Matches in SemOpenAlex for { <https://semopenalex.org/work/W4283811773> ?p ?o ?g. }
- W4283811773 endingPage "103909" @default.
- W4283811773 startingPage "103909" @default.
- W4283811773 abstract "Bioapatite of fossil bone and teeth is susceptible to alteration and ion exchange during burial and diagenesis , varying its Sr content through the geological time . Nevertheless, fossil shark teeth are a powerful proxy for both chronostratigraphic and paleoecological reconstructions, thanks to the presence of the enameloid, a hard outer layer consisting of resistant fluorapatite crystallites . Here, we analyze fossil shark teeth from the Miocene sediments of the Chilcatay Formation of the Pisco Basin (southwestern Peru) with the aim of dating poorly constrained strata in this region. (Ultra)structural and compositional analyses of fossil lamniform and carcharhiniform teeth are performed through macroscopical observations, optical microscopy and SEM-EDS for evaluating the preservation state of the collected teeth. Shark teeth display a compact and well preserved outer enameloid layer formed by highly ordered bundles of crystallites that is distinctly separated by a more porous and heterogeneous inner core of dentine featuring diagenetic artefacts and microborings. Compositional mapping highlights differences in the distribution of Ca, P, F, and S in the enameloid and dentine, and chemical results show a Sr content that is consistent with the range reported for extant shark teeth. The best preserved teeth were selected for Strontium Isotope Stratigraphy (SIS), measuring the 87 Sr/ 86 Sr values in the enameloid and obtaining numerical (absolute) age estimates. In the Ica River Valley, SIS dates the Chilcatay strata to the Burdigalian (between 19.1 and 18.1 Ma), in agreement with previous radiometric, isotopic and biostratigraphic ages obtained in the same region. At Media Luna , the Chilcatay strata are dated herein for the first time, resulting in a slightly older age of 21.8–20.1 Ma (late Aquitanian–early Burdigalian). These results strengthen the notion that the Sr-ratio of shark teeth can be successfully applied for obtaining reliable age estimates via SIS. • Enameloid of fossil shark teeth is more resistant to alteration than dentine. • We achieve ultrastructural and compositional data on Miocene Peruvian shark teeth. • Good preservation of the enameloid allows for successful Sr isotope dating. • 87 Sr/ 86 Sr values date the Chilcatay strata to the Burdigalian in the Ica River Valley. • Chilcatay strata at Media Luna are dated for the first time to ca. 22–20 Ma." @default.
- W4283811773 created "2022-07-06" @default.
- W4283811773 creator A5006165908 @default.
- W4283811773 creator A5007788890 @default.
- W4283811773 creator A5026372980 @default.
- W4283811773 creator A5031662329 @default.
- W4283811773 creator A5048862060 @default.
- W4283811773 creator A5079064522 @default.
- W4283811773 date "2022-10-01" @default.
- W4283811773 modified "2023-09-24" @default.
- W4283811773 title "Ultrastructure, composition, and 87Sr/86Sr dating of shark teeth from lower Miocene sediments of southwestern Peru" @default.
- W4283811773 cites W1045727849 @default.
- W4283811773 cites W129880262 @default.
- W4283811773 cites W1522584224 @default.
- W4283811773 cites W1549978530 @default.
- W4283811773 cites W1915825516 @default.
- W4283811773 cites W1920811083 @default.
- W4283811773 cites W1964256293 @default.
- W4283811773 cites W1964722407 @default.
- W4283811773 cites W1967245491 @default.
- W4283811773 cites W1967945080 @default.
- W4283811773 cites W1969352167 @default.
- W4283811773 cites W1970692209 @default.
- W4283811773 cites W1971953511 @default.
- W4283811773 cites W1972758635 @default.
- W4283811773 cites W1973677847 @default.
- W4283811773 cites W1975199422 @default.
- W4283811773 cites W1975681870 @default.
- W4283811773 cites W1976620802 @default.
- W4283811773 cites W1977055850 @default.
- W4283811773 cites W1978947656 @default.
- W4283811773 cites W1982358531 @default.
- W4283811773 cites W1985695654 @default.
- W4283811773 cites W1992629905 @default.
- W4283811773 cites W1996087648 @default.
- W4283811773 cites W1996693681 @default.
- W4283811773 cites W2000412707 @default.
- W4283811773 cites W2000581211 @default.
- W4283811773 cites W2002864668 @default.
- W4283811773 cites W2006979454 @default.
- W4283811773 cites W2009152115 @default.
- W4283811773 cites W2014392338 @default.
- W4283811773 cites W2015254230 @default.
- W4283811773 cites W2023677094 @default.
- W4283811773 cites W2024525605 @default.
- W4283811773 cites W2026471384 @default.
- W4283811773 cites W2029910349 @default.
- W4283811773 cites W2033916529 @default.
- W4283811773 cites W2035335976 @default.
- W4283811773 cites W2035719523 @default.
- W4283811773 cites W2036227390 @default.
- W4283811773 cites W2039491317 @default.
- W4283811773 cites W2045693947 @default.
- W4283811773 cites W2049451563 @default.
- W4283811773 cites W2054833961 @default.
- W4283811773 cites W2055311296 @default.
- W4283811773 cites W2065549546 @default.
- W4283811773 cites W2067760647 @default.
- W4283811773 cites W2075275932 @default.
- W4283811773 cites W2081526427 @default.
- W4283811773 cites W2088446422 @default.
- W4283811773 cites W2091950619 @default.
- W4283811773 cites W2094877364 @default.
- W4283811773 cites W2100744802 @default.
- W4283811773 cites W2115874504 @default.
- W4283811773 cites W2118081486 @default.
- W4283811773 cites W2119216255 @default.
- W4283811773 cites W2135277589 @default.
- W4283811773 cites W2135976972 @default.
- W4283811773 cites W2139549940 @default.
- W4283811773 cites W2143510127 @default.
- W4283811773 cites W2155789026 @default.
- W4283811773 cites W2160022939 @default.
- W4283811773 cites W2160605512 @default.
- W4283811773 cites W2162277992 @default.
- W4283811773 cites W2168843365 @default.
- W4283811773 cites W2257435804 @default.
- W4283811773 cites W2313383114 @default.
- W4283811773 cites W2464886511 @default.
- W4283811773 cites W2478166574 @default.
- W4283811773 cites W2517153088 @default.
- W4283811773 cites W2517337867 @default.
- W4283811773 cites W2528849898 @default.
- W4283811773 cites W2535161420 @default.
- W4283811773 cites W2563053490 @default.
- W4283811773 cites W2605682399 @default.
- W4283811773 cites W2735289773 @default.
- W4283811773 cites W2754031179 @default.
- W4283811773 cites W2768335441 @default.
- W4283811773 cites W2793543729 @default.
- W4283811773 cites W2800268595 @default.
- W4283811773 cites W2805396736 @default.
- W4283811773 cites W2885846326 @default.
- W4283811773 cites W2887078221 @default.
- W4283811773 cites W2889379466 @default.
- W4283811773 cites W2896313305 @default.
- W4283811773 cites W2912537880 @default.
- W4283811773 cites W2913045721 @default.