Oct. 1, 2020

3:30 p.m. - 4:30 p.m.
Zoom

Presented By: Elizabeth Bell,
UCLA

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Variations in zircon trace element trends across the Peninsular Ranges Batholith

Seminar Description coming soon.

Oct. 8, 2020

4 p.m. - 5 p.m.
Zoom

Presented By: Mizuho Koike,
Hiroshima University

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Reexamination of asteroidal impact history based on U-Pb chronology of eucrite phosphates

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Oct. 15, 2020

3:30 p.m. - 4:30 p.m.
Zoom

Presented By: Paul Warren,
UCLA

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Ground truth evidence shows decameter-scale pure anorthosite is rare in the lunar crust

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Oct. 22, 2020

3:30 p.m. - 4:30 p.m.
Zoom

Presented By: Suzanne Birner,
Berea College

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Demystifying the Mantle: Thermodynamic and Geochemical Heterogeneity within Mid-Ocean Ridge Peridotites

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.

Nov. 5, 2020

3:30 p.m. - 4:30 p.m.
Zoom

Presented By: Stephen Romaniello,
U. Tennessee, Knoxville

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TBD: 238U/235U fractionation

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Nov. 12, 2020

3:30 p.m. - 4:30 p.m.
Zoom

Presented By: Ming-Chang Liu,
UCLA

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Li-B isotopic compositions in chondrules: implications for the origin of the solar boron isotopes

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Nov. 19, 2020

3:30 p.m. - 4:30 p.m.
Zoom

Presented By: Jiarui Liu,
UCLA

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Sulfur diagenesis and pyrite formation in Baltic Sea sediments

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Dec. 3, 2020

4 p.m. - 5 p.m.
Zoom

Presented By: Eugene Chiang,
UC Berkeley

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TBD: Chondrule formation

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