Universität zu Köln

Leitzke, Felipe P., Fonseca, Raul O. C. ORCID: 0000-0002-0897-4884, Michely, Lina T., Sprung, Peter ORCID: 0000-0003-4862-1415, Muenker, Carsten, Heuser, Alexander ORCID: 0000-0003-3772-5534 and Blanchard, Henrik (2016). The effect of titanium on the partitioning behavior of high-field strength elements between silicates, oxides and lunar basaltic melts with applications to the origin of mare basalts. Chem. Geol., 440. S. 219 - 239. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-6836

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Abstract

A specific feature of some basaltic lunar rocks is that their TiO2 contents can reach concentrations as high as 16 wt%. The high-field strength elements (HFSE) group, which includes Ti, may provide valuable information of the processes that occurred in the lunar mantle to generate high-Ti mare basalts. To assess the effect of such high TiO2 concentrations on the partitioning of Zr, Hf, Nb, Ta, U, Th, Mo and W between major silicate and oxide phases and silicate melts, we present results from experiments at one atmosphere and 1100 degrees C-1305 degrees C, under controlled oxygen fugacity. With the exception of Nb, all D-HFSE (cpx/melt) show a strong negative correlation with the TiO2 content of the silicate melt. Olivine/Silicate melt partition coefficients for Zr, Hf, Nb, Ta and Th decrease slightly from 0 to ca. 5 wt.% TiO2, above which they remain constant up to ca. 20 wt.% TiO2 in the silicate glass. In addition, redox sensitive elements, i.e. U, Mo, and W show clearly distinct D(M)(silicates/)melt at different fO(2), implying that these elements are relatively more compatible at reduced (ca. IW - 1.8) than at oxidized (FMQ and air) environments. Iron-rich and Mg-rich armalcolite show contrasting patterns of Dotal/melt, with the latter exhibiting slightly higher values of partition coefficient for all analyzed elements, except Th, which is equally incompatible in both end-members. Finally, the new dataset of D-HFSE(crystal/melt) was used to perform simple melting models of the lunar mantle cumulates. Results indicate that to reproduce the fractionation of W from the HFSE, as well as U and Th observed in lunar mare basalts, metal saturation and the presence of Fe-Ti oxides in the mantle sources is required. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Leitzke, Felipe P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fonseca, Raul O. C. UNSPECIFIED orcid.org/0000-0002-0897-4884 UNSPECIFIED Michely, Lina T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sprung, Peter UNSPECIFIED orcid.org/0000-0003-4862-1415 UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Heuser, Alexander UNSPECIFIED orcid.org/0000-0003-3772-5534 UNSPECIFIED Blanchard, Henrik UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-255733
DOI:	10.1016/j.chemgeo.2016.07.011
Journal or Publication Title:	Chem. Geol.
Volume:	440
Page Range:	S. 219 - 239
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1872-6836
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HF-W CHRONOMETRY; TRACE-ELEMENTS; CORE FORMATION; EARLY DIFFERENTIATION; OXIDATION-STATE; OXYGEN FUGACITY; FE; MOON; COEFFICIENTS; TI Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25573