Matches in SemOpenAlex for { <https://semopenalex.org/work/W50532024> ?p ?o ?g. }
Showing items 1 to 72 of
72
with 100 items per page.
- W50532024 abstract "The recent tectonic evolution of the Isthmus of Panama is marked by a complexity imparted by a subduction zone - magmatic arc, a transform plate boundary, and the attempted subduction of an aseismic ridge. In northern Panama andesites form the morphologically young Chiriqui stratovolcano, while in southern Costa Rica they are found interbedded with thick lahars. Two groups of andesites occur in the region. One is low in Si and K (Group I); the other high in Si and K (Group II). The Panamanian andesites belong to both the groups, while Costa Rican andesites are restricted to Group II. Group I andesites are glassy, plagioclase-phyric (An45 rims), and contain abundant augite (Wo46En46Fs8) and magnetite. Rare, resorbed olivine (Fo82) and amphibole are occasionally observed. The Group II andesites have similar mineralogy but also contain abundant pargasitic hornblende and minor orthopyroxene or pigeonite. Xenoliths are common in the Group II andesites of Chiriqui Volcano. Two types of xenoliths are recognized. Cumulate-textured, hornblende gabbro xenoliths vary from nearly pure plagioclase to nearly pure amphibole. These gabbroic xenoliths contain plagioclase (An90 cores to An53 rims), augite, and pargasitic hornblende often displaying the same reaction products as found in the andesites. These xenoliths are interpretedmore » as cognate. These andesites are all characterized by high alkalis and alkali earths; Group II have over 1500 ppm Ba and 1000 ppm Sr. They are apparently produced by partial melting of a highly metasomatised mantle followed by high-pressure fractionation dominated by hornblende.« less" @default.
- W50532024 created "2016-06-24" @default.
- W50532024 creator A5006591356 @default.
- W50532024 creator A5073294599 @default.
- W50532024 date "1985-01-01" @default.
- W50532024 modified "2023-09-27" @default.
- W50532024 title "Late Tertiary/Quaternary volcanics of southern Costa Rica and northern Panama" @default.
- W50532024 hasPublicationYear "1985" @default.
- W50532024 type Work @default.
- W50532024 sameAs 50532024 @default.
- W50532024 citedByCount "0" @default.
- W50532024 crossrefType "journal-article" @default.
- W50532024 hasAuthorship W50532024A5006591356 @default.
- W50532024 hasAuthorship W50532024A5073294599 @default.
- W50532024 hasConcept C120806208 @default.
- W50532024 hasConcept C127313418 @default.
- W50532024 hasConcept C151730666 @default.
- W50532024 hasConcept C161509811 @default.
- W50532024 hasConcept C17409809 @default.
- W50532024 hasConcept C192241223 @default.
- W50532024 hasConcept C2776283581 @default.
- W50532024 hasConcept C2777212541 @default.
- W50532024 hasConcept C2777229588 @default.
- W50532024 hasConcept C2779181077 @default.
- W50532024 hasConcept C2779321686 @default.
- W50532024 hasConcept C2779870107 @default.
- W50532024 hasConcept C36986328 @default.
- W50532024 hasConcept C42796848 @default.
- W50532024 hasConcept C4992710 @default.
- W50532024 hasConceptScore W50532024C120806208 @default.
- W50532024 hasConceptScore W50532024C127313418 @default.
- W50532024 hasConceptScore W50532024C151730666 @default.
- W50532024 hasConceptScore W50532024C161509811 @default.
- W50532024 hasConceptScore W50532024C17409809 @default.
- W50532024 hasConceptScore W50532024C192241223 @default.
- W50532024 hasConceptScore W50532024C2776283581 @default.
- W50532024 hasConceptScore W50532024C2777212541 @default.
- W50532024 hasConceptScore W50532024C2777229588 @default.
- W50532024 hasConceptScore W50532024C2779181077 @default.
- W50532024 hasConceptScore W50532024C2779321686 @default.
- W50532024 hasConceptScore W50532024C2779870107 @default.
- W50532024 hasConceptScore W50532024C36986328 @default.
- W50532024 hasConceptScore W50532024C42796848 @default.
- W50532024 hasConceptScore W50532024C4992710 @default.
- W50532024 hasLocation W505320241 @default.
- W50532024 hasOpenAccess W50532024 @default.
- W50532024 hasPrimaryLocation W505320241 @default.
- W50532024 hasRelatedWork W144973602 @default.
- W50532024 hasRelatedWork W1964321834 @default.
- W50532024 hasRelatedWork W1965787603 @default.
- W50532024 hasRelatedWork W1966809571 @default.
- W50532024 hasRelatedWork W1970353965 @default.
- W50532024 hasRelatedWork W2006264706 @default.
- W50532024 hasRelatedWork W2028446118 @default.
- W50532024 hasRelatedWork W2037359679 @default.
- W50532024 hasRelatedWork W2051630494 @default.
- W50532024 hasRelatedWork W2052893265 @default.
- W50532024 hasRelatedWork W2071532815 @default.
- W50532024 hasRelatedWork W2092503647 @default.
- W50532024 hasRelatedWork W2145164854 @default.
- W50532024 hasRelatedWork W2161948204 @default.
- W50532024 hasRelatedWork W2317046618 @default.
- W50532024 hasRelatedWork W2317978519 @default.
- W50532024 hasRelatedWork W2326695483 @default.
- W50532024 hasRelatedWork W3028524440 @default.
- W50532024 hasRelatedWork W3195898450 @default.
- W50532024 hasRelatedWork W2182162600 @default.
- W50532024 hasVolume "17" @default.
- W50532024 isParatext "false" @default.
- W50532024 isRetracted "false" @default.
- W50532024 magId "50532024" @default.
- W50532024 workType "article" @default.