CaltechAUTHORS
  A Caltech Library Service

Geophysical source conditions for basaltic lava from Santorini volcano based on geochemical modeling

Baziotis, Ioannis and Kimura, Jun-Ichi and Pantazidis, Avgoustos and Klemme, Stephan and Berndt, Jasper and Asimow, Paul (2018) Geophysical source conditions for basaltic lava from Santorini volcano based on geochemical modeling. Lithos, 316-317 . pp. 295-303. ISSN 0024-4937. http://resolver.caltech.edu/CaltechAUTHORS:20180730-095303577

[img] PDF - Accepted Version
See Usage Policy.

8Mb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20180730-095303577

Abstract

Santorini volcano sits ~145 km above the Aegean Wadati-Benioff zone, where the African plate subducts northward beneath Eurasia. There are only a few localities in the whole Aegean where basaltic lavas primitive enough to constrain mantle processes beneath the Aegean arc can be found; in this work we analyzed one such locality, a basalt lava from the southern part of Santorini. We apply a suite of petrological tools (PRIMACALC2 and ABS5) in sequence to estimate magma chamber conditions, primary magma composition, mantle melting conditions, and slab dehydration conditions. Back-calculation modeling based on major-element chemistry yields shallow magma chamber conditions of P = 0.02 GPa, fO_2 = QFM + 2, and ~1 wt% H_2O in the primary magma. The estimated major element composition of this primary magma then leads to estimated mantle melting conditions of 2.1 GPa, 1353 °C, and F = 8%; whereas a more precise estimate derived from trace elementmodeling implies 1.7 GPa, 1323 °C, and F = 18%. Furthermore, the trace element model implies a slab flux derived from 4.6 GPa (~150 km slab depth). The estimated slab depth, magma segregation conditions, and magma chamber depth are all consistent with seismic observations, supporting slab dehydration in the seismically imaged steep slab interval and flux melting in a relatively hot mantle wedge.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.lithos.2018.07.027DOIArticle
ORCID:
AuthorORCID
Asimow, Paul0000-0001-6025-8925
Additional Information:© 2018 Elsevier B.V. Received 26 April 2018, Accepted 26 July 2018, Available online 30 July 2018. J.I.-K. was funded by JSPS KAKENHI grant #JP15H02148, #JP16H01123, and #JP18H04372. PDA's participation in this study was funded by the US NSF, award EAR-1550934. We are grateful for the editorial handling by Andrew Kerr, and the fruitful comments made by two anonymous reviewers.
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)JP15H02148
Japan Society for the Promotion of Science (JSPS)JP16H01123
Japan Society for the Promotion of Science (JSPS)JP18H04372
NSFEAR-1550934
Record Number:CaltechAUTHORS:20180730-095303577
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180730-095303577
Official Citation:Ioannis Baziotis, Jun-Ichi Kimura, Avgoustos Pantazidis, Stephan Klemme, Jasper Berndt, Paul D. Asimow, Geophysical source conditions for basaltic lava from Santorini volcano based on geochemical modeling, Lithos, Volumes 316–317, 2018, Pages 295-303, ISSN 0024-4937, https://doi.org/10.1016/j.lithos.2018.07.027. (http://www.sciencedirect.com/science/article/pii/S0024493718302664)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88350
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Jul 2018 17:11
Last Modified:13 Aug 2018 15:28

Repository Staff Only: item control page