Time is k ar dating laboratory fundamental parameter in the Earth Sciences whose knowledge is essential for estimating the length and rate of geological processes. The 40 Ar- 39 Ar method, variant of the K-Ar method, lsboratory based on the radioactive decay of k ar dating laboratory naturally occurring parent 40 K half-life 1.

The 40 Ar- 39 Ar method, applied to K-bearing systems minerals or glassrepresents one of the most powerful geochronological tools currently available to constrain the timing of geological processes. It can be applied to a wide range of geological problems and to rocks ranging in age from a few thousand years to the oldest rocks available. The development of the laser extraction technique has expanded fields of application, including among others:.

The laserprobe system includes two Nd: Gianfranco di Vincenzo Ph. CNR Researcher - Head Laboratory Dr. Marinella Ada Laurenzi CNR Researcher Antonietta Grande Ph. The greatest advantage of the laser extraction method over the k ar dating laboratory furnace extraction is that it permits analysis of very small samples down to a few micrograms or even less in same cases.

The ability to analyze very small samples allows a great analytical versatility. A geological problem maybe in principle approached using different extraction methods and just one instrument, including:. The method can be applied to a variety of K-bearing systems, including among others: The 40 Ar— 39 Ar facility at IGG was funded by the Programma Nazionale di Ricerche in Antartide PNRA and it is part of the intalian network of antarctic laboratories SIA.

During the past ten years the IGG 40 Ar- 39 Ar geochronology laboratory was actively involved in several scientific projects funded by the: Within the period the laboratory was involved in the international ANDRILL-SMS project to constrain k ar dating laboratory age model of the AND-2A core. Researches span from the geodynamic evolution of Antarctica during the Proterozoic-Paleozoic, geodynamics of the Ross Sea region during the Cenozoic, to evolution of the climate-cryosphere system during the Neogene-Quaternary.

Lqboratory of ductile mylonites and brittle pseudotachylytes faults; reactivation of faults and shear zones; k ar dating laboratory paboratory of siliciclastic sediments; high-precision dating of impact glasses tektites and Quaternary volcanic rocks; chronological reconstruction of Italian Plio-Pleistocenic magmatism; chronostratigraphic laboratogy relationship between tectono-metamorphic evolution and isotope records in metamorphic minerals.

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Home Instruments and Personnel Methods and Applications Projects and Scientific Interests Publications. The development of the laser extraction technique has expanded fields of application, including among others: The 40Ar—39Ar laboratory at IGG-CNR. More than Ma geological record from the Morozumi Range Antarctica: Melting a single sanidine crystal through the CO2 laser. In-situ dating of a biotite flake using the pulsed UV laser. MAP noble gas llaboratory spectrometer MS ; a low volume UHV gas lzboratory system; a laser extraction system consisting of three different laser probes.

YAG laser probes, beam optics and the microscope. The MIR CO2 laser system. STAFF Gianfranco di Vincenzo Ph. A geological problem maybe in principle approached using different extraction methods and just one instrument, including: Total fusion ages of alkali feldspar separated from a primary tephra layer in glaciomarine sediments AND-2A core, ANDRILL-SMS. Total fusion ages of single detrital llaboratory micas Wm d from a low-grade metapelite Robertson Bay turbidites, northern Victoria Land, Antarctica.

PROJECTS During the past ten years the IGG 40 Ar- 39 Ar geochronology laboratory was actively involved in several scientific projects funded by the: Other recent significant Projects RITMARE FLAGSHIP funded by MIUR K ar dating laboratory [SP4 Deep Sea -WP1]. Priestley Glacier, northern Victoria Land Antarctica. Melbourne, a Quaternary stratovolcano m from northern Victoria Land.

Back-scattered electron image of microtextures in a fault-generated friction melt pseudotachylyteresembling those of volcanic rocks.

Ar-Ar Geochronology Laboratory

In section samples, the UV pulsed laser is able to ablate spots with minimum diameters of a few tens of micrometers. Argon, being a noble gas , is a minor component of most rock samples of geochronological interest: Whole rocks — volcanics, slates, phyllites. Following his untimely death in , Prof. As the K in the rock decays into Ar, the gas is trapped in the rock. The sample is generally crushed and single crystals of a mineral or fragments of rock hand-selected for analysis. Conversion to stable 40 Ar occurs via electron capture in the remaining Feldspathoids — leucite, nepheline. Argon—argon dating has the advantage of not requiring determinations of potassium.