Search Results - "Tappert, Ralf"

Stable carbon isotopes of C3 plant resins and ambers record changes in atmospheric oxygen since the Triassic by Tappert, Ralf, McKellar, Ryan C., Wolfe, Alexander P., Tappert, Michelle C., Ortega-Blanco, Jaime, Muehlenbachs, Karlis

“…Estimating the partial pressure of atmospheric oxygen (pO2) in the geological past has been challenging because of the lack of reliable proxies. Here we…”
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A new proposal concerning the botanical origin of Baltic amber by Wolfe, Alexander P., Tappert, Ralf, Muehlenbachs, Karlis, Boudreau, Marc, McKellar, Ryan C., Basinger, James F., Garrett, Amber

“…Sciadopitys verticillata…”
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Pristine Early Eocene wood buried deeply in kimberlite from northern Canada by Wolfe, Alexander P, Csank, Adam Z, Reyes, Alberto V, McKellar, Ryan C, Tappert, Ralf, Muehlenbachs, Karlis

“…We report exceptional preservation of fossil wood buried deeply in a kimberlite pipe that intruded northwestern Canada's Slave Province 53.3±0.6 million years…”
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The trace element composition of silicate inclusions in diamonds: a review by Stachel, Thomas, Aulbach, Sonja, Brey, Gerhard P., Harris, Jeff W., Leost, Ingrid, Tappert, Ralf, Viljoen, K.S.(Fanus)

“…On a global scale, peridotitic garnet inclusions in diamonds from the subcratonic lithosphere indicate an evolution from strongly sinusoidal REE N, typical for…”
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Diamonds from Jagersfontein (South Africa): messengers from the sublithospheric mantle by Tappert, Ralf, Stachel, Thomas, Harris, Jeff W., Muehlenbachs, Karlis, Ludwig, Thomas, Brey, Gerhard P.

“…The diamond population from the Jagersfontein kimberlite is characterized by a high abundance of eclogitic, besides peridotitic and a small group of…”
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Bonebed amber as a new source of paleontological data: The case of the Pipestone Creek deposit (Upper Cretaceous), Alberta, Canada by Cockx, Pierre, McKellar, Ryan, Tappert, Ralf, Vavrek, Matthew, Muehlenbachs, Karlis

“…Amber deposits and dinosaur bonebeds provide some of the most detailed sources of information on terrestrial ecosystems, but these sources have rarely been…”
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Bitterfeld amber is not Baltic amber: Three geochemical tests and further constraints on the botanical affinities of succinite by Wolfe, Alexander P., McKellar, Ryan C., Tappert, Ralf, Sodhi, Rana N.S., Muehlenbachs, Karlis

“…Baltic and Bitterfeld ambers are important deposits of polymerized conifer resin that are widely recognized for their exquisite fossil inclusions, especially…”
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Amber from a Tyrannosaurus rex bonebed (Saskatchewan, Canada) with implications for paleoenvironment and paleoecology by Cockx, Pierre, Tappert, Ralf, Muehlenbachs, Karlis, Somers, Christopher, McKellar, Ryan C.

“…The Frenchman Formation (Maastrichtian) exposed within Chambery Coulee in southwestern Saskatchewan, Canada, has yielded exceptional vertebrate fauna…”
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The botanical provenance and taphonomy of Late Cretaceous Chatham amber, Chatham Islands, New Zealand by Mays, Chris, Coward, Andrew J., O'Dell, Luke A., Tappert, Ralf

“…Fossil resin (amber) has been recently reported as common, but small, sedimentary components throughout the lower Upper Cretaceous (Cenomanian; 99–94 Ma)…”
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Deuterium exchangeability in modern and fossil plant resins by González Arismendi, Gabriela, Tappert, Ralf, McKellar, Ryan C., Wolfe, Alexander P., Muehlenbachs, Karlis

“…Deuterium exchange experiments on modern and fossil plant resins (amber) were conducted to assess to what extent diagenetic alteration can overprint the stable…”
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The petrology of kimberlites from South Australia: Linking olivine macrocrystic and micaceous kimberlites by Tappert, Ralf, Foden, John, Heaman, Larry, Tappert, Michelle C., Zurevinski, Shannon E., Wills, Kevin

