Quantification of geodiversity and its loss   总被引：1，自引：0，他引：1  

Dmitry A. Ruban 《Proceedings of the Geologists' Association. Geologists' Association》2010,121(3):326-333

Geodiversity, i.e., a diversity of geological heritage sites, can be quantified with an account of geosite types, type counterparts, and their ranks. Higher numbers of geosite types represented within a given territory and their higher ranks indicate a higher geodiversity. Two additional characteristics, namely geoabundance and georichness, allow measure of the quantity of geosites and the diversity-quantity relationship respectively. Geodiversity loss can be evaluated with an accounting of decreases in geosite type ranks linked to the damage of geosites. A calculation of relative and multi-dimensional geodiversity helps in quantitative assessment of the regional geological heritage.  相似文献   

Basaltic micrometeorites from the Novaya Zemlya glacier     

Dmitry D. BADJUKOV  Franz BRANDSTÄTTER  Jouko RAITALA  Gero KURAT 《Meteoritics & planetary science》2010,45(9):1502-1512

Abstract– A large number of micrometeorites (MMs) was recovered from glacier deposits located at the north‐eastern passive margin of the Novaya Zemlya glacier sheet. Melted, scoriaceous, and unmelted micrometeorites (UMMs) are present. Unmelted micrometeorites are dominated mostly by chondritic matter, but also a few achondritic MMs are present. Here we report the discovery of four UMMs that, according to their texture, mineralogy, and chemistry, are identified as basaltic breccias. Mineral chemistry and Fe/Mn ratios of two basaltic micrometeorites indicate a possible relationship with eucrites and/or mesosiderites, whereas two others seem to have parents, which appear not to be present in our meteorite collections. The basaltic breccia UMMs constitute 0.5% of the total population of the Novaya Zemlya MM suite. This content should be lowered to 0.25% because the Novaya Zemlya MM collection appears to be biased with carbonaceous UMMs being underrepresented.  相似文献   

WSO-UV progress and expectations     

Boris Shustov  Ana I. Gómez de Castro  Mikhail Sachkov  Alexander Moisheev  Evgeny Kanev  Javier López-Santiago  Oleg Malkov  Dmitry Nasonov  G. Belén Perea  Néstor Sánchez  Igor Savanov  Andrey Shugarov  Sergey Sichevskiy  Oleg Vlasenko  Javier Yañez 《Astrophysics and Space Science》2014,354(1):155-161

The World Space Observatory Ultraviolet (WSO-UV) is the space mission that will grant access to the ultraviolet (UV) range in the post Hubble epoch. WSO-UV is equipped with instrumentation for imaging and spectroscopy and it is fully devoted to UV astronomy. In this article, we outline the WSO-UV mission model and present the current status of the project.  相似文献   

Cosmological evolution of statistical system of scalar charged particles     

Yurii Ignat’ev  Alexander Agathonov  Mikhail Mikhailov  Dmitry Ignatyev 《Astrophysics and Space Science》2015,357(1):1-21

  相似文献   

Lochkovian (earliest Devonian) transgressions and regressions along the “Tethyan” margin of Gondwana: A review of lithostratigraphical data     

Dmitry A. Ruban 《Gondwana Research》2011,20(4):739-744

Global sea-level rise and consequent regional transgressions are hypothesized at the beginning of the Devonian. A brief review of lithostratigraphical data available from three regions of the “Tethyan” margin of Gondwana, namely Northern Africa, Arabia, and the Tethys Himalaya, suggests that all of them were characterized by a regressive setting in the Lochkovian. In contrast, data from some terranes of the Greater Galatian Superterrane provide evidence of early Lochkovian transgression. The regressive setting documented on the 'Tethyan' margin of Gondwana differs from the transgressive–regressive cycles of Euramerica and the norm of global sea-level rise followed by a highstand. Only regional tectonic processes including those linked with dynamic topography could explain these differences. These processes may have been associated with syn-rift uplift preceding the opening of the Palaeo-Tethys Ocean, mantle uplift at the supercontinent margin, or the Eo-Variscan orogenic phase.  相似文献   

Mode enslavement in a two-layer stellar dynamo     

David Moss  Dmitry Sokoloff 《Monthly notices of the Royal Astronomical Society》2007,377(4):1597-1604

