The 2005–2006-eruption of the Barren Volcano, Andaman Sea: Evolution of basaltic magmatism in island arc setting of Andaman–Java subduction complex

Quaternary Volcanoes of Indian Subcontinent: An Overview

“…The REE values reported by Chandrashekharam et al, 2009 show that pre-1787 rocks have slightly depleted LREE and a flat HREE and the subsequent eruption had identical patterns with LREE enriched pattern. For the recent eruption a decreasing trend of MgO, CaO, Al 2 O 3 , Fe 2 O 3 and TiO 2 and alkalies against SiO 2 has been observed by Pal et al, 2010. The distribution of trace elements against SiO 2 % also show the restricted and clustering nature of 2005-lava whereas 2006 -lava had an evolved path (Fig.10).…”

“…Major oxides of Barren volcanics of different eruptions reported by many (Shanker et al, 2001, Pal et al, 2010, Sheth et al, 2009Chandrashekharam et al, 2009) show restricted composition ranging from basalt to basaltic andesite ( Fig. 9).…”

“…Barren volcanics, of all the eruptions, are plagioclase phyric basalt and show phenocrysts of plagioclase, olivine and clinopyroxene set in a glassy to microcrystalline matrix of clinopyroxene and plagioclase microlites (Luhr and Halder, 2006, Chandrasekharam et al, 2009, Pal et al, 2010. Pre-historic rock compared to other eruptions is coarsely crystalline and contain abundant plagioclase phenocrysts (Luhr and Halder, 2006).…”

“…Olivine grains of Pre-1787 lava has Fo 75-64 composition, 1787-2005 to 2006 eruption shows wide range with picro-basalt to basalt to basaltic andesite-andesite field (Pal et al, 2010).…”

Chapter 1 Introduction and history of mapping and research

“…Sheth et al (2009) provided a praiseworthy description and documentation of features of the pre-historic volcanoes on Barren Island and established the pre-historic eruptive history. While petrological and geochemical studies of past and current eruptions (Alam et al 2004;Pal et al 2007aPal et al , 2010 have helped to constrain the origin and evolution of subsurface magma; however, poor documentation and incorrect interpretations of the active lava flows and identification of lavas of particular eruptions during the last two decades have left plenty of scope for re-examination and further work (see Chapter 12 for details), partly provided by Bandopadhyay et al (2014). Narcondam has seen much less study (Haldar et al 2007;Pal et al 2007b;Pal & Bhattacharya 2011;Streck et al 2011) after the pioneering work of Hobday & Mallet (1885) and Ball (1888).…”