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The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 million years ago (Ma) to the start of the Silurian Period 443.8 Mya.
Permafrost is soil or underwater sediment which continuously remains below 0 °C (32 °F) for two years or more: the oldest permafrost had been continuously frozen for around 700,000 years. While the shallowest permafrost has a vertical extent of below a meter, the deepest is greater than 1,500 m (4,900 ft). Similarly, the area of individual permafrost zones may be limited to narrow mountain summits or extend across vast Arctic regions. The ground beneath glaciers and ice sheets is not usually defined as permafrost, so on land, permafrost is generally located beneath a so-called active layer of soil which freezes and thaws depending on the season.
Melville Island is an uninhabited member of the Queen Elizabeth Islands of the Arctic Archipelago. With an area of 42,149 km2 (16,274 sq mi), It is the 33rd largest island in the world and Canada's eighth largest island.
Haughton impact crater is located on Devon Island, Nunavut in far Northern Canada. It is about 23 km (14 mi) in diameter and was formed 31-32 million years ago during the Early Oligocene. The impacting object is estimated to have been approximately 2 km (1.2 mi) in diameter. Devon Island itself is composed of Paleozoic shale and siltstone overlying gneissic bedrock. When the crater formed, the shale and siltstone were peeled back to expose the basement; material from as deep as 1,700 m (5,600 ft) has been identified.
The New Siberian Islands are an archipelago in the Extreme North of Russia, to the north of the East Siberian coast between the Laptev Sea and the East Siberian Sea north of the Sakha (Yakutia) Republic, of which they are administratively a part.
Ellef Ringnes Island is an uninhabited island and one of the Sverdrup Islands in the Qikiqtaaluk Region, Nunavut, Canada. A member of the Queen Elizabeth Islands and Arctic Archipelago, it is located in the Arctic Ocean, east of Borden Island, and west of Amund Ringnes Island. It has an area of 11,295 km2 (4,361 sq mi), making it the 69th largest island in the world and Canada's 16th largest island. Its highest mount is 260 m (850 ft).
Isotope geochemistry is an aspect of geology based upon the study of natural variations in the relative abundances of isotopes of various elements. Variations in isotopic abundance are measured by isotope ratio mass spectrometry, and can reveal information about the ages and origins of rock, air or water bodies, or processes of mixing between them.
The Varanger Peninsula is a peninsula in Finnmark county, Norway. It is located in the northeasternmost part of Norway, along the Barents Sea. The peninsula has the Tanafjorden to the west, the Varangerfjorden to the south, and the Barents Sea to the north and east. The municipalities of Vadsø, Båtsfjord, Berlevåg, Vardø, Tana, and Nesseby share the 2,069-square-kilometre (799 sq mi) peninsula. Nesseby and Tana are only partially on the peninsula, with the rest being entirely on the peninsula. The Varangerhalvøya National Park protects most of the land on the peninsula.
Thermokarst is a type of terrain characterised by very irregular surfaces of marshy hollows and small hummocks formed as ice-rich permafrost thaws. The land surface type occurs in Arctic areas, and on a smaller scale in mountainous areas such as the Himalayas and the Swiss Alps.
Aufeis is a sheet-like mass of layered ice that forms from successive flows of ground or river water during freezing temperatures. This form of ice is also called overflow, icings, or the Russian term, naled. The term "Aufeis" was first used in 1859 by Alexander von Middendorff following his observations of the phenomenon in northern Siberia.
In geochemistry, paleoclimatology and paleoceanography δ18O or delta-O-18 is a measure of the ratio of stable isotopes oxygen-18 (18O) and oxygen-16 (16O). It is commonly used as a measure of the temperature of precipitation, as a measure of groundwater/mineral interactions, and as an indicator of processes that show isotopic fractionation, like methanogenesis. In paleosciences, 18O:16O data from corals, foraminifera and ice cores are used as a proxy for temperature.
The International Permafrost Association (IPA), founded in 1983, is an international professional body formed to foster the dissemination of knowledge concerning permafrost and to promote cooperation among individuals and national or international organisations engaged in scientific investigation and engineering work related to permafrost and seasonally frozen ground. The IPA became an Affiliated Organisation of the International Union of Geological Sciences in July 1989.
