Matches in SemOpenAlex for { <https://semopenalex.org/work/W2009418775> ?p ?o ?g. }
Showing items 1 to 81 of
81
with 100 items per page.
- W2009418775 endingPage "218" @default.
- W2009418775 startingPage "203" @default.
- W2009418775 abstract "The Amazcala caldera is located 30 km NE of Querétaro City, near Amazcala, state of Querétaro. This caldera is the northernmost caldera within the central sector of the Mexican Volcanic Belt (MVB). It has a 11×14 km2 elliptical shape, and was formed 7.3–6.6 Ma ago. All caldera products are rhyolites. The oldest caldera unit, the Ezequiel Montes pumice (EMP), is a widespread pumice fallout emplaced around 7.3 Ma ago. An isopach map of the EMP shows two dispersal axes, oriented to the SW and SE with respect to the caldera. The EMP is 5 m thick 40 km to the SW and 35 km to the SE of the caldera. An isopleth map of the EMP shows that pumice fragments increase in size toward the caldera, from 1 cm at 40 km to 25 cm near the caldera rim. The EMP is a regional stratigraphic marker. The Colón ignimbrite, dated at 7.3±0.5 Ma, is stratigraphically above the EMP. It consists of several ash-flow units interbedded with minor pumice fall lapilli and ash, with a minimum thickness of about 80 m at Colón. The caldera rim is occupied by several rhyolite lava domes and flows, some of which extend 10 km from the rim. These domes contain parts of fresh, aphyric obsidian. The last caldera event is an intracaldera rhyolitic dome near the NE rim at about 6.6 Ma. The dome is 4×2 km2 and is elongated in the NE direction. The Amazcala caldera is 480 km from the Middle America Trench and represents the farthest inland caldera in the central sector of the MVB. Its age of 7.3–6.6 Ma indicates that it is the oldest caldera of the MVB so far reported. This confirms the general view that the volcanic activity of the MVB initiated at its northern margin, and then migrated southward in time." @default.
- W2009418775 created "2016-06-24" @default.
- W2009418775 creator A5004381189 @default.
- W2009418775 creator A5011591253 @default.
- W2009418775 date "2001-11-01" @default.
- W2009418775 modified "2023-10-18" @default.
- W2009418775 title "The Amazcala caldera, Queretaro, Mexico. Geology and geochronology" @default.
- W2009418775 cites W2041348481 @default.
- W2009418775 cites W2051299687 @default.
- W2009418775 cites W2063780264 @default.
- W2009418775 cites W2075220114 @default.
- W2009418775 cites W2078418919 @default.
- W2009418775 cites W2079436266 @default.
- W2009418775 cites W2083966746 @default.
- W2009418775 cites W2145604970 @default.
- W2009418775 cites W2157099954 @default.
- W2009418775 doi "https://doi.org/10.1016/s0377-0273(01)00227-x" @default.
- W2009418775 hasPublicationYear "2001" @default.
- W2009418775 type Work @default.
- W2009418775 sameAs 2009418775 @default.
- W2009418775 citedByCount "33" @default.
- W2009418775 countsByYear W20094187752012 @default.
- W2009418775 countsByYear W20094187752013 @default.
- W2009418775 countsByYear W20094187752014 @default.
- W2009418775 countsByYear W20094187752015 @default.
- W2009418775 countsByYear W20094187752016 @default.
- W2009418775 countsByYear W20094187752018 @default.
- W2009418775 countsByYear W20094187752019 @default.
- W2009418775 countsByYear W20094187752020 @default.
- W2009418775 countsByYear W20094187752021 @default.
- W2009418775 countsByYear W20094187752022 @default.
- W2009418775 crossrefType "journal-article" @default.
- W2009418775 hasAuthorship W2009418775A5004381189 @default.
- W2009418775 hasAuthorship W2009418775A5011591253 @default.
- W2009418775 hasConcept C113754120 @default.
- W2009418775 hasConcept C114793014 @default.
- W2009418775 hasConcept C120806208 @default.
- W2009418775 hasConcept C125910819 @default.
- W2009418775 hasConcept C127313418 @default.
- W2009418775 hasConcept C165205528 @default.
- W2009418775 hasConcept C17409809 @default.
- W2009418775 hasConcept C189092281 @default.
- W2009418775 hasConcept C192241223 @default.
- W2009418775 hasConcept C25822816 @default.
- W2009418775 hasConcept C49708893 @default.
- W2009418775 hasConcept C75268469 @default.
- W2009418775 hasConcept C95869378 @default.
- W2009418775 hasConceptScore W2009418775C113754120 @default.
- W2009418775 hasConceptScore W2009418775C114793014 @default.
- W2009418775 hasConceptScore W2009418775C120806208 @default.
- W2009418775 hasConceptScore W2009418775C125910819 @default.
- W2009418775 hasConceptScore W2009418775C127313418 @default.
- W2009418775 hasConceptScore W2009418775C165205528 @default.
- W2009418775 hasConceptScore W2009418775C17409809 @default.
- W2009418775 hasConceptScore W2009418775C189092281 @default.
- W2009418775 hasConceptScore W2009418775C192241223 @default.
- W2009418775 hasConceptScore W2009418775C25822816 @default.
- W2009418775 hasConceptScore W2009418775C49708893 @default.
- W2009418775 hasConceptScore W2009418775C75268469 @default.
- W2009418775 hasConceptScore W2009418775C95869378 @default.
- W2009418775 hasIssue "1-4" @default.
- W2009418775 hasLocation W20094187751 @default.
- W2009418775 hasOpenAccess W2009418775 @default.
- W2009418775 hasPrimaryLocation W20094187751 @default.
- W2009418775 hasRelatedWork W1994296170 @default.
- W2009418775 hasRelatedWork W2005554930 @default.
- W2009418775 hasRelatedWork W2009418775 @default.
- W2009418775 hasRelatedWork W2020997796 @default.
- W2009418775 hasRelatedWork W2061213422 @default.
- W2009418775 hasRelatedWork W2065284401 @default.
- W2009418775 hasRelatedWork W2318537203 @default.
- W2009418775 hasRelatedWork W2370314391 @default.
- W2009418775 hasRelatedWork W3199043618 @default.
- W2009418775 hasRelatedWork W321841980 @default.
- W2009418775 hasVolume "111" @default.
- W2009418775 isParatext "false" @default.
- W2009418775 isRetracted "false" @default.
- W2009418775 magId "2009418775" @default.
- W2009418775 workType "article" @default.