Joshua Shea
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Notes

Plain-language explainers of papers, methods, and bits of geochemistry I think are interesting.

A working notebook of paper explainers, method walk-throughs, and the occasional opinion. The pieces here are written for whoever finds them useful — undergraduates, collaborators in adjacent fields, the public, and (often) future me.

If something here helps clarify a paper or a method, drop me a line.

Why the upper mantle’s carbon isotopes needed a rewrite

carbon
MORB
SIMS
paper-explainer
A plain-language explainer of our 2026 Geochemical Perspectives Letters paper revising the carbon isotope composition of the convecting upper mantle — what we measured, why it differs from textbook values, and what it means for the long-term carbon cycle.
Jan 15, 2026
3 min
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