共查询到20条相似文献，搜索用时 31 毫秒
1.
S. B. Felitsyn 《Lithology and Mineral Resources》2006,41(4):362-370
Low Sr and Ca contents in fine-grained terrigenous rocks of the Vendian sedimentary cover in the East European Platform may be related to the following reasons: (1) the absence of authigenic carbonates in Vendian mudstones owing to desalination of epiplatformal sedimentary basins; (2) significant contribution of the chemically weathered rocks in the formation of the Vendian cover of the East European Platform. 相似文献
2.
3.
V. I. Vinogradov M. I. Bujakaite D. I. Golovin Yu. V. Kushcheva Yu. A. Ivanov V. N. Teslenko O. I. Pashicheva 《Lithology and Mineral Resources》2009,44(2):174-182
Rb-Sr and K-Ar characteristics of Vendian and Upper Riphean sections in various structural units of the East European Platform are studied. It is shown that Neoproterozoic clayey rocks of the platform underwent postsedimentary transformations, primarily owing to processes of K accumulation (illitization). Their intensity decreases with depth and isotopic signatures of provenance rocks are partly retained in Riphean rocks. Stages of the most active transformations approximately 400 and 600 Ma ago are manifested in the Vendian clayey rocks. Events of approximately 1000 Ma ago are recorded in Riphean rocks of the East European Platform. The least altered rocks of the Pachelma aulacogen can retain ancient hydrocarbon pools. 相似文献
4.
S. G. Kovalev V. N. Puchkov S. I. Vysotsky S. S. Kovalev 《Doklady Earth Sciences》2017,475(1):743-747
This work presents new data on the conditions of formation of igneous rocks on the western slope of the Southern Urals and the adjacent part of the East European Platform. Based on the calculated P–T melting parameters of the mantle substrate, it is shown that plume magmatism leads to the formation of similar rocks (picrites and picrite-dolerites), while the genesis of them is quite different. The first type of rocks is a product of crystallization of the undifferentiated mantle-derived melt in the upper horizons of the crust; the rocks of the second type are formed as a result of magma differentiation in large intracrustal magma chambers. 相似文献
5.
S. G. Kovalev V. N. Puchkov S. I. Vysotsky S. S. Kovalev 《Doklady Earth Sciences》2016,471(2):1247-1252
The noble metal (PGE and Au) geochemical specialization of igneous rocks of the Bashkir meganticlinorium and adjacent areas of the East European Platform is characterized for the first time. The identical plots of normalized PGE and Au concentrations of igneous rocks in these regions indicate similar conditions and mechanisms of the formation of the noble metal geochemical specialization during the emplacement of magmatic bodies. It is established that a specific feature of noble metal geochemical specialization (the “rhodium anomaly”) in magmatic complexes of the Bashkir meganticlinorium and eastern areas of the East European Platform is determined by the concentrations of noble metals in sulfide minerals (pentlandite); i.e., it is “primary” in origin. 相似文献
6.
《International Geology Review》2012,54(4):451-457
The area of Eurasia and the shelves of the marginal and internal seas have been sufficiently investigated by geological, geophysical, and drilling means to formulate a number of regional conclusions about the association between various types of tectonic structures and distribution of the petroliferous provinces (basins). This problem has been considered against the background of platforms of different age, the ancient pre-Riphean (East European and Siberian) and the epi-Paleozoic types (West Siberian and West European, and also the South Caspian intrageosynclinal basin). There are significant differences in their geological evolution, which exerted a direct effect on the distribution of the petroliferous complexes. Within the Siberian Platform, the fundamental stages in downwarping were associated with the deposition of Vendian and lower Paleozoic sediments. The principal stages in the formation of the sedimentary cover of the East European Platform were associated with the Devonian, Carboniferous, and Permian periods. For all types of structural zones under consideration, an association has heen established between distribution of oil and gas reserves and episodes of development of major structural elements. They define the overall stratigraphic range of the petroleum occurrences within the young and old platform and the fold regions, and also the concentration of the reserves of hydrocarbons in the complexes corresponding to the principal stages of downwarping of the basins.—Authors 相似文献
7.
