A five-collector system for the simultaneous measurement of argon isotope ratios in a static mass spectrometer

Stacey, J. S.; Sherrill, N.D.; Dalrymple, G. Brent; Lanphere, Marvin A.; Carpenter, Nitin

doi:10.1016/0020-7381(81)80031-9

Cited by 39 publications

(8 citation statements)

References 8 publications

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“…From these measuremer Ar age of 519.5±2.5 Ma was calculated (Alexander an 1978). The Ar measurements were made on a newly de multiple-collector mass spectrometer (Stacey and 1981). Only about 20 percent of a typical gas sam introduced into the mass spectrometer.…”

Section: Discussionmentioning

confidence: 99%

First-principles calibration of 38Ar tracers :implications for the ages of 40Ar/39Ar fluence monitors

Lanphere¹,

Dalrymple²

2000

Professional Paper

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Section: Discussionmentioning

confidence: 99%

First-principles calibration of 38Ar tracers :implications for the ages of 40Ar/39Ar fluence monitors

Lanphere¹,

Dalrymple²

2000

Professional Paper

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“…Argon extractions and isotopic analyses for K-At dating were performed at the U.S. Geological Survey laboratories in Menlo Park, California. Argon analyses were by standard isotope dilution methods using a 60 ø sector, 15.2-cm Neir-type gas-source mass spectrometer operated in the static mode for mass analysis or using a five-collector system for simultaneous measurement of argon isotopes [Stacey et al, 1981], according to procedures described by Dalrymple and Lanphere [1969]. Potassium analyses were by a lithium metaborate flux fusionflame photometry technique using lithium as an internal standard following procedures described by Ingamells [1970].…”

Section: Discussionmentioning

confidence: 99%

Style and age of late Oligocene‐early Miocene deformation in the southern Stillwater Range, west central Nevada: Paleomagnetism, geochronology, and field relations

Hudson¹,

John²,

Conrad³

et al. 2000

J. Geophys. Res.

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“…At least two argon extractions and four potassium analyses were completed for each sample using techniques similar to those of Dalrymple and Lanphere (1969) and Ingamells (1970). Argon isotope ratios were measured using a multi-collector mass spectrometer (Stacey et al 1981). The potassium-argon work was done at the U. S. Geological Survey in Menlo Park, California.…”

Section: Analytical Techniquesmentioning

confidence: 99%

Postshield volcanism and catastrophic mass wasting of the Waianae Volcano, Oahu, Hawaii

Presley

Sinton

Pringle

1997

Bulletin of Volcanology

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The 3.9-to 2.9-Ma Waianae Volcano is the older of two volcanoes making up the island of Oahu, Hawaii. Exposed on the volcanic edifice are tholeiitic shield lavas overlain by transitional and alkalic postshield lavas. The postshield "alkalic cap" consists of aphyric hawaiite of the Palehua Member of the Waianae Volcanics, overlain unconformably by a small volume of alkalic basalt of the Kolekole Volcanics. Kolekole Volcanics mantle erosional topography, including the uppermost slopes of the great Lualualei Valley on the lee side of the Waianae Range. Twenty new K-Ar dates, combined with magnetic polarity data and geologic relationships, constrain the ages of lavas of the Palehua member to 3.06-2.98 Ma and lavas of the Kolekole Volcanics to 2.97-2.90 Ma. The geochemical data and the nearly contemporaneous ages suggest that the Kolekole Volcanics do not represent a completely independent or separate volcanic event from earlier postshield activity; thus, the Kolekole Volcanics are reduced in rank, becoming the Kolekole Member of the Waianae Volcanics. Magmas of the Palehua and Kolekole Members have similar incompatible element ratios, and both suites show evidence for early crystallization of clinopyroxene consistent with evolution at high pressures below the edifice. However, lavas of the Kolekole Member are less fractionated and appear to have evolved at greater depths than the earlier Palehua hawaiites. Postshield primary magma compositions of the Palehua and Kolekole Members are consistent with formation by partial melting of mantle material of less than 5-10% relative to Waianae shield lavas. Within the section of Palehua Member lavas, an increase with respect to time of highly incompatible to moderately incompatible element ratios is consistent with a further decrease in partial melting by approximately 1-2%. This trend is reversed with the onset of eruption of Kolekole Member lavas, where an increase in extent of partial melting is indicated. The relatively short time interval between the eruption of Palehua and Kolekole Member lavas appears to date the initial formation of Lualualei Valley, which was accompanied by a marked change in magmatic conditions. We speculate that the mass-wasting event separating lavas of the Palehua and Kolekole Members may be related to the formation of a large submarine landslide west and southwest of Waianae Volcano. Enhanced decompression melting associated with removal of the equivalent volume of this landslide deposit from the edifice is more than sufficient to produce the modeled increase of 1-2% in extent of melting between the youngest Palehua magmas and the posterosional magmas of the Kolekole Member. The association between magmatic change and a giant landsliding event suggests that there may be a general relationship between large mass-wasting events and subsequent magmatism in Hawaiian volcano evolution.

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A five-collector system for the simultaneous measurement of argon isotope ratios in a static mass spectrometer

Cited by 39 publications

References 8 publications

First-principles calibration of 38Ar tracers :implications for the ages of 40Ar/39Ar fluence monitors

First-principles calibration of 38Ar tracers :implications for the ages of 40Ar/39Ar fluence monitors

Style and age of late Oligocene‐early Miocene deformation in the southern Stillwater Range, west central Nevada: Paleomagnetism, geochronology, and field relations

Postshield volcanism and catastrophic mass wasting of the Waianae Volcano, Oahu, Hawaii

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