FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2100458545> ?p ?o ?g. }

• W2100458545 endingPage "200" @default.
• W2100458545 startingPage "185" @default.
• W2100458545 abstract "A paleomagnetic, geochronologic and petrographic study was undertaken on the flat-lying gabbros and basalts of the Nova Floresta Formation of Rondônia state, western Brazil in order to constrain the Mesoproterozoic paleogeography of the Amazon craton. Measurement of the anisotropy of magnetic susceptibility on the gabbroic samples reveals a flat-lying foliation with a radiating pattern of lineations, supporting the field evidence that the gabbros are part of a large, undeformed sill. Petrographic observations of oxides in the gabbros reveals two populations of magnetite grains produced during the original cooling of the sill: large, oxyexsolved titanomagnetite grains and fine-grained magnetite in igneous reaction rims. New 40Ar/39Ar age dating of biotite and plagioclase yield ages of ∼1.2 Ga, which represent the rapid cooling following emplacement of the mafic magma. Whole rock dating of basalt samples yields total gas ages of 1062±3 Ma, similar to the ∼1.0 Ga K/Ar ages reported by previous workers. However, the strong compositional dependence of the age spectrum renders this younger whole rock age unreliable except as a minimum constraint. A single magnetic component is found in the basalts, indistinguishable from the characteristic remanence found in the gabbros that is oriented WNW and steeply upward. This magnetization is considered to be primary and was acquired during the cooling of the sill and associated lavas. A paleomagnetic pole calculated from the Nova Floresta Formation (n=16 sites, Plat.=24.6°N, Plong.=164.6°E, A95=5.5°, Q=5), the first reported pole for the Amazon craton for the 1200–600 Ma Rodinia time period, constrains the paleogeographic position of Amazonia at ∼1.2 Ga. Juxtaposition of the western Amazon craton with the Llano segment of the Laurentia’s Grenville margin causes the NF pole to lie on the 1.2 Ga portion of the combined APWP for Laurentia and Greenland, which indicates that a collision with the Amazon craton could have caused the Llano deformation in early Grenvillian times." @default.
• W2100458545 created "2016-06-24" @default.
• W2100458545 creator A5013218080 @default.
• W2100458545 creator A5018060646 @default.
• W2100458545 creator A5023437828 @default.
• W2100458545 creator A5053042095 @default.
• W2100458545 creator A5082393508 @default.
• W2100458545 date "2002-05-01" @default.
• W2100458545 modified "2023-10-04" @default.
• W2100458545 title "Paleogeography of the Amazon craton at 1.2 Ga: early Grenvillian collision with the Llano segment of Laurentia" @default.
• W2100458545 cites W1538928648 @default.
• W2100458545 cites W1967556089 @default.
• W2100458545 cites W1969447332 @default.
• W2100458545 cites W1970506792 @default.
• W2100458545 cites W1971717428 @default.
• W2100458545 cites W1972028040 @default.
• W2100458545 cites W1974822623 @default.
• W2100458545 cites W1976176695 @default.
• W2100458545 cites W1978488084 @default.
• W2100458545 cites W1980655250 @default.
• W2100458545 cites W1981291934 @default.
• W2100458545 cites W1984171103 @default.
• W2100458545 cites W1985152238 @default.
• W2100458545 cites W1990011803 @default.
• W2100458545 cites W1992477950 @default.
• W2100458545 cites W1996999479 @default.
• W2100458545 cites W1997759594 @default.
• W2100458545 cites W1999357276 @default.
• W2100458545 cites W2000742544 @default.
• W2100458545 cites W2019568994 @default.
• W2100458545 cites W2020846112 @default.
• W2100458545 cites W2022928215 @default.
• W2100458545 cites W2026387367 @default.
• W2100458545 cites W2027435075 @default.
• W2100458545 cites W2030301063 @default.
• W2100458545 cites W2034953607 @default.
• W2100458545 cites W2038974519 @default.
• W2100458545 cites W2043335427 @default.
• W2100458545 cites W2045869753 @default.
• W2100458545 cites W2046213887 @default.
• W2100458545 cites W2047661287 @default.
• W2100458545 cites W2050120676 @default.
• W2100458545 cites W2050479429 @default.
• W2100458545 cites W2051523407 @default.
• W2100458545 cites W2060420014 @default.
• W2100458545 cites W2062269121 @default.
• W2100458545 cites W2066534219 @default.
• W2100458545 cites W2073782058 @default.
• W2100458545 cites W2073978413 @default.
• W2100458545 cites W2079291505 @default.
• W2100458545 cites W2080205187 @default.
• W2100458545 cites W2083177141 @default.
• W2100458545 cites W2083263448 @default.
• W2100458545 cites W2088091813 @default.
• W2100458545 cites W2090286472 @default.
• W2100458545 cites W2094014279 @default.
• W2100458545 cites W2106510756 @default.
• W2100458545 cites W2106788916 @default.
• W2100458545 cites W2118115231 @default.
• W2100458545 cites W2118204502 @default.
• W2100458545 cites W2125465308 @default.
• W2100458545 cites W2134070608 @default.
• W2100458545 cites W2135844641 @default.
• W2100458545 cites W2148855279 @default.
• W2100458545 cites W2149629144 @default.
• W2100458545 cites W2150572861 @default.
• W2100458545 cites W2152072685 @default.
• W2100458545 cites W2161535824 @default.
• W2100458545 cites W2195162144 @default.
• W2100458545 cites W229595922 @default.
• W2100458545 cites W2396396268 @default.
• W2100458545 cites W2478739845 @default.
• W2100458545 cites W2909925610 @default.
• W2100458545 doi "https://doi.org/10.1016/s0012-821x(02)00561-7" @default.
• W2100458545 hasPublicationYear "2002" @default.
• W2100458545 type Work @default.
• W2100458545 sameAs 2100458545 @default.
• W2100458545 citedByCount "171" @default.
• W2100458545 countsByYear W21004585452012 @default.
• W2100458545 countsByYear W21004585452013 @default.
• W2100458545 countsByYear W21004585452014 @default.
• W2100458545 countsByYear W21004585452015 @default.
• W2100458545 countsByYear W21004585452016 @default.
• W2100458545 countsByYear W21004585452017 @default.
• W2100458545 countsByYear W21004585452018 @default.
• W2100458545 countsByYear W21004585452019 @default.
• W2100458545 countsByYear W21004585452020 @default.
• W2100458545 countsByYear W21004585452021 @default.
• W2100458545 countsByYear W21004585452022 @default.
• W2100458545 countsByYear W21004585452023 @default.
• W2100458545 crossrefType "journal-article" @default.
• W2100458545 hasAuthorship W2100458545A5013218080 @default.
• W2100458545 hasAuthorship W2100458545A5018060646 @default.
• W2100458545 hasAuthorship W2100458545A5023437828 @default.
• W2100458545 hasAuthorship W2100458545A5053042095 @default.
• W2100458545 hasAuthorship W2100458545A5082393508 @default.
• W2100458545 hasConcept C120806208 @default.
• W2100458545 hasConcept C127313418 @default.

• next