Unusual diagenetic alteration of volcanoclastic sediments in the Tonga fore-are: Evidence from chemical and strontium isotopic compositions of interstitial waters

Blanc, Guillaume; Vitali, Frédéric; Stille, Peter

doi:10.1016/0016-7037(95)00317-7

Cited by 10 publications

(12 citation statements)

References 19 publications

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“…This mineralogical observation added to the similitude of this mineral strontium concentration with the whole rocks, and the similitude of the 87 Sr/ 86 Sr ratio of zeolites with that of a volcanic glass argue for an incorporation of elements in zeolites directly from the volcanic glass. This might be possible in the case of a fast crystallization of zeolite minerals from the reactive zone, which seems to be also recorded by the REE, and which independently has been proposed due to modelisation based on the pore water concentration of Na and Cl [6].…”

Section: -605 Mbsfmentioning

confidence: 69%

“…alteration of the volcanic material in response to the cooling of the intrusive sills into the Miocene tuffs. Such pore water-volcanic material interactions also depleted the 87 Sr/ 86 Sr ratios of pore water from the reactive zone to values between 0.705528 to 0.70536 [6] (figure 9). However, 87 Sr/ 86 Sr ratios of zeolites are closer to those of an average volcanic glass (0.704 approximately) than the clay minerals located at the same depth.…”

Section: -605 Mbsfmentioning

confidence: 98%

“…According to Desprairies and Bonnot-Courtois [13], the similarity between the REE pattern of authigenic minerals and of the initial rocks is a sign of the rapidity in crystallization of these minerals. pore water present in the reactive zone argues for a recent crystallization of these minerals in response to the thermal pulse due to the cooling of the basaltic sills [6] whereas 87 Sr/ 86 Sr ratios from Tonga basaltic andesites varied between 0.7036 and 0.7043 [16,17]. These values are close to those obtained on young volcanic rocks (andesites, rhyolites) and usually of 0.704+/− 0.002 [18,19,44] isotopic ratio of the whole rock (and by extrapolation of an average and young volcanic rock) and of those of seawater contemporaneous to sediment deposition (figure 7).…”

Section: -605 Mbsfmentioning

confidence: 99%

“…Figure 9. Concentration-depth profiles for Sr and 87 Sr/ 86 Sr of pore waters, site 841, from [6]. Plate 1.…”

Section: The Rhyolitic Tuffsmentioning

confidence: 99%

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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: -605 Mbsfmentioning

confidence: 69%

Section: -605 Mbsfmentioning

confidence: 98%

Section: -605 Mbsfmentioning

confidence: 99%

“…Figure 9. Concentration-depth profiles for Sr and 87 Sr/ 86 Sr of pore waters, site 841, from [6]. Plate 1.…”

Section: The Rhyolitic Tuffsmentioning

confidence: 99%

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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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“…In our work, we use the definition by Hardie (1983) to refer to CaCl 2 brines. These brines occur in a wide variety of geological settings, including saline lakes (Katz and Starinsky, 2008); volcanic or sub-volcanic geothermal provinces (Lowenstein and Risacher, 2008); submarine hydrothermal vents associated to rift zones (Hardie, 1983); oil fields (Gavrieli et al, 1995); and, volcaniclastic-rich sediments with abundant hydrated authigenic minerals (Egeberg et al, 1990;Martin, 1994;Blanc et al, 1995). Different biogeochemical, solute transport and evaporation processes lead to the formation of the CaCl 2 brines found in this wide range of geological settings.…”

Section: Introductionmentioning

confidence: 99%

Formation of calcium chloride brines in volcaniclastic-rich sediments

Sena

Parkhurst²,

Tepley

et al. 2022

Front. Earth Sci.

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The Amami-Sankaku Basin, located in the Philippine Sea, records approximately 50 million years of sediment accumulation and diagenesis of volcanic ash derived from the Kyushu-Palau and Kyushu-Ryukyu arcs. Analyses of porewater and sediment samples from the 1461-m core recovered at IODP Expedition 351, Site U1438, included major and trace elements, strontium radiogenic isotope ratio (87Sr/86Sr), and taxonomic identification of archaeal classes and bacterial orders. Sediment X-ray diffraction and thin section analyses show that smectite, zeolites and chlorite are the main authigenic minerals. A multicomponent solute diffusion and reaction numerical model was developed to simulate the long-term diagenesis that took place in this sedimentary sequence and to account for the transition to a calcium chloride brine at about 670 mbsf. Numerical results indicate that 45% of the initial amount of volcanic ash has been dissolved at 750 mbsf. At this depth, 13% of the initial water (H2O) in the pore space is estimated to have been transferred to the solid phase by the formation of zeolites, which accounts for an increase in porewater chloride concentration. In contrast, dissolution of anorthite and volcanic ash combined with sodium uptake by zeolites accounts for the predominance of calcium in the brine. In the upper 160 m of the sedimentary column, the electrochemical migration of solutes causes chloride to move in the opposite direction of the concentration gradient, i.e., uphill diffusion, sustaining downward diffusion of seawater chloride into the sediments.

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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

Blanc

Gauthier-Lafaye

et al. 1999

Contributions to Mineralogy and Petrology

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Unusual diagenetic alteration of volcanoclastic sediments in the Tonga fore-are: Evidence from chemical and strontium isotopic compositions of interstitial waters

Cited by 10 publications

References 19 publications

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

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

Formation of calcium chloride brines in volcaniclastic-rich sediments

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

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