Tectonochemistry of the Brooks Range Ophiolite, Alaska
نویسندگان
چکیده
منابع مشابه
Tectonic evolution of the Brooks Range ophiolite, northern Alaska"
Analysis of internal structures of the Brooks Range ophiolite at the three largest and well-exposed klippen reveals a NE-SW structural grain that may parallel the original axis of magmatism of a slow spreading marginal ocean basin. Sub-parallel directions of lattice·fabrics in olivine of mantle peridotite and shape fabrics in pyroxene and plagioclase of layered gabbro indicate that asthenospher...
متن کاملOrigin and tectonic evolution ofthe metamorphic sole beneath the Brooks Range ophiolite, Alaska
Structural field relations, petrologic and geochemical studies, and radiometric age aualysis of metamorphic rocks at the base of the Brooks Range ophiolite provide a record of the time, tectonic setting, and initial conditions of ophiolite emplacement during the Middle Jurassic western Brookian orogeny. The metamorphic sole of the Misheguk, Siniktanneyak, and Avan Hills ophiolite bodies is tran...
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Cryoturbation in permafrost-affected soils is important to many Arctic biogeochemical processes and critical to the appropriate classification of Gelisols. Standardized methodologies for describing the soils formed from these processes and knowledge regarding the time scales at which they operate continue to evolve. Twenty-six profiles were described across a transect in the Midas Lake region o...
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Carbon dioxide efflux and soil microenvironmental factors were measured diurnally in Carex aquatilusand Eriophorum angustifolium-dominated riparian tundra communities to determine the relative importance of soil environmental factors controlling ecosystem carbon dioxide exchange with the atmosphere. Measurements were made weekly between 18 June and 24 July 1990. Diurnal patterns in carbon dioxi...
متن کاملAn oxygen-isotope record of Holocene climate change in the south-central Brooks Range, Alaska
Understanding the ecological and socio-economic impacts of climatic warming requires knowledge of associated changes in moisture balance. Reconstructions of Holocene moisture-balance variation offer indispensible baseline information against which recent changes can be evaluated. We analyzed Charastem encrustations in the sediments of Takahula Lake, located in the south-central Brooks Range of ...
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ژورنال
عنوان ژورنال: Lithosphere
سال: 2020
ISSN: 1947-4253,1941-8264
DOI: 10.2113/2020/7866789