%0 Journal Article %1 WOS:000362628600081 %A Oliveira, Naiara C %A Silva, Joao H %A Barros, Olga A %A Pinheiro, Allysson P %A Santana, William %A Saraiva, Antonio A F %A Ferreira, Odair P %A Freire, Paulo T C %A Paula, Amauri J. %C 1155 16TH ST, NW, WASHINGTON, DC 20036 USA %D 2015 %I AMER CHEMICAL SOC %J ANALYTICAL CHEMISTRY %K imported %N 19 %P 10088-10095 %R 10.1021/acs.analchem.5b02815 %T Large-Field Electron Imaging and X-ray Elemental Mapping Unveil the Morphology, Structure, and Fractal Features of a Cretaceous Fossil at the Centimeter Scale %V 87 %X We used here a scanning electron microscopy approach that detected backscattered electrons (BSEs) and Xrays (from ionization processes) along a large-field (LF) scan, applied on a Cretaceous fossil of a shrimp (area similar to 280 mm(2)) from the Araripe Sedimentary Basin. High-definition LF images from BSEs and X-rays were essentially generated by assembling thousands of magnified images that covered the whole area of the fossil, thus unveiling morphological and compositional aspects at length scales from micrometers to centimeters. Morphological features of the shrimp such as pleopods, pereopods, and antennae located at near-surface layers (undetected by photography techniques) were unveiled in detail by LF BSE images and in calcium and phosphorus elemental maps (mineralized as hydroxyapatite). LF elemental maps for zinc and sulfur indicated a rare fossilization event observed for the first time in fossils from the Araripe Sedimentary Basin: the mineralization of zinc sulfide interfacing to hydroxyapatite in the fossil. Finally, a dimensional analysis of the phosphorus map led to an important finding: the existence of a fractal characteristic (D = 1.63) for the hydroxyapatite-matrix interface, a result of physical-geological events occurring with spatial scale invariance on the specimen, over millions of years.

@article{WOS:000362628600081, abstract = {We used here a scanning electron microscopy approach that detected backscattered electrons (BSEs) and Xrays (from ionization processes) along a large-field (LF) scan, applied on a Cretaceous fossil of a shrimp (area similar to 280 mm(2)) from the Araripe Sedimentary Basin. High-definition LF images from BSEs and X-rays were essentially generated by assembling thousands of magnified images that covered the whole area of the fossil, thus unveiling morphological and compositional aspects at length scales from micrometers to centimeters. Morphological features of the shrimp such as pleopods, pereopods, and antennae located at near-surface layers (undetected by photography techniques) were unveiled in detail by LF BSE images and in calcium and phosphorus elemental maps (mineralized as hydroxyapatite). LF elemental maps for zinc and sulfur indicated a rare fossilization event observed for the first time in fossils from the Araripe Sedimentary Basin: the mineralization of zinc sulfide interfacing to hydroxyapatite in the fossil. Finally, a dimensional analysis of the phosphorus map led to an important finding: the existence of a fractal characteristic (D = 1.63) for the hydroxyapatite-matrix interface, a result of physical-geological events occurring with spatial scale invariance on the specimen, over millions of years.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, author = {Oliveira, Naiara C and Silva, Joao H and Barros, Olga A and Pinheiro, Allysson P and Santana, William and Saraiva, Antonio A F and Ferreira, Odair P and Freire, Paulo T C and Paula, Amauri J.}, biburl = {https://www.bibsonomy.org/bibtex/28847eec169906f872d97cf571b70e385/ppgfis_ufc_br}, doi = {10.1021/acs.analchem.5b02815}, interhash = {57bd878be42b2fcb5764d63b1e5f1825}, intrahash = {8847eec169906f872d97cf571b70e385}, issn = {0003-2700}, journal = {ANALYTICAL CHEMISTRY}, keywords = {imported}, number = 19, pages = {10088-10095}, publisher = {AMER CHEMICAL SOC}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Large-Field Electron Imaging and X-ray Elemental Mapping Unveil the Morphology, Structure, and Fractal Features of a Cretaceous Fossil at the Centimeter Scale}, tppubtype = {article}, volume = 87, year = 2015 }