Amphibole megacrysts as a probe into the deep plumbing system of Merapi volcano, Central Java, Indonesia

  • Stefan T. M. Peters
  • Valentin R. Troll
  • Franz A. Weis
  • Luigi Dallai
  • Jane P. Chadwick
  • Bernhard Schulz
Original Paper

Abstract

Amphibole has been discussed to potentially represent an important phase during early chemical evolution of arc magmas, but is not commonly observed in eruptive arc rocks. Here, we present an in-depth study of metastable calcic amphibole megacrysts in basaltic andesites of Merapi volcano, Indonesia. Radiogenic Sr and Nd isotope compositions of the amphibole megacrysts overlap with the host rock range, indicating that they represent antecrysts to the host magmas rather than xenocrysts. Amphibole-based barometry suggests that the megacrysts crystallised at pressures of >500 MPa, i.e., in the mid- to lower crust beneath Merapi. Rare-earth element concentrations, in turn, require the absence of magmatic garnet in the Merapi feeding system and, therefore, place an uppermost limit for the pressure of amphibole crystallisation at ca. 800 MPa. The host magmas of the megacrysts seem to have fractionated significant amounts of amphibole and/or clinopyroxene, because of their low Dy/Yb ratios relative to the estimated compositions of the parent magmas to the megacrysts. The megacrysts’ parent magmas at depth may thus have evolved by amphibole fractionation, in line with apparently coupled variations of trace element ratios in the megacrysts, such as e.g., decreasing Zr/Hf with Dy/Yb. Moreover, the Th/U ratios of the amphibole megacrysts decrease with increasing Dy/Yb and are lower than Th/U ratios in the basaltic andesite host rocks. Uranium in the megacrysts’ parent magmas, therefore, may have occurred predominantly in the tetravalent state, suggesting that magmatic fO2 in the Merapi plumbing system increased from below the FMQ buffer in the mid-to-lower crust to 0.6–2.2 log units above it in the near surface environment. In addition, some of the amphibole megacrysts experienced dehydrogenation (H2 loss) and/or dehydration (H2O loss), as recorded by their variable H2O contents and D/H and Fe3+/Fe2+ ratios, and the release of these volatile species into the shallow plumbing system may facilitate Merapi’s often erratic eruptive behaviour.

Keywords

Magmatic differentiation Rare-earth elements Arc magmas Barometry Dehydrogenation Dehydration 

Notes

Acknowledgements

We are grateful for the insightful comments by Othmar Müntener, Jon Davidson, Szabolcs Harangi, and two anonymous reviewers that helped to significantly improve the manuscript. This work furthermore benefited from discussions with John Hora, Pieter Vroon, Gareth Davies, Hans Annersten, Frances Deegan, Carsten Münker, and Sophie Omidian. We thank Henrik Skogby for his help with the IR and Mössbauer analysis. Support by the petrology department of VU University Amsterdam to S.P., the department of applied mineralogy at Erlangen to B.S., and the Swedish Science Foundation to V.R.T. (field sampling, sample preparation and D analyses) are gratefully acknowledged. In addition, S.P. and V.R.T. acknowledge financial support by the “U4” collaboration network of the German Academic Exchange Service (DAAD), in which Göttingen and Uppsala universities are active partners.

Supplementary material

410_2017_1338_MOESM1_ESM.xlsx (209 kb)
Appendix 1: Complete EMP data set with amphibole formulas and pressure calculations (XLSX 209 KB)
410_2017_1338_MOESM2_ESM.pdf (211 kb)
Appendix 2: Trace element concentrations in amphibole megacrysts normalised to their host magmas (PDF 210 KB)
410_2017_1338_MOESM3_ESM.pdf (71 kb)
Appendix 3: Mössbauer parameters (PDF 70 KB)
410_2017_1338_MOESM4_ESM.pdf (449 kb)
Appendix 4: Crystallisation temperatures of the amphibole megacrysts estimated from their major element compositions (PDF 449 KB)
410_2017_1338_MOESM5_ESM.docx (371 kb)
Appendix 5: DDy/Yb vs DLa/Yb from literature studies (DOCX 370 KB)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Stefan T. M. Peters
    • 1
    • 2
  • Valentin R. Troll
    • 3
  • Franz A. Weis
    • 4
  • Luigi Dallai
    • 5
  • Jane P. Chadwick
    • 2
    • 6
  • Bernhard Schulz
    • 7
  1. 1.Abteilung IsotopengeologieGeowissenschaftliches Zentrum der Georg-August-Universität GöttingenGöttingenGermany
  2. 2.Faculteit der Aard- en LevenswetenschappenVrije Universiteit AmsterdamHV AmsterdamThe Netherlands
  3. 3.Department of Earth Sciences, Section for Mineralogy, Petrology and TectonicsUppsala UniversityUppsalaSweden
  4. 4.Department of GeosciencesSwedish Museum of Natural HistoryStockholmSweden
  5. 5.CNR-Istituto di Geoscienze e GeorisorsePisaItaly
  6. 6.Science Gallery, Trinity College DublinDublinIreland
  7. 7.Institut für Mineralogie, TU Bergakademie FreibergFreibergGermany

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