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

If you want to confirm some technical details before you order,
just need to send a message or e-mail: [email protected].
Then our professional sales staff will contact you within 2 hours.

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


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 .

About Cookies, including instructions on how to turn off cookies if you wish to do so. By continuing to browse this site you agree to us using cookies as described in About Cookies. Remove maintenance message

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 ...


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 ...


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.'