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Accessory Mineral Eu Anomalies in Suprasolidus Rocks: Beyond Feldspar
dc.contributor.authorHolder, R. M.
dc.contributor.authorYakymchuk, C.
dc.contributor.authorViete, D. R.
dc.date.accessioned2020-09-02T15:01:32Z
dc.date.availableWITHHELD_12_MONTHS
dc.date.available2020-09-02T15:01:32Z
dc.date.issued2020-08
dc.identifier.citationHolder, R. M.; Yakymchuk, C.; Viete, D. R. (2020). "Accessory Mineral Eu Anomalies in Suprasolidus Rocks: Beyond Feldspar." Geochemistry, Geophysics, Geosystems 21(8): n/a-n/a.
dc.identifier.issn1525-2027
dc.identifier.issn1525-2027
dc.identifier.urihttps://hdl.handle.net/2027.42/156481
dc.description.abstractAccessory mineral Eu anomalies (Eu/Eu*) are routinely measured to infer changes in the amount of feldspar over time, allowing accessory mineral U‐Pb dates to be linked to the progressive crystallization of igneous and metamorphic rocks and, by extension, geodynamic processes. However, changes in Eu/Eu* can reflect any process that changes the relative availability of Eu2+ and Eu3+. We constructed partitioning budgets for Sm, Eu2+, Eu3+, and Gd in suprasolidus metasedimentary rocks to investigate processes that can influence accessory mineral Eu anomalies. We modeled three scenarios: (1) closed‐system, equilibrium crystallization; (2) fractionation of Eu by feldspar growth during melt crystallization; and (3) removal of Eu by melt extraction. In the closed‐system equilibrium model, accessory mineral Eu/Eu* changes as a function of fO2 and monazite stability; Eu/Eu* changes up to 0.3 over a pressure‐temperature range of 4–12 kbar and 700–950°C. Fractionation of Eu by feldspar growth is modeled to decrease accessory mineral Eu/Eu* by ~0.05–0.15 per 10 wt% feldspar crystallized. Melt extraction has a smaller effect; removal of 10% melt decreases accessory mineral Eu/Eu* in the residue by ≤0.05. Although these models demonstrate that fractionation of Eu by feldspar growth can be a dominant control on a rocks u budget, they also show that the common interpretation that Eu/Eu* only records feldspar growth and breakdown is an oversimplification that could lead to incorrect interpretation about the duration and rates of tectonic processes. Consideration of other processes that influence Eu anomalies will allow for a broader range of geological processes to be investigated by petrochronology.Plain Language SummaryMetamorphic rocks—rocks in which new minerals grew in response to increase in pressure and temperature related to deep burial or subduction—and igneous rocks—rocks that formed as magmas cool and crystallize—provide a direct record of how Earth’s continents have moved and changed through time. To read this record, geologists need to be able to measure the ages of metamorphism and magmatism: When did it happen? How long did it last? How does it relate to other rocks around the world? A common approach to addressing these questions is using U‐Pb dating of the minerals zircon, monazite, and apatite. The elements these minerals incorporate are indicative of how hot and how deep in the Earth they were when they grew. In this study we explore how geologists can use the concentrations of the element Europium (Eu) in these minerals to provide new insights into the geological meaning of U‐Pb dates, leading to more robust interpretations of Earth’s plate tectonic history.Key PointsEu anomalies in suprasolidus rocks record any process that changes the relative availability of Eu2+ and Eu3+, not just feldspar growthDisequilibrium is required for feldspar growth to strongly influence accessory mineral Eu anomaliesComparing accessory mineral Eu anomalies and Sr concentrations leads to more robust interpretation than evaluating Eu anomalies alone
dc.publisherMineralogical Society of America
dc.publisherWiley Periodicals, Inc.
dc.subject.otherpetrochronology
dc.subject.otherapatite
dc.subject.otherU‐Pb
dc.subject.otherzircon
dc.subject.othermonazite
dc.subject.otherEu anomaly
dc.titleAccessory Mineral Eu Anomalies in Suprasolidus Rocks: Beyond Feldspar
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/156481/1/ggge22268_am.pdfen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/156481/3/ggge22268.pdfen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/156481/2/ggge22268-sup-0001-2020GC009052-Text_SI-S01.pdfen_US
dc.identifier.doi10.1029/2020GC009052
dc.identifier.sourceGeochemistry, Geophysics, Geosystems
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