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Now showing items 109-128 of 39124
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(1999)Following accretion of southern Siberian microcontinents to the Siberian craton in the Early Paleozoic, five cycles of K-rich silicic magmatism, progressively decaying in volume, occurred on batholithic scales throughout ...
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(1996)Hydrothermal bulk-loss experiments employing radiogenic Ar (4°Ar*) were performed to determine whether 40 Ar* diffusivity in biotite increases with Fe content. Diffusion laws determined for intermediate and Fe-rich biotite ...
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(1997)Five of six samples representing the entire stratigraphic sequence (∼3700 m thick) of basaltic flows in the Noril'sk section in the northwestern part of Siberian flood basalt province, Russia yield 40Ar–39Ar plateau ages ...
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(1995)Volcanic and intrusive rocks of the Chegem caldera and the nearby Eldjurta (Eldzhurtinskiy) Granite record a late Pliocene episode of silicic magmatism in the north-central Caucasus Mountains. Surface exposures, created ...
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(2006)Twenty-one 2-4 mm rock samples from the Apollo 12 regolith were analyzed by the 40Ar/39Ar geochronological technique in order to further constrain the age and source of nonmare materials at the Apollo 12 site. Among the ...
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(1999)The Multiple Diffusion Domain (MDD) theory of Ar loss, based on the 40Ar/39Ar method, has been used to obtain thermal histories, over tens of millions of years, in the range 500 °C to near-surface temperatures, of alkali ...
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(1999)West of the Main Uralian fault, the main suture in the southern Urals, 40Ar/39Ar apparent ages of amphibole, muscovite and potassium feldspar are interpreted as cooling ages. A fast exhumation of the metamorphic complex ...
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(Томский политехнический университет, 2019)Актуальность исследования обусловлена необходимостью расширения ресурсной базы полезных ископаемых, в том числе и золота. Крупные ареалы щелочного магматизма, такие как Алдано-Становой щит, представляют особый интерес, так ...
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(2005)В статье представлены новые изотопно-геохронологические данные для мезозойских магматических образований Хингано-Олонойской вулканической зоны Хингано-Охотского вулканического пояса, полученные 40Аr/39Аr методом, а также ...
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(1998)We report depth profiles of the cosmogenic radionuclides 10Be, 26Al, and 41Ca in the titanium-rich lunar basalt 74275. The 10Be profile is flat: 10Be activities are confined to a narrow range between 9.6 and 11.2 dpm/kg ...
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(Минералогический музей им. А.Е. Ферсмана РАН (Москва), 2015)Статья посвящена очередной, 47-й, выставке Общества любителей камня при Московском обществе испытателей природы (МОИП) «Удивительное в камне», которая была организована в Минералогическом музее им. А.Е. Ферсмана РАН. Описаны ...
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(2004)Using classical diffusion theory, we present a mathematical technique for the determination of 4He concentration profiles in minerals. This approach should prove useful for constraining the low-temperature cooling histories ...
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(2002)5-n-Alkylresorcinols with alkyl chain lengths varying from C19 to C25 were identified solely in bog-forming plant species classified as sedges (Eriophorum vaginatum, E. angustifolium, Trichophorum cespitosum and Rhynchospora ...
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(PANGAEA, 2017-11-29)The heavy and light mineral composition of two fraction (63-125, 125-250 µm) from ca. 50 permafrost samples were studied in order to classify different stratigraphical stages.
Now showing items 109-128 of 39124