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Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity

Identification

Public canonical key

doi:10.25911/5d7a27883ecc4

Authors

Patia, Herman

Reported year

2004

Reported language

en

Source type

Thesis (Masters)

First detected

2026-11-09T19:08:54.903039+00:00

Last metadata observation

2026-11-09T19:08:54.903039+00:00

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Documentary abstract — original language

The initial phase (Phase 1 - 19 September 1994 to 16 April 1995) of the current (1994-2003) eruption at Rabaul Caldera occurred with synchronous vulcanian and vulcanian-plinian eruptions from Tavurvur and Vulcan, respectively, on opposing sides of the caldera. A second phase of activity (Phase 2), beginning on 28 November 1995 and continuing until the present (2003), is characterised by intermittent vulcanian and strombolian eruptions that are restricted to Tavurvur, on the northeastern side of Rabaul Caldera...Comparison with dacite magma compositions erupted in 1937-1943, 1878, and during the recent prehistoric era and the presence of plagioclase phenocrysts reflecting older basalt-dacite magma interaction events (i.e., anorthite cores overgrown with thick andesine rims). The petrologic and geochemical observations made in this study indicate the shallow magma system at Rabaul Caldera has been subject to repeated mafic magma injection since, and also during, the latest caldera-fonning eruption about 1400 years BP. The frequency and repeated occurrence of these injections may maintain a near steadystate system that is characterized by the persistent eruption of similar, crystal-poor dacite compositions over the last 1400 years, and the presence at shallow level of a large volume of dacite magma beneath Rabaul Caldera (Finlayson et al., 2003; Mori et al., 1989). The Australian overseas Aid Agency (AusAID), in the form of an AusAID Scholarship Award. The ACT branch of the Geological Society for funding my participation at the 16th Australian Geological Convention held in Adelaide in July 2002. The Department of Mining for paying for air tickets and allowance for my family.

Identifiers

DOI

10.25911/5d7a27883ecc4

HANDLE

1885/7345

OAI

oai:openresearch-repository.anu.edu.au:1885/7345

Documentary context

Documentary family

Thesis

Source-reported types

Thesis (Masters)

Entity mentions are not evidence of legal recognition. Jurisdiction studied is separate from author affiliation country.

Sources

Repository · Record 1 · Record 2 · Record 3

• DOI · https://doi.org/10.25911/5d7a27883ecc4
• Handle · https://hdl.handle.net/1885/7345
• Document · https://openresearch-repository.anu.edu.au/bitstreams/e6192074-31ed-4e37-8455-5ff2e356ebfa/download

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Relevance pending

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