Journal
ORGANIC GEOCHEMISTRY
Volume 93, Issue -, Pages 7-21Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2015.12.010
Keywords
Amber; Fossil resin; Tetralin; Cretaceous; Basque-Cantabrian Basin; Labdane biomarkers
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Funding
- Spanish Centro de Astrobiologia (CSIC-INTA)
- Museo de Ciencias Naturales de Alava (Diputacion de Alava, Basque Country, Spain)
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One of the major components of the organic solvent extractable fraction of Cretaceous ambers is 1,6dimethyl-5-isopentyltetralin, a compound that has been incorrectly or not identified in previous reports on the molecular composition of Cretaceous ambers. Here, the purification and structural identification of 1,6-dimethyl-5-isopentyltetralin is reported from amber samples of the Cretaceous Penacerrada II deposit at Penacerrada, Alava (Basque-Cantabrian Basin, Spain). The structural identification of 1,6-dimethyl-5-isopentyltetralin allowed the complete identification of related compounds, comprising the family of 1,6-dimethyl-5-alkyltetralins. This suggests that those compounds, with concentrations up to 27% of the total organic extract of amber from Penacerrada, are characteristic for labdane-type biomarkers in Cretaceous fossil resins and their distributions indicate different compositional families, related to their botanical and topographic origin. Also, the name amberene is proposed for the main molecule of this group. The relative proportion of the amberene-type compounds suggests three compositional families for the Cretaceous Spanish ambers. (C) 2015 Elsevier Ltd. All rights reserved.
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