Speciation,Size Fractionation and Transport of Trace Elements in the Continuum Soil Water–Mire–Humic Lake–River–Large Oligotrophic Lake of a Subarctic Watershed     

Svetlana M. Ilina  Sergey A. Lapitskiy  Yuriy V. Alekhin  Jérôme Viers  Marc Benedetti  Oleg S. Pokrovsky 《Aquatic Geochemistry》2016,22(1):65-95

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Tululite,Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36: a new Ca zincate-aluminate from combustion metamorphic marbles,central Jordan     

Hani N. Khoury  Ella V. Sokol  Svetlana N. Kokh  Yurii V. Seryotkin  Elena N. Nigmatulina  Sergei V. Goryainov  Elena V. Belogub  Ian D. Clark 《Mineralogy and Petrology》2016,110(1):125-140

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Transformations of ore minerals in genetically different oceanic ferromanganese rocks     

G. V. Novikov  O. Yu. Bogdanova 《Lithology and Mineral Resources》2007,42(4):303-317

Results of thermic transformations of ore minerals from genetically different oceanic ferromanganese rocks in the course of their heating up to 1000°C are considered. Manganese minerals with various types of crystalline lattice have different grades of thermic stability. Layered manganese minerals (buserite I, asbolane-buserite, and birnessite) are stable up to 120–150°C; asbolane up to 180°C, vernadite, up to ～500°C; todorokite and pyrolusite (minerals of the tunnel group), up to 600 and 670°C, respectively. Sorbed cations of heavy metals govern the transformation temperature and mineral composition of products of the calcination of ferromanganese rocks. Study of birnessite and todorokite demonstrated that genesis of ferromanganese rocks do not affect thermic properties of minerals in them.  相似文献   

A 450-ka long record of glaciation in Northern Mongolia based on studies at Lake Khubsugul: high-resolution reflection seismic data and grain-size variations in cored sediments     

Andrey Petrovich Fedotov  Michael A. Phedorin  Mark De Batist  Galina A. Ziborova  Alexsey Yu Kazansky  Michael Yu Semenov  Galina G. Matasova  Andrey V. Khabuev  Sergey A. Kugakolov  Sergey V. Rodyakin  Svetlana M. Krapivina  Tom Pouls 《Journal of Paleolimnology》2008,39(3):335-348

We use high-resolution reflection seismic data and detailed grain-size analysis of a drill core (KDP-01) from Lake Khubsugul (northern Mongolia) to provide an improved reconstruction of the glacial history of the area for the last 450 ka. Grain-size analysis of suspended sediment load in modern rivers draining into the lake and of moraine material from the northern part of the catchment shows that the silt fraction is transported to the central part of the lake mainly by river suspension, whereas the clay fraction is mainly transported by glacial meltwater during deglaciation. The changes in of the clay/silt ratio in Lake Khubsugul sediments correlates well with the standard global paleoclimate records: low clay/silt ratios indicate warm climates, while a high clay/silt ratio reflects glacial erosion and cold climates. Pulses of clay input into the lake occur at the final stages of glacial periods (i.e., glacial maxima and subsequent onsets of deglaciation). The periodicity in glacial clay input in Lake Khubsugul is in tune with global periods of deglaciation, but there are differences in the intensity of the deglacial events for MIS-12 and MIS-2. These differences are attributed to specific conditions in regional distribution of moisture during glaciation, glacial ice volumes, and solar insolation intensity at the onset of deglaciation. Deglaciation of the Khubsugul glaciers occurred in response to an increase in summer solar insolation above a threshold value of 490 W/m². Two types of deglaciation can be distinguished: (1) slow melting during several tens of 1,000 years during weak increases in summer insolation, and (2) short and fast melting during several thousands of years in response to strong increases in summer insolation. The maximum ice volume in the area of Lake Khubsugul during the past 450 ka occurred during the period of 373–350 ka BP (MIS 11a-10) and was caused by high levels of moisture in the region, whereas the MIS-2 and MIS-12 glacial periods were characterized by minima in ice volume, due to the strong aridity in the region.  相似文献   

New Data on the Paleoproterozoic Age of Metamorphism in the Yelabuga Deformation Zone of Volgo-Uralia,East European Craton     

Fedotova  A. A.  Bogdanova  S. V.  Claesson  S.  Anosova  M. O.  Postnikov  A. V.  Fugzan  M. M.  Kirnozova  T. I. 《Doklady Earth Sciences》2019,488(1):1123-1127

