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741.
The physical significance of a negative correlation between a varve record from Mud Lake, British Columbia, and temperature
is discussed in the context of a process-network. The process-network is defined as the system of temporally and spatially
connected processes involved in the transfer of a signal from climate to varved glaciolacustrine sediment. The six systems
defining the network include climate, glacier, fluvial, geomorphic, terrestrial biologic and lacustrine systems to which each
process belongs. A literature review outlines significant variation in the strength and character of correlations between
components of the process-network and highlights that more comprehensive interpretations of varves as a hydroclimatic proxy
require an improved understanding of the process-network. Documenting each process in the network is integral to informing
a more complete model of this system, identifying processes that constitute signal transfer and assessing hydroclimatic proxies
based on linear correlation. Such documentation is of growing importance as varved lacustrine sediments are increasingly used
as a hydroclimatic proxy. The complex nature of the process-network requires greater emphasis on interdisciplinary cooperation
and alternative methods to the linear statistical model. 相似文献
742.
743.
H.V. Warren S.J. Horsky A. Kruckeberg G.H.N. Towers J.E. Armstrong 《Journal of Geochemical Exploration》1983,18(3):169-173
Summary of biogeochemical prospecting for mercury mineralization in the Pinchi Fault is given. One thousand two hundred and eight plant samples were collected and analyzed for mercury. In mineralized areas the typical mercury content of dried plants was not less than 0.2 and 0.4 μg/g and even concentrations between 0.6 and 1.6 μg/g were observed. In nonmineralized zones at least 90% of the plants contained no more than 0.15 μg/g of mercury. Analytical and sampling procedures are described. 相似文献
744.
The angular variation of elastic and inelastic scattering cross-sections has been calculated and used to study the energy deposition by precipitating electrons with the help of Monte Carlo Method. Monoenergetic, power law electron spectrum with isotropic and monodinational incidence starting at an altitude of 300 km have been used to obtain the angular and energy distributions at certain height intervals. In these calculations constant magnetic field has been used. 相似文献
745.
Coal pebbles found in 1994 in the Greham Bell Island (Franz Josef Land Archipelago) are made up of the Barzas-type cuticular liptobiolith. The coal belongs to the initial stage of catagenesis and is characterized by high content of cutinite (up to 70%) with very low reflectance (Ro= 0.1%). Maceration products show some tegillate elements of Arthropodaand individual Devonian spores. It is supposed that plant cuticle and Arthropoda exocuticle are present in this coal. The obtained data suggest the presence of Paleozoic rocks in the sedimentary sequence, although they are not yet recovered. These data complement the available information on the distribution of specific Devonian coals and allow us to have a new insight into the zoogenic material involved in the coal formation. 相似文献
746.
Lithology and Mineral Resources - 相似文献
747.
Rocket-borne observations of the extinction of solar hydrogen Lyman-alpha radiation made during the solar eclipses of 20 May 1966 at Karistos for normal and 44% visibility and of 7 March 1970 at East Quoddy for normal, 10% and 0.6% visibility have been used to study the variation of temperature in the mesosphere during these events. It is seen that near the mesopause the decrease of temperature at Karistos is by 20° K for 44% visibility and at East Quoddy by 100° K for 0.6% visibility. Possible causes of these temperature variationsvis-a-vis molecular oxygen and pressure variations have been briefly discussed. 相似文献
748.
Geotectonics - Synthesis of the results of U–Pb dating of detrital zircons (dZr) from the Uppermost Precambrian–Phanerozoic strata of the southern and southeastern framing of the East... 相似文献
749.
R. R. Gabdullin N. V. Badulina E. A. Bakai E. V. Rubtsova A. Yu. Yurchenko E. V. Karpova A. V. Ivanov M. A. Varzanova A. V. Sergienko T. A. Konovalova M. V. Parakhina 《Moscow University Geology Bulletin》2018,73(4):346-360
The composition and origin of the Callovian–Oxfordian deposits of the Sudak Bay were characterized on the basis of the generalization and analysis of our own results, as well as published and unpublished data. The botanical future was first implemented for the geological mapping of the Oxfordian deposits. 相似文献
750.