Browsing by Subject "zircon"
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Browsing by Subject "zircon"
Now showing items 1-20 of 23
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(2003)The Jormua ophiolite represents seafloor from an Early Proterozoic ocean to continent transition zone that mainly consisted of Archean subcontinental lithospheric mantle. These mantle rocks were exhumed as a result of ...
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(2002)A calcite - amphibole - clinopyroxene rock (CAPR) occurs as branching veins and segregations in ultramafic alkaline lithologies of the Afrikanda complex, Kola Peninsula, in Russia. The rock is composed predominantly of ...
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(2001)Measurements of oxygen isotope fractionations between coexisting igneous titanite (Ttn) and zircon (Zrc) have been used to formulate a self-consistent, empirical calibration of equilibrium oxygen isotope partitioning: 1000 ...
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(2003)A huge fluorite deposit at Voznesenka in the Khanka massif, Far East Russia is concluded to have formed at ca. 450 Ma in Late Ordovician time based on the K-Ar ages for Li-micas in the fluorite ore and greisenized leucogranite ...
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(2002)Clinozoisite gneisses were studied from the Barchi-Kol area, located 17 km to the west of the Kumdy-Kol microdiamond deposit at Kokchetav massif (Northern Kazakhstan). As distinct from the deposit, the studied rocks are ...
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(2002)The macroscopic behaviour of minerals is not always directly related to their crystalline structure at the atomic scale but often depends explicitly on mesoscopic (nanometer–micrometer) features. This paper reviews various ...
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(2001)Processes of mineral alteration involving the mobilization and deposition of more than 30 chemical elements during bauxite formation and epigenesis have been studied on specimens from the Devonian Schugorsk bauxite deposit, ...
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(2004)For more than 100 years mineralogists, physicists, chemists, geologists, and biologists have discussed the formation of periodic Liesegang patterns observed in natural and experimental systems. Spectacular examples of ...
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(2004)In situ observations of the zircon-reidite transition in ZrSiO4 were carried out using a multianvil high-pressure apparatus and synchrotron radiation. The phase boundary between zircon and reidite was determined to be P ...
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(2002)Lower crustal garnet granulite xenoliths from beneath the Kola-Karelian domain of the Fennoscandian Shield (Russia) were brought to the surface in Devonian lamprophyre diatremes. To establish the relationships between ...
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(2003)The widespread distribution of zircon in the continental crust, its tendency to concentrate trace elements, particularly lanthanides and actinides, its use in age-dating, and its resistance to chemical and physical degradation ...
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(2004)147Sm–143Nd and 146Sm–142Nd systems were studied in nineteen 3.32–4.02 Ga zircon grains from Jack Hills metaconglomerate, 12 of which were previously analyzed for Lu–Hf. Nd concentrations in the zircons are 0.9–20 ppm.The ...
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THE DYNAMIC PROPERTIES OF ZIRCON STUDIED BY SINGLE-CRYSTAL X-RAY DIFFRACTION AND RAMAN SPECTROSCOPY (2001)An investigation of the dynamic properties of synthetic non-metamict zircon, ZrSiO4, was undertake n using X-ray single-crystal diffraction and polarized single-crystal Raman spectroscopy. The X-ray results at room temperature ...
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(2002)Ophiolitic rocks with a zircon age of ∼1020 Ma occur in the Dunzhugur complex of East Sayan, Siberia, and are part of a Neoproterozoic to early Palaeozoic segment of the Central Asian fold belt. The most spectacular suite ...
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(2001)The most profound biotic crisis in the Earth’s history, causing the near extinction of both terrestrial and marine life, occurred at the end of the Permian period about 253 Myr ago and marks the Paleozoic–Mesozoic era ...
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(2001)The bedrock of the Sodankylä schist area consists mainly of Paleoproterozoic volcanic and sedimentary rocks penetrated by mafic and felsic intrusives. This paper reports c. 200 conventional U-Pb analyses mainly on zircon. ...
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U-Pb ДАТИРОВАНИЕ ЦИРКОНОВ ИЗ АЛЛЮВИЯ РЕК И ВТОРИЧНЫХ КОЛЛЕКТОРОВ ЯКУТСКОЙ АЛМАЗОНОСНОЙ ПРОВИНЦИИ (Федеральное государственное унитарное предприятие «Центральный научно-исследовательский геологоразведочный институт цветных и благородных металлов», 2019)На арктических территориях Якутии известно много россыпей с высокими содержаниями алмазов, но коренные источники последних до сих пор неизвестны, поэтому остро стоит проблема коренной алмазоносности Якутской Арктики. ...
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(2004)(U-Th)/He chronometry of zircon has a wide range of potential applications including thermochronometry, provided the temperature sensitivity (e.g., closure temperature) of the system be accurately constrained. We have ...
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(Томский политехнический университет, 2017)Актуальность проведенных исследований определяется необходимостью уточнения абсолютного возраста и изучения петрологии, геохимии и оруденения гранитоидов Точильного штока Горного Алтая, который представлен сильно ...
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(Федеральное государственное бюджетное учреждение науки Кольский научный центр Российской академии наук, 2014)Доизучение основных редкоземельных элементов (REE) в месторождениях и проявлениях Мурманской области показало, что первоочередные объекты для технологоэкономической оценки извлечения REE – хибинские апатитовые месторождения; ...
Now showing items 1-20 of 23