Zobrazeno 1 - 10
of 45
pro vyhledávání: '"William T. Holser"'
Publikováno v:
Science. 277:1745-1749
Yukio Isozaki outlines thresholds in deepening oceanic anoxia and subsequent oxygenation across the Permian-Triassic boundary (Reports, [11 Apr., p. 235][1]). He implies that mass extinction at this time was a product of oceanic stagnation many milli
Autor:
William T. Holser
Publikováno v:
Palaeogeography, Palaeoclimatology, Palaeoecology. 132:309-323
Anomalous departures of rare-earth elements (REE) from similarity of chemical behaviour are most evident in a comparison of Ce with its neighbors. Under reducing conditions Ce3+ acts like other REE, but oxidized Ce4+ is adsorbed on Mn-, Fe-oxyhydroxi
Autor:
William T. Holser
Publikováno v:
Palaeogeography, Palaeoclimatology, Palaeoecology. 132:173-182
Screening of sampling and analytical data is crucial for the detection of real global shifts in marine δ13C, against the noise of diagenesis. The real global shifts of 13C are of two types: (1) long-term secular shifts caused by changes in the fract
Publikováno v:
American Journal of Science. 292:727-739
Stable carbon isotope ratios in both inorganic and organic reservoirs have been widely applied to model environmental and sedimentological changes on a global scale. Most studies dealing with major extinction events have used the record of inorganic
Autor:
Mordeckai Magaritz, William T. Holser
Publikováno v:
Geochimica et Cosmochimica Acta. 56:3297-3309
The Cretaceous/Tertiary ( K T ) and Permian/Triassic ( P Tr ) events differ in many more aspects than they are similar. This alone makes it unlikely that they are parts of a common web of periodic mass extinction events (MEE). Unlike the K T , most M
Publikováno v:
Global Bio-Events ISBN: 3540171800
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0e91ae3f74bfeabab6d9cc692a51b44
https://doi.org/10.1007/bfb0010191
https://doi.org/10.1007/bfb0010191
Autor:
William T. Holser
Publikováno v:
Isotopic Signatures and Sedimentary Records ISBN: 3540558284
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ae14792be4a59dc9221b8333a81faf0
https://doi.org/10.1007/bfb0009864
https://doi.org/10.1007/bfb0009864
Publikováno v:
Global Events and Event Stratigraphy in the Phanerozoic ISBN: 9783642796364
More than 60 global “events” have been identified in the isotopic records of ∂ 13C, ∂ 18O, ∂ 34S and 87Sr/86Sr. Over half of these are carbon isotopic events, about equally divided between positive excursions (or a simple rise) and negative
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31a14fd9cceda46f5ad32fdbb2433242
https://doi.org/10.1007/978-3-642-79634-0_6
https://doi.org/10.1007/978-3-642-79634-0_6
Autor:
William T. Holser
Publikováno v:
Geochimica et Cosmochimica Acta. 56:3863-3864
Autor:
William T. Holser, Gregory J. Retallack, Evelyn S. Krull, Abbas Seyedolali, Clifford P. Ambers, Frank T. Kyte
Publikováno v:
Geology. 26:979
Life on Earth was almost destroyed some 250 m.y. ago in the most profound of all known mass extinction events. We investigated the possible role of impact by an extraterrestrial bolide through chemical and mineralogical characterization of boundary b