E. G. Raevskaya N. A. Volkova I. A. Sivertseva 《Stratigraphy and Geological Correlation》2006,14(4):386-398
Borehole 2506 drilled in the northern area of the Arkhangelsk Oblast penetrated through the Paleozoic sedimentary block isolated in the Vendian thick sequence. A diverse acritarch assemblage has been established within the depth interval of 119.9–217.5 m. The assemblage comprises more than 70 taxa, including species characteristic of the boundary interval between the Volkhov and Kunda horizons of the East European Platform (the graptolite Didymograptus hirundo Zone). Stratigraphic position of host deposits was established within the Darriwilian Stage of the Middle Ordovician. The described assemblage of microphytofossils is similar to coeval assemblages from NW Russia, Baltic region, and Scandinavia, being typical of the Baltic phytoplankton province of temperate latitudes. A great number of species in common suggests that the assemblage under consideration is correlative with coeval assemblages of southern China thus offering a possibility of remote correlation. 相似文献
8.
The available geological data on the Meso-and Neoproterozoic rocks in the north of the East European Platform are considered, involving the results of a comprehensive study along regional seismic profile I-I that extends for 460 km and crosses the main structural units of the Mezen Syneclise from SW to NE. Many previously unknown structural features of aulacogens filled with thick (up to 4–8 km) sequences of the Meso-and Neoproterozoic sedimentary rocks that make up the preplate complex are demonstrated in this profile. The Riphean rocks are subdivided into three seismostratigraphic sequences: the lower part of the Lower Riphean, the Lower-Middle Riphean, and the Upper Riphean. The geodynamic events in the north of the East European Platform are correlated with those that occurred in its central part and the adjacent foldbelts. 相似文献
9.
N. K. Andreeva N. A. Kagramanyan T. N. Kheraskova 《Lithology and Mineral Resources》2000,35(4):373-389
New data on the stratigraphy and composition of the Devonian rocks of the Moscow Syneclise were used. Facies-paleogeographic
schemes were compiled for the Lochkovian, Eifelian, Givetian, early-middle Frasnian, late Frasnian, and early-late Famennian
evolutionary stages of the Moscow Syneclise. Seven sedimentation cycles were developed due to sealevel fluctuations and structural
rearrangements in the paleooceanic basins surrounding the East European Platform at that time. The inference was made on the
structural heterogeneity of the platform basement and on differentiated movements as well as on the strike-slip fault nature
of some fragments of the basement relative to each other in the Devonian. 相似文献
10.
V. N. Podkovyrov A. V. Maslov A. B. Kuznetsov V. B. Ershova 《Stratigraphy and Geological Correlation》2017,25(1):1-20
The results of investigations of Upper Vendian?Lower Cambrian deposits in the northeastern part of the Baltic monocline specify views on the evolution of depositional environments of sedimentary successions constituting the basal part of the sedimentary cover in inner areas of the northwestern East European Platform. It is shown that the Late Vendian and initial Cambrian were characterized by the consecutive influx of relatively mature terrigenous detrital material that originated from both the weathering crust of the Baltic Shield and new sources. Its deposition was interrupted by notable, although likely asynchronous, hiatuses, which are registered at the base of the Upper Vendian Vasileostrovskaya and Voronkovo formations and Lower Cambrian Lomonosov Formation. In the Late Vendian, sedimentary material was transported from the Baltic Shield, while beginning from the initial Early Cambrian the additional contribution to the formation of the sedimentary cover of the Baltic monocline was provided by coarse-grained sedimentary material from the Timan margin of the Baltica as follows from U?Pb isotopic ages obtained for detrital zircons. At the same time, lithogeochemical parameters of fine-grained rocks experienced no substantial changes. 相似文献
11.
《International Geology Review》2012,54(9):1196-1208
Principal unconformities and terminal folding, on the time scale from Belomorian through Caledonian, are correlated tentatively for constituents of the East European Platform (Baltic Shield, Ukrainian Massif, Eastern Margin, and their subordinates), Canadian Shield and Greenland, parts of Great Britain, and northern margin of the African Platform. — IGR Staff. 相似文献
12.