Doklady Earth Sciences - This data on the age of metamorphism of rocks of the Yelabuga zone and the geochronological data on detrital zircon from paragneisses of the same zone are presented, and...  相似文献   

Seismic activity and deep conductivity structure of the Eastern Carpathians     

Svetlana Kováčiková  Igor Logvinov  Andriy Nazarevych  Lesya Nazarevych  Josef Pek  Victor Tarasov  Pavel Kalenda 《Studia Geophysica et Geodaetica》2016,60(2):280-296

We present results of a study of the seismicity and the geoelectric structure of the Eastern Carpathians. After the evaluation of the seismicity, new methods of processing and analyzing seismic data are developed, which allow constructing an averaged horizontal-layered velocity model of the crust in the Carpathian region of Ukraine, tracing the seismic active faults and localizing the seismic events both in horizontal and in vertical direction with a better precision. For the study of the conductivity structure beneath the Eastern Carpathians, the collected magnetovariation and magnetotelluric data are used. The depth of electrical conductivity anomalies are estimated and the resulting quasi-3D model of the conductivity structure beneath the Carpathians is compared with the seismicity in the depth range of 10 ± 2.5 km. The comparison suggests possible geological mechanisms: the seismic events occur mainly in resistive solid rock domains which surround aseismic high-conductivity zones, consisting of at least partially melted material. Aqueous fluids, or a joint effect of several mechanisms, may also play an active role in this distribution.  相似文献   

An updated and unified earthquake catalogue for the Western Balkan Region   总被引：1，自引：0，他引：1  

Snježana Markušić  Zeynep Gülerce  Neki Kuka  Llambro Duni  Ines Ivančić  Slavica Radovanović  Branislav Glavatović  Zoran Milutinović  Sinan Akkar  Svetlana Kovačević  Jadranka Mihaljević  Radmila Šalić 《Bulletin of Earthquake Engineering》2016,14(2):321-343

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不同森林生态系统对全球气候变化和经济活动响应的比较分析（英文）     

Svetlana Dorzhievna PUNTSUKOVA  Bair Octyabrevich GOMBOEV  Margarita Ramilievna AKHMETZYANOVA  Tsogtbatar JAMSRAN  Tsendesuren DAGDAN  董锁成 《资源与生态学报(英文版)》2015,6(2):106-109

本文对俄罗斯、蒙古和中国范围气候变化对不同生态系统(寒带、热带)空气记录分布的影响进行研究,并将这些生态系统对全球气候变化的响应进行比较分析,其中空气记录来自研究范围的关键区域。研究发现,森林生态系统对气候变化具有一定的响应。伴随着气候变化,社会经济活动对生态系统的影响显著。研究结果表明,气候驱动力和人类直接影响对森林和草原生态系统如何施加影响有待进一步研究。  相似文献   

统计地震学的两个基本定律对应力的依赖关系     

Clément Narteau  Peter Shebalin  左玉玲 《国际地震动态》2010,(3):11-17

统计地震学长期使用的两个幂律关系式为:描述地震频度-震级关系的古登堡-里克特(Gutenberg-Richter)关系式[1]和描绘主震后余震随时间衰减速率特征的大森-宇津(Omori-Utsu)定律[2]。最近,地震频度-震级关系斜率(b值)与断裂模式的相关性研究确定了应力对b值的影响[3]。在此,我们以类似的方式根据主震的断裂模式对余震序列进行研究。我们发现逆冲型主震的幂律余震衰减速率起始前的延时(c值)一般比正断层型地震的短,走滑型地震的c值则处于二者之间。对断裂模式的这些类似依赖关系表明两个基本幂律都受应力状态控制。只有2%的余震有已知震源机制解。因此,c值和b值是两个独立的估算值,它们可作为推断应力场的新方法来使用,目前应力场依然难以直接测定。  相似文献   

Unique desert caves as a valuable geological resource: first detailed geological heritage assessment of the Sannur Cave,Egypt     

Sallam  Emad S.  Ruban  Dmitry A.  Mostafa  Moataz T.  Elkhodery  Menna Kh.  Alwilily  Rufida L.  Molchanova  Tatyana K.  Zorina  Svetlana O. 《Arabian Journal of Geosciences》2020,13(3):1-11

Arabian Journal of Geosciences - Surface albedo is a key parameter in earth energy budget and global climate change studies. In this aspect, variation in vegetation covers is one of the most...  相似文献