Geocheminar - fall-2020
Variations in zircon trace element trends across the Peninsular Ranges Batholith
Oct. 1, 2020
3:30 p.m. - 4:30 p.m.
Zoom
Presented By:
- Elizabeth Bell - UCLA
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Seminar Description coming soon.
Reexamination of asteroidal impact history based on U-Pb chronology of eucrite phosphates
Oct. 8, 2020
4 p.m. - 5 p.m.
Zoom
Presented By:
- Mizuho Koike - Hiroshima University
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Seminar Description coming soon.
Ground truth evidence shows decameter-scale pure anorthosite is rare in the lunar crust
Oct. 15, 2020
3:30 p.m. - 4:30 p.m.
Zoom
Presented By:
- Paul Warren - UCLA
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Seminar Description coming soon.
Demystifying the Mantle: Thermodynamic and Geochemical Heterogeneity within Mid-Ocean Ridge Peridotites
Oct. 22, 2020
3:30 p.m. - 4:30 p.m.
Zoom
Presented By:
- Suzanne Birner - Berea College
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Mid-ocean ridge peridotites provide a rare but fruitful glimpse into the Earth’s interior, recording significantly greater chemical variability than do their erupted basalt counterparts. This variability may derive from modern processes related to melting and melt-rock interaction or from long-lived source heterogeneity related to recycled material or ancient melting events. In this talk, I’ll discuss variations in the geochemistry and thermodynamics of a suite of peridotites from a densely-sampled segment of the Southwest Indian Ridge. These variations can be tied primarily to modern melting and melt-rock reaction processes. However, neither of these processes appears to generate the observed variability in recorded oxygen fugacity, which may indicate that oxygen fugacity variations record evidence of long-lived source heterogeneity in the mantle.
TBD: 238U/235U fractionation
Nov. 5, 2020
3:30 p.m. - 4:30 p.m.
Zoom
Presented By:
- Stephen Romaniello - U. Tennessee, Knoxville
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Seminar Description coming soon.
Li-B isotopic compositions in chondrules: implications for the origin of the solar boron isotopes
Nov. 12, 2020
3:30 p.m. - 4:30 p.m.
Zoom
Presented By:
- Ming-Chang Liu - UCLA
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Seminar Description coming soon.
Sulfur diagenesis and pyrite formation in Baltic Sea sediments
Nov. 19, 2020
3:30 p.m. - 4:30 p.m.
Zoom
Presented By:
- Jiarui Liu - UCLA
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Seminar Description coming soon.
TBD: Chondrule formation
Dec. 3, 2020
4 p.m. - 5 p.m.
Zoom
Presented By:
- TBD -
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