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Now showing items 41-60 of 156
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(2002)Carbonatites in the western Transbaikalia rift area have a mid-Early Cretaceous age (130-120 Ma) and comprise lavas, tuffs, dikes, and veins, which are commonly associated with alkaline and subalkaline gabbroids and syenites. ...
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(2004)Geotectonic reconstructions and the Rb-Hf-Ta relationship data on granitoids suggest that granitoids of the upper Amur region are products of the collision of the Amur Superterrane with the Siberian Craton. Late Jurassic-Early ...
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(2002)Magmatic activity occurred in the Dzhida sector of the Western Transbaikalia rift zone from the Late Jurassic throughout the Early Cretaceous. The time interval of 159-100 Ma was marked by at least six pulses of magmatic ...
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(1989)Knowing the lead-isotope composition of potassic feldspars in ore-bearing intrusions should show whether or not endogene ore mineralization is genetically related to them and many sometimes allow their age to be estimated ...
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(1996)We studied Lower Jurassic (Pliensbachian-Toarcian) basalts and tuffs and Middle Jurassic (Bajocian) limestones and marls from 9 sites in the southern part of the Lesser Caucasus (ca. 39.3°N, 45.4°E). A component showing ...
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(1983)Linear extensional rift and rift-like structures have been generated many times during various periods of the Earth's history since early times. These structures have varied with time, however, in scale, morphology, ...
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(1988)Metallogenesis of manganese in space and time is reviewed here in the light of the progressive development of the atmosphere, the hydrosphere and the lithosphere attendant with the varied styles of tectonism. Economic ...
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(2002)A hierarchy of sequence stratigraphic subdivisions is suggested for the Late Jurassic – Cretaceous deposits of the Songliao basin based on the results of seismic survey and also holes and outcrops. A ...
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(2001)The Chubachin Massif in the central part of the Dzhugdzhur-Stanovoi foldbelt is dominated by biotite and biotite-muscovite granites and belongs to the Tukuringra Complex, which is traditionally considered to be Early ...
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(2004)The Yagan area of the southernmost Sino–Mongolian border is characterized by an extensional structure where a large metamorphic core complex (Yagan–Onch Hayrhan) and voluminous granitoids are exposed. New isotopic age data ...
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(1999)Mesozoic island-arc and oceanic volcanic-sedimentary complexes were sampled at eight localities at the Taigonos Peninsula on the northern coast of the Sea of Okhotsk. Out of more than 250 samples, most proved to be completely ...
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(1999)The specific features of the Central-Asian orogenic belt (CAOB) and marginal structures of the North-Asian craton are considered on the basis of analysis of lithospheric-plate tectonics and terrain analysis. The general ...
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(2001)The Transbaikal Region and eastern Mongolia were influenced by intensive tectonic and magmatic activity in the Late Mesozoic. This activity was accompanied by hydrothermal deposition of various predominantly lithophilic ...
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(1996)The Inagli complex, one ot several Mesozoic intrusive complexes of the Aldan Shield (Siberian Platform), exhibits a concentric structure comprising several alkaline ultramafic rock-types. A central dunite body is surrounded ...
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(2000)Clay-mineral, heavy-mineral, and elemental distributions in sediments from the Arctic Ocean and the adjacent Laptev and Kara seas can be attributed to the geology of the hinterland and the transport of terrigenous material ...
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(1988)Rocks of the lamproite series, like kimberlites, are products of very deep processes and extreme enrichment of the upper mantle. They are now being studied far more widely because of diamond finds in lamproites of Australia. ...
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(2004)The Taihang-Da Hinggan Mountains Tectonomagmatic Belt is the Mesozoic magmaeric activities concentrating area in eastern China, which passes through the two tectonic units of the North China Craton and the Inn Mongolian ...
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(1990)There is little information about pre-Late Paleozoic volcanism in Siberia because the corresponding volcanic systems were largely eroded during the Mesozoic. However, by studying the few volcanic bodies now known and ...
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(1990)The presence of igneous rocks of mafic composition (diabases and dolerites) in the caprock of the Seregovo salt dome, about 75 km north of Syktyvkar, in a platform region with a large area of Mesozoic-Cenozoic sedimentary ...
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(1988)The high-pressure rock association in one area of Sakhalin is described. Within the area studied, the high-pressure association forms a sublatitudinally oriented zone, 300 to 500 m wide and composed mainly of alternating ...
Now showing items 41-60 of 156