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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Ethiopia (1)
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Ethiopian Rift (1)
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Asia
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Far East
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Mongolia (1)
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Europe
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Front Range (1)
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North America
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Salmon River (1)
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South America
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Amazonian Craton (1)
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Brazil (1)
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United States
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Colorado
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Jefferson County Colorado
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Idaho
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Valley County Idaho (1)
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Nevada
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commodities
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metal ores
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mineral deposits, genesis (3)
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elements, isotopes
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carbon
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hydrogen
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isotope ratios (3)
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isotopes
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stable isotopes
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metals
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strontium
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noble gases
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argon
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oxygen
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sulfur
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S-34/S-32 (1)
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fossils
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Chordata
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Vertebrata
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Mammalia
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Theria
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Primates
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Invertebrata
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sulfides
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Primary terms
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Africa
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Ethiopia (1)
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Ethiopian Rift (1)
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Asia
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Far East
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Mongolia (1)
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carbon
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C-13/C-12 (1)
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Cenozoic
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Quaternary
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Holocene
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Mesolithic (1)
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Stone Age
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Tertiary
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Challis Volcanics (1)
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Neogene
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Miocene (1)
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Paleogene
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Eocene
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middle Eocene (1)
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lower Paleogene (1)
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Oligocene
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Fish Canyon Tuff (1)
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Paleocene
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lower Paleocene (1)
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chemical analysis (1)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Primates
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Hominidae
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Homo
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Homo sapiens (1)
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Europe
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Southern Europe
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Italy
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Marches Italy (1)
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faults (1)
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hydrogen
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igneous rocks
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quartz diorites (1)
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granodiorites (1)
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volcanic rocks
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inclusions
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intrusions (2)
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Invertebrata
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Protista
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isotopes
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radioactive isotopes
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Ar-40/Ar-39 (1)
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stable isotopes
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Ar-40/Ar-39 (1)
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C-13/C-12 (1)
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D/H (1)
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O-18/O-16 (1)
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S-34/S-32 (1)
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Sr-87/Sr-86 (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous (2)
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Triassic
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Lower Triassic (1)
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metal ores
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antimony ores (1)
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copper ores (1)
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gold ores (2)
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molybdenum ores (1)
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tungsten ores (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (1)
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metamorphic rocks (1)
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mineral deposits, genesis (3)
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mineral exploration (1)
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noble gases
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argon
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North America
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oxygen
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paleomagnetism (1)
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Precambrian
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South America
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United States
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Colorado
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Jefferson County Colorado
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Idaho
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Valley County Idaho (1)
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Nevada
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Lincoln County Nevada (1)
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rock formations
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Denver Formation (1)
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Timing of Hydrothermal Alteration and Au-Sb-W Mineralization, Stibnite-Yellow Pine District, Idaho
Paleogene Sedimentary Basin Development in Southern Nevada, USA
Early Neoproterozoic Gold Deposits of the Alto Guaporé Province, Southwestern Amazon Craton, Western Brazil
Interpreting and reporting 40 Ar/ 39 Ar geochronologic data
Multiproxy Cretaceous-Paleogene boundary event stratigraphy: An Umbria-Marche basinwide perspective
ABSTRACT The complete and well-studied pelagic carbonate successions from the Umbria-Marche basin (Italy) permit the study of the event-rich stratigraphic interval around the Cretaceous-Paleogene boundary (e.g., Deccan volcanism, boundary impact, Paleocene recovery, and climate). To test the robustness of various proxy records (bulk carbonate δ 13 C, δ 18 O, 87 Sr/ 86 Sr, and Ca, Fe, Sr, and Mn concentrations) inside the Umbria-Marche basin, several stratigraphically equivalent sections were investigated (Bottaccione Gorge, Contessa Highway, Fornaci East quarry, Frontale, Morello, and Petriccio core). Besides the classical Gubbio sections of Bottaccione and Contessa, the new Morello section is put forward as an alternative location for this stratigraphic interval because it is less altered by burial diagenesis. Elemental profiles (Ca, Fe, Sr, Mn) acquired by handheld X-ray fluorescence (pXRF) efficiently provide regional chemostratigraphic and paleoenvironmental information. The Deccan volcanism, the Cretaceous-Paleogene boundary, the characteristic pattern of the Sr/Ca profile across the boundary driven by the extinction and recovery of coccolithophores, and the Dan-C2 hyperthermal event are examples of such recorded paleoenvironmental events. Moreover, cyclostratigraphic analyses of proxies of detrital input (magnetic susceptibility and Fe concentrations) show the imprint in the sedimentary record of a 2.4 m.y. eccentricity minimum around 66.45–66.25 Ma, and suggest that the occurrence of the Dan-C2 hyperthermal event was astronomically paced.