Edward W. Marshall
@edmarshall.bsky.social
🌋 Geochemistry Postdoc at FAU Erlangen-Nürnberg in 🇩🇪. Studies Icelandic volcanism, magmas, and the mysteries of Earth's mantle.
Oh I see! Yeah you are right-- it does make it seem like those types don't exist. I actually remember being confused about this when I was a student.
August 29, 2025 at 4:06 PM
Oh I see! Yeah you are right-- it does make it seem like those types don't exist. I actually remember being confused about this when I was a student.
It is? I thought it was called tachylite. I thought true obsidian was always silicic. In my head the Venn diagram would have a big circle for volcanic glass with tachylite and obsidian as non-overlapping circles within the volcanic glass circle.
August 29, 2025 at 3:58 PM
It is? I thought it was called tachylite. I thought true obsidian was always silicic. In my head the Venn diagram would have a big circle for volcanic glass with tachylite and obsidian as non-overlapping circles within the volcanic glass circle.
I guess they are writing to integrate the text better with rocks that students likely have in their classroom or might be familiar with prior to the class. They are putting in the ladder at the shallow end of the pool.
August 29, 2025 at 3:34 PM
I guess they are writing to integrate the text better with rocks that students likely have in their classroom or might be familiar with prior to the class. They are putting in the ladder at the shallow end of the pool.
I should say-- the one cartoon figure, not figures. Anyway, definitely not as depicted-- the core-mantle boundary being stretched to the surface.
August 13, 2025 at 11:34 AM
I should say-- the one cartoon figure, not figures. Anyway, definitely not as depicted-- the core-mantle boundary being stretched to the surface.
The title of the artcle and the figures of the article are misleading. The core isn't leaking out at the surface. Tiny fractions of core material are entrained into the mantle, and this core-contaminated mantle material eventually is melted beneath some hot spots.
August 13, 2025 at 11:29 AM
The title of the artcle and the figures of the article are misleading. The core isn't leaking out at the surface. Tiny fractions of core material are entrained into the mantle, and this core-contaminated mantle material eventually is melted beneath some hot spots.
They are really cool!
July 31, 2025 at 11:18 AM
They are really cool!
What are these? Are they glomercrysts weathering out of a lava?
July 31, 2025 at 11:18 AM
What are these? Are they glomercrysts weathering out of a lava?
@vaccinium-sultan.bsky.social is always posting awesome xenoliths. They aren't folds or thin sections, but they are rocks!
July 25, 2025 at 10:46 AM
@vaccinium-sultan.bsky.social is always posting awesome xenoliths. They aren't folds or thin sections, but they are rocks!
Whoa this is really cool!
July 24, 2025 at 4:14 AM
Whoa this is really cool!
Hmm tricky! I tried to think of relatively recent and/or short papers.
May 31, 2025 at 8:27 PM
Hmm tricky! I tried to think of relatively recent and/or short papers.
I'm not really sure what you're looking for, or even if such a paper exists, but here are some contenders that popped into my head.
www.nature.com/articles/nge...
www.nature.com/articles/nge...
www.nature.com/articles/s41...
www.nature.com/articles/nge...
www.nature.com/articles/nge...
www.nature.com/articles/s41...
Magmatic filtering of mantle compositions at mid-ocean-ridge volcanoes - Nature Geoscience
The Earth's mantle constitutes over 80% of the planet's volume and is a key reservoir in global geochemical cycling. An overview of the progress in understanding the generation of mid-ocean-ridge basa...
www.nature.com
May 31, 2025 at 5:38 PM
I'm not really sure what you're looking for, or even if such a paper exists, but here are some contenders that popped into my head.
www.nature.com/articles/nge...
www.nature.com/articles/nge...
www.nature.com/articles/s41...
www.nature.com/articles/nge...
www.nature.com/articles/nge...
www.nature.com/articles/s41...
Thanks! It was by far the most exciting science I've ever done! It's true that the earliest lavas are buried- maybe we should be drilling and collecting core from more lava shields! The cores from the HSDP borehole were super cool and revealing, for example.
May 27, 2025 at 12:18 PM
Thanks! It was by far the most exciting science I've ever done! It's true that the earliest lavas are buried- maybe we should be drilling and collecting core from more lava shields! The cores from the HSDP borehole were super cool and revealing, for example.
Cpx-melt and melt inclusion volatile saturation pressures say they come from the lower crust or near Moho! Probably syn-eruptive decompacted crystal mushes! agupubs.onlinelibrary.wiley.com/doi/full/10....
The Petrology and Geochemistry of the 2021 Fagradalsfjall Eruption, Iceland: An Eruption Sourced From Multiple, Compositionally Diverse, Near‐Moho Sills
We use high frequency sampling to observe rapid changes in lava composition during the 183 day 2021 Fagradalsfjall eruption
The eruption was sourced from 12 to 15 km depth, corresponding to the l...
agupubs.onlinelibrary.wiley.com
May 27, 2025 at 7:52 AM
Cpx-melt and melt inclusion volatile saturation pressures say they come from the lower crust or near Moho! Probably syn-eruptive decompacted crystal mushes! agupubs.onlinelibrary.wiley.com/doi/full/10....