#omphacite — Public Fediverse posts

Callan Bentley has written a blog post on the Jenner blueschists and eclogites at: https://mountainbeltway.all-geo.org/2019/12/13/friday-fold-blueschist-eclogite-at-jenner-california/
He also collaborated on AGU's Streetcar2Subduction:
https://www.agu.org/learn-and-develop/learn/streetcar2subduction/streetcar2subduction

Check out the Eclogite Block at the Ring Mountain Stop for omphacitic pyroxene goodness.

#MinCup24 #Omphacite #AGU #Streetcar2Subduction #California #BayArea #Geology

A Gigapan image of #omphacite from Jenner, California.

The glorious green omphacite is surrounded by assorted other minerals.

https://www.gigapan.com/galleries/7874/gigapans/17328
Ron Schott

#MinCup24 #Geology #Eclogite #Subduction

<*grabby hands*> ooooo I want some of this. Look at that. The #garnet and #omphacite in matrix look AWESOME. #MinCup24

via @dlw

https://mastodon.social/@dlw/113115464176037236

#Mellite & #Omphacite get their names from the Greek for honey & unripe grapes, respectively. Both are found in jewelry for my art vote #MinCup24

Omphacite is appealing to the marine geophysicist/tectonophysicist in me with its high pressure subducted oceanic crust story & wins my physics vote.

#scicomm #minerals #earthSci

#Mellite & #Omphacite get their names from the Greek for honey & unripe grapes, respectively. Both are found in jewelry for my art vote #MinCup24

Omphacite is appealing to the marine geophysicist/tectonophysicist in me with its high pressure subducted oceanic crust story & wins my physics vote.

#scicomm #minerals #earthSci

#Mellite & #Omphacite get their names from the Greek for honey & unripe grapes, respectively. Both are found in jewelry for my art vote #MinCup24

Omphacite is appealing to the marine geophysicist/tectonophysicist in me with its high pressure subducted oceanic crust story & wins my physics vote.

#scicomm #minerals #earthSci

#Mellite & #Omphacite get their names from the Greek for honey & unripe grapes, respectively. Both are found in jewelry for my art vote #MinCup24

Omphacite is appealing to the marine geophysicist/tectonophysicist in me with its high pressure subducted oceanic crust story & wins my physics vote.

#scicomm #minerals #earthSci

#Mellite & #Omphacite get their names from the Greek for honey & unripe grapes, respectively. Both are found in jewelry for my art vote #MinCup24

Omphacite is appealing to the marine geophysicist/tectonophysicist in me with its high pressure subducted oceanic crust story & wins my physics vote.

#scicomm #minerals #earthSci

Eclogite: the Christmas Rock

Eclogite is an absolutely fascinating and beautiful rock that has earned the nickname “Christmas rock” due to its colorful mineral garnet (red) and omphacite (green). What’s so fascinating about eclogite is the way it forms

Eclogite is a high pressure and temperature metamorphic rock formed from protolithic basalt or grabbro (oceanic crust) that has been dragged down a subduction zone to (or nearly to) the upper mantle. It is brought up by a process now known as “eduction.” More here: https://c.im/@vickyveritas/109668814063843473

The process of bringing eclogite back up from a subduction zone was first proposed by W. G. Ernst in 1965, and was an immediate controversy. Ernst’s early ideas have been accepted, expanded upon, tested, and extended. As an undergrad in the 90s, I had the great pleasure to have gone on a geology field trip, led by Gary Ernst, to Pacheco Pass, California, where eclogite is found in the Franciscan Complex. He is a lovely guy, very approachable, enthusiastic and willing to share.

Here is Ernst’s famous paper/abstract: https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/76/8/879/5938/Mineral-Parageneses-in-Franciscan-Metamorphic?redirectedFrom=fulltext

Here is Evelyn Mervine’s great AGU blog on eclogites: https://blogs.agu.org/georneys/2011/07/02/geology-word-of-the-week-e-is-for-eclogite/

#eclogite #gabbro #basalt #garnet #omphacite #ChristmasRock #geology #ScienceMastodon @geology