Garnetite enclave in garnet clinpyroxenite mantle xenolith
Oʻahu, Hawaiʻi
#pyroxenite #geology #xenolith #hawaii #volcanology #garnet #garnetite #geoscience
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Garnetite enclave in garnet clinopyroxenite mantle xenolith
Oʻahu, Hawaiʻi
#pyroxenite #geology #xenolith #hawaii #volcanology #garnet #garnetite #geoscience
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Garnetite enclave in garnet pyroxenite mantle xenolith
Oʻahu, Hawaiʻi
#pyroxenite #geology #xenolith #hawaii #volcanology #garnet #garnetite #geoscience
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In things that make me happy, a bit of the collection...Lawsonite blueschist, eclogitic blueschist, glaucophanite, various eclogites, orthopyroxenite, clinopyroxenite, garnet websterite
#eclogite #pyroxenite #blueschist #clinopyroxenite #websterite #garnet #metamorphic #geology #geoscience
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Makapuʻu-Stage #Koʻolau Basalt has the most radiogenic Sr87/86 of #Hawaiʻi #lavas, low εNd, Hf176/177, and Pb206/204, and high La/Nb and Sr/Nb indicating a filament of recycled material (secondary garnet #pyroxenite via #eclogite) of the Hawaiian ULVZ associated with the Pacific LLSVP.
#geology
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Olivine websterite (?) xenolith
A recent study suggests a mantle origin for olivines in cumulate ultramafic xenoliths of Hualālai's Kaʻūpūlehu Flow Field.
#geoscience #geology #hualālai #volcanology #volcano #xenolith #xenolith #websterite #pyroxenite
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Peridotite and clinopyroxenite mantle xenoliths
Moanalua vent, Honolulu Volcanics, Koʻolau, Oʻahu, Hawaiʻi
#geoscience #geology #dunite #volcanology #volcano #mantle #xenolith #xenocryst #peridotite #Hawaii #pyroxenite
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Chromian pyrope garnets eroded from garnet pyroxenite (sensu lato) and/or garnet peridotite mantle xenoliths brought up by minette lamprophyres.
Navajo Volcanic Field, Arizona
#geology #geoscience #lamprophyre #garnet #pyrope #pyroxenite #eclogite #peridotite
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Strange #clinopyroxenite mantle #xenolith hosted by rejuvenation-stage #Kauaʻi Kōloa Volcanics nephelinite(?). Unlike Oʻahu Honolulu Volcanics lavas for which carbonatite metasomatism in their petrogenesis is debatable, evidence is more robust for Kōloa.
#pyroxenite #volcano #geology #geoscience
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Clinopyroxenite and dunite xenoliths
Kolekole Member of the Waiʻanae Volcanics
Waiʻanae, Oʻahu
#xenolith #clinopyroxenite #pyroxenite #volcano #geology #geoscience #dunite #peridotite
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Clinopyroxenite xenolith
Kolekole Member of the Waiʻanae Volcanics
Waiʻanae, Oʻahu
#xenolith #clinopyroxenite #pyroxenite #volcano #geology #geoscience
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Sharing about a clinopyroxenite xenolith hosted by Kolekole Member of the Waiʻanae Volcanics basalt at the Hui Pōhaku. An unusual case of ultramafic xenoliths hosted by a tholeiite.
#pyroxenite #Hawaiʻi #waiʻanae #gelology #xenolith #geoscience
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Rare composite #peridotite - #pyroxenite xenolith may have formed via opx assimilation and most likely not one-time suggested kimberlitic veining underneath Oʻahu...which shouldn't even be possible with oceanic lithosphere. Āliamanu, Honolulu Volcanics, Oʻahu.
#geoscience #geology #xenolith
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Garnet Pyroxenite Mantle Xenoliths hosted in melilite nephelinite tuff
Āliamanu-Moanalua vents, Honolulu Volcanics, Koʻolau, Oʻahu, Hawaiʻi
#geoscience #geology #volcanology #volcano #xenolith #garnet #pyroxenite #mantle #garnetpyroxenite #tuff #HonoluluVolcanics #Hawaiʻi
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Pyroxenite xenoliths of #mantle origin were erupted from only 3 Hawaiʻi rejuvenation vents, composite #peridotite - #pyroxenite xenoliths are rarer and may reflect opx dissolution. Revisiting this Oʻahu sample from January, no visible garnet in handsample but cool nonetheless.
#geology #geoscience
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#Pyroxenite composed of #chrome #diopside of the Jurassic-aged Great Valley #Ophiolite, Diablo Range, #California. #Lavas and #dikes there are mainly #calc-alkaline of island arc/forarc origin. Some samples more geochemically #MORB -like suggesting incipient rifting.
#geoscience #geology
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#Zeolites are common in Honolulu Volcanics #tuff and #lavas, always as a secondary mineral. #Garnet #pyroxenite xenoliths only occur in three places in Hawaiʻi, all of them rejuvenation vents.
#xenolith #ultramafic #geology #geoscience
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Currently back in Hawaiʻi among #Honolulu #Volcanics #ultramafic #mantle xenoliths.
1. #Garnet #clinopyroxenite
2. #Spinel #lherzolite
3. Garnet clinopyroxenite hosted in #melilite #nephelinite #tuff
4. Hybrid(?) #Pyroxenite - #peridotite #xenolith
#geoscience #geology #volcanology #volcano
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#Garnet- bearing #Clinopyroxenite mantle xenolith
Honolulu Volcanics, Oʻahu, Hawaiʻi
#pyroxenite #xenolith #geology #volcanology
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#Makapuʻu lends its name to the Makapuʻu-Stage lavas of the #Koʻolau Basalt. They have the highest 87Sr/86Sr of #Hawaiʻi #lavas, low 143Nd/144Nd, 176Hf/177Hf, and 206Pb/204Pb, and high La/Nb and Sr/Nb indicating a recycled component (likely secondary #pyroxenite via #eclogite) of the Pacific LLSVP.
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Garnet Pyroxenite mantle xenolith
Oʻahu, Hawaiʻi
Once thought to originate from the deepest known magmatic fractional crystallization processes in an oceanic region, two-pyroxene geothermometry supports a mid-lithospheric origin.
#pyroxenite #geology #xenolith #hawaii #volcanology
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