be grouped into five morphometric ages. The oldest group, Bajawa 01, is dated between 0.53 and 0.73 Ma. The groups Bajawa 02, 03, and 04 have an age range from 0.41 Ma to 0.51 Ma, 0.32 Ma to 0.40 Ma, and 0.22 Ma to 0.31 Ma, respectively; the youngest cinder cone group, Bajawa 05, is aged between 0 and 0.20 Ma.Three batches of magma have contributed to the long eruptive episode of the complex. Magma mixing and fractional crystallization were important processes in differentiation. Magma mixing may have been caused by recharge of a mafic contributor to form a mixed magma in a temperature range of 836 °C 978 °C and at a pressure of less than 1.25 kbar before eruption.

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Section: Geologic and Volcanic Settingmentioning

confidence: 99%