Potassic volcanism near Mono Basin, California; evidence for high water and oxygen fugacities inherited from subduction

Exposed around the margins of Mono basin and the periphery of Long Valley caldera are ∼100 km3 of potassic, basic to intermediate lavas that record high water and oxygen fugacities. Most eruptions occurred between 4 and 2 Ma, although sporadic potassic volcanism continued into the Quaternary with a...

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Published in:Geology (Boulder) 1993-10, Vol.21 (10), p.949-952
Main Authors: Lange, Rebecca A, Carmichael, Ian S. E, Renne, Paul R
Format: Article
Language:English
Subjects:
absolute age
California
Cenozoic
crystallization
dates
east-central California
fugacity
geochemistry
Geology
Geophysics
hydration
igneous and metamorphic rocks
K/Ar
lava
Long Valley Caldera
magmas
mantle
Mono Basin
Mono County California
Neogene
Oxidation
oxygen
Petrology
plate tectonics
Pliocene
potassic composition
Quaternary
rock, sediment, soil
solid Earth (tectonophysics)
subduction
Tertiary
United States
upper mantle
volcanism
Volcanoes
Water
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creator Lange, Rebecca A
Carmichael, Ian S. E
Renne, Paul R
description Exposed around the margins of Mono basin and the periphery of Long Valley caldera are ∼100 km3 of potassic, basic to intermediate lavas that record high water and oxygen fugacities. Most eruptions occurred between 4 and 2 Ma, although sporadic potassic volcanism continued into the Quaternary with a pulse between 0.1 and 0.5 Ma, ∼15 km northeast of Mono basin. The lava types include absarokite, minette, hornblende lamprophyre, trachybasalt, and trachyandesite. Estimated water contents for lavas without hydrous phenocrysts range between 2 and 3 wt%, considerably more than mid-ocean ridge, oceanic island, or back-arc magmas. Calculated f O2 values fall between -0.4 and +1.2 log units of the Ni-NiO buffer. Although this potassic suite was erupted in an extensional tectonic setting at the western margin of the Basin and Range province, its high K2O/TiO2 and low Zr/Ba ratios suggest a subduction-modified mantle source. If subduction was the process that enriched the lithospheric mantle in large-ion lithophile elements (K, Ba, etc.), it was also a mechanism for mantle oxidation and hydration. October 1993
doi_str_mv 10.1130/0091-7613(1993)021<0949:PVNMBC>2.3.CO;2
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source 地球科学世界出版社期刊（NSTL购买）
subjects absolute age
California
Cenozoic
crystallization
dates
east-central California
fugacity
geochemistry
Geology
Geophysics
hydration
igneous and metamorphic rocks
K/Ar
lava
Long Valley Caldera
magmas
mantle
Mono Basin
Mono County California
Neogene
Oxidation
oxygen
Petrology
plate tectonics
Pliocene
potassic composition
Quaternary
rock, sediment, soil
solid Earth (tectonophysics)
subduction
Tertiary
United States
upper mantle
volcanism
Volcanoes
Water
title Potassic volcanism near Mono Basin, California; evidence for high water and oxygen fugacities inherited from subduction
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