We consider a conventional stellar  α²ω  -dynamo with dynamo generators localized in two spherical shells separated by a passive layer. The signs of the α-effect as well as rotational shear in the dynamo active layers can be chosen to give dynamo waves that propagate in opposite directions (poleward and equatorward) if the layers are considered separately in the framework of the Parker migratory dynamo. In a sequence of numerical experiments we show that the variety of dynamo-generated magnetic configurations in the system under discussion is quite rich. We identify the possibility of almost independent dynamo waves existing in the two layers as well as enslavement of one layer by the other, and of activity waves generated by a joint action of the two layers. We suggest some qualitative explanations of the behaviour and discuss also the limited nature of these explanations. This variety of phenomena suggests previously underexploited freedoms to understand how predictions of dynamo theory may accommodate the observed solar and stellar activity phenomenology.  相似文献   

Solar Activity Record from Archeomagnetic Data     

Dmitry Volobuev 《Solar physics》2004,224(1-2):387-392

Each of the available solar activity (SA) proxy data (historical notes, radio nuclides ¹⁴C and ¹⁰Be production) are contaminated by their specific noise factors. So, any additional proxy with its independent noise factors will essentially increase the accuracy of composite SA restorations. It is proposed here that archaeomagnetic measurements 95% confidence interval (α₉₅) may serve as new proxy for the SA estimation in the past. This proxy is compared with other available proxies during the years 1500–2000.  相似文献   

Correction to: Accelerated reproduction of 2-D periodic waves     

Chalikov  Dmitry 《Ocean Dynamics》2021,71(4):491-491

Ocean Dynamics - A Correction to this paper has been published: https://doi.org/ https://doi.org/10.1007/s10236-021-01450-3  相似文献   

Were Late Cretaceous extinctions of gastropods selective by generic longevity?     

Dmitry A.Ruban 《地学前缘(英文版)》2013,4(1):87-93

Many gastropod taxa went extinct during the Late Cretaceous.The stratigraphic ranges of 268 genera permit to establish the longevity of extinction victims for each stage of this epoch."Young" taxa (originated within 3 epochs before the extinction) prevailed among victims of the extinctions in all stages.The proportion of "old" taxa(originated before the Cretaceous) that went extinct was the highest in the Cenomanian,and it was the lowest in the Coniacian and the Maastrichtian.It appears that the end-Cretaceous mass extinction affected chiefly "young" taxa.However,the comparison with the earlier time intervals suggests that this pattern of selectivity by generic longevity was not specific for the noted catastrophe,but,in contrast,it was typical for the entire Late Cretaceous.The latest Cenomanian environmental perturbation(OAE2) caused a stronger extinction of "old" taxa,and thus,this biotic crisis was less selective by generic longevity.This hypothesis,however,is not proven by the statistical test.  相似文献   

Integrated geological risk mapping: a qualitative methodology applied in St. Petersburg, Russia     

Johannes Klein  Jaana Jarva  Dmitry Frank-Kamenetsky  Igor Bogatyrev 《Environmental Earth Sciences》2013,70(4):1629-1645

The current active development of the city of St. Petersburg in Russia has led to high growth rates in both industrial and housing areas, causing an increased load on geological media. Taking into account the rather unfavourable geological conditions of the city area, such a development can entail to an intensification of environmental risks. Sustainable and cost-effective land-use planning requires information on geological conditions. Stakeholders need general geological information on the area of St. Petersburg, hydrogeological information on groundwater and information on geological risks. Geological risk maps help to identify whether an area under consideration requires special measures for geological risk management. This paper describes a first attempt to analyze potential geological risks in the city of St. Petersburg, Russia. The approach is to introduce a methodology for multi-risk assessment to be used in land-use planning. The core of the methodology is a matrix that assigns a certain level of geological risk depending on the combination of land use stipulated by the master plan of St. Petersburg and geological characteristics. Based on the matrix, a map presenting potential integrated geological risk can be created. At the same time, the combination of the integrated geological risk map, single geological risk maps and the matrix allows the retracement of which geological characteristics and which land use types contribute to the resulting risk. Users of the methodology in St. Petersburg were trained and an end-user manual was prepared by the authors. The methodology was introduced to professionals who utilize geological information and assess potential risks related to geology.  相似文献