{"@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/1360848660728040960.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1111/maps.12832"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12832"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12832"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Origin of <scp>EL</scp>3 chondrites: Evidence for variable C/O ratios during their course of formation—A state of the art scrutiny"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Mineral inventories of enstatite chondrites; (<jats:styled-content style=\"fixed-case\">EH</jats:styled-content> and <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>) are strictly dictated by combined parameters mainly very low dual oxygen (<jats:styled-content style=\"fixed-case\"><jats:italic>f</jats:italic>O</jats:styled-content><jats:sub>2</jats:sub>) and sulfur (<jats:styled-content style=\"fixed-case\"><jats:italic>f</jats:italic>S</jats:styled-content><jats:sub>2</jats:sub>) fugacities. They are best preserved in the Almahata Sitta <jats:styled-content style=\"fixed-case\">MS</jats:styled-content>‐17, <jats:styled-content style=\"fixed-case\">MS</jats:styled-content>‐177 fragments, and the <jats:styled-content style=\"fixed-case\">ALHA</jats:styled-content> 77295 and <jats:styled-content style=\"fixed-case\">MAC</jats:styled-content> 88136 Antarctic meteorites. These conditions induce a stark change of the geochemical behavior of nominally lithophile elements to chalcophile or even siderophile and changes in the elemental partitioning thus leading to formation of unusual mineral assemblages with high abundance of exotic sulfide species and enrichment in the metallic alloys, for example, silicides and phosphides. Origin and mode of formation of these exotic chondrites, and their parental source regions could be best scrutinized by multitask research experiments of the most primitive members covering mineralogical, petrological, cosmochemical, and indispensably short‐lived isotopic chronology. The magnitude of temperature and pressure prevailed during their formation in their source regions could eventually be reasonably estimated: pre‐ and postaccretionary could eventually be deduced. The dual low fugacities are regulated by the carbon to oxygen ratios estimated to be >0.83 and <1.03. These parameters not only induce unusual geochemical behavior of the elements inverting many nominally lithophile elements to chalcophile or even siderophile or anthracophile. Structure and mineral inventories in <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 and <jats:styled-content style=\"fixed-case\">EH</jats:styled-content>3 chondrites are fundamentally different. Yet <jats:styled-content style=\"fixed-case\">EH</jats:styled-content>3 and <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 members store crucial information relevant to eventual source regions and importantly possible variation in C/O ratio in the course of their evolution. <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 and <jats:styled-content style=\"fixed-case\">EH</jats:styled-content>3 chondrites contain trichotomous lithologies (1) chondrules and their fragments, (2) polygonal enstatite‐dominated objects, and (3) multiphase metal‐rich nodules. Mineralogical and cosmochemical inventories of lithologies in the same <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 indicate not only similarities (<jats:styled-content style=\"fixed-case\">REE</jats:styled-content> inventory and anomalies in oldhamite) but also distinct differences (sinoite‐enstatite‐graphite relationship). Oldhamite in chondrules and polygonal fragments in <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 depict negative Eu anomaly attesting a common cosmochemical source. Metal‐dominated nodules in both <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 and <jats:styled-content style=\"fixed-case\">EH</jats:styled-content>3 are conglomerates of metal clasts and sulfide fragments in <jats:styled-content style=\"fixed-case\">EH</jats:styled-content>3 and concentrically zoned C‐bearing metal micropebbles (≥25 μm ≤50 μm) in <jats:styled-content style=\"fixed-case\">EL</jats:styled-content>3 thus manifesting a frozen in unique primordial accretionary metal texture and composition. Sinoite‐enstatite‐diopside‐graphite textures reveal a nucleation and growth strongly suggestive of fluctuating C/O ratio during their nucleation and growth in the source regions. Mineral inventories, sulfide phase relations, sinoite‐enstatite‐graphite intergrowth, carbon and nitrogen isotopic compositions of graphite, spatial nitrogen abundance in graphite in metal nodules, and last but not least <jats:sup>129</jats:sup>I/<jats:sup>129</jats:sup>Xe and <jats:sup>53</jats:sup>Mn/<jats:sup>53</jats:sup>Cr systematics negate any previously suggested melting episode, pre‐accretionary or dynamic, in parental asteroids.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380576118714924934","@type":"Researcher","foaf:name":[{"@value":"A. El Goresy"}],"jpcoar:affiliationName":[{"@value":"Bayerisches Geoinstitut Universität Bayreuth Bayreuth 95447 Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1380848660728040832","@type":"Researcher","foaf:name":[{"@value":"Y. 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