Trace Element and Sr, Nd, Pb and O Isotope Variations in Medium-K and High-K Volcanic Rocks from Merapi Volcano, Central Java, Indonesia: Evidence for the Involvement of Subducted Sediments in Sunda Arc Magma Genesis

Gertisser, Ralf

doi:10.1093/petrology/44.3.457

Cited by 168 publications

(135 citation statements)

References 95 publications

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“…Table 8) that argue for variable source enrichment related to the fluid flux from the slab. Therefore, a slightly higher degree of partial melting induced by a higher water flux from the slab may account for lower abundances of immobile trace elements (Gertisser and Keller 2003). Indeed, the rocks studied are substantially enriched in continental crust-like components when compared with calc-alkaline series elsewhere within the same geotectonic zone (e.g., the Sierra de Córdoba andesites, Pin et al 2002).…”

Section: Significance Of the Geochemical Datamentioning

confidence: 96%

The northern Ossa-Morena Cadomian batholith (Iberian Massif): magmatic arc origin and early evolution

Bandrés

Eguíluz

et al. 2004

Int J Earth Sci (Geol Rundsch)

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Diorites and related rocks in the MØrida area of northern Ossa-Morena (SW Iberia) are intrusive into Precambrian metavolcanic and metasedimentary sequences. Cumulate products from the H 2 O-rich magmas are amphibole-rich gabbros to hornblendites. Major and trace element compositions, including Sr and Nd isotope data, allow the definition of a calc-alkaline series likely formed in relation to an immature arc setting. Crystallization of the intrusives has been established between ca. 570 and 580 Ma by U-Pb dating of constituent zircons. Garnet growth in dioritic rocks reflects a tectonothermal overprint dated by Sm-Nd internal isochrons at around 555 Ma. Older Sm-Nd and Lu-Hf results between ca. 593 and 637 Ma on the same rocks suggest an earlier stage of regional metamorphism within the arc environment. The northern Ossa-Morena composite batholith and related metamorphic units have been tectonized and dismembered in the course of subsequent low-grade events during final stages of the Cadomian orogeny and the Variscan cycle. The units studied represent a well preserved segment of the arc region that evolved in Neoproterozoic times along the western border of Gondwana to conform the Cadomian-Avalonian basement of the Hercynian realm.

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Section: Significance Of the Geochemical Datamentioning

confidence: 96%

The northern Ossa-Morena Cadomian batholith (Iberian Massif): magmatic arc origin and early evolution

Bandrés

Eguíluz

et al. 2004

Int J Earth Sci (Geol Rundsch)

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“…8; Gertisser and Keller 2003a). This increase in K 2 O at a given SiO 2 content of the eruptive products is accompanied by changes in other element concentrations, such as Rb and Ba, and Sr isotopic ratios, and has been attributed to variations in the source characteristics of the primary magmas of the two series (Gertisser and Keller 2003b). The timing of the MK to HK transition appears to hold with the new geochemical data obtained for the lava samples dated by the K-Ar method, although, as already pointed out, age information for postSomma-Merapi lavas is still limited.…”

Section: Geochemical Evolution Of Merapimentioning

confidence: 97%

“…MK and HK series were initially defined based on variations in K 2 O content observed in lavas of the SommaMerapi, pyroclastic rocks of the HPS and the historical and recent eruptive products (Gertisser and Keller 2003b). Here, we expand the discussion of the compositional variations of the Merapi rocks to the earliest eruptive products of the two Proto-Merapi edifices (Fig.…”

Section: Geochemical Evolution Of Merapimentioning

confidence: 99%

The geological evolution of Merapi volcano, Central Java, Indonesia

et al. 2012

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“…Melt inclusion (MI) data represent EMP point analyses of MI in pyroxene or olivine in Agung scoria fall samples. Compositional fields for Batur Nicholls 2004b, 2005), Rinjani (Foden 1983), Bratan (Ryu et al 2013) and Merapi (Costa et al 2013;Gertisser and Keller 2003a;Preece et al 2013) given for reference. Two separate Merapi fields represent medium-and high-K series, typically the older (>1.9 ka) and younger (<1.9 ka) Merapi deposits respectively, as defined by Gertisser and Keller (2003a) Self and King (1996), i.e.…”

Section: Stratigraphy and Bulk Geochemistry Of Pyroclastic Depositsmentioning

confidence: 99%

A 5000-year record of multiple highly explosive mafic eruptions from Gunung Agung (Bali, Indonesia): implications for eruption frequency and volcanic hazards

et al. 2015

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The 1963 AD eruption of Agung volcano was one of the most significant twentieth century eruptions in Indonesia, both in terms of its explosivity (volcanic explosivity index (VEI) of 4+) and its short-term climatic impact as a result of around 6.5 Mt SO2 emitted during the eruption. Because Agung has a significant potential to generate more sulphur-rich explosive eruptions in the future and in the wake of reported geophysical unrest between 2007 and 2011, we investigated the Late Holocene tephrostratigraphic record of this volcano using stratigraphic logging, and geo-chemical and geochronological analyses. We show that Agung has an average eruptive frequency of one VEI >= 2-3 eruptions per century. The Late Holocene eruptive record is dominated by basaltic andesitic eruptions generating tephra fall and pyroclastic density currents. About 25 % of eruptions are of similar or larger magnitude than the 1963 AD event, and this includes the previous eruption of 1843 AD (estimated VEI 5, contrary to previous estimations of VEI 2). The latter represents one of the chemically most evolved products (andesite) erupted at Agung. In the Late Holocene, periods of more intense explosive activity alternated with periods of background eruptive rates similar to those at other subduction zone volcanoes. All eruptive products at Agung show a texturally complex mineral assemblage, dominated by plagioclase, clinopyroxene, orthopyroxene and olivine, suggesting recurring open-system processes of magmatic differentiation. We propose that erupted magmas are the result of repeated intrusions of basaltic magmas into basaltic andesitic to andesitic reservoirs producing a hybrid of bulk basaltic andesitic composition with limited compositional variations

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Trace Element and Sr, Nd, Pb and O Isotope Variations in Medium-K and High-K Volcanic Rocks from Merapi Volcano, Central Java, Indonesia: Evidence for the Involvement of Subducted Sediments in Sunda Arc Magma Genesis

Cited by 168 publications

References 95 publications

The northern Ossa-Morena Cadomian batholith (Iberian Massif): magmatic arc origin and early evolution

The northern Ossa-Morena Cadomian batholith (Iberian Massif): magmatic arc origin and early evolution

The geological evolution of Merapi volcano, Central Java, Indonesia

A 5000-year record of multiple highly explosive mafic eruptions from Gunung Agung (Bali, Indonesia): implications for eruption frequency and volcanic hazards

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