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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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Southern Africa
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Namibia (2)
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Antarctica
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Victoria Land
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Primary terms
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atmosphere (4)
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carbon
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Quaternary
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Tertiary
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Paleogene
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Eocene
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lower Eocene (2)
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Paleocene
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lower Paleocene
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Danian (2)
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K-T boundary (3)
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upper Paleocene (2)
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Paleocene-Eocene Thermal Maximum (6)
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Central America
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Alps
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Central Europe
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Poland
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Southern Europe
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Italy
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hydrology (7)
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inclusions
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fluid inclusions (1)
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Invertebrata
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Crustacea
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Ostracoda (1)
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-
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Brachiopoda (4)
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Anthozoa (1)
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Echinodermata
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Asterozoa
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Stelleroidea
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Ophiuroidea (1)
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-
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Mollusca
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Bivalvia
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Porifera (1)
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Protista
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Foraminifera
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Miliolidae (2)
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Rotaliina
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Buliminacea
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Bulimina (1)
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Globigerinacea
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Rotalipora (1)
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Ammonia (1)
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-
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Textulariina (1)
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Vermes
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Annelida (1)
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isotopes
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radioactive isotopes
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I-129 (1)
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Ra-226 (1)
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Re-187/Os-188 (1)
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tritium (1)
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stable isotopes
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B-11/B-10 (3)
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C-13/C-12 (9)
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Ca-44/Ca-40 (4)
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Mg-26/Mg-24 (1)
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O-18/O-16 (5)
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Re-187/Os-188 (1)
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S-34/S-32 (1)
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Sr-87/Sr-86 (1)
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Mediterranean Sea
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Hell Creek Formation (1)
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K-T boundary (3)
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Maestrichtian (1)
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-
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Jurassic
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Lower Jurassic
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Pliensbachian (1)
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Toarcian
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lower Toarcian (1)
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-
-
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Triassic
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Lower Triassic
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Permian-Triassic boundary (5)
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Upper Triassic (2)
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acidification
Two-pronged kill mechanism at the end-Triassic mass extinction
Influence of acid activation on the NH 3 -adsorption properties of a Turkish bentonite
Preparation and characterization of quaternary ammonium salt and 3-aminopropyltriethoxysilane-modified sericite mica
Calcium isotope composition of Morozovella over the late Paleocene–early Eocene
Copper supported on acid-activated vermiculite as an efficient and recyclable catalyst for the Biginelli reaction: a green approach
Water well acidization revisited: includes oil and geothermal well perspectives
Zinc supported on acid-activated montmorillonite for aromatization reactions
Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods
Direct evidence of sediment carbonate dissolution in response to bottom-water acidification in the Gulf of St. Lawrence, Canada
ABSTRACT The latest Cretaceous (Maastrichtian) through earliest Paleogene (Danian) interval was a time marked by one of the five major mass extinctions in Earth’s history. The synthesis of published data permits the temporal correlation of the Cretaceous-Paleogene boundary crisis with two major geological events: (1) the Chicxulub impact, discovered in the Yucatán Peninsula (Mexico), and (2) eruption of the Deccan Traps large igneous province, located on the west-central Indian plateau. In this study, environmental and biological consequences from the Chicxulub impact and emplacement of the Deccan continental flood basalts were explored using a climate-carbon-biodiversity coupled model called the ECO-GEOCLIM model. The novelty of this study was investigation into the ways in which abiotic factors (temperature, pH, and calcite saturation state) acted on various marine organisms to determine the primary productivity and biodiversity changes in response to a drastic environmental change. Results showed that the combination of Deccan volcanism with a 10-km-diameter impactor would lead to global warming (3.5 °C) caused by rising carbon dioxide (CO 2 ) concentration (+470 ppmv), interrupted by a succession of short-term cooling events, provided by a “shielding effect” due to the formation of sulfate aerosols. The consequences related to these climate changes were the decrease of the surface ocean pH by 0.2 (from 8.0 to 7.8), while the deep ocean pH dropped by 0.4 (from 7.8 to 7.4). Without requiring any additional perturbations, these environmental disturbances led to a drastic decrease of the biomass of calcifying species and their biodiversity by ~80%, while the biodiversity of noncalcifying species was reduced by ~60%. We also suggest that the short-lived acidification caused by the Chicxulub impact, when combined with eruption of the Deccan Traps, may explain the severity of the extinction among pelagic calcifying species.
Recent density decline in wild-collected subarctic crustose coralline algae reveals climate change signature
Earth's Outgassing and Climatic Transitions: The Slow Burn Towards Environmental “Catastrophes”?
Changing Trace Element Cycles in the 21 st Century Ocean
Global perturbation of the marine calcium cycle during the Permian-Triassic transition
Combined Impacts of Ocean Acidification and Dysoxia On Survival and Growth of Four Agglutinating Foraminifera
Geochemical and mineralogical characterization of tailings of the Dexing copper mine, Jiangxi Province, China
Biomineralization and global change: A new perspective for understanding the end-Permian extinction
The highest stages of the stratigraphic range of the planktonic foraminiferal Rotalipora cushmani were investigated in a 313-k.y.-long interval of the classical Tethyan Bottaccione section (Gubbio, Italy), the type locality of the C org- rich Bonarelli Level, which is the sedimentary expression of the worldwide latest Cenomanian oceanic anoxic event 2 (OAE 2).The disappearance of R. cushmani is associated with the major turnover of marine microfauna and microflora that involves both planktonic and benthic foraminifera, and calcareous nannofossils, slightly before the onset of OAE 2, which, according to current available data, was triggered by a massive pulse of submarine mafic volcanism accompanying the initial emplacement of the Caribbean large igneous province (CLIP). This pulse of volcanic activity probably turned the climate in a strengthened greenhouse mode, accelerating continental weathering and increasing nutrient supply in oceanic surface waters via river runoff and triggering higher fertility in the global ocean. Our investigation shows that the marine biotic turnover started ~55 k.y. before the onset of OAE 2 and is closely coeval with the first major episode, as recorded by the unradiogenic trend in 187 Os/ 188 Os, of the ongoing magmatic activity of the CLIP, which produced increasing p CO 2 , ocean dissolution and/or acidification with a severe carbonate crisis and fertilization through enormous quantities of biolimiting metals. The marine microfauna and microflora reacted rapidly to new conditions of higher p CO 2 and fertility by undergoing marked changes following three main steps. We evaluate this pattern and postulate that the first pulse of volcanogenic CO 2 from the CLIP emplacement (ca. 94.2 or 94.6 Ma) played a fundamental role in the marine biotic turnover recorded shortly before the onset of OAE 2 and notably in the local or regional disappearance of R. cushmani in the central-western Tethys.