Добірка наукової літератури з теми "Datation Rb-Sr"
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Статті в журналах з теми "Datation Rb-Sr":
Mifdal, Aïcha, and Jean-Jacques Peucat. "Datations U-Pb et Rb-Sr du volcanisme acide de l'Anti-Atlas marocain et du socle sous-jacent dans la région de Ouarzazate. Apport au problème de la limite Précambrien-Cambrien. U-Pb and Rb-Sr dating of acidic volcanic rocks and Precambrian basement in Anti-Atlas of Morocco (Ouarzazate). Contribution for numerical dating of Precambrian-Cambrian boundary." Sciences Géologiques. Bulletin 38, no. 2 (1985): 185–200. http://dx.doi.org/10.3406/sgeol.1985.1706.
Дисертації з теми "Datation Rb-Sr":
Gyomlai, Thomas. "In-situ Rb-Sr dating, a precise and efficient tool in metamorphic petrology." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS267.pdf.
Dating a specific pressure-temperature-time-deformation-fluid event is a major issue in metamorphic petrology where rocks are strongly chemically modified, deformed and displaced from their protoliths. Because recrystallization and diffusion processes occur at the sub-millimeter scale and because of the significant presence of zonations and inclusions in metamorphic minerals, the use of in-situ methods is mandatory in order to analyze the chemical and isotopic variations related to different events recorded within a mineral or mineral generation. This work focuses on the implementation of the Rb-Sr in-situ dating method of mica and its application to metamorphic petrology. In-situ analyzes are allowed thanks to a laser ablation system coupled to a mass spectrometer containing a reaction cell between two quadrupoles, which allows the separation of isobaric isotopes 87Rb and 87Sr using a reactive gas (NO2). This method, with the in-situ 40Ar-39Ar dating, are the only two in-situ methods that can date a dominant and ubiquitous phase of metamorphic rocks (mica) over a wide range of metamorphic grades and ages. Furthermore, the Rb-Sr in-situ method requires little preparation compared to 40Ar-39Ar, and is therefore a highly competitive new method. Biotite provides exhumation ages in medium to high-temperature metamorphic settings and white mica provides recrystallization ages in high pressure-low temperature contexts. The application to 3 contexts (79 ages) of this method coupled with other dating methods (U-Pb titanite, 40Ar-39Ar mica) as well as structural and petrogeochemical data allowed a better understanding of the tectonometamorphic events affecting the studied areas: 1) A Cimmerian collisional metamorphism (∼200 Ma) in central Iran corresponding to shortening outboard of the main suture, followed by exhumation since ∼170 Ma in an extensive context. 2) Several punctual and heterogeneous metasomatic episodes (∼36 Ma and ∼12 Ma) affecting a "mélange" unit during exhumation on the island of Syros in Greece. 3) A diachronous maximum burial (∼36-52 Ma) of the different units of the Schistes Lustrés in the Western Alps. These results illustrate the possibilities of the Rb-Sr in-situ dating method as well as its efficient application to metamorphic petrology
Jegal, Yujin. "Développement des mesures isotopiques in situ Rb-Sr par LA-ICP-MS et microsonde ionique pour la datation à petite échelle des processus géologiques." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0343.
