@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00068281v1> a dcat:Dataset ;
    dct:description """
              We present an experimental and petrological study aimed at estimating the pre-eruptive conditions of a Holocene dacitic lava from Volcán San Pedro (36°S, Chilean Andes). Phase-equilibrium experiments were performed at temperatures (T) from 800 to 950°C, and mainly at 200 MPa, but also at 55, 150, and 406 MPa. Oxygen fugacity (fO2) ranged from the Ni-NiO buffer (NNO) to 3*5 log units above (NNO + 3*5), and water contents from ~3 to ~6 wt %. We also report several experiments where we added sulphur (0*1-1 wt % S) to the dacite. The main mineral assemblage of the dacite (hornblende + orthopyroxene + plagioclase) is stable at 200 ± 50 MPa, 850 ± 10°C, with 4*5-5*5 wt % H2O in the melt, and at fO2 of NNO + 1*2 ± 0*2, in accord with the crystallinity, mineral proportions, and T-fO2 determination from Fe-Ti oxides of the lava. However, biotite, which is also present in the dacite, is stable at these same T-fO2 conditions only in experiments with >0*1 wt % S added. This result is in accord with the occurrence of pyrrhotite in the lava, and with the presence of S in glass inclusions and biotite (~300 ppm, and up 170 ppm, respectively). Moreover, the zoning patterns and compositions of plagioclase phenocrysts together with the presence of high-temperature minerals (e.g. clinopyroxene) in the lava suggest that the petrological history of the dacite is more complex than a single near-equilibrium crystallization stage, and could be explained by short-lived (<100 years) temperature fluctuations (~50°C) in the magma reservoir.
            """ ;
    dct:identifier "hal-00068281" ;
    dct:issued "2026-05-23T10:58:13.932945"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-23T10:58:13.932951"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Petrological and experimental constraints on the pre-eruption conditions of holocene dacite from volcan San Pedro (36°S, Chilean Andes)and the importance of sulphur in silicic subduction-related magmas." ;
    dcat:contactPoint [ a vcard:Organization ;
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    dcat:keyword "andes",
        "biotite",
        "dacite",
        "experiments",
        "infoeu-reposemanticsarticle",
        "journal-articles",
        "sdemcgenvironmental-sciencesglobal-changes",
        "sdustuvosciences-of-the-universe-physicsearth-sciencesvolcanology",
        "ulphur" ;
    dcat:landingPage <ISSN:%200022-3530> .

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<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-hal-00068281v1/resource/c550b2b4-ef62-4638-b4a6-ca4b1bbb4d71> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-23T10:58:14.005462"^^xsd:dateTime ;
    dct:modified "2026-05-23T10:58:13.909095"^^xsd:dateTime ;
    dct:title "Petrological and experimental constraints on the pre-eruption conditions of holocene dacite from volcan San Pedro (36°S, Chilean Andes)and the importance of sulphur in silicic subduction-related magmas." ;
    dcat:accessURL <https://insu.hal.science/hal-00068281> .

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