Modern stream sands from compound crystalline sources: Coniposition and sand generation index

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dc.book.titleProcesses controlling the composition of clastic sediments
dc.contributor.authorPalomares Herranz, Marta
dc.contributor.authorArribas Mocoroa, José
dc.date.accessioned2023-06-20T21:13:39Z
dc.date.available2023-06-20T21:13:39Z
dc.date.issued1993
dc.description.abstractCompositions of modern first-cycle sands derived from granitic and metamorphic terrains in the Spanish Central System have been analyzed in order to evaluate the contributions of different bedrock types. The results of this work indicate that sand composition normally does not permit quantitative statements concerning sourceland composition. This is due to the fact that each rock type has a different potential to generate sand, dependent on such properties as its mineralogy, average crystal size, and microfabric. We introduce the concept of sand generation index (SGI), which is a relative measure of the capacity of one bedrock type to generate sand with respect to another in a compound source area. SGI of granitoid is 14 to 20 times greater than SGI of slate-schist when these rock types appear in a dual crystalline source. In the case of a gneiss + slate-schist source rock association, the SGI of gneiss is about five times greater than the SGI of slate-schist, whereas the SGI of gneiss is similar to that of granitoid in case of a dual granitoid + gneiss source. Finally, our results show that quantitative estimates of source land composition based on QFR diagrams are hazardous if the concept of the SGI is disregarded.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/43218
dc.identifier.doi10.1130/SPE284
dc.identifier.isbn0-8137-2284-5
dc.identifier.issn0-8137-2284-5
dc.identifier.officialurlhttps://pubs.geoscienceworld.org/books/book/424/chapter/3798488/Modern-stream-sands-from-compound-crystalline
dc.identifier.relatedurlhttp:/www.geosociety.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/61002
dc.journal.titleGeological Society of America
dc.language.isoeng
dc.page.final322
dc.page.initial313
dc.page.total342
dc.publication.placeNew York
dc.publisherGeological Society of America
dc.relation.ispartofseriesGSA Special Papers
dc.rights.accessRightsopen access
dc.subject.cdu552.1
dc.subject.keywordRocas
dc.subject.keywordSedimentación
dc.subject.ucmPetrología
dc.titleModern stream sands from compound crystalline sources: Coniposition and sand generation index
dc.typebook part
dc.volume.number284
dspace.entity.typePublication
relation.isAuthorOfPublication6da5c68f-0c70-4bf8-a9f9-d0988e828f39
relation.isAuthorOfPublication.latestForDiscovery6da5c68f-0c70-4bf8-a9f9-d0988e828f39
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