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Zircon Xenocrysts From Easter Island (Rapa Nui) Reveal Hotspot Activity Since the Middle Jurassic
AGU AdvancesWe report the finding of mantle‐derived zircon grains retrieved from red soils, regoliths, and beach sands from Easter Island, that are much older than the island volcanism (0–2.5 Ma) and its underlying lithosphere (Pliocene, 3–4.8 Ma).
Yamirka Rojas‐Agramonte +9 more
doaj +1 more source
Geosystems and GeoenvironmentMinerals separated from heavy mineral concentrates from two phases of the Aykhal kimberlite pipe, Yakutia, were analyzed with the EPMA, SEM, and ICP-MS.
I.V. Ashchepkov +4 more
doaj +1 more source
Thermoluminescence age of quartz xenocrysts in basaltic lava from Oninomi monogenetic volcano, northern Kyushu, Japan [PDF]
, 2013 We determined the eruption age of basaltic rocks by application of thermoluminescence (TL) method, which is often used for TL dating, to quartz. Mafic magma only rarely includes quartz because of their mutual disequilibration. The basaltic lavas reported
Takemura, Keiji +11 more
core +1 more source
, 2014 The first U-Pb ages from a ca. 26–24 Ma pluton on Guadalcanal, in the intra-oceanic Solomon island arc (southwest Pacific Ocean), reveal Eocene- to Archean-aged zircon xenocrysts. Xenocryst populations at ca. 39–33 Ma and ca.
S. Tapster +4 more
semanticscholar +1 more source
Diffusion Coronas Around Quartz Xenocrysts in Basaltic Andesite from Capus (Cionca Hill, Gilau Mountains - Romania) [PDF]
, 2012 Diffusion coronas consisting of Al – poor pyroxene (augite), glass and silica polymorphs are developed around the quartz xenocrysts in the olivine basaltic andesite from Cionca Hill (Gilău Mountains).
Rusu, Ana-Maria, Har, Nicolae
core +1 more source
Olivine xenocrysts reveal carbonated mid-lithosphere in the northern Slave craton
Lithos, 2022 C. Veglio +5 more
semanticscholar +1 more source
In this short communication, we report and discuss for the first time the occurrence of pargasite-bearing pyroxenite mantle macro-xenocrysts in a basaltic-andesite juvenile material erupted from the Holocene Ocotenco maar at the Serd ́an-Oriental Basin
Daniela Ruospo +7 more
core +1 more source
Brazilian Journal of Geology: The Monte de Trigo alkaline suite is a SiO2-undersaturated syenite-gabbroid association from the Serra do Mar alkaline province. Eudialyte-group minerals (EGMs) occur in one nepheline microsyenite dyke, associated with aegirine-augite, wöhlerite ...
Gaston Eduardo Enrich Rojas +3 more
doaj +1 more source
Cooling rates of olivine xenocrysts in the EET79001 shergottite
Cooling rates of olivine xenocrysts in the EET79001 shergottiteP(論文) The chemical zoning profiles of olivine xenocrysts in lithology A of the Elephant Moraine (EET) 79001 basaltic shergottite have been measured in order to investigate its cooling history. Olivines are zoned from Fa_ in the cores to Fa_ in the rims.
openaire +2 more sources