Diabasic intrusion and lavas, segregation veins, and magma differentiation at Kahoolawe volcano, Hawaii

Fodor, R. V.; Bauer, G. R.

doi:10.1007/s00710-013-0299-x

Cited by 1 publication

(1 citation statement)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other references, similar origin: Cornwall 1951, Puffer and Horter 1993, Marsh 1995, Philpotts et al (1996, Dragovic and Philpotts 2002, Philpotts and Dickson 2002, Cheadle et al 2004, Greenough and Dostal 1992b, Greenough et al 2004, Ferreira et al 2014. For instance, in Hawaii, segregation veins occur in entirely crystalline diabase and contain ~30 vol.% glass matrix (Fodor and Bauer 2014). The geochemistry of these veins and host basalts is similar to the Paraná volcanic province occurrences.…”

Section: This Workmentioning

confidence: 81%

Paralavas in the Cretaceous Paraná volcanic province, Brazil - A genetic interpretation of the volcanic rocks containing phenocrysts and glass

Baggio

Hartmann

Bello

2016

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

The occurrences of glassy rocks containing long and curved phenocrysts in the Paraná volcanic province, South America, are here interpreted as paralavas. The large number of thin (0.1-0.5 m) dikes and sills of glassy volcanic rocks with hopper, hollow or curved, large crystals of clinopyroxene (up to 10 cm), plagioclase (up to 1 cm), magnetite and apatite are contained in the core of thick (>70 m) pahoehoe flows. They are strongly concentrated in the state of Paraná, coincident with the presence of the large number of dikes in the Ponta Grossa arch. These rocks were previously defined as pegmatites, although other names have also been used. A paralava is here interpreted as the product of melting of basaltic rocks following varied, successive processes of sill emplacement in high-kerogen bituminous shale and ascent of the resultant methane. As the gas reached the lower portion of the most recent lava flow of the volcanic pile, the methane reacted with the silicate and oxide minerals of the host volcanic rock (1,000 ºC) and thus elevated the local temperature to 1,600 ºC. The affected area of host rock remelted (possibly 75 wt.%) and injected buoyantly the central and upper portion of the core. This methane-related mechanism explains the evidence found in the paralavas from this volcanic province, one of the largest in the continents.

show abstract