Item talk:Q306071

{

 "USGS Publications Warehouse": {
   "@context": "https://schema.org",
   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Magmatic (silicates/saline/sulfur-rich/CO2) immiscibility and zirconium and rare-earth element enrichment from alkaline magma chamber margins : Evidence from Ponza Island, Pontine Archipelago, Italy",
   "identifier": [
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse IndexID",
       "value": "70018116",
       "url": "https://pubs.usgs.gov/publication/70018116"
     },
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse Internal ID",
       "value": 70018116
     },
     {
       "@type": "PropertyValue",
       "propertyID": "ISSN",
       "value": "09351221"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "European Journal of Mineralogy",
     "volumeNumber": "8",
     "issueNumber": "6"
   },
   "inLanguage": "en",
   "isPartOf": [
     {
       "@type": "CreativeWorkSeries",
       "name": "European Journal of Mineralogy"
     }
   ],
   "datePublished": "1996",
   "dateModified": "2012-03-12",
   "abstract": "Fluid inclusions were measured from a feldspathoid-bearing syenite xenolith entrained in trachyte from Ponza, one of the islands of the Pontine Archipelago, located in the Gulf of Gaeta, Italy. The feldspathoid-bearing syenite consists mainly of potassium feldspar, clinopyroxene, amphibole, biotite, titanite, manganoan magnetite, apatite with minor nosean, Na-rich feldspar, pyrrhotite, and rare cheralite. Baddeleyite and zirkelite occur associated with manganoan magnetite. Detailed electron-microprobe analysis reveals enrichments in REE, Y, Nb, U, Th as well as Cl and F in appropriate phases. Fluid inclusions observed in potassium feldspar are either silicate-melt or aqueous inclusions. The aqueous inclusions can be further classified as. (1) one-phase vapor, (2) two-phase (V + L) inclusions, vapor-rich inclusions with a small amount of CO2 in most cases; homogenization of the inclusions always occurred in the vapor phase between 359 and 424??C, salinities vary from 2.9 to 8.5 wt. % NaCl equivalent; and. (3) three-phase and multiphase inclusions (hypersaline/sulfur-rich aqueous inclusions sometimes with up to 8 or more solid phases). Daughter minerals dissolve on heating before vapor/liquid homogenization. Standardless quantitative scanning electron microscope X-ray fluorescence analysis has tentatively identified the following chloride and sulfate daughter crystals; halite, sylvite, glauberite. arcanite, anhydrite, and thenardite. Melting of the daughter crystals occurs between 459 and 536??C (54 to 65 wt. % NaCI equivalent) whereas total homogenization is between 640 and 755??C. The occurrence of silicate-melt inclusions and high-temperature, solute-rich aqueous inclusions suggests that the druse or miarolitic texture of the xenolith is late-stage magmatic. The xenolith from Ponza represents a portion of the peripheral magma chamber wall that has recorded the magmatic/hydrothermal transition and the passage of high solute fluids enriched in chlorides, sulfur, and incompatible elements.",
   "publisher": {
     "@type": "Organization",
     "name": "U.S. Geological Survey"
   },
   "author": [
     {
       "@type": "Person",
       "name": "Torok, K.",
       "givenName": "K.",
       "familyName": "Torok"
     },
     {
       "@type": "Person",
       "name": "Belkin, H. E.",
       "givenName": "H. E.",
       "familyName": "Belkin",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0001-7879-6529",
         "url": "https://orcid.org/0000-0001-7879-6529"
       }
     },
     {
       "@type": "Person",
       "name": "de Vivo, B.",
       "givenName": "B.",
       "familyName": "de Vivo"
     },
     {
       "@type": "Person",
       "name": "Lima, A.",
       "givenName": "A.",
       "familyName": "Lima"
     }
   ]
 }

}