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#petrology

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bse

9-month Geo position at Skidmore: earth materials, geophysical methods, intro. "Expertise in any of the following areas is desirable: #petrology, #mineralogy, #geophysics, tectonics, Earth history, and related fields." ⚒️🧪 #geology

eodq.fa.us6.oraclecloud.com/hc

Skidmore CareersVisiting Assistant Professor, GeosciencesThe Department of Geosciences at Skidmore College invites applications for a full-time, 9-month appointment as Visiting Assistant Professor to begin fall 2025. We seek a broadly trained geologist with strong teaching capabilities in solid Earth processes and Deep Time to offer both introductory and advanced classes. During the 2025-2026 academic year, the successful candidate will be expected to teach an intermediate-level laboratory course in Earth Materials, an intermediate-level course in geophysical methods, and two sections of an introductory course with lab. Expertise in any of the following areas is desirable: petrology, mineralogy, geophysics, tectonics, Earth history, and related fields. Women and minority candidates are encouraged to apply. A Ph.D. in an appropriate Earth science discipline or closely related field is required by the time of appointment, and prior teaching experience is desirable. Candidates should submit a letter of interest, CV, Statement of Teaching (i...
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Ele Willoughby, PhD

to the doctoral program. She was unhelpfully limited in her library & classroom access to shield her from the “rougher influences” of the young men; in her isolation she decided to focus on #petrology. Her thesis “A Contribution to the Geology of South Mountain, Pennsylvania” is regarded as a major contribution to Appalachian geology & she published it in the 1st volume of the Journal of Geology in 1893. She furthered understanding of the east coast of the US & redefined the recognized 🧵3/n

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Bill Minarik

Sorena Sorensen passed away this month.

Sorena was a long-time curator at the National Museum of Natural History of the Smithsonian Institution. She was also an insightful and talented researcher who studied the role of fluids in metamorphism of subduction-related rocks. She also contributed to understanding the formation of jadeite and jade deposits.

News from Elizabeth Cottrell, also at #NMNH

#Geology#Petrology#Subduction
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Diego González

🌋🧵Our latest publication is just out in Scientific Reports! We studied some peculiar petrologic features of the 2021 #CumbreVieja #eruption #LaPalma #Tajogaite. Compositionally distinct filaments are found in glass (melt) from tephra sampled in the fifth day (23 September), suggesting #MagmaMixing! @avhstiftung
#CanaryIslands #petrology #volcanology #geochemistry

nature.com/articles/s41598-023

NatureBubble-enhanced basanite–tephrite mixing in the early stages of the Cumbre Vieja 2021 eruption, La Palma, Canary Islands - Scientific ReportsSyneruptive magma mixing is widespread in volcanic eruptions, affecting explosivity and composition of products, but its evidence in basaltic systems is usually cryptic. Here we report direct evidence of mixing between basanitic and tephritic magmas in the first days of the 2021 Tajogaite eruption of Cumbre Vieja, La Palma. Groundmass glass in tephritic tephra from the fifth day of the eruption is locally inhomogeneous, showing micron-scale filamentary structures of Si-poor and Fe-, Mg-rich melt, forming complex filaments attached to bubbles. Their compositional distribution attests the presence of primitive basanitic magma, with compositions similar to late-erupted melts, interacting with an evolved tephritic melt during the first week of the event. From filament morphology, we suggest their generation by dragging and folding of basanitic melt during bubble migration through melt interfaces. Semi-quantitative diffusion modelling indicates that the filamentary structures are short-lived, dissipating in timescales of tens of seconds. In combination with thermobarometric constraints, we suggest a mixing onset by sub-Moho remobilization of a tephritic reservoir by basanite input, followed by turbulent ascent of a mingled magma. In the shallow conduit or lava fountain, bubble nucleation and migration triggered further mingling of the distinct melt-phases. This phenomenon might have enhanced the explosive behaviour of the eruption in such period, where violent strombolian explosions were common.
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attresa.geo

Yesterday, we had a tour of Vilnius with the #petrology lecturer. It's interesting that pavements are often made of poorly chosen rocks, because it's cheaper that way, but the coating crumbles after 1-2 years and needs to be replaced again. Here is a fairly new #granite pavement, which is already broken because the slabs are large and too thin. Could not withstand the load. In order for them to hold the load, they should be at least 8-10 cm thick.

#tourofpetrology#geology#adventuretime
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AnthropoceneMan

Rock forming wars. Dueling melts and new incursions break early fortifications.

Solid solution shifts and crystallization/re-melting modify chemistry as new blood is added.

Crystals jockeying and wrestling for components as the chemistry, temperature and pressures vacillate across eutectics.

When magmas collide, it beggars comprehension…but to tease out the truths told is to look into the very face of Nature.

Closeup view of a counter made of Rapakivi Granite, showing large, rimmed or orbicular masses of granite surrounded by a mafic groundmass.
#Geology#Nature#Petrology
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AnthropoceneMan

Petrology Assistance Needed

What am I looking at here? It has been 40 years since Ig/Pet and I am rusty as hell.

Looks like settling of “clots” of early crystallizing kspar/hornblende that settled into the bottom of the magma chamber where they were both rounded and “attacked” by the magma at the bottom due to incompatibility. The cores became nuclei for deposition of plagioclase and the crystallization of enriched residual mafics (pyroxene?).

Help a rusty Geo out?

#Geology #Petrology #Crystal #MagmaticDifferentiation
#UrbanGeology

Closeup of granite “pheocrysts” or spheroidal clots of crystallized granite in a mystery matrix.
Closeup of “granite clots” showing reaction rims and Pyroxene(?) matrix?
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