Browsing ELibrary by Subject "ZIRCON"
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Browsing ELibrary by Subject "ZIRCON"
Now showing items 1-15 of 15
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(2002)Thorough understanding of the shock metamorphic signatures of zircon could be the basis for the use of this mineral as a powerful tool for the study of old, deeply eroded, and metamorphically overprinted impact structures ...
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(2001)Zircon crystallized from felsic magmas typically (if not ubiquitously) develop compositional growth zonation that is easily imaged by cathodoluminescence (CL). This zonation represents inherently unstable chemical gradients ...
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(2001)Isotopic composition of zirconium from eight zircon and two baddeleyite samples including meteoritic zircon have been measured using a laser ablation-multiple collector-inductively coupled plasma mass spectrometer ...
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(1999)In recent years, apparently shock-induced and, thus, impact-characteristic microdeformations, in the form of planar microdeformation features and so-called strawberry (granular) texture, have been observed in zircons in ...
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(2003)Increasing temperature causes fading of fission tracks (FTs) in minerals, which has been quantified by many laboratory heating experiments in atmosphere. In order to elucidate whether or not FT annealing at hydrothermally ...
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(1997)The internal structure of zircon is commonly revealed by back-scattered electron (BSE) images. Grains from a 750-700 Ma old calc-alkaline mafic metatonalite from southernmost Brazil show relict igneous faces, irregular and ...
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(2003)Fission track (FT) analysis of zircon from rhyolite and sandstone samples of Ministry of International Trade and Industry (MITI)-Nishikubiki and MITI-Mishima boreholes has given additional constraints on the temperature ...
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(2002)The concentrations of all rare earth elements (REE: La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) in silicate glass, apatite and zircon were measured by an ion microprobe method with a high mass resolving power ...
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(2000)We present a simple new background modeling method particularly for the determination of trace concentrations of Pb, U and Th to date zircons chemically by electron microprobe. This method reduces the acquisition time ...
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(2003)The in situ Pb geochronological capabilities of a laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) coupling a magnetic sector ICP-MS with a Nd:YAG laser probe working at 213 nm have been tested on ...
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(1997)Oxygen diffusion in natural, non-metamict zircon was characterized under both dry and water-present conditions at temperatures ranging from 765°C to 1500°C. Dry experiments were performed at atmospheric pressure by ...
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(2001)Zircons from two Archean samples, a 2732-Ma trondhjemite and a 2728-Ma dacite, both from the western Superior province, were washed in hydrofluoric acid (HF) at moderate temperatures. Zircon residues and HF wash solutions ...
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(1997)Diffusion rates for three rare-earth elements (REEs: Sm, Dy, Yb) have been measured in synthetic and natural zircon. REE-phosphate powders were used as the source of diffusant, with Rutherford backscattering spectrometry ...
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(2003)Derivation of Phanerozoic zircon 206Pb/238U ages by SHRIMP depends on calibration against an independently dated standard. The qualities of four different zircon standards (SL13, QGNG, AS3 and TEMORA 1) are assessed herein. ...
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(2003)We performed a systematic study of (U-Th)/He ages of volcanic zircons of known eruption age to establish a reliable protocol for zircon He dating and to validate the resulting ages. Using laser He extraction and dissolution ...
Now showing items 1-15 of 15