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1.
Jean Labasse 《GeoJournal》1991,2(1):61-64
Since a 1921 law the harnessing of the Rhône River from Lyon to the Mediterranean has been directed by a national company composed of the public sector (fromthe valley) as well as of various consumers or distributors of current such as the SNCF or the EDF. This company, the National Company of the Rhône (CNR), was a precursor to the establishment of the TVA in the United States, although it did not begin operations until aftetr the TVA due to prolonged technical negotiations and to the difficulties involved in locating financial support in a period of economic crisis. Even though the utilization of hydraulic power constitutes the prime aim of the CNR, it has also focused on navigation, irration and other agricultural uses from the outset.This article will not further discuss the hydro-electric stations on the Rhône which usually supply more than 22% of French hydro-electric output from thirteen stations now in operation (total power is 2,350 MW and annual average output is 13,000 GWh). This paper will treat the question of the nature and importance of the side effects of the harnessing of the Rhône apart from its essential energy function. 相似文献
2.
L. G. Bragina 《Stratigraphy and Geological Correlation》2016,24(2):141-166
A scheme of radiolarian zonal subdivision is proposed for the upper Albian–Santonian of the Tethyan regions of Eurasia. The upper Albian contains one zone: Crolanium triangulare; the Cenomanian contains three zones: Patellula spica (lower Cenomanian), Pseudoaulophacus lenticulatus (middle Cenomanian), and Triactoma parva (upper Cenomanian); the Turonian contains four zones: Acanthocircus tympanum (lower Turonian (with no upper part)), Patellula selbukhraensis (upper part of the lower Turonian), Phaseliforma turovi (middle Turonian (with no upper part)), and Actinomma (?) belbekense (upper part of the middle Turonian–upper Turonian); the Coniacian contains two zones: Alievium praegallowayi (lower part of the Coniacian) and Cyprodictyomitra longa (upper part of the Coniacian); the Santonian contains three zones: Theocampe urna (lower Santonian), Crucella robusta (middle Santonian–lower part of the upper(?) Santonian), and Afens perapediensis (upper part of the upper Santonian). The biostratigraphic subdivisions are correlated with biostrata in the schemes proposed previously for the Tethys and Pacific. A new species Patellula selbukhraensis Bragina sp. nov. is described. 相似文献
3.
YU Wen 《《地质学报》英文版》2014,88(4):1262-1287
Yangtzeconus priscus-Archaeospira ornata, an important earliest Cambrian benthonic Assemblage of the Yangtze micromolluscan fauna, occurs mainly in the Lower Cambrian Zhongyicun and Dahai Members of the Yuhucun Formation in E Yunnan, the Tianzhushan Member （=Huangshandong Member） of the Dengying Formation in W Hubei and the Maidiping Member of the Hungchunping Formation in C Sichuan, China. About 90% of the genera of this Assemblage are unknown from the Nemakit-Daldynian and Tommotian molluscan Assemblages of the Siberian Platform, Russia. About 90% of the Siberian molluscan genera do not occur in the Zhongyicun and Dahai Members in the Meishucun section and in the corresponding beds of the Yangtze Platform, because the Tommotian molluscan Assemblage is characterizedly abundant archaeocyathids. It is clearly indicated that the Yangtze and Siberian molluscan Assemblages represent different bio- and lithofacies and ages. The age of the pre-trilobitic Yangtzeconus priscus-Archaeospira ornata Assemblage is older than that of the Nemakit-Daldynian and Tommotian molluscan Assemblages and referable to the Earliest Cambrian. Two new genera Mcnamaraconus and Zhangwentangoconus are herein proposed. 相似文献
4.
Belyaev Yu. R. Panin A. V. Kiryuhina A. D. Koshurnikov A. V. Kramynin A. M. Pavlov M. A. Konstantinov E. A. Kurbanov R. N. Zakharov A. L. Sychev N. V. 《Doklady Earth Sciences》2022,506(1):S84-S93
Doklady Earth Sciences - A complex of works including geomorphological deciphering, field survey, drilling, electric prospecting, and dating of deposits using the radiocarbon method and optically... 相似文献
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Comparative analysis of the composition and formation conditions of the dunite–pyroxenite association of the Guli Pluton and ultramafic vulcanite (meimechite) showed the similarity of their initial melts and the same type of crystallization, demonstrating the cumulative origin of dunite. 相似文献
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Doklady Earth Sciences - 相似文献
8.
