Matches in SemOpenAlex for { <https://semopenalex.org/work/W2055869476> ?p ?o ?g. }
Showing items 1 to 58 of
58
with 100 items per page.
- W2055869476 endingPage "295" @default.
- W2055869476 startingPage "295" @default.
- W2055869476 abstract "The Black Range, located in southwestern New Mexico on the margin of the Basin and Range physiographic province, consists mainly of Tertiary volcanic rocks, which include mafic, intermediate, and silicic lavas, and silicic ash-flow tuffs. This report treats the petrology of basalt, basaltic andesite, and andesite. Basaltic rocks are alkalic and fall into two groups — late Oligocene and Miocene, which are quartz normative and contain quartz inclusions, and Pliocene basalts, which are SiO 2 undersaturated and contain mafic and ultramafic inclusions. The andesite is Oligocene and Miocene in age and is potassic, having about 2.8 wt percent K 2 O at 60 wt percent SiO 2 ; Oligocene latite is also present and has about 4.0 wt percent K 2 O at 62 wt percent SiO 2 . The Oligocene rocks have lower alkali and higher MgO and CaO contents than the Miocene rocks. The total alkali, FeO, and MgO proportions (AFM) of the middle Tertiary suite of basalt-andesite are like those of calc-alkalic suites. Clinopyroxene and orthopyroxene coexisting in basaltic andesite and andesite also suggest that these rocks are calc-alkalic. Microprobe analyses show that average plagioclase compositions in the basalt and andesite are labradorite and that the high alkali contents of these rocks are manifested in the mode by interstitial alkali feldspar. Initial volcanism in early and middle Oligocene time was predominantly andesitic and was succeeded in late Oligocene and Miocene time by a suite of basalt, basaltic andesite, and andesite. On the basis of field relationships, the Oligocene andesite is interpreted as primary magmas, whereas younger andesite is differentiates of basaltic magma. Finally, only basaltic volcanism occurred in Pliocene time. The change in volcanism from intermediate to mafic is similar to the general trends of middle Cenozoic volcanism in the western United States. Compositional changes may have been related to physical changes in a subduction regime beneath New Mexico and progressive devolatilization." @default.
- W2055869476 created "2016-06-24" @default.
- W2055869476 creator A5047797179 @default.
- W2055869476 date "1975-01-01" @default.
- W2055869476 modified "2023-10-18" @default.
- W2055869476 title "Petrology of Basalt and Andesite of the Black Range, New Mexico" @default.
- W2055869476 doi "https://doi.org/10.1130/0016-7606(1975)86<295:pobaao>2.0.co;2" @default.
- W2055869476 hasPublicationYear "1975" @default.
- W2055869476 type Work @default.
- W2055869476 sameAs 2055869476 @default.
- W2055869476 citedByCount "8" @default.
- W2055869476 countsByYear W20558694762013 @default.
- W2055869476 countsByYear W20558694762015 @default.
- W2055869476 crossrefType "journal-article" @default.
- W2055869476 hasAuthorship W2055869476A5047797179 @default.
- W2055869476 hasConcept C120806208 @default.
- W2055869476 hasConcept C127313418 @default.
- W2055869476 hasConcept C159985019 @default.
- W2055869476 hasConcept C161509811 @default.
- W2055869476 hasConcept C17409809 @default.
- W2055869476 hasConcept C192241223 @default.
- W2055869476 hasConcept C192562407 @default.
- W2055869476 hasConcept C204323151 @default.
- W2055869476 hasConcept C2781323139 @default.
- W2055869476 hasConcept C36986328 @default.
- W2055869476 hasConcept C5900021 @default.
- W2055869476 hasConceptScore W2055869476C120806208 @default.
- W2055869476 hasConceptScore W2055869476C127313418 @default.
- W2055869476 hasConceptScore W2055869476C159985019 @default.
- W2055869476 hasConceptScore W2055869476C161509811 @default.
- W2055869476 hasConceptScore W2055869476C17409809 @default.
- W2055869476 hasConceptScore W2055869476C192241223 @default.
- W2055869476 hasConceptScore W2055869476C192562407 @default.
- W2055869476 hasConceptScore W2055869476C204323151 @default.
- W2055869476 hasConceptScore W2055869476C2781323139 @default.
- W2055869476 hasConceptScore W2055869476C36986328 @default.
- W2055869476 hasConceptScore W2055869476C5900021 @default.
- W2055869476 hasIssue "3" @default.
- W2055869476 hasLocation W20558694761 @default.
- W2055869476 hasOpenAccess W2055869476 @default.
- W2055869476 hasPrimaryLocation W20558694761 @default.
- W2055869476 hasRelatedWork W100561083 @default.
- W2055869476 hasRelatedWork W1675036353 @default.
- W2055869476 hasRelatedWork W2055014999 @default.
- W2055869476 hasRelatedWork W2071532815 @default.
- W2055869476 hasRelatedWork W2092965027 @default.
- W2055869476 hasRelatedWork W2153790443 @default.
- W2055869476 hasRelatedWork W2368297667 @default.
- W2055869476 hasRelatedWork W2393203504 @default.
- W2055869476 hasRelatedWork W378861944 @default.
- W2055869476 hasRelatedWork W4221128518 @default.
- W2055869476 hasVolume "86" @default.
- W2055869476 isParatext "false" @default.
- W2055869476 isRetracted "false" @default.
- W2055869476 magId "2055869476" @default.
- W2055869476 workType "article" @default.