Results 211 to 220 of about 379,518 (254)
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Deuterium exchangeability in modern and fossil plant resins
Geochimica et Cosmochimica Acta, 2018Abstract Deuterium exchange experiments on modern and fossil plant resins (amber) were conducted to assess to what extent diagenetic alteration can overprint the stable hydrogen (δ2H) and carbon (δ13C) isotopic composition of these materials. Pairs of resins and amber fragments were placed together with deuterated water in sealed quartz-glass tubes ...
Gabriela González Arismendi +4 more
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Recent and fossil resins from New Zealand and Australia
Geoarchaeology, 1993AbstractThe carbon‐13 nuclear magnetic resonance spectra of fossil resins from New Zealand and Australia have been compared with those of modern and semifossilized materials. The great majority of the fossilized samples have strong spectral similarities to modernAgathisresins and to North American fossil resins, which have been attributed to Agathis ...
Joseph B. Lambert +3 more
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X-Ray Diffraction Study of Some Fossil and Modern Resins
Science, 1967Samples of both fossil and modern resins have been investigated by x-ray diffraction techniques. Most fossil resins (ambers) yield only diffuse x-ray diffraction patterns, though some (settlingite, Highgate copalite, and guayaquillite) have relatively sharp patterns. Many modern resins, including those from species of Pinus
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Fossil resins – A chemotaxonomical overview
Earth-Science ReviewsJ. Pańczak +3 more
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The overview of analytical methods for studying of fossil natural resins
Critical Reviews in Analytical Chemistry, 2023The review presents methods that are used frequently for multi-analytical study of fossil resins. The preliminary characterization relies on physical methods such as microhardness, density and fluorescence in UV light measurements. The spectroscopic methods: infrared spectroscopy, Raman spectroscopy, fluorescence spectroscopy are also presented in the ...
Lucyna Natkaniec-Nowak +4 more
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Fossil resins of Alaska: history of study
Vestnik of geosciences, 2023The article reviewes the current state of knowledge of fossil resin finds in Alaska (USA). On the basis of little-known and fragmentary documents found in both Russian and foreign scientific literature, their main locations are briefly described. The primacy of Russian researchers mentioning fossil resins of coastal regions of Alaska is noted.
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Arthropods in contemporary and some fossil resins
Paleontological Journal, 2009More than 4800 arthropod inclusions were isolated and identified from resin of various contemporary conifer trees in various parts of northern Eurasia. Their composition is compared with that in representative collections of Baltic and Rovno ambers (Upper Eocene) and with that in Dominican amber (Lower Miocene).
V. V. Zherikhin +2 more
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Duxite – Fossil resin of Miocene age
Organic Geochemistry, 2018Abstract A series of Miocene fossil resin from the northwest part of the Czech Republic, called duxite, has been analyzed by elemental, microscopic, gas chromatography (GC/MS), pyrolysis-gas chromatography, Fourier Transform infrared (FTIR), and Raman techniques.
Martina Havelcová +6 more
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Chemical Signatures of Fossilized Resins and Recent Plant Exudates
Angewandte Chemie International Edition, 2008AbstractAmber is one of the few gemstones based on an organic structure. Found over most of the world, it is the fossil form of sticky plant exudates called resins. Investigation of amber by modern analytical techniques provides structural information and insight into the identity of the ancient plants that produced the source resin. Mass spectrometric
Joseph B, Lambert +2 more
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Amber, Resinite, and Fossil Resins
1996Biology of Amber-Producing Trees: Focus on Case Studies of Hymenaea and Agathis Stable Isotope Composition of Amber Resin-Derived Hydrocarbons in Fresh and Fossil Dammar Resins and Miocene Rocks and Oils in the Mahakam Delta, Indonesia Pyrolytic and Spectroscopic Studies of the Diagenetic Alteration of Resinites Maturation of Class Ib (Polylabdanoid ...
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