untitled
<OAI-PMH schemaLocation=http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd>
<responseDate>2018-01-15T15:43:24Z</responseDate>
<request identifier=oai:HAL:hal-00197563v1 verb=GetRecord metadataPrefix=oai_dc>http://api.archives-ouvertes.fr/oai/hal/</request>
<GetRecord>
<record>
<header>
<identifier>oai:HAL:hal-00197563v1</identifier>
<datestamp>2018-01-11</datestamp>
<setSpec>type:ART</setSpec>
<setSpec>subject:sdu</setSpec>
<setSpec>subject:sde</setSpec>
<setSpec>subject:phys</setSpec>
<setSpec>collection:CNRS</setSpec>
<setSpec>collection:SDE</setSpec>
<setSpec>collection:GM</setSpec>
<setSpec>collection:GIP-BE</setSpec>
<setSpec>collection:AGROPOLIS</setSpec>
<setSpec>collection:INSU</setSpec>
<setSpec>collection:B3ESTE</setSpec>
<setSpec>collection:UNIV-AG</setSpec>
<setSpec>collection:UNIV-MONTPELLIER</setSpec>
</header>
<metadata><dc>
<publisher>HAL CCSD</publisher>
<title lang=en>Evidence for excess argon during high pressure metamorphism in the Dora Maira Massif (Western Alps, Italy), using an ultra-violet laser ablation microprobe (super 40) Ar- (super 39) Ar technique</title>
<creator>Arnaud, Nicolas</creator>
<creator>Kelley, Simon P</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Departement of Earth Sciences ; Open University</contributor>
<description>International audience</description>
<source>ISSN: 0010-7999</source>
<source>EISSN: 1432-0967</source>
<source>Contributions to Mineralogy and Petrology</source>
<publisher>Springer Verlag</publisher>
<identifier>hal-00197563</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00197563</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00197563/document</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00197563/file/Excess_UV_Arnaud_and_Kelley_GCA_Pub_preprint.pdf</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00197563</source>
<source>Contributions to Mineralogy and Petrology, Springer Verlag, 1995, 121 (1), pp.249-264</source>
<language>en</language>
<subject lang=en>High pressure rocks</subject>
<subject lang=en>Ar-Ar</subject>
<subject lang=en>UV laser ablation</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG.CPE] Environmental Sciences/Global Changes/domain_sde.mcg.cpe</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The age of Ultra-high pressure metamorphism and early cooling remains controversial in the Alps. In a new approach to the problem, samples from the undeformed Hercynian metagranite, Brossasco, were studied using an ultra-violet laser ablation microprobe technique for 40Ar-39Ar dating. The results demonstrate the frequent occurence of excess argon with high 40Ar/36Ar ratios (1000-10000) and a strong relationship between apparent ages and metamorphic textures. The highest excess argon ratios are always associated with high closure temperature minerals or large diffusion domains within single mineral phases. The best interpretation of this relationship seems to be that excess argon was incorporated in all phases during the high pressure event, then mixed with an atmospheric component during rapid cooling and retrogression, producing a wide range of argon concentrations and 40Ar/36Ar ratios. In the present case, some ages in the range 60-110 Ma could be explained by the presence of excess argon incorporated around 40-50 Ma ago. Similar results found in other high-pressure terrains in the Alps may reconcile the argon geochronometer with other systems such as Rb/Sr, U/Pb or Sm/Nd. This study therefore calls for an increasing use of high resolution in-situ sampling techniques to clarify the meaning of 40Ar/39Ar ages in many high pressure terrains.</description>
<date>1995-04-04</date>
</dc>
</metadata>
</record>
</GetRecord>
</OAI-PMH>