“…Kimberlites of Jurassic age occur in various parts of South Australia. Thirty-nine of these kimberlites, which are mostly new discoveries, were studied to…”
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New Canadian amber deposit fills gap in fossil record near end-Cretaceous mass extinction by Loewen, Elyssa J T, Balkwill, Micheala A, Mattioli, Júlia, Cockx, Pierre, Caicedo, Maria Velez, Muehlenbachs, Karlis, Tappert, Ralf, Borkent, Art, Libke, Caelan, Engel, Michael S, Somers, Christopher, McKellar, Ryan C

“…Amber preserves an exceptional record of tiny, soft-bodied organisms and chemical environmental signatures, elucidating the evolution of arthropod lineages and…”
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A direct association between amber and dinosaur remains provides paleoecological insights by McKellar, Ryan C., Jones, Emma, Engel, Michael S., Tappert, Ralf, Wolfe, Alexander P., Muehlenbachs, Karlis, Cockx, Pierre, Koppelhus, Eva B., Currie, Philip J.

“…Hadrosaurian dinosaurs were abundant in the Late Cretaceous of North America, but their habitats remain poorly understood. Cretaceous amber is also relatively…”
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Water-Gas Shift and Methane Reactivity on Reducible Perovskite-Type Oxides by Thalinger, Ramona, Opitz, Alexander K, Kogler, Sandra, Heggen, Marc, Stroppa, Daniel, Schmidmair, Daniela, Tappert, Ralf, Fleig, Jürgen, Klötzer, Bernhard, Penner, Simon

“…Comparative (electro)­catalytic, structural, and spectroscopic studies in hydrogen electro-oxidation, the (inverse) water-gas shift reaction, and methane…”
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Automated drill core logging using visible and near-infrared reflectance spectroscopy; a case study from the Olympic Dam IOCG deposit, South Australia by Tappert, Michelle, Rivard, Benoit, Giles, David, Tappert, Ralf, Mauger, Alan

“…Reflectance spectrometers with automated scanning capabilities can gather compositional information directly from the surface of drill core. To showcase the…”
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Insect outbreaks produce distinctive carbon isotope signatures in defensive resins and fossiliferous ambers by McKellar, Ryan C, Wolfe, Alexander P, Muehlenbachs, Karlis, Tappert, Ralf, Engel, Michael S, Cheng, Tao, Sánchez-Azofeifa, G. Arturo

“…Despite centuries of research addressing amber and its various inclusions, relatively little is known about the specific events having stimulated the…”
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Corrigendum to ‘Stable carbon isotopes of C3 plant resins and ambers record changes in atmospheric oxygen since the Triassic’ [Geochim. Cosmochim. Acta 121 (2013) 240–262] by Tappert, Ralf, McKellar, Ryan C., Wolfe, Alexander P., Tappert, Michelle C., Ortega-Blanco, Jaime, Muehlenbachs, Karlis

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Characterizing Modern and Fossil Gymnosperm Exudates Using Micro-Fourier Transform Infrared Spectroscopy by Tappert, Ralf, Wolfe, Alexander P, McKellar, Ryan C, Tappert, Michelle C, Muehlenbachs, Karlis

“…Infrared absorption spectra of exudates from 65 species of gymnosperms were measured using micro-Fourier transform infrared (FTIR) spectroscopy. On the basis…”
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Garnet Peridotite Xenoliths and Xenocrysts from the Monk Hill Kimberlite, South Australia: Insights into the Lithospheric Mantle beneath the Adelaide Fold Belt by Tappert, Ralf, Foden, John, Muehlenbachs, Karlis, Wills, Kevin

“…A total of 73 peridotitic mantle xenoliths and a set of garnet and clinopyroxene xenocrysts from the recently discovered Jurassic Monk Hill kimberlite…”
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The diamonds of South Australia by Tappert, Ralf, Foden, John, Stachel, Thomas, Muehlenbachs, Karlis, Tappert, Michelle, Wills, Kevin

“…Diamonds in South Australia occur in kimberlites at Eurelia (Orroroo), and in placer deposits, which include the Springfield Basin and the historic Echunga…”
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