Abstract
Strontium isotopic compositions were determined in thirty-two volcanic rock samples collected in thirteen volcanic centers of the 41°30′ - 46°S region of the Southern Volcanic Zone (SVZ) of the Andes. This region is just north of the Chilean triple junction, where the Chile Rise subducts under the South American plate. The along-arc variation of 87Sr/86Sr ratios of volcanic rocks from the SVZ (33°S-46°S) is complex and shows a wave-like pattern, which does not correlate either with the age pattern of the subducted Nazca plate or with the thickness of the continental crust. Furthermore, the variation of the Sr-isotope composition in along-arc direction does not seem to correspond to those of other geochemical parameters examined up to now of SVZ rocks. We interpret this Sr-isotopic variation in terms of either locally different crust-magma interactions or heterogeneities in the mantle wedge. Effects of subduction of the Chile Rise on the 87Sr/86Sr ratios are not obvious.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
