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1.
E. G. Ivolga V. G. Gurovich N. P. Romanovsky Yu. O. Manilov 《Russian Journal of Pacific Geology》2016,10(5):351-364
Petrophysical characteristics are determined for the rock complexes of the Okhotsk margin within the continent–ocean transition zone. Petrophysical maps showing the major inhomogeneities of the main tectonic elements of the studied area are constructed. Petrophysical inhomogeneities and the corresponding geophysical field anomalies are compared. A relationship between the magnetic field anomalies and subsurface rock complexes is revealed. The gravity field anomalies are related to deep inhomogeneities and are almost independent of the subsurface rock complexes of relatively low thickness. 相似文献
2.
Agustín G. Martinelli Alberto C. Garrido Analía M. Forasiepi Ernesto R. Paz Yamila Gurovich 《Gondwana Research》2007,11(4):537-552
In this contribution, we describe an association of fossil remains collected in the locality of Cerro de Los Leones, approximately 8 km southwest of the town of Picún Leufú, Neuquén Province, Argentina, from different levels of the Albian Cullín Grande Member, Lohan Cura Formation. The fossils include pelecypodan (Neocorbicula dinosauriorum, Neocorbicula pehuenchensis, and genus indet.) and gastropodan (Physa wichmanni) molluscs, a mesoeucrocodylian, possible pterosaurs, theropods, and sauropods. The sedimentary environment at Cerro de los Leones is characterized by fluvial deposits corresponding to a sandy meandering fluvial system. The most fossiliferous levels (located in the lower part of the exposed sequence) were developed in a distal flood plain and flood basin areas. Sedimentological and paleopedological features suggest semi-arid conditions during the deposition of the Cullín Grande Member. Despite the fragmentary nature of the specimens described here, the new information provided from the Albian assemblages of the Lohan Cura Formation at the Cerro de Los Leones locality provides a broader panorama of the composition of terrestrial faunas during the Early Cretaceous in Patagonia. 相似文献
3.
S. M. Rodionov A. A. Schnaider N. P. Romanovsky V. G. Gurovich 《Geology of Ore Deposits》2007,49(4):285-296
The molybdenum mineralization at the Tigriny tin deposit is considered for the first time in the light of possible recovery of Mo as a by-product of selective mining. It is established that Mo has a positive correlation with Bi and does not show a correlation with Sn, W, or Zn. The highest Mo grade (>0.1%) in the ore stockwork is related to hornfels near the exposed granite porphyry stock and decreases downward by an order of magnitude. At the level of adit 5, the most numerous quartz-molybdenite veinlets develop at a distance of 50–100 m from the granite porphyry stock. The molybdenite-quartz, pegmatoid, and autogreisen generations of molybdenum mineralization are related to different substages of the first ore stage. All these generations predated crystallization of wolframite, cassiterite, and other ore minerals. The formation temperature for each molybdenite generation was determined by homogenization of fluid inclusions in quartz and decrepitation of samples characterizing each molybdenite-bearing assemblage. These data allowed us not only to estimate the crystallization temperature of each molybdenite generation but also to establish that the molybdenite crystallized from a pneumatolytic-hydrothermal melt-solution at the early stage of the deposit formation. The molybdenum mineralization is genetically related to the granite porphyry stock. The structure of the quartz-molybdenum stockwork was studied to determine the clusters of quartz-molybdenite veinlets and establish their orientation. Molybdenite 1 occurs in variably oriented veinlets that make up a stockwork around the apical portion of the porphyry stock. Disseminations and pockets of molybdenites 2 and 3 are hosted in pegmatoid rocks, greisen, and greisenized granite porphyry. The density of the Tigriny stockwork varies from 0 to 40–50 quartz-molybdenite veinlets per 5 m. Their orientation and spatial distribution were studied in quantitative terms. The most promising targets for selective mining of molybdenite from the Tigriny deposit are the framework of the Minor porphyry stock and the apical portion of the Main stock. The Tigriny deposit demonstrates a clear relationship between ore formation and granitic magmatism. 相似文献
4.
Christiaan P. A. van Buchem Yamila Miguel Mantas Zilinskas Wim van Westrenen 《Meteoritics & planetary science》2023,58(8):1149-1161
To date, over 500 short-period rocky planets with equilibrium temperatures above 1500 K have been discovered. Such planets are expected to support magma oceans, providing a direct interface between the interior and the atmosphere. This provides a unique opportunity to gain insight into their interior compositions through atmospheric observations. A key process in doing such work is the vapor outgassing from the lava surface. LavAtmos is an open-source code that calculates the equilibrium chemical composition of vapor above a dry melt for a given composition and temperature. Results show that the produced output is in good agreement with the partial pressures obtained from experimental laboratory data as well as with other similar codes from literature. LavAtmos allows for the modeling of vaporization of a wide range of different mantle compositions of hot rocky exoplanets. In combination with atmospheric chemistry codes, this enables the characterization of interior compositions through atmospheric signatures. 相似文献
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6.