Association of titanium-zirconium placers and phosphate mineralization in Upper Cretaceous rocks of the East European Platform
is shown with the Tsentral’noe (Central) and Unecha deposits as example. This paragenesis is caused by interaction between
the multicomponent placer ore (phosphate-rare metal) concentrations and mechanical-chemical differentiation that shows up
periodically during the sub-aerial migration of sedimentary material. Clastic ore components were mainly derived from intermediate
collectors, while the phosphate material was delivered by the phosphate-containing solutions and particulates in the chemical
weathering crust. Such phosphorite-titanium-zirconium occurrences can also be detected in other regions, including areas with
rare metal placers. 相似文献
13.
Through, long-lived structural-kinematic parageneses were established in the southeastern marginal part of the Baltic Shield on the basis of structural studies. These parageneses were formed and periodically rejuvenated from at least the Paleoproterozoic until the neotectonic stage of the evolution of this territory. A series of consecutive tectonic events related to the vertical and horizontal mobility of rocks of the crystalline basement and sedimentary cover had important implications for the formation of present-day structure of the southeastern margin of the Baltic Shield. These tectonic displacements developed for an extremely long time with retention of the main kinematic tendencies. At the end of the Paleoproterozoic, the volcanic and sedimentary rocks of the Vetreny Belt underwent tectonic stacking as a result of the countermotion of the crystalline masses of the Vodlozero Massif and the Belomorian-Lapland Belt. The clockwise rotation and lateral displacement of the Vodlozero Massif to the northeast provided the left-lateral transpression of the Vetreny Belt. Under these conditions, the Paleoproterozoic sequences experienced squeezing in the southeastern direction. This kinematic tendency was retained at the subsequent evolutional stages and eventually was recorded in the structure of the present-day boundary between the Baltic Shield and the Russian Platform. 相似文献
14.
G. A. Danukalova 《Stratigraphy and Geological Correlation》2010,18(3):331-348
The refined Quaternary stratigraphic scale of the Cisuralian and Bashkortostan regions, approved by the Commission on the
Quaternary System of the Interdepartmental Stratigraphic Committee in 2007, includes the Eopleistocene (with three superhorizons
and seven horizons), Neopleistocene (with three superhorizons and 13 horizons), and Holocene (one horizon and three subhorizons).
The first defined Holocene Agidel Horizon with three subhorizons, the Middle Neopleistocene Klimovka, and the Upper Neopleistocene
Kushnarenkovo Horizon are correlated with the Shuvalov, Gorka, and Mikulino horizons, respectively. New names and reference
sections are proposed for all the Eopleistocene units. Local formations are proposed for the horizons, whose stratotypes are
located in the northern Fore-Urals. The Quaternary stratigraphic scale is correlated with similar scales of the Urals, the
East European Platform, and the Lower Volga region. The scale takes into account all the available data derived from the analysis
of original (sediments, faunal and floral remains), published, and archival materials, which make it possible to trace in
detail the main Quaternary events that occurred in the Fore-Urals. 相似文献
15.
We report the discovery of the oldest evidence for human presence in the southeastern Baltic Sea region. This paper presents an overview of the Riadino‐5 archaeological site in the lower course of the Šešupė River (Kaliningrad Oblast of Russia) and direct infrared stimulated luminescence (IRSL) ages for the culture‐bearing sediments from the site, which place the time of occupation well within the range of Marine Isotope Stage (MIS) 3 (ca 57–26 ka). Luminescence ages were determined using the multiple‐aliquot additive‐dose technique, applied to sand‐sized potassium feldspar. Four of the six IRSL samples from the site come from the cultural deposits, while two are from the surrounding sediments. The luminescence age of the deposits implies that human occupation of the southeastern Baltic Sea region occurred at least between 50 ka and 44 ka during the first half of MIS 3 and the Middle‐Upper Paleolithic. 相似文献
16.
The paper presents data on the distribution of rains during the formation of Carboniferous coal-bearing rocks in the Lvov–Volyn Basin located at the southwestern margin of the East European Platform. They left numerous raindrop imprints that usually occur in the productive Buzhan coal-bearing formation in marginal (repeatedly drained) sectors of maritime lakes, freshened lagoons, bays, and, less commonly, in river floodplains. The raindrop imprints have been recorded for the first time in Carboniferous rocks of the southwestern East European Platform. Their study is of great importance for the interpretation of paleogeographic and paleoclimatic settings. 相似文献
17.
