Vögelin, Andrea; Pettke, Thomas; Greber, Nicolas; von Niederhäusern, Brigitte; Nägler, Thomas (2014). Magma differentiation fractionates Mo isotope ratios: Evidence from the Kos Plateau Tuff (Aegean Arc). Lithos, 190-191, pp. 440-448. Elsevier 10.1016/j.lithos.2013.12.016
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We investigated high temperature Mo isotope fractionation in a hydrous supra-subduction volcano-plutonic system (Kos, Aegean Arc, Greece) in order to address the debate on the δ98/95Mo variability of the continental crust. In this igneous system, where differentiation is interpreted to be dominated by fractional crystallization, bulk rock data from olivine basalt to dacite show δ98/95Mo ratios increasing from +0.3 to +0.6‰ along with Mo concentrations increasing from 0.8 to 4.1 μg g−1. Data for hornblende and biotite mineral separates reveal the extraction of light Mo into crystallizing silicates, with minimum partition coefficients between hornblende- silicate melt and biotite-silicate melt of 0.6 and 0.4 δ98/95Mo, respectively.
Our data document significant Mo isotope fractionation at magmatic temperatures, hence, the igneous contribution to continental runoff is variable, besides probable source-related variability. Based on these results and published data an average continental δ98/95Mo of +0.3 to +0.4‰ can be derived. This signature corresponds more closely to the average of published data of dissolved Mo loads of large rivers than previous estimates and is consistent with an upper limit of δ98/95Mo = 0.4‰ of the Earth's upper crust as derived from the analysis of molybdenites.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Institute of Geological Sciences 08 Faculty of Science > Institute of Geological Sciences > Isotope Geology 08 Faculty of Science > Institute of Geological Sciences > Rock-Water Interaction |
UniBE Contributor: |
Vögelin, Andrea, Pettke, Thomas, Greber, Nicolas, von Niederhäusern, Brigitte, Nägler, Frank Thomas |
Subjects: |
500 Science > 550 Earth sciences & geology |
ISSN: |
0024-4937 |
Publisher: |
Elsevier |
Funders: |
[4] Swiss National Science Foundation |
Language: |
English |
Submitter: |
Nicolas Greber |
Date Deposited: |
26 Mar 2014 14:19 |
Last Modified: |
02 Mar 2023 23:24 |
Publisher DOI: |
10.1016/j.lithos.2013.12.016 |
BORIS DOI: |
10.7892/boris.45313 |
URI: |
https://boris.unibe.ch/id/eprint/45313 |
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