E. G. Ivolga N. P. Romanovskii V. G. Gurovich Yu. F. Manilov 《Russian Journal of Pacific Geology》2013,7(5):358-367
A gravity field interpretation is performed for the North Sikhote-Alin and North Sakhalin fold structures junction area using the COSCAD-3D software package, and petrodensity and petromagnetic maps are compiled, thus making it possible to obtain new data on the petrophysical features and the deep structure of the area under study. As a result of the complex geophysical and petrophysical data’s interpretation, a sketch map of the disjunctive tectonics is compiled and the circular structure featuring a unique rock fill caused by the influence exerted by the mantle’s deep structure is identified and can be considered as a magma chamber structure with the center being in the North Sakhalin Bay. 相似文献
7.
Georgina V. Coldwell Diego G. Lambas Ilona K. Söchting Sebastián Gurovich 《Monthly notices of the Royal Astronomical Society》2009,399(1):88-96
We analyse the relation between active galactic nuclei (AGN) host properties and large-scale environment for a representative red and blue AGN host galaxy sample selected from the Data Release 4 Sloan Digital Sky Survey. A comparison is made with two carefully constructed control samples of non-active galaxies, covering the same redshift range and colour baseline. The cross-correlation functions show that the density distribution of neighbours is almost identical for blue galaxies, either active or non-active. Although active red galaxies inhabit environments less dense compared to non-active red galaxies, both reside in environments considerably denser than those of blue hosts. Moreover, the radial density profile of AGN relative to galaxy group centres is less concentrated than galaxies. This is particularly evident when comparing red AGN and non-active galaxies.
The properties of the neighbouring galaxies of blue and red AGN and non active galaxies reflect this effect. While the neighbourhood of the blue samples is indistinguishable, the red AGN environs show an excess of blue-star-forming galaxies with respect to their non-active counterpart. On the other hand, the active and non-active blue systems have similar environments but markedly different morphological distributions, showing an excess of blue early-type AGN, which are argued to be late-stage mergers. This comparison reveals that the observable differences between active red and blue host galaxy properties including star formation history and AGN activity depends on the environment within which the galaxies form and evolve. 相似文献
The properties of the neighbouring galaxies of blue and red AGN and non active galaxies reflect this effect. While the neighbourhood of the blue samples is indistinguishable, the red AGN environs show an excess of blue-star-forming galaxies with respect to their non-active counterpart. On the other hand, the active and non-active blue systems have similar environments but markedly different morphological distributions, showing an excess of blue early-type AGN, which are argued to be late-stage mergers. This comparison reveals that the observable differences between active red and blue host galaxy properties including star formation history and AGN activity depends on the environment within which the galaxies form and evolve. 相似文献
8.
O. I. Wong E. V. Ryan-Weber D. A. Garcia-Appadoo R. L. Webster L. Staveley-Smith M. A. Zwaan M. J. Meyer D. G. Barnes V. A. Kilborn R. Bhathal W. J. G. de Blok M. J. Disney M. T. Doyle M. J. Drinkwater R. D. Ekers K. C. Freeman B. K. Gibson S. Gurovich J. Harnett P. A. Henning H. Jerjen M. J. Kesteven P. M. Knezek B. S. Koribalski S. Mader M. Marquarding R. F. Minchin J. O'Brien M. E. Putman S. D. Ryder E. M. Sadler J. Stevens I. M. Stewart F. Stootman M. Waugh 《Monthly notices of the Royal Astronomical Society》2006,371(4):1855-1864
9.
Yu. F. Malyshev M. V. Goroshko V. B. Kaplun N. P. Romanovsky V. G. Gurovich 《Russian Journal of Pacific Geology》2012,6(4):263-274
The geophysical survey data were summarized, the magnetotelluric sounding along the Zeya water reservoir??the Algama River profile was conducted, and the Bomnak mantle plume structure was distinguished for the first time. The areas prospective for ores were defined and substantiated. 相似文献
10.
N. P. Romanovsky Yu. F. Malyshev M. V. Goroshko V. G. Gurovich M. I. Kopylov 《Russian Journal of Pacific Geology》2009,3(4):338-355
Materials pertaining to Mesozoic granitoids in the Central Asian and Pacific Belts junction area and the adjacent platforms are summarized. Maps of the location of massifs, the extensiveness of granitoid magmatism, the manifestations of Mesozoic plumes, and the relief of the asthenosphere surface have been compiled. The locations of the major ore deposits are plotted on the maps. The distribution chart has been constructed for these deposits in the coordinates of the crust and lithosphere. The depth of the occurrence of the sources for large and superlarge gold, tin, polymetallic, molybdenum, tungsten, and uranium deposits has been estimated. Areas showing promise for the discovery of large deposits are defined. 相似文献