Abstract
The usefulness of the Mn/Fe ratios of olivine and pyroxene to identify a sample's host parent body is well established. Although there is an overarching, defining slope for each planetary body, there is some scatter, or "dispersion" around the defining slope. This dispersion reveals important facts relating to the planetary body. The source regions of the three main types of lunar basalts (very high-Ti, low-Ti, and very low-Ti) have fO2 values near IW-1 or below, and all iron is either ferrous or metallic. The dispersion in the Mn/Fe ratios of pyroxene from the Moon is largely caused by differences in the Ti and Al concentrations in the mantle source regions and the resulting differences in Ti activity of the primary basaltic melts derived from those sources. Ti displaces ferrous iron in the pyroxene Ml site (in a coupled substitution with Al for Si in the tetrahedral site), and therefore, with increasing Ti activity the Mn/Fe ratio in pyroxene increases in all three suites studied. For lunar mare basalts, the effect of Ti activity on the occupancy of the pyroxene Ml site, and crystallization sequence differences among high-Ti, low-Ti, and VLT basalts account for almost all of the observed dispersion in the Mn/Fe ratios.
Acknowledgments and Funding
Comments from B. Jolliff and an anonymous reviewer led to improvements in the text, and the efforts of AE C. Lesher are appreciated. This work was partially supported by NASA grant NNX17AH90G (S. Simon, PI).
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© 2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Editorial
- Why scientists should study chess
- Highlights and Breakthroughs
- Neither antigorite nor its dehydration is “metastable”
- Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications
- Roebling Medal Paper
- An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering
- The composition and mineralogy of rocky exoplanets: A survey of >4000 stars from the Hypatia Catalog
- New insights into the zircon-reidite phase transition
- The effects of contrasting Ti and Al activities on Mn/Fe systematics in pyroxene from lunar mare basalts
- The condensation temperatures of the elements: A reappraisal
- Estimation of radiation damage in titanites using Raman spectroscopy
- The effect of incorporated carbonate and sodium on the IR spectra of A- and AB-type carbonated apatites
- Re-configuration and interaction of hydrogen sites in olivine at high temperature and high pressure
- The ascent of water-rich magma and decompression heating: A thermodynamic analysis
- High-pressure phase transitions of clinoenstatite
- Compressibility of two Na-rich clinopyroxenes: A synchrotron single-crystal X-ray diffraction study
- Book Review
Artikel in diesem Heft
- Editorial
- Why scientists should study chess
- Highlights and Breakthroughs
- Neither antigorite nor its dehydration is “metastable”
- Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications
- Roebling Medal Paper
- An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering
- The composition and mineralogy of rocky exoplanets: A survey of >4000 stars from the Hypatia Catalog
- New insights into the zircon-reidite phase transition
- The effects of contrasting Ti and Al activities on Mn/Fe systematics in pyroxene from lunar mare basalts
- The condensation temperatures of the elements: A reappraisal
- Estimation of radiation damage in titanites using Raman spectroscopy
- The effect of incorporated carbonate and sodium on the IR spectra of A- and AB-type carbonated apatites
- Re-configuration and interaction of hydrogen sites in olivine at high temperature and high pressure
- The ascent of water-rich magma and decompression heating: A thermodynamic analysis
- High-pressure phase transitions of clinoenstatite
- Compressibility of two Na-rich clinopyroxenes: A synchrotron single-crystal X-ray diffraction study
- Book Review