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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Western Canada
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Alberta (1)
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Crazy Mountains (1)
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North America
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Rocky Mountains (1)
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Williston Basin (1)
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United States
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Bighorn Basin (1)
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Montana (1)
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Powder River basin (1)
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Washakie Basin (1)
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Wyoming (1)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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O-18/O-16 (1)
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Sr-87/Sr-86 (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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oxygen
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O-18/O-16 (1)
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fossils
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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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Carnivora
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Fissipeda
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Ursidae
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Ursus (1)
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Proboscidea
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Elephantoidea
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Elephantidae
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Mammuthus (1)
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Mastodontoidea (1)
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Invertebrata
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Mollusca
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Bivalvia (1)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene (1)
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Tertiary
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Paleogene
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Eocene
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lower Eocene (1)
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Paleocene
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upper Paleocene (1)
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Primary terms
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Canada
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Western Canada
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Alberta (1)
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene (1)
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Tertiary
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Paleogene
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Eocene
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lower Eocene (1)
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Paleocene
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upper Paleocene (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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Carnivora
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Fissipeda
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Ursidae
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Ursus (1)
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Proboscidea
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Elephantoidea
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Elephantidae
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Mammuthus (1)
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Mastodontoidea (1)
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geochemistry (1)
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Invertebrata
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Mollusca
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Bivalvia (1)
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isotopes
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stable isotopes
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O-18/O-16 (1)
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Sr-87/Sr-86 (1)
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-
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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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North America
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Rocky Mountains (1)
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Williston Basin (1)
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orogeny (1)
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oxygen
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O-18/O-16 (1)
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paleoclimatology (1)
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paleoecology (1)
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sedimentary rocks (1)
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stratigraphy (1)
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United States
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Bighorn Basin (1)
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Montana (1)
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Powder River basin (1)
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Washakie Basin (1)
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Wyoming (1)
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weathering (1)
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sedimentary rocks
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sedimentary rocks (1)
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Widespread basement erosion during the late Paleocene–early Eocene in the Laramide Rocky Mountains inferred from 87 Sr/ 86 Sr ratios of freshwater bivalve fossils
Carbon, oxygen, and hydrogen isotope results from carbonate and silicate fractions of altered core samples from the Yaxcopoil-1 borehole drilled into the 65 Ma Chicxulub impact crater provide constraints on the physico-chemical parameters of the hydrothermal solutions, and their likely origin. Yaxcopoil-1 impactites were initially permeated with calcite and halite at ambient temperature. This was followed by thermal metamorphism (diopside after igneous augite) and widespread Na-K metasomatism (feldspar after igneous plagioclase), which were overprinted by abundant lower-temperature clay and calcite. Silicate fraction isotopic values have δ 18 O SMOW values between 10 and 23‰ indicating important isotopic exchange between impact melt (∼8‰) and Cretaceous limestone (∼26‰). Heavier δ 18 O values occur over depth intervals with intense feldspar alteration (813–833 m and 864–872 m). The δD SMOW values (−34 to −54‰) are chiefly influenced by smectite abundance and roughly mirror δ 18 O values. Carbonate fraction δ 18 O SMOW values (22–30‰) are controlled by calcite contents, and several exceed the limestone signature. Most δ 13 C PDB (−1 to +2‰) values also cluster around that of local limestone, but a number are significantly lighter (down to −7‰). Isotopic and fluid inclusion results indicate hydrothermal fluid temperatures between 270 and 100 °C, high salinities (∼20%), and minor kerogen contents. These data are compatible with mineralogical constraints, which further support an increase in oxidation state with decreasing temperature. Isotopic data point to a saline CO 2 -bearing fluid mixed with small amounts of reduced carbon, and decarbonation and infiltration processes. Combined results are most consistent with a basinal oilfield saline brine that was driven by impact-induced heat.