The littoral fringe ranging between the capes of Bizerte and Ras Ettarf (north-eastern of Tunisia) represents an unstable
and complex system of the Tunisian littoral. The instability of this zone is dependent, on one hand, on natural phenomena
contributing to the destabilization of certain sectors to which are added the induced effects of anthropic factors on the
other hand. This study was carried out from grain size analysis and a simulation of swell plans. This led the authors to highlight
the increasing grain size classification from the zones of the Capes towards the sandy low coasts and to quantify the moved
volumes under the effect of the dominant swells in order to simulate the fattening and erosion zones in this sector. A littoral
transit of direction north–south is able to transport 45,000 m3/year of sediment which are participating in the fattening of the beach of Sidi Salem; 6,000 m3/year of sandy sediments are directed towards the beach of R'mel and 12,000 m3/year are participating in the fattening of the beaches of Chatt Mami (Ras Jebel) and Lahmmari (Raf Raf). 相似文献
9.
《矿物岩石地球化学通报》2007,26(2):207-208
The French Society of Mineralogy and Crystallography is honoured to be invited to give a short presentation of its activity to the Chinese Society for Mineralogy,Petrology and Geochemistry.BRIEF HISTORY AND SOME FRENCH FOUNDERS OF MINERALOGY 相似文献
10.
《Russian Geology and Geophysics》2014,55(7):881-891
The paper presents the results of detailed paleomagnetic studies of the Paleogene-Neogene continental sediments stripped by borehole 8 in southwestern West Siberia (Russkaya Polyana district, Omsk Region), near the Kazakhstan frontier. According to the previous biostratigraphic data, the sediments under study formed from Rupelian to Ruscinian. The results of stepwise thermal demagnetization and alternating-field demagnetization were used to carry out a component analysis of natural remanent magnetization, which revealed characteristic (primary) remanent magnetization (ChRM). The compiled paleomagnetic section, which includes seven regional horizons and same-named formations (Oligocene Atlym, Novomikhailovka, and Zhuravka Formations and Neogene Abrosimovka, Beshcheul, Tavolzhan, and Novaya Stanitsa Formations), was compared with the Cenozoic polarity scale for the West Siberian Plate. This made it possible to assess the completeness of the geologic section of the Paleogene and Neogene continental sediments in borehole 8 and to record the magnetozones and their fragments missing from the magnetostratigraphic section (for some intervals, in absolute chronology). The comparison shows that the magnetostratigraphic section of the studied sediments at the edges of the Om’ basin is approximately twice shorter than that of the basin center. 相似文献
11.
Z. G. Badredinov B. A. Markovskii E. A. Nozdrachev I. V. Matyushkin I. V. Grinkevich 《Doklady Earth Sciences》2017,476(1):973-977
U–Pb SHRIMP dating of zircons from metamorphic rocks of the crystalline basement of the Omolon-Taigonos area (northeastern margins of Asia) has been used to determine the periods of early endogenic activity of the crust. These periods correlate to the time of formation of the magmatic rock protolith (3.2–3.3 Ga), the stage of regional metamorphism (2.6–2.8 Ga), and the superimposed granitization. The resulting data can be used to reconstruct the history of development of the crust in the Precambrian. 相似文献
12.
H. Z. Abidin R. J. Davies M. A. Kusuma H. Andreas T. Deguchi 《Environmental Geology》2009,57(4):833-844
Global positioning system (GPS) and satellite-based InSAR (Interferometric Synthetic Aperture Radar) measurements of the subsidence
and uplift of a populated area of Sidoarjo, East Java are due to the eruption of the Lusi mud volcano (2006–present). These
data are the first direct quantitative measurements of deformation due to the growth of a mud volcano edifice. The GPS data
were recorded over periods of a few hours to several months and show that between June 2006 and September 2007, the earth’s
surface has been subsiding at rates of 0.1–4 cm/day. Maximum rates of subsidence occurred in an area 300–400 m to the northwest
of the main mud volcano vent. Horizontal displacements were 0.03–0.9 cm/day and were also towards this area. In general uplifts
of up to 0.09 cm/day were recorded in areas outside of the edifice. Changes in elevation measured using satellite imagery
(InSAR technique) provide regional datasets of subsidence and uplift. They confirm that during the first year a roughly circular
area was undergoing sag-like subsidence centered to the northwest of the main vent and that uplift was occurring 3–4 months
after the initiation of the eruption due to the movement Watukosek fault system. Subsidence occurred due to the weight of
mud and man-made dams and the collapse of the overburden due to removal of mud from the subsurface. Assuming constant rates
of subsidence of 4 cm/day, then in the centre of the edifice there would be up to 44 m of subsidence in 3 years, and up to
16 m in 10 years. The mud volcano is now in a self-organizing state with new fluid conduits forming as a result of the collapse.
