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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
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Africa
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Afar (1)
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Central Africa
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Angola (1)
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Gabon
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Oklo (1)
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East Africa
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Zambia (1)
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East African Rift (1)
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North Africa
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Illizi Basin (1)
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Morocco
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Rif (1)
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Sahara (1)
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West Africa
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Niger (1)
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Antarctica (1)
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Arctic region
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Asia
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Central Asia
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Kazakhstan
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Far East
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Mahakam Delta (1)
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North America
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Southeast Pacific
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Equatorial Pacific (1)
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South Pacific
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West Pacific
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elements, isotopes
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halogens
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hydrogen (2)
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stable isotopes
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Ar-40 (1)
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He-4/He-3 (2)
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metals
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alkaline earth metals
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antimony (2)
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silver (1)
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nitrogen (1)
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helium
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oxygen
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fossils
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Vertebrata
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Mammalia (1)
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dinosaurs
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Synapsida
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Invertebrata
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Protista
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Foraminifera
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microfossils (1)
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Plantae
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geochronology methods
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geologic age
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Quaternary
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upper Holocene
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Pleistocene
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upper Pleistocene
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upper Weichselian
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upper Quaternary (1)
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Tertiary
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lower Tertiary (1)
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Pliocene
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Paleogene
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lower Eocene
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Paleocene (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (1)
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Jurassic
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Middle Jurassic
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Triassic
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Upper Triassic
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Keuper (1)
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Paleozoic
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Cambrian
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Mount Read Volcanics (1)
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Upper Cambrian
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Bonneterre Formation (1)
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Lamotte Sandstone (1)
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Carboniferous
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Mississippian
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Lower Mississippian (1)
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Namurian (1)
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Upper Carboniferous
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-
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Devonian
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Upper Devonian (2)
-
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Ordovician
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Lower Ordovician
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Beekmantown Group (1)
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Upper Ordovician
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Whitewater Formation (1)
-
-
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Permian
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Upper Permian
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Permian-Triassic boundary (1)
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Zechstein (1)
-
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Silurian
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Vassalboro Formation (1)
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upper Paleozoic
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Tirrawarra Sandstone (1)
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Precambrian
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upper Precambrian
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Proterozoic (1)
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Saxothuringian (1)
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igneous rocks
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igneous rocks
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carbonatites (1)
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kimberlite (1)
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plutonic rocks
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granites
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porphyry (1)
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volcanic rocks
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minerals
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phosphates
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silicates
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pyroxene group
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framework silicates
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plagioclase
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silica minerals
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chalcedony (1)
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opal (1)
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quartz (2)
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orthosilicates
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nesosilicates
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olivine group
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ringwoodite (1)
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zircon group
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zircon (2)
-
-
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sorosilicates
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epidote group
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zoisite (1)
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-
-
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sheet silicates
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clay minerals
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montmorillonite (2)
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illite (3)
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mica group
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palygorskite (1)
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sulfates (1)
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pyrite (1)
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sphalerite (1)
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sulfosalts (1)
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Primary terms
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absolute age (5)
-
Africa
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Afar (1)
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Central Africa
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Angola (1)
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Gabon
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Oklo (1)
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-
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East Africa
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Zambia (1)
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East African Rift (1)
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North Africa
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Illizi Basin (1)
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Morocco
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Rif (1)
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Sahara (1)
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West Africa
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Niger (1)
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Antarctica (1)
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Arctic Ocean
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Arctic region
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Greenland
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Greenland ice sheet (1)
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Svalbard
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Asia
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Arabian Peninsula
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heat transfer
Application of the Electromagnetic Geothermometer in Geothermics and Geothermal Exploration
Simulation and Analysis of the Thermal-Mechanical Response of an Energy Pile
Numerical Simulation and Design Optimization of Large-Scale Geothermal Production Based on a Multiwell Layout in Xianxian Geothermal Field
Study on the Mechanism of Water and Heat Transfer in Sandstone Geothermal System: A Case Study of Doublet Well
Impact of a northern-hemispherical cryosphere on late Pliensbachian–early Toarcian climate and environment evolution
Abstract The historical view of an equable Jurassic greenhouse world has been challenged by recent studies documenting recurrent alternation between contrasting climate modes. Cooling of high-latitudinal areas may have been caused by orogenic processes at the northern margin of the Tethys Ocean that reduced heat transport towards the polar regions. Warm phases correlate to periods of intensified volcanism. The Jenkyns Event occurred during the transition from a late Pliensbachian icehouse into an early Toarcian greenhouse. Parallel evolution of different environmental processes, including sea level, climate and carbon cycle, indicate a causal mechanism tied to astronomical forcing. Insolation-controlled variations in the extent of the cryosphere (ice caps and permafrost) facilitated orbitally paced sea-level cycles via waxing and waning of the polar ice caps, and negative carbon isotope excursions via the release of cryosphere-bound 12 C-enriched carbon. This review and synthesis of sedimentological, geochemical and palaeontological palaeoenvironment indicators, and of simulations from climate models, aims to reconstruction, in particular, the high-latitudinal environmental conditions of late Pliensbachian–early Toarcian times. Focus is laid on the extent of the regions that were potentially suitable for hosting a cryosphere. An environmental response to cryosphere dynamics is considered to have been a key component of the Jenkyns Event.