The new generation of laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS/MS) and SIMS IMS-1280-HR2 with high resolving powder (~40,000) allows to analyze at micro-scale level directly on minerals and resolve the isobaric overlaps of 87Rb on 87Sr by introducing a reaction gas via a reaction cell and high resolving power, respectively. Rb-Sr isotope measurements of Rb-rich minerals (e.g., micas and potassium feldspars) by in-situ methods enable to date minerals in ore deposits where datable minerals for traditional isotopic systems (e.g., U-Pb zircon) are lack and/or affected by alteration that disturbs the geochronometers. Testing these innovative approaches is the main objective of this PhD thesis. The aim of this thesis is (i) to characterize and certify the Rb-Sr isotopic values of mica and feldspar reference materials (RMs) suitable for in-situ Rb-Sr dating, (ii) to demonstrate the feasibility and capability of in-situ methods to measure Rb-Sr isotopic system by LA-ICP-MS/MS and SIMS and (iii) to apply in-situ Rb-Sr dating using the characterized RMs and optimized analytical conditions of LA-ICP-MS/MS to geological case studies. Four CRPG RMs including phlogopite Mica-Mg, biotite Mica-Fe, glauconite GL-O and potash feldspar FK-N are characterized as potential reference materials for in-situ Rb-Sr measurements by LA-ICP-MS/MS. Rb/Sr and Sr isotopic ratios of the four RMs were determined by isotope dilution TIMS and MC-ICP-MS. The RMs are assessed for their suitability for the in-situ Rb-Sr dating method. Results suggest that Mica-Mg is the most appropriate RM for dating of mica samples. Then, matrix effect of LA-ICP-MS/MS on accuracy and precision of Rb-Sr dating is investigated by using different matrix RMs (synthetic silicate glass, geological glass and mineral powder RMs) and natural mineral samples. The result shows a correlation between major element compositions of the RMs and accuracy of 87Rb/86Sr measured by LA-ICP-MS/MS. Based on this result, a new calibration approach using non matrix-matched RMs is proposed and evaluated comparing with a approach using RMs matrix-matched with target mineral samples. Finally, in-situ Rb-Sr dating by LA-ICP-MS/MS apply to case studies to constrain the timing and duration of fluid circulation processes at Quiberon detachment zone, South Armorican Massif (France). Based on the in-situ analysis of multiple mineral phases in leucogranites and associated pegmatic dykes, the results indicate that Rb-Sr ages ranges from 300.6 ± 3.8 Ma to 281.2 ± 3.8 Ma, which are younger than the known ages of emplacement of syn-tectonic leucogranites within this domain and are corresponding to the U mineralization at 270-300 Ma. Rb-Sr ages obtained for this zone indicate the global event of circulation of salty water which affected the South Armorican Domain between 300 and 270 Ma. This thesis provides the recommended 87Sr/86Sr and 87Rb/86Sr values and related uncertainties for the four tested RMs to use for in-situ Rb-Sr dating via LA-ICP-MS/MS. Finally, this work gives characterization of matrix effect and new methodological approaches for in-situ Rb-Sr dating by LA-ICP-MS/MS for samples with a variety of matrix to be further validated and applied in ore deposits
Dos, Santos Rosa Penha. "Datation K/Ar et Rb/Sr d'argiles de minéralisations et de diagénèse le long de la côte Est de l'Amérique du Sud : Implications géodynamiques." Grenoble 1, 1994. http://www.theses.fr/1994GRE10108.
CUVELLIER, HENRI. "Etude isotopique (rb-sr et u-pb) des carbonates proterozoiques du craton sino-coreen et du brioverien de bretagne centrale : implications sur la datation directe des sequences sedimentaires." Rennes 1, 1992. http://www.theses.fr/1992REN10089.
Bouchet, Gilles. "Mélanges magmatiques et genèse des granitoïdes calco-alcalins : l'exemple du complexe tonalo-granodioritique de Bono (Sardaigne septentrionale) : étude pétrologique et géochimique." Saint-Etienne, 1992. http://www.theses.fr/1992STET4022.
Toteu, Sadrack-Félix. "Chronologie des grands ensembles structuraux de la région de Poli : Accretion crustale dans la chaîne panafricaine du Nord Cameroun." Nancy 1, 1987. http://www.theses.fr/1987NAN10057.
Moulahoum, Omar. "Dualité du magmatisme d'âge pan-africain : Aspects structuraux et pétrologiques des granites subalcalins et alumineux de la région de Tamanrasset (Hoggar central, Algérie." Nancy 1, 1988. http://www.theses.fr/1988NAN10049.
Djama, Louis-Marie. "Le massif granitique de Mfoubou et le socle métamorphique de Guena (chaîne du Mayombe, Congo). Pétrologie - Géochimie - géochronologie." Nancy 1, 1988. http://www.theses.fr/1988NAN10116.
Dos, Santos Rosa. "Datation K/Ar et Rb/Sr d'argiles de minéralisations et de diagenèse le long de la cote Est de l'Amérique du Sud : implications géodynamiques." Phd thesis, 1994. http://tel.archives-ouvertes.fr/tel-00708614.
Книги з теми "Datation Rb-Sr":
Cuvellier, Henri. Etude isotopique (U-Pb et Rb-Sr) des carbonates properozoiques du craton sino-coreen et du brioverien de Bretagne Centrale: Implications sur la datation directe des séquences sédimentaires. 1992.