An erratum to this article can be found at 相似文献
13.
The results of bio- and lithostratigraphic studies of the Givetian-Frasnian rocks in the Tsil’ma River basin are reported. They suggest regularities in sedimentation: distinct rhythmicity and similar succession in the structure of formations. We have identified five palynocomplexes that characterize the formations and make it possible to accomplish a confident biostratigraphic subdivision of sections. Their correlation with coeval complexes in the adjacent areas has been accomplished. The results made it possible to unravel specific features of miospore assemblages formed in the continental and coastal-marine facies. 相似文献
14.
A. M. Mazukabzov A. M. Stanevich D. P. Gladkochub T. V. Donskaya V. B. Khubanov Z. L. Motova T. A. Kornilova 《Doklady Earth Sciences》2018,478(2):171-174
The geological position, composition, and age of detrital zircons of sedimentary deposits of the Nugan Formation of the Western Baikal region underlying the Golousta Formation of the Baikal series of Ediacaran age have been studied. The formation of both stratigraphic units due to the same sources of detrital material, located within the southern flank of the Siberian Craton, has been proved. The deposits of the Nugan Formation have been demonstrated to mark the rifting stage of the formation of the passive margin of the Paleo-Asiatic Ocean: their accumulation occurred in the Late Cryogenian during the interval 720–640 Ma. 相似文献
15.
V. V. Mitta Yu. N. Savelieva A. A. Feodorova O. V. Shurekova 《Stratigraphy and Geological Correlation》2017,25(6):607-626
The study of ammonites from the upper part of the upper Bajocian and lower part of the lower Bathonian in the sections of the basin of the Bolshoi Zelenchuk (Karachay-Cherkessia) allowed the recognition of Beds with Parkinsonia djanelidzei (approximate equivalent of the middle part of the Parkinsonia parkinsoni Chronozone) and Beds with Oraniceras scythicum (lower part of the Zigzagiceras zigzag Chronozone). The taxonomic composition and distribution of foraminifers, ostracodes, dinoflagellate cysts, and miospores were studied in the samples from these deposits (upper part of the upper member of Djangura Formation). The recognized characteristic assemblages of microfauna and palynomorphs allowed ostracode and dinocyst subdivisions to be proposed for the Bajocian–Bathonian boundary beds of the Northern Caucasus for the first time. The most important taxa, including ammonites, foraminifers, ostracodes, and dinocysts, are illustrated. 相似文献
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Doklady Earth Sciences - The evolution of the stress–strain state of the Earth’s crust in Southern California during the preparation period (from January 1, 2019 until August 15, 2019)... 相似文献
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The Precambrian Belomorian mobile belt located between the Karelian craton and the Lapland–Umba granulite belt contains large amount of small rootless mafic–ultramafic intrusions, which are dispersed over a large area and distinguished as the Belomorian drusite (coronite) complex. U-Pb dating of magmatic zircon and metamorphic rutile from the drusite body on Vorony Island showed that it was crystallized at 2460 ± 11 Ma and metamorphosed at 1775 ± 45 Ma. Petrographic and geochemical data confirm that the parental magmas of the drusites belong to the siliceous high-magnesian (boninite-like) series, which also was responsible for the formation of large layered plutons in stable domains of the Baltic Shield. 相似文献
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Shatsky V. S. Skuzovatov S. Yu. Ragozin A. L. Dril S. I. 《Doklady Earth Sciences》2018,479(1):408-411
Doklady Earth Sciences - In the present paper, the results of our isotope–geochemical studies on eclogites of the ultrahighpressure metamorphic complex of the Kokchetav massif are reported.... 相似文献