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Physico-chemical analysis of Albian (Lower Cretaceous) amber from San Just (Spain) : implications for palaeoenvironmental and palaeoecological studies
Dal Cors, J. (Università degli Studi di Padova. Dipartimento di Geoscienze)
Roghi, G. (Istituto di Geoscienze e Georisorse (IGG-CNR))
Ragazzi, E. (Università degli Studi di Padova. Dipartimento di Scienze del Farmaco)
Angelini, I. (Università degli Studi di Padova. Dipartimento di Geoscienze)
Giaretta, A. (Istituto di Geoscienze e Georisorse (IGG-CNR))
Soriano, C. (European Synchrotron Radiation Facilities (ESRF))
Delclòs, X. (Universitat de Barcelona. Department d’Estratigrafia, Paleontologia i Geociències Marines)
Jenkyns, H.C. (University of Oxford. Department of Earth Sciences)

Data: 2013
Resum: Amber from a Lower Cretaceous outcrop at San Just, located in the Eastern Iberian Peninsula (Escucha Formation, Maestrat Basin), was investigated to evaluate its physico-chemical properties. Thermogravimetric (TG) and Differential Thermogravimetric (DTG) analyses, infra-red spectroscopy, elemental and C-isotope analyses were performed. Physico-chemical differences between the internal light nuclei and the peripheral darker portions of San Just amber can be attributed to processes of diagenetic alteration that preferentially took place in the external amber border colonized by microorganisms (fungi or bacteria) when the resin was still liquid or slightly polymerized. δ13Camber values of different pieces of the same sample, from the nucleus to the external part, are remarkably homogeneous, as are δ13Camber values of the darker peripheral portions and lighter inner parts of the same samples. Hence, neither invasive microorganisms, nor diagenetic alteration changed the bulk isotopic composition of the amber. δ13C values of different amber samples range from -21. 1‰ to -24‰, as expected for C3 plant-derived material. C-isotope analysis, coupled to palaeobotanical, TG and DTG data and infra-red spectra, suggests that San Just amber was exuded by only one conifer species, belonging to either the Cheirolepidiaceae or Aracauriaceae, coniferous families probably living under stable palaeoenvironmental and palaeoecological conditions.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l’obra i la creació d’obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l’obra original i es reconegui l’autoria de l’obra original. Creative Commons
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Matèria: Amber ; C-isotopes ; Thermogravimetric analyses ; Infra-red spectroscopy ; Cretaceous
Publicat a: Geologica acta, Vol. 11, Núm. 3 (September 2013) , p. 359-370, ISSN 1696-5728

DOI: 10.1344/105.000001871

14 p, 777.0 KB

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