Formation temperatures of clays from the volcaniclastic series of Site 841 ODP: an oxygen isotopic record of a paleothermal flux into the Tonga forearc

Vitali, Frédéric; Blanc, Guillaume; Gauthier-Lafaye, F.; France‐Lanord, Christian

doi:10.1007/s004100050490

Cited by 3 publications

(2 citation statements)

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“…The clay fraction of the samples was separated by settling following the method described in Larqué and Weber [27] and Holtzapffel [24]. Clay types were determined by X-ray diffraction, scanning electron microscopy, and analyt-ical electron microscopy [47,49] and the formation temperatures were estimated using measurements of their oxygen isotopes [50]. Unfortunately one whole rock sample (841B 54R2) was lost before the measurements were made.…”

Section: Methodsmentioning

confidence: 99%

“…In the present study, we attempt to correlate chemical and Sr isotopic patterns with the associated mineralogy and temperature of crystallization previously established using oxygen-isotopes in clays [50] in order to reconstruct the origin and the transformation of the sediments. Strontium and Rare Earth Elements (REE) distributions in sedimentary material appear to have the potential to be a powerful diagnostic tool in various geological settings.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Silicate diagenesis in deep-sea sediments from the Tonga forearc (SW Pacific): a strontium and Rare Earth Elements signature

Vitali¹,

Blanc

Toulkeridis

et al. 2000

Oceanologica Acta

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87 Sr/ 86 Sr isotopic ratios, strontium and Rare Earth Element concentrations obtained on volcano-sedimentary rocks and separated clay mineral and zeolite fractions reveal a formation by pore water-volcanic rock interaction for most of the hydrous silicate minerals of the Site 841 ODP collected from the Tonga forearc. Unusual strontium concentrations and isotopic ratios recorded in the Miocene tuffs associated with specific REE patterns indicate that the formation of these hydrous silicates does not follow a simple burial diagenesis model, but was related to the cooling of intruding basaltic sills in the Miocene volcano-sedimentary series. Migration of strontium into the pore water in response to the heat flow induced the formation of Sr-bearing zeolites such as clinoptilolite, heulandite and chabazite. No evidence of any influence of a further thermal pulse in the Eocene rhyolitic tuffs could be found. As recorded by the chemistry of their clay mineral fraction, the rhyolitic tuffs developed a polyphasic diagenetic process, which might have been influenced by a possible circulation of a fluid into structurally weak areas. © 2000 Ifremer/CNRS/IRD/É ditions scientifiques et médicales Elsevier SAS Tonga / silicates / strontium / Rare Earth Elements / diagenesis / heat flow Résumé-Diagenèse des silicates des séries sédimentaires de l'avant-arc Tonga (Pacifique sud-ouest) : étude de la signature en strontium et en terres rares. Les concentrations en strontium et en terres rares, ainsi que les rapports isotopiques 87 Sr/ 86 Sr des roches volcano-sédimentaires et des fractions argileuses et zéolitiques indiquent que la plupart des silicates hydratés du site 841 ODP de l'avant-arc Tonga se sont formés par interaction entre les roches volcaniques et les eaux interstitielles. Les concentrations et rapports isotopiques en strontium inhabituels, enregistrés dans les tufs du Miocène associés à des profils de terres rares spécifiques, indiquent que la formation de ces silicates hydratés ne suit pas un modèle de simple diagenèse d'enfouissement Elle est en relation directe avec le refroidissement d'intrusions de sill basaltiques dans les séries volcano-sédimentaires du Miocène. La migration du strontium dans les fluides interstitiels, en réponse au flux de chaleur, a entrainé la formation de zéolites contenant du strontium, telles que les clinoptilolite, heulandite et chabazite. Dans les tufs rhyolitiques de l'É ocène, aucune influence d'un flux thermique n'a été détectée. La chimie de la fraction argileuse de ces tufs indique qu'ils ont subi une diagenèse polyphasée probablement influencée par la circulation d'un fluide à travers leurs failles.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%