- Tytuł:
- Red Devonian trilobites with green eyes from Morocco and the silicification of the trilobite exoskeleton
- Autorzy:
-
Klug, C
Schulz, H.
De Baets, K. - Powiązania:
- https://bibliotekanauki.pl/articles/22483.pdf
- Data publikacji:
- 2009
- Wydawca:
- Polska Akademia Nauk. Instytut Paleobiologii PAN
- Tematy:
-
trilobite
silicification
diagenesis
Trilobita
Morocco
paleontology
mud mound
taphonomy
exoskeleton
transgression
Devonian - Opis:
- Latest Emsian (Early Devonian) sediments at the famous mud−moundand trilobite−locality Hamar Laghdad (Tafilalt, Morocco) yielded some red−coloured remains of phacopid trilobites. Closer examination revealed that the eyes of these phacopids are often greenish in colour. EDX−analyses showed that the lenses retained their original calcitic composition, possibly greenish due to Feand Mn−impurities, while most of the exoskeleton was silicified. The silicified parts contain elevated concentrations of iron which causes the red colour. This phenomenon is explained by the porosity of the exoskeleton in contrast to the homogeneous and massive construction of the lenses and their Mg−content. These incompletely silicified trilobites enabled a reconstruction of the silicification process in trilobites. Their diagenetic alteration probably occurred as a result of events associated with the Cretaceous transgression.
- Źródło:
-
Acta Palaeontologica Polonica; 2009, 54, 1; 117-123
0567-7920 - Pojawia się w:
- Acta Palaeontologica Polonica
- Dostawca treści:
- Biblioteka Nauki
Artykuł