Jehlicka Jan, Edwards Howell G M, Villar Susana E J, Pokorný Jan
Charles University, Institute of Geochemistry, Mineralogy and Mineral Resources, Albertov 6, 12843 Prague 2, Czech Republic.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Aug;61(10):2390-8. doi: 10.1016/j.saa.2005.02.018.
FT-Raman spectra were obtained from the natural hydrocarbon mixtures ozokerite and hatchettite as well as from the terpenoid minerals fichtelite (norabietane) and hartite (alpha-phyllocladane). Some of these hydrocarbons occur in soil and peat environments of Holocene age. However, hartite occurs in lignite, in fossilised Glyptostrobus (Taxodiaceae) trees and in pelosiderites of the Bílina Miocene series (about 20 Ma); it represents the accumulated and crystallised product of diagenetic transformation of precursor biogenic terpenoids. Raman spectra of earth waxes investigated confirm their dominantly aliphatic character and oxidative degradation (related to weathering and/or subaerial alteration in museum cabinets). Vibrational assignments are proposed and differences in Raman spectra of fichtelite and hartite discussed. Some of the individual features can be used for discrimination (e.g., hartite bands at 1480, 1310, 1287, 1041, 729 and 693 cm(-1) and fichtelite bands at 1302, 836, 717 and 533 cm(-1)).
傅里叶变换拉曼光谱是从天然烃类混合物地蜡和石蜡以及萜类矿物富希特石（降蒈烷）和哈蒂石（α-叶枝烷）中获得的。其中一些烃类存在于全新世的土壤和泥炭环境中。然而，哈蒂石存在于褐煤、化石水松（杉科）树木以及比林纳中新世系列（约2000万年）的泥质铁岩中；它代表了前体生物萜类成岩转化的积累和结晶产物。所研究的地蜡的拉曼光谱证实了它们主要的脂肪族特征以及氧化降解（与博物馆展柜中的风化和/或露天变化有关）。提出了振动归属并讨论了富希特石和哈蒂石拉曼光谱的差异。一些个别特征可用于鉴别（例如，哈蒂石在1480、1310、1287、1041、729和693 cm⁻¹处的谱带以及富希特石在1302、836、717和533 cm⁻¹处的谱带）。
