Matches in SemOpenAlex for { <https://semopenalex.org/work/W235990908> ?p ?o ?g. }
Showing items 1 to 81 of
81
with 100 items per page.
- W235990908 abstract "Pleistocene volcanic centers in NW Spitsbergen, Norway host one of the world's richest occurrences of mantle xenoliths. The xenoliths comprise varieties of spinel lherzolites and pyroxenites. Some of these xenoliths (and their host basalts) contain 10-100 micrometer globules of ankedtic-magnesitic carbonates (AMC). In composition, mineralogy and petrology the AMC globules from Spitsbergen are strikingly similar to the carbonate globules in ALH84001. The AMC globules occur within interstitial quenched glass and as fracture fillings, although we have not seen replacement fabrics analogous to carbonate rosettes replacing glass in ALH84001. Siderite/ankerite forms the core of these concentrically zoned globules while rims are predominantly magnesite. Clay minerals can occasionally be found within and around the globules. Aside from the clay minerals, the principal mineralogical difference between the AMCs and the ALH84001 carbonate rosettes is the presence of concentrated zones of nanophase magnetite in the rosettes, notably absent in the AMCs. However, carbonate globules containing nanophase magnetite have been produced inorganically by hydrothermal precipitation of carbonates and subsequent heating. We heated Spitsbergen AMC at 585 C in a reducing atmosphere to determine whether magnetite could be produced. Optical micrographs of the heated Spitsbergen AMC show dark concentric zones within the AMC. High resolution SEM images of those areas reveal 150-200 nm euhedral crystals that exhibit various morphologies including octahedra and elongated prisms. EDS analyses of areas where the crystals occur contain Fe, O, and minor Si, and P. However, the probe integrates over volumes of material, which also include the surrounding matrix. We have begun TEM observations of both the heated and unheated Spitsbergen AMC to characterize the microstructures of the carbonates, establish the presence/absence of magnetite and determine the relationship of the clay minerals to the carbonates and host rock." @default.
- W235990908 created "2016-06-24" @default.
- W235990908 creator A5008993006 @default.
- W235990908 creator A5033208362 @default.
- W235990908 creator A5040641316 @default.
- W235990908 creator A5048845214 @default.
- W235990908 creator A5076201755 @default.
- W235990908 creator A5091194549 @default.
- W235990908 date "2001-01-01" @default.
- W235990908 modified "2023-09-25" @default.
- W235990908 title "Carbonate Globules from Spitsbergen, Norway: Terrestrial Analogs of the Carbonates in Martian Meteorite ALH84001?" @default.
- W235990908 hasPublicationYear "2001" @default.
- W235990908 type Work @default.
- W235990908 sameAs 235990908 @default.
- W235990908 citedByCount "0" @default.
- W235990908 crossrefType "journal-article" @default.
- W235990908 hasAuthorship W235990908A5008993006 @default.
- W235990908 hasAuthorship W235990908A5033208362 @default.
- W235990908 hasAuthorship W235990908A5040641316 @default.
- W235990908 hasAuthorship W235990908A5048845214 @default.
- W235990908 hasAuthorship W235990908A5076201755 @default.
- W235990908 hasAuthorship W235990908A5091194549 @default.
- W235990908 hasConcept C121332964 @default.
- W235990908 hasConcept C127313418 @default.
- W235990908 hasConcept C130635790 @default.
- W235990908 hasConcept C151730666 @default.
- W235990908 hasConcept C161509811 @default.
- W235990908 hasConcept C17409809 @default.
- W235990908 hasConcept C191897082 @default.
- W235990908 hasConcept C192562407 @default.
- W235990908 hasConcept C199289684 @default.
- W235990908 hasConcept C2777781897 @default.
- W235990908 hasConcept C2778572594 @default.
- W235990908 hasConcept C2779002002 @default.
- W235990908 hasConcept C2779086746 @default.
- W235990908 hasConcept C2780191791 @default.
- W235990908 hasConcept C2780659211 @default.
- W235990908 hasConcept C42796848 @default.
- W235990908 hasConcept C87355193 @default.
- W235990908 hasConceptScore W235990908C121332964 @default.
- W235990908 hasConceptScore W235990908C127313418 @default.
- W235990908 hasConceptScore W235990908C130635790 @default.
- W235990908 hasConceptScore W235990908C151730666 @default.
- W235990908 hasConceptScore W235990908C161509811 @default.
- W235990908 hasConceptScore W235990908C17409809 @default.
- W235990908 hasConceptScore W235990908C191897082 @default.
- W235990908 hasConceptScore W235990908C192562407 @default.
- W235990908 hasConceptScore W235990908C199289684 @default.
- W235990908 hasConceptScore W235990908C2777781897 @default.
- W235990908 hasConceptScore W235990908C2778572594 @default.
- W235990908 hasConceptScore W235990908C2779002002 @default.
- W235990908 hasConceptScore W235990908C2779086746 @default.
- W235990908 hasConceptScore W235990908C2780191791 @default.
- W235990908 hasConceptScore W235990908C2780659211 @default.
- W235990908 hasConceptScore W235990908C42796848 @default.
- W235990908 hasConceptScore W235990908C87355193 @default.
- W235990908 hasOpenAccess W235990908 @default.
- W235990908 hasRelatedWork W1554536313 @default.
- W235990908 hasRelatedWork W1654626428 @default.
- W235990908 hasRelatedWork W1949209567 @default.
- W235990908 hasRelatedWork W1964266156 @default.
- W235990908 hasRelatedWork W1968766216 @default.
- W235990908 hasRelatedWork W1981962180 @default.
- W235990908 hasRelatedWork W1988579015 @default.
- W235990908 hasRelatedWork W1993050214 @default.
- W235990908 hasRelatedWork W2005934521 @default.
- W235990908 hasRelatedWork W2017447046 @default.
- W235990908 hasRelatedWork W203224191 @default.
- W235990908 hasRelatedWork W2036236368 @default.
- W235990908 hasRelatedWork W2053287957 @default.
- W235990908 hasRelatedWork W2061192301 @default.
- W235990908 hasRelatedWork W2074804179 @default.
- W235990908 hasRelatedWork W2098315433 @default.
- W235990908 hasRelatedWork W2108601485 @default.
- W235990908 hasRelatedWork W2324588484 @default.
- W235990908 hasRelatedWork W2974140978 @default.
- W235990908 hasRelatedWork W67267944 @default.
- W235990908 isParatext "false" @default.
- W235990908 isRetracted "false" @default.
- W235990908 magId "235990908" @default.
- W235990908 workType "article" @default.