The Global Meteoric Water Line (GMWL) describes the global annual average relationship between hydrogen and oxygen isotope (Oxygen-18 and Deuterium) ratios in natural meteoric waters. The GMWL was first developed in 1961 by Harmon Craig, and has subsequently been widely used to track water masses in environmental geochemistry and hydrogeology.
Jack Gordon Souther was an American-born Canadian geologist, volcanologist, professor and engineer. He contributed significantly to the early understanding of recent volcanic activity in the Canadian Cordillera. Many of his publications continue to be regarded as classics in their field, even now several decades after they were written.
The geology of Saudi Arabia includes Precambrian igneous and metamorphic basement rocks, exposed across much of the country. Thick sedimentary sequences from the Phanerozoic dominate much of the country's surface and host oil.
The geology of the Northwest Territories has been mapped in different quadrangles by the Canadian government. The region has some of the oldest rocks in the world and among the oldest in North America, formed from several sections of stable craton continental crust, including the Slave Craton, Rae Craton and Hearne Craton. These rocks form the Archean and Proterozoic Precambrian basement rock of the region and are the subject of extensive research to understand continental crust and tectonic conditions on the early Earth.
Lauren Birgenheier is a geologist and associate professor at the University of Utah. Her fields of expertise include sedimentology and stratigraphy, geochemistry, paleoclimate, petroleum geology, reservoir characterization, and unconventional resources.
Abhijit Mukherjee is an Indian professor, scientist and currently Professor of Geology and Geophysics and the School of Environmental Science and Engineering of IIT Kharagpur. He has been selected for Shanti Swarup Bhatnagar Prize for Science and Technology in 2020 in the field of Earth Atmosphere Ocean and Planetary Sciences.
Retrogressive thaw slumps (RTS), are a type of landslide that occur in the terrestrial Arctic's permafrost region of the circumpolar Northern Hemisphere when an ice-rich section thaws. RTSs develop quickly and can extend across several hectares modifying Arctic coastlines and permafrost terrain. They are the most active and dynamic feature of thermokarst—the collapse of the land surface as ground ice melts. They are thermokarst slope failures due to abrupt thawing of ice-rich permafrost or glaciated terrains. These horseshoe-shaped landslides contribute to the thawing of hectares of permafrost annually and are considered to be one of the most active and dynamic features of thermokarst—the "processes and landforms that involve collapse of the land surface as a result of the melting of ground ice." They are found in permafrost or glaciated regions of the Northern Hemisphere—the Tibetan Plateau, Siberia, from the Himalayas to northern Greenland, and in northern Canada's Northwest Territories (NWT), the Yukon Territories, Nunavut, and Nunavik and in the American state of Alaska. The largest RTS in the world is in Siberia—the Batagaika Crater, also called a "megaslump", is one-kilometre-long and 100 metres (330 ft) deep and it grows a 100 feet (30 m) annually. The land began to sink, and the Batagaika Crater began to form in the 1960s, following clear-cutting of a section of forested area.
Karen H. Johannesson is an American geochemist and professor in the School for the Environment at the University of Massachusetts Boston and the Intercampus Marine Sciences Graduate Program of the University of Massachusetts System. She teaches geochemistry and has expertise in environmental geochemistry, biogeochemistry, trace element speciation, geochemical modeling, chemical hydrogeology, reaction path and reactive transport modeling.
References
- ↑ "Professor Ian Clark: Papers in refereed journals" (list), University of Ottawa, Canada, January 2009, webpage: uO-clark-p Archived 2009-03-07 at the Wayback Machine .
- ↑ "NRSP people: Ian Clark". Natural Resources Stewardship Project. Archived from the original on 2007-03-28. Retrieved 2007-04-10.
- ↑ Martin Durkin (director) (March 8, 2007). The Great Global Warming Swindle (Documentary). United Kingdom: WAGtv Ltd. for Channel 4. Event occurs at 00:35:38-00:35:47 (video clock).
