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40Ar/39Ar incremental release age of biotite from a gabbro

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Utah Geological Association Publication 30 - Pacific .

age constraints on the Miocene volcanic stratigraphy and Iron Axis magmatism of this region. We present the results of 40Ar/39Ar incremental release dates on plagioclase separated from six volcanic samples collected in the Pinto Quadrangle. The age of the Harmony Hills tuff (Quichapa Group), a key

Petrology, Geochronology, Mineralogy, and Geochemistry of .

Dallmeyer (1975) obtained 40Ar/39Ar biotite and hornblende ages for the Cortlandt and Rosetown complexes ranging between 420 and 450 Ma. A K-Ar age of 448 ± 14 Ma was reported by Long and Kulp (1962) and a Sm-Nd isochron age of 430 ± 34 Ma was reported by Domenick and Basu (1982) for the Cortlandt complex.

The 40Ar/39Ar and U/Pb dating of young rhyolites in the .

Furthermore, the biotite 40 Ar/ 39 Ar ages proved to be extremely complex and disturbed. This paper provides a basis to reconcile this age discrepancy in terms of Ar systematics in biotite and also to present new and improved ages on volcanic units that pre-date the KPT on the Kefalos Peninsula (Kos Island, Greece).

Argon–argon dating - Wikiped

As long as a standard of known age is co-irradiated with unknown samples, it is possible to use a single measurement of argon isotopes to calculate the 40 K/ 40 Ar* ratio, ...

Permian 40Ar/39Ar ages for post-Variscan minor intrusions in the Iberian Range and Spanish Central System - CO

Abstract 40Ar/39Ar dating of biotite from a calc-alkaline gabbro stock NW of Loscos in the Iberian Range yielded a slightly disturbed gas release spectrum. It has an early Permian, 288.5 ± 1.4 Ma total gas age, interpreted as the minimum emplacement age. The ...

40Ar/39Ar Dating: Principles, Techniques, and Applications in Orogenic Terranes | SpringerLi

Dallmeyer, R.D.: 40 Ar/ 39 Ar incremental release ages of biotite and hornblende from pre-Kenoran gneisses between the Matagarni-Chibougamau and Frotet-Troilus greenstone belts, Quebec. Can. J. Earth Sci. 11, 1586–1593 (1974) CrossRef Google Scholar

biocycle.atmos.colostate.e

Four hornblende samples from the Horserace quartz diorite dated by the 40Ar/39Ar incremental heating technique yield plateau age spectra concordant at 2 sigma with a mean of 374.9± 3.2 Ma. Biotite samples from the ...

39Ar dating of the - MAFIADOC.C

Single-zircon Pb-evaporation and 40Ar/39Ar dating of the metamorphic and granitic rocks in north-west Spitsbergen Yoshihide ... A large population of zircon grains with Late Palaeoproterozoic ages suggests a wide surface exposure of rocks of this age in the , c ...

Acquisitional chronology of remanent magnetization along the ‘Grenville Polar Path’: Evidence from 40Ar/39Ar ages of hornblende and biotite .

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40Ar/39Ar incremental-release ages of hornblende and biotite from Grenville basement rocks within the Indian Head Range complex, southwest .

Download Citation on ResearchGate | 40Ar/39Ar incremental-release ages of hornblende and biotite from Grenville basement rocks within the Indian Head Range complex, southwest Newfoundland: their bearing on Late Proterozoic – Early Paleozoic thermal history ...

hornblende diorite - English-French Dictionary - Glos

hornblende gabbro hornblende gneiss hornblende granite hornblende hornfels facies hornblende rootname series hornblende schist hornblende-gneiss hornblende-hornfels facies hornblende-schist hornblendic gneiss hornblende diorite in French translation and ...

Direct dating of mid-Cretaceous alteration of the .

low-temperature steps of 40Ar/39Ar incremental heating experiments record dates between 100 and 120 million years. These dates have also been used to estimate the age of alter-ation (Fleming et al. 1993; Foland et al. 1993). These mini-mum ages agree in general with the time of alteration inferred by other methods.

Precambrian database PALEOMAGIA - Age referenc

40Ar/39Ar dating of the Thanet gabbro, Ontario: looking through the Grenvillian metamorphic veil and implications for paleomagnetism ... 40Ar/39Ar incremental-release ages of hornblende and biotite from Grenville basement rocks within the Indian Head range complex, southwest Newfoundland: Their bearing on Late Proterozoic - early Paleozoic ...

40AR 39AR THERMOCHRONOLOGY: A METHOD FOR PRECISE AGE .

weighted mean plateau age of 2055.2 ±3.2 Ma (recalcu-lated assuming an age of 28.201 Ma for Fish Canyon Sanidine [13]) which suggests a rapid cooling rate of ~1000°C/Ma to the closure temperature of biotite. Cas-sata et al. [6] measured Ar-Ar ages in plagioclase from a gabbro in the Critical Zone of the RLS and confirmed the

40Ar/39Ar incremental-release ages of biotite from a progressively remetamorphosed Archean basement terrane in southwestern Labrador - ScienceDire

Earth and Planetary Science Letters, 61 (1982) 85-96 85 Elsevier Scientific Publishing Company, Amsterdam - Printed in The Netherlands [61 4r/39Ar incremental-release ages of biotite from a progressively remetamorphosed Archean basement terrane in ...

diorite - translation - French-English Dictionary - Glos

en Incremental-heating 40Ar–39Ar dating of hornblende and biotite from the Mountain Grove diorite yields plateau ages of 1058 ± 14 and 1047 ± 4 Ma, respectively, and an exoskarn phlogopite age of 1074 ± 5 Ma.

University Oral Defense - MIGUEL CRUZ: NEW APPLICATIONS OF .

We dated a suite of three-billion-year-old biotite and phlogopite from southwestern Greenland by 40Ar/39Ar and in situ K–Ca methods. The 40Ar/39Ar ages were generally consistent with previous estimates based on U-Pb zircon and field observations, yielding ages clustered near 3 Ga (peak granulite facies metamorphism) and 2.5 Ga (the age of ...

AR/ AR DATA FROM THE EASTERN MO RAN AREA, TANANA B-6 AND C .

Gabbro from the Tozitna Terrane (Rampart Group) has a hornblende K-Ar age of 210 ± 6 Ma (Patton and others, 1977). In the Ruby Mining district, metamorphic rocks have K-Ar cooling ages of 61.9 ± 1.9 from biotite, and 71.3 ± 2.2 from muscov ite. The Melozitna Pluton has a K-Ar biotite cooling age of 111 ± 3 Ma (Patton and others , 1978).

K-Ar and 40Ar/39Ar evidence for a transamazonian age (2030 .

K-Ar and 40Ar/39Ar evidence for a Tkansamazonian age ... The disturbances of 40Ar/39Ar release spectra testify to the existence of a hydrothermal heating that overprinted the K-Ar clock of biotite and to a less extent phlogopite. This event is clearly subsequent to the Transamazonian granitizaíion and emerald miner-

Not So Subjective Ar-Ar Spectra and Not so Objective .

Not So Subjective Ar-Ar Spectra and Not so Objective Biblical Interpretations ... '40Ar/39Ar age-spectrum analysis of a hydrothermally treated biotite yields a complex release pattern casting doubt on the general usefulness of such measurements for geochronological purposes.'