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Now showing items 61-80 of 161
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(2002)The alignment of olivine crystals is considered as the dominant source of seismic anisotropy in the subcrustal lithosphere and asthenosphere. Different components of large-scale anisotropy can be traced in depth distributions ...
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(1987)The melanocratic rock association considered represents the basement of the outer part of the Northwest Pacific paleo-oceanic fringe. It is confined to the zone where oceanic crustal complexes taper among crystalline rock ...
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(1988)The East Sayan fold system, including northeastern Tuva, is confined to the southwest rim of the Siberian craton and acquired its present structure chiefly in the early Caledonian (Salairian) epoch. The most interesting ...
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(2003)Microbial sulfate reduction is thought to stimulate carbonate precipitation in modern stromatolites, yet whether this metabolism was important in shaping Precambrian stromatolites is unknown. Here we use geochemical modeling ...
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(1989)We investigated a geologically complex deposit in the Eastern Sayan region. It is confined to a steeply dipping (80°) shale-carbonate member that is inferred to be of Riphaean age and is sandwiched between Paleozoic granite ...
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(2003)Highly magnesian volcanics (komatiites, picrites, and Mg-rich basalts) are most abundant in Precambrian complexes. Their parental magmas were generated through high to maximum degrees of melting of the mantle. Hence, it ...
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(1988)Our petrologic and geochemical study of the Archean Goran group in the southwestern Pamirs has revealed the wide extent of cordierite rocks formed after magnesite. Geologic and petrographic criteria clearly indicate that ...
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(2004)Isolation of the Nuristan-South Pamir mineragenic province comprising metamorphogenic gem deposits is based in the limits of outcrops of Precambrian metamorphic sequences. The formation of the deposits was analyzed on the ...
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(2001)Biotite is the most used 40Ar-39Ar geochronometer yet two significant problems arise from Ar-Ar step-heating. Dating altered biotite can be problematic, producing disturbed age spectra that reflect 39Ar recoil. However, ...
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(1999)Mylonitic rocks associated with the south-dipping detachment fault of the Yagan Onch Hayrhan metamorphic core complex in southernmost Mongolia indicate subhorizontal south-southeast directed extension in the Early Cretaceous; ...
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(2001)The Precambrian-Cambrian (PC-C) boundary separates fossils representing two discrete evolutionary phases: the Neoproterozoic soft-bodied Ediacarian biotas and Cambrian small shelly faunas. The biological discontinuity is ...
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(1990)In detailed petrographic studies of the high-alumina rocks (garnet-sillimanite-cordierite-biotite-plagioclase-quartz schists and gneisses) that are widely developed in the oldest (more than 3.7 Ba), Upper Aldan group of ...
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(1981)At present there is considerable speculation concerning the origin of greenstone belts. They are compared with Phanerozoic geosynclines, fold belts, modern island arcs or with the rift structures formed above subduction ...
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(1988)Morphostructural nodes - specific mosaic structures, formed at the intersections of morphostructural lineaments, are extreme manifestations of recent block activity in mountain areas. The existence of a structurally and ...
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(1980)Review of the distribution of the U.S.S.R. Upper Precambrian stromatolites in time and space demonstrates an unrepeated and unidirectional change of their assemblages along with distinct lateral differentiation of the ...
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(2001)Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the Middle Archean to younger Precambrian, and continuously throughout the Phanerozoic. This class of gold deposit ...
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(1995)High-Mg volcanic rocks from the ca. 250 Ma old Siberian Flood Basalt Province (SFBP) were analyzed for their osmium and neodymium isotopic compositions in order to help to constrain source characteristics as the system ...
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(1999)Oxygen isotope fractionations have been measured experimentally between dissolved orthophosphate ions H2PO4- and water from 50°C to 135°C. The derived equilibrium fractionation equation reveals that biogenic apatites are ...
Now showing items 61-80 of 161