Crustal contamination processes traced by helium isotopes: Examples from the Sunda arc, Indonesia

Gasparon, M, Hilton, DR and Varne, R (1994) Crustal contamination processes traced by helium isotopes: Examples from the Sunda arc, Indonesia. Earth and Planetary Science Letters, 126 1-3: 15-22. doi:10.1016/0012-821X(94)90239-9


Author Gasparon, M
Hilton, DR
Varne, R
Title Crustal contamination processes traced by helium isotopes: Examples from the Sunda arc, Indonesia
Journal name Earth and Planetary Science Letters   Check publisher's open access policy
ISSN 0012-821X
Publication date 1994-01-01
Sub-type Article (original research)
DOI 10.1016/0012-821X(94)90239-9
Open Access Status Not yet assessed
Volume 126
Issue 1-3
Start page 15
End page 22
Total pages 8
Language eng
Subject 1901 Art Theory and Criticism
1906 Geochemistry and Petrology
1908 Geophysics
1900 Earth and Planetary Sciences
2300 Environmental Science
Abstract Helium isotope data have been obtained on well-characterised olivine and clinopyroxene phenocrysts and xenocrysts from thirteen volcanic centres located between central Sumatra and Sumbawa in the Sunda arc of Indonesia. Olivine crystals in mantle xenoliths (lherzolite) from Bukit Telor basalts are primitive (Mg# = 90), and their 3He 4He value ( R RA = 8.8) indicates that the Sumatran mantle wedge is MORB-like in helium isotope composition. All other samples have lower 3He 4He ratios ranging from 8.5RA to 4.5RA, with most (thirteen out of eighteen) following a trend of more radiogenic 3He 4He values with decreasing Mg#. The only exceptions to this trend are phenocrysts from Batur, Agung and Kerinci, which have MORB-like 3He 4He values but relatively low Mg# (Mg# = 70-71), and two highly inclusion-rich clinopyroxenes which have 3He 4He values lower than other samples of similar Mg#. The results indicate that crustal contamination unrelated to subduction in the Sunda arc is clearly recorded in the 3He 4He characteristics of mafic phenocrysts of subaerial volcanics, and that addition of radiogenic helium is related to low-pressure differentiation processes affecting the melts prior to eruption. These conclusions may have widespread applicability and indicate that helium isotope variations can act as an extremely sensitive tracer of upper crustal contamination.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Wed, 03 Feb 2016, 02:16:29 EST by Associate Professor Massimo Gasparon