Skip Navigation

This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (22)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by GERTISSER, R.
Right arrow Articles by KELLER, J.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Petrology | Volume 44 | Number 3 | Pages 457-489 | 2003
© Oxford University Press 2003

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

R. GERTISSER* and J. KELLER

INSTITUT FÜR MINERALOGIE, PETROLOGIE UND GEOCHEMIE, UNIVERSITÄT FREIBURG, ALBERTSTRASSE 23B, D-79104 FREIBURG, GERMANY

Present address: Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK. Telephone: +44 (0)1908 653012. Fax: +44 (0)1908 655151. E-mail: r.gertisser{at}open.ac.uk

Merapi volcano (Central Java), located within the Quaternary volcanic front of the Sunda arc, is one of the most active volcanoes of the Indonesian archipelago. During the Holocene, Merapi erupted basalts and basaltic andesites of medium-K affinity during its earlier stages of activity and high-K compositions over the past ~1900 years. Merapi lavas and pyroclastic rocks are characterized by enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to high field strength elements (HFSE) and higher 87Sr/86Sr, 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios and lower 143Nd/144Nd ratios compared with Indian Ocean mid-ocean ridge basalt (MORB). Merapi high-K series rocks are enriched in LILE and LREE and slightly depleted in heavy REE (HREE) and HFSE compared with rocks from the medium-K series. The increase in K2O is accompanied by a marked increase in 87Sr/86Sr and a general decrease in 143Nd/144Nd, but not by systematic variations in {delta}18O values. The low {delta}18O nature of the Merapi magmas, and the lack of any major shift in isotopic compositions along the evolutionary trend of the two individual series, precludes extensive crustal assimilation during magma ascent and differentiation, emphasizing the importance of subducted continental material in the genesis of Merapi magmas. The compositional contrast between medium-K and high-K series volcanics largely reflects variable contributions from subducted sediment to the mantle wedge, which was similar to a MORB-source mantle before any subduction-related modification. The temporal change in the K2O content of the magmas reflects compositional variation in the mantle wedge rather than intracrustal processes occurring within the shallow volcanic system.

KEY WORDS: arc magma series; geochemistry; Merapi; sediment subduction; Sunda arc


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Geological MagazineHome page
E. DONOGHUE, V. R. TROLL, L. M. SCHWARZKOPF, G. CLAYTON, and R. GOODHUE
Organic block coatings in block-and-ash flow deposits at Merapi Volcano, central Java
Geological Magazine, January 1, 2009; 146(1): 113 - 120.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
J. P. Chadwick, V. R. Troll, C. Ginibre, D. Morgan, R. Gertisser, T. E. Waight, and J. P. Davidson
Carbonate Assimilation at Merapi Volcano, Java, Indonesia: Insights from Crystal Isotope Stratigraphy
J. Petrology, September 1, 2007; 48(9): 1793 - 1812.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
H. K. Handley, C. G. Macpherson, J. P. Davidson, K. Berlo, and D. Lowry
Constraining Fluid and Sediment Contributions to Subduction-Related Magmatism in Indonesia: Ijen Volcanic Complex
J. Petrology, June 1, 2007; 48(6): 1155 - 1183.
[Abstract] [Full Text] [PDF]

Home page
 ajsHome page
D. P. West Jr., P. B. Tomascak, R. A. Coish, M. G. Yates, and M. J. Reilly
Petrogenesis of the ultrapotassic Lincoln Syenite, Maine: Late Silurian-Early Devonian melting of a source region modified by subduction driven metasomatism
Am J Sci, January 1, 2007; 307(1): 265 - 310.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
G. R. DAVIES, A. J. STOLZ, I. L. MAHOTKIN, G. M. NOWELL, and D. G. PEARSON
Trace Element and Sr-Pb-Nd-Hf Isotope Evidence for Ancient, Fluid-Dominated Enrichment of the Source of Aldan Shield Lamproites
J. Petrology, June 1, 2006; 47(6): 1119 - 1146.
[Abstract] [Full Text] [PDF]

Home page
 Mineral MagHome page
K. M. Goodenough, B. N. Young, and I. Parsons
The minor intrusions of Assynt, NW Scotland: early development of magmatism along the Caledonian Front
Mineralogical Magazine, August 1, 2004; 68(4): 541 - 559.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.