{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361137046024569728.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2002je002013"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2002JE002013"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2002JE002013"}}],"dc:title":[{"@value":"Hansteen Alpha: A volcanic construct in the lunar highlands"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>We have used data from the Clementine and Lunar Prospector spacecraft in conjunction with near‐IR reflectance spectra collected with Earth‐based telescopes to study the composition and origin of Hansteen Alpha, an arrowhead‐shaped highlands feature located on the southern margin of Oceanus Procellarum. Hansteen Alpha is a member of a class of lunar spectral anomalies (Red Spots) that are characterized by a relatively high albedo and a strong absorption in the UV. It has been suggested that at least some of these spectral anomalies were produced by nonmare volcanism. The stratigraphic relationships among the geologic and compositional units in the region show that Hansteen Alpha was emplaced by extrusive igneous processes. The Imbrian‐aged craters Hansteen and Billy emplaced relatively FeO‐ and TiO<jats:sub>2</jats:sub>‐rich ejecta. Hansteen Alpha exhibits much lower FeO and TiO<jats:sub>2</jats:sub> values. If Hansteen Alpha was present prior to the Billy and Hansteen impact events, it should have been covered with FeO‐ and TiO<jats:sub>2</jats:sub>‐rich ejecta because it is located within one crater diameter of the rim crest of each crater. Since it is not, Hansteen Alpha was superposed on these ejecta units. Nonmare volcanism is the only viable process for the formation of Hansteen Alpha. The morphology and surface texture of Hansteen Alpha is similar to many terrestrial features of dacitic and rhyolitic composition formed by extrusions of relatively viscous lavas. Such highly evolved compositions should be very enriched in Th, but Hansteen Alpha exhibits Th abundances of ∼6 ppm. Hence Hansteen Alpha is not composed of a highly evolved highlands lithology.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381137046024569728","@type":"Researcher","foaf:name":[{"@value":"B. Ray Hawke"}],"jpcoar:affiliationName":[{"@value":"Hawaii Institute of Geophysics and Planetology University of Hawaii  Honolulu Hawaii USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016869964124163","@type":"Researcher","foaf:name":[{"@value":"D. J. Lawrence"}],"jpcoar:affiliationName":[{"@value":"Los Alamos National Laboratory  Los Alamos New Mexico USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016869964124162","@type":"Researcher","foaf:name":[{"@value":"D. T. Blewett"}],"jpcoar:affiliationName":[{"@value":"NovaSol  Honolulu Hawaii USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016869964124160","@type":"Researcher","foaf:name":[{"@value":"P. G. Lucey"}],"jpcoar:affiliationName":[{"@value":"Hawaii Institute of Geophysics and Planetology University of Hawaii  Honolulu Hawaii USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016869964124165","@type":"Researcher","foaf:name":[{"@value":"G. A. Smith"}],"jpcoar:affiliationName":[{"@value":"Hawaii Institute of Geophysics and Planetology University of Hawaii  Honolulu Hawaii USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016869964124161","@type":"Researcher","foaf:name":[{"@value":"P. D. Spudis"}],"jpcoar:affiliationName":[{"@value":"Johns Hopkins University Applied Physics Laboratory  Laurel Maryland USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016869964124164","@type":"Researcher","foaf:name":[{"@value":"G. J. Taylor"}],"jpcoar:affiliationName":[{"@value":"Hawaii Institute of Geophysics and Planetology University of Hawaii  Honolulu Hawaii USA"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Planets"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2003-07","prism:volume":"108","prism:number":"E7","prism:startingPage":"5069"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2002JE002013"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2002JE002013"}],"createdAt":"2003-07-10","modifiedAt":"2023-10-14","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/2051151842047696896","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2002je002013"},{"@type":"CROSSREF","@value":"10.1186/s40645-020-0324-8_references_DOI_78VMW9m9Tf3n7nJJ569uvVtg2TO"}]}