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Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation

Herzberg, C. and Asimow, Paul D. (2008) Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation. Geochemistry, Geophysics, Geosystems, 9 (9). 2008GC002057. ISSN 1525-2027. http://resolver.caltech.edu/CaltechAUTHORS:HERggg08

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Abstract

PRIMELT2.XLS software is introduced for calculating primary magma composition and mantle potential temperature (TP) from an observed lava composition. It is an upgrade over a previous version in that it includes garnet peridotite melting and it detects complexities that can lead to overestimates in TP by >100°C. These are variations in source lithology, source volatile content, source oxidation state, and clinopyroxene fractionation. Nevertheless, application of PRIMELT2.XLS to lavas from a wide range of oceanic islands reveals no evidence that volatile-enrichment and source fertility are sufficient to produce them. All are associated with thermal anomalies, and this appears to be a prerequisite for their formation. For the ocean islands considered in this work, TP maxima are typically ~1450–1500°C in the Atlantic and 1500–1600°C in the Pacific, substantially greater than ~1350°C for ambient mantle. Lavas from the Galápagos Islands and Hawaii record in their geochemistry high TP maxima and large ranges in both TP and melt fraction over short horizontal distances, a result that is predicted by the mantle plume model.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2008GC002057DOIUNSPECIFIED
ORCID:
AuthorORCID
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2008 American Geophysical Union. Received: 10 April 2008; Revised: 2 July 2008; Accepted: 15 July 2008; Published: 18 September 2008. Kaj Hoernle and Mike Rhodes are thanked for discussions. We are grateful to John Longhi and Cin-Ty Lee for thoughtful reviews. P.D.A. is supported by the NSF through grant OCE-0550216. Auxiliary material for this article contains a Microsoft Excel workbook called PRIMELT2.XLS in which the primary magma calculations described in this paper are implemented. Additional file information is provided in the readme.txt. The primary magma calculations described in this paper are implemented in this Microsoft Excel workbook, PRIMELT2.XLS. Please note that this workbook uses Visual Basic for Applications (VBA) macros for several of the iterative calculations. As such, it is incompatible with Microsoft Office 2008 for Macintosh, which does not support VBA macros. There may be other incompatibility issues that we are not aware of, but it has been tested on Microsoft Windows XP 2002 using Microsoft Office 2004 and on MacOS 10.4 and 10.5 using Microsoft Office 2004. A user guide is provided in Appendix A2 on implementation of PRIMELT2.XLS.
Funders:
Funding AgencyGrant Number
National Science FoundationOCE-0550216
Subject Keywords:mantle plumes; oceanic island basalts; mantle potential temperature; primary magma
Record Number:CaltechAUTHORS:HERggg08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HERggg08
Official Citation:Herzberg, C., and P. D. Asimow (2008), Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation, Geochem. Geophys. Geosyst., 9, Q09001, doi:10.1029/2008GC002057.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12012
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:18 Oct 2008 04:45
Last Modified:23 Jul 2013 17:59

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