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In this paper 2D and 3D modeling of thermal evolution of sedimentary cover and OM evolution of the source-rock sequences (SRSs) of the East Siberian Sea were conducted. The distribution of the temperature and reflection of vitrinite in sedimentary cover is presented along the composite seismic profile of the section. Maps of the distribution of the temperature of sedimentary sequences, reflection of vitrinite of the SRSs for various temporal boundaries, and the degree of OM transformation of the SRSs for the presentday stage of evolution were plotted. The evolution of OM maturity and possible processes of hydrocarbon generation of the SRSs were analyzed on the basis of modeling results. 相似文献
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A.N. Didenko V.B. Kaplun Yu.F. Malyshev B.F. Shevchenko 《Russian Geology and Geophysics》2010,51(5):492-506
The lithospheric structure of several marginal and interior units of the eastern Central Asian orogen has been explored in 2D geophysical models. The obtained constraints on effective parameters (density, resistivity, temperature) of lithospheric blocks and their boundaries allowed correlation of geophysical structures to tectonic settings. The geological and geophysical (including paleomagnetic) data were used jointly to model the present structure of the lithosphere along 126° E between 56° N and 40° N and to construct a palinspastic model of the same area for the latest Early Jurassic (175 Ma). 相似文献
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M. V. Goroshko V. B. Kaplun Ya. F. Malyshev N. P. Romanovskiy V. G. Gurovich 《Russian Journal of Pacific Geology》2010,4(4):275-288
Aerogeophysical and gravimetric survey data on the Central Aldan block, Aldan-Stanovoy shield have been summarized; a map
of the extensiveness of the Precambrian granitoid magmatism has been drawn; the association of ore districts encompassing
large deposits with the margins of the extensive areas of Precambrian granitoids has been recognized; the 3-D density modeling
of the lithosphere of this block has been accomplished; the roots of the Mesozoic alkaline massifs down to a depth of 100–150
km have been traced, and the telemagmatic nature of the large gold-uranium deposits related to these massifs has been defined. 相似文献
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Robert Barouki Manolis Kogevinas Karine Audouze Kristine Belesova Ake Bergman Linda Birnbaum Sandra Boekhold Sebastien Denys Celine Desseille Elina Drakvik Howard Frumkin Jeanne Garric Delphine Destoumieux-Garzon Andrew Haines Anke Huss Genon Jensen Spyros Karakitsios Jana Klanova Iida-Maria Koskela Francine Laden Paolo Vineis 《Chemie der Erde / Geochemistry》2010
The outbreak of COVID-19 raised numerous questions on the interactions between the occurrence of new infections, the environment, climate and health. The European Union requested the H2020 HERA project which aims at setting priorities in research on environment, climate and health, to identify relevant research needs regarding Covid-19. The emergence and spread of SARS-CoV-2 appears to be related to urbanization, habitat destruction, live animal trade, intensive livestock farming and global travel. The contribution of climate and air pollution requires additional studies. Importantly, the severity of COVID-19 depends on the interactions between the viral infection, ageing and chronic diseases such as metabolic, respiratory and cardiovascular diseases and obesity which are themselves influenced by environmental stressors. The mechanisms of these interactions deserve additional scrutiny. Both the pandemic and the social response to the disease have elicited an array of behavioural and societal changes that may remain long after the pandemic and that may have long term health effects including on mental health. Recovery plans are currently being discussed or implemented and the environmental and health impacts of those plans are not clearly foreseen. Clearly, COVID-19 will have a long-lasting impact on the environmental health field and will open new research perspectives and policy needs. 相似文献
57.
Luc Denys 《Journal of Paleolimnology》2007,38(1):97-116
Quantitative inference models for water-chemistry variables are derived from epiphytic diatom assemblages in 186 lentic and
mostly shallow freshwaters in lower Belgium (Flanders). When the complete pH range is considered (pH 3.4–9.3), robust transfer
functions are obtained for median pH (jack-knifed r
2 = 0.88, RMSEP = 0.38 pH units or 6.4% of the observed range) and dissolved inorganic carbon concentration (jack-knifed r
2 = 0.86, RMSEP = 0.194 log10 mg DIC l−1 or 10.2% of the observed range) by means of weighted-averaging partial least squares regression (WA-PLS). For these variables,
the calibration models are as reliable as those based on sedimentary diatom assemblages. Inferences of pH may be improved
by combining estimates from epiphytic and sediment assemblages. In circumneutral and alkaline conditions, WA-PLS calibration
of maximum or median total phosphorus is possible (log-transformed; jack-knifed r
2 = 0.64 or 0.66 and RMSEP = 14% or 12.3% of the observed range, respectively). It makes little difference if taxa showing
no response to TP are taken into consideration or not. These models considerably expand the prospects of using historical
herbarium materials to hindcast environmental conditions and also allow more accurate interpretation of current compositional
changes in epiphytic communities. Compared to littoral sediment assemblages, fewer water-column variables can be inferred
reliably from epiphyton. This probably results from differences between the effective gradients in both habitats, together
with lower in situ species diversity and less effective spatial integration (i.e. lower recruitment of phytoplankton) in the
epiphyton. A comparison of the HOF response-model types and WA-optima of diatom taxa for epiphytic and sediment assemblages
shows that the relationship to individual variables, and in particular to those related to trophic status, may differ with
habitat. Thus, the combination of samples from both habitat types in the same calibration model is not recommended.
Electronic Supplementary Material Supplementary material is available and is accessible for authorised users in the online version of this article at 相似文献
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A simple model which describes the soil–pipe interaction and accounts for the longitudinal soil variation has been developed. It is used for the analysis of the static response of a section of a buried sewer. A probabilistic analysis (Monte-Carlo method) enabling to quantify the influence of spatial variability of the geomechanical characteristics of the soil makes possible to study the parameters which can influence and drive the longitudinal response of a section of sewer. The system response is complex, soil–structure interaction depending on three different stiffnesses: soil stiffness, pipe components stiffness and joints stiffness. Various analyses have been performed to identify the parameters whose influence is the larger. A specific attention has been devoted to the fluctuation scale of the soil properties and to the stiffness of joints. 相似文献
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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
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P.Yu. Gornov M.V. Goroshko Yu.F. Malyshev V.Ya. Podgornyi 《Russian Geology and Geophysics》2009,50(5):485-499
We investigate the 2D thermal structure of lithosphere in the Central Asian and Pacific tectonic belts and adjacent cratonic areas of Siberia and North China using a synthesis of geothermal data from six geoscience transects covered by seismic, resistivity, and gravity surveys. The patterns of rock density, radiogenic heat production derived from U and Th abundances, thermal conductivity, temperatures, and respective heat flows reveal a layered structure. The model with layers distinguished according to density and thermal parameters includes well pronounced dome-shaped features in the crust which correlate with upwarps of the asthenospheric top. The domes are marked by high heat flows of 60–90 mW/m2 with a mantle component higher than the crustal one (30–60 mW/m2 against 20–30 mW/m2) and temperatures as high as 800–1100 °C at the Moho. Many of these features correspond to known and potential petroleum basins. 相似文献