本文基于大量文献资料,系统研究俄罗斯北极地区前寒武纪的岩相古地理。俄罗斯北极地区前寒武纪共识别出半深海-深海区、浅海区、滨海区、冲积区和隆起剥蚀区5种古地理单元,其中,隆起剥蚀区沉积记录缺失;冲积区以砾岩+砂岩+泥岩和变质碎屑岩+碳酸盐岩为主;滨浅海区沉积则以变质碎屑岩+碳酸盐岩、蒸发岩+碳酸盐岩、砂岩+泥岩+碳酸盐岩3种岩性组合为主,局部有蒸发岩、砾岩+砂岩+泥岩发育;而半深海-深海区为大洋。俄罗斯北极地区前寒武纪古地理以滨浅海区为主,主要分布在东西伯利亚台地、西西伯利亚盆地、鄂霍茨克地块、楚科奇板块和巴伦支海北部地区;半深海-深海区的分布仅次于滨浅海区,此时西西伯利亚盆地尚未完全形成,其东侧为半深海-深海区;隆起剥蚀区分布范围小于半深海-深海区,主要分布在波罗的地盾及其周缘地区,以及东西伯利亚台地的阿纳巴尔地块和阿尔丹地盾地区;冲积区分布范围最为局限,仅在蒂曼-柏朝拉盆地中部发育。研究表明,俄罗斯北极地区广泛发育前寒武纪地层,岩性以碳酸盐岩和变质碎屑岩为主,部分构造单元中的前寒武纪地层已成为陆壳基底,前寒武纪岩相古地理特征研究可为前寒武纪地质研究提供依据,为其余地质时期的岩相古地理研究奠定基础。 相似文献
18.
S. B. Felitsyn 《Lithology and Mineral Resources》2006,41(5):417-422
High Au contents in phosphorite concretions and Vendian-Cambrian enclosing shales are attributed to the concentration function of microbial biota of Precambrian epiplatformal basins. Microorganisms and organic detritus served as intermediate collectors of gold delivered with the continental runoff from provenances of the East European Platform. 相似文献
19.
The U–Pb isotope data and corresponding ages of detrital zircons from rocks of the basal complexes of the Uralides of different segments of the Ural Fold Belt are considered. It was established that complexes of ancient domains of the East European Platform (Volga-Uralia, Sarmatia, Kola, etc.) seem to have been the main provenance areas of the clastic material for the Southern, Middle, and Northern Urals. This means that there were relatively remote and local (igneous formations of the pre-Uralides) provenance areas. Rift rock associations of the Uralides of the Subpolar and Polar Urals were formed mainly through erosion of local provenance areas (predominantly, Late Riphean–Vendian island-arc and orogenic magmatic complexes of the Proto-Uralides–Timanides). Detrital zircons of Riphean age dominate in rocks of the basal complexes of the Uralides. A source for them could have been rock complexes of Svecofennian-Norwegian Orogen and Cadomides of the Scythian-Turan Plate, intraplate magmatic formations, and metamorphic complexes, as well as blocks accreted to the margin of the East European Platform in the Late Precambrian–Cambrian and later detached and displaced during the Ordovician rifting and spreading. In general, the basal complexes of Uralides were formed owing to supply of clastic material from both remote and local sources. Despite the appearance of information of a totally new level (U–Pb isotope ages of detrital zircons, their Lu–Hf systematics, and the distribution features of rare earth and trace elements), the contribution of these sources to the formation of the Late Cambrian–Early Ordovician clastic strata is hardly possible at present to evaluate. 相似文献
20.
This article proposes a biostratigraphic scheme for the Upper Cretaceous of the East European Platform on the basis of the distribution in the sections of three groups of microfossils: foraminifera (both planktonic and benthic), radiolarians, and nannoplankton. Most of the stage and substage boundaries are confirmed by macropaleontological data. The most divided units are those distinguished based on benthic foraminifers and nannoplankton. The diversity of these microfossils and their constant presence allowed us to identify zones and subzones, while it is possible to subdivide only the beds by planktonic foraminifers and radiolarians. The most favorable stages in the development of plankton biota can be considered the Turonian–Coniacian interval when the basins of the East European Platform experienced an intensive influence from warm waters of the Tethys Ocean. The global Campanian cooling is clearly recorded, which affected the taxonomic diversity of all microfossil groups. 相似文献