Proceedings of the Estonian Academy of Sciences. Geology最新文献_第3页

Svecofennian metamorphic zones in the basement of Estonia 爱沙尼亚基底的斯韦芬尼变质带

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.2004.3.04

R. Hints, H. Huhma, V. Klein, M. Konsa, R. Kuldkepp, I. Mänttäri, V. Puura, A. Soesoo

引用次数: 11

Stable isotope and pollen stratigraphy in marl sediments from Lake Ilmjärv (central Estonia) 爱沙尼亚中部Ilmjärv湖泥灰岩沉积物的稳定同位素及花粉地层学

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.2002.3.04

J. Punning, T. Koff, T. Martma, Göran Possnert

引用次数: 2

ANDREOLEPIS (ACTINOPTERYGII) IN THE UPPER SILURIAN OF NORTHERN EURASIA 欧亚大陆北部上志留统的Andreolepis(放光蝶属)

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.2001.3.03

T. Märss

引用次数: 31

PITKASOO – A WEST ESTONIAN HOLOCENE REFERENCE SITE Pitkasoo -西爱沙尼亚全新世参考地点

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.1998.4.03

Lars-König Königsson, A. Poska

引用次数: 5

Geological history of Lake Võrtsjärv 湖的地质历史Võrtsjärv

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.2002.3.03

T. Moora, A. Raukas, E. Tavast

引用次数: 7

Precambrian basement of Estonia 爱沙尼亚的前寒武纪基底

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.2004.3.01

A. Soesoo

引用次数: 0

SILURIAN BIOEVENT STUDIES A PART OF THE IGCP PROJECT 216 “GLOBAL BIOLOGICAL EVENTS IN EARTH HISTORY” 志留纪生物事件研究是igcp项目216“地球历史上的全球生物事件”的一部分。

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.1991.2.01

D. Kaljo

{"title":"SILURIAN BIOEVENT STUDIES A PART OF THE IGCP PROJECT 216 “GLOBAL BIOLOGICAL EVENTS IN EARTH HISTORY”","authors":"D. Kaljo","doi":"10.3176/geol.1991.2.01","DOIUrl":"https://doi.org/10.3176/geol.1991.2.01","url":null,"abstract":"exciting old idea of catastrophes (= events) in Earth history, (b) the idea is promising good practical applications for detailed correlation of sections, and (c) high level activity of the project. Speaking about catastrophes, one usually means (mass) extinction events, but innovation, radiation, etc. events are not less interesting. The Silurian was preceded by the well-known late Ordovician glaciation-triggered extinction (O/S Boundary Event) and followed by several events of different scale and origin within the Devonian (a major one, the so-called Kellwasser Event seems to be very instructive for Silurian students as a typical anoxic layer oscillation event with a complex of other factors; Walliser, 1986). In the Silurian A.J. Boucot (1990) Ilisted the following levels at which relatively minor bioevents occurred: Co—Cs boundary (late Llandovery) in the early Wenlock, the late Wenlock, the late Ludlow, and the Silurian-Devonian boundary. Until now these events have gained little attention, but the top Wenlock, the (undgreni event and the following leintwardinensis event were thoroughly described from the aspect of graptolite diversity changes by T. Koren (1987). The first level was earlier known also as the dubius-nassa Interregnum (Jaeger, 1976), which might be called also the nassa-ludensis crisis (Great Crisis H. Jaeger, oral comm.). Ranking of events is rather arbitrary, but exact definition of a level where something happens is important. Otherwise we cannot distinguish whether there was a “big” event or a series of minor ones. For example, when the late Wenlock or Wenlock-Ludlow Boundary or lundgreni event","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131723987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

К ПАЛЕОМАРИНОЛОГИИ КЛИМАТИЧЕСКОГО ОПТИМУМА ГОЛОЦЕНА СЕВЕРО-ЗАПАДНОЙ ЧАСТИ БАРЕНЦЕВА МОРЯ 巴伦茨海西北部的气候光学古生物学

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.1990.2.05

V. Alexeyev, I. Chistyakova, V. Khasankayev, V. Kuleshov, Y. Lavrushin, Y. Spiridonova

引用次数: 0

AUTHIGENIC SILICEOUS MINERALS IN THE TREMADOC GRAPTOLITIC ARGILLITE OF ESTONIA 爱沙尼亚tremadoc笔石泥岩中的自生硅质矿物

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.1995.1.03

A. Loog, V. Petersell

{"title":"AUTHIGENIC SILICEOUS MINERALS IN THE TREMADOC GRAPTOLITIC ARGILLITE OF ESTONIA","authors":"A. Loog, V. Petersell","doi":"10.3176/geol.1995.1.03","DOIUrl":"https://doi.org/10.3176/geol.1995.1.03","url":null,"abstract":"Graptolitic argillite contains in addition to rockforming minerals (hydromicas, chlorite, clastic quartz of pelitic fraction) and accessory minerals also authigenic ones. Numerous clay minerals, carbonates, sulphides, and siliceous minerals are authigenic. Siliceous minerals form lenticular or pocket-shaped laminae on several levels in the eastern part of the distribution area of graptolitic argillite that contains spicules of siliceous sponges and siliceous dioxide. Siliceous dioxide occurs in various forms: as amorphous silicon, opal, chalcedony, and authigenic quartz. Opal may occur in the composition of spicules and partly also of globules. Chalcedony is found as aggregates with a fibrous composition and collomorphic structure. It forms spherulites, bundles, and incrustites around clastic grains and pyrite crystals and on the walls of cavities. There are metacolloidal pellets, plats, and rods of irregular shape among the chalcedonic globules. Edgings and coatings of authigenic quartz are abundant. The siliceous laminae were formed during the early phase of diagenesis. Amorphous silica dioxide was replaced by chalcedony and then by quartz during the diagenesis. Their formation became possible thanks 10 а short-term input of a large amount of silicecous material into the basin. The leaching of silica as colloidal solutions in the denudation area was not sufficient for this. It is supposed that hydrothermae were a source of silicon. The deep origin of silicon is supported by the high content of several typical hydrothermal elements in the siliceous interlayers.","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127558276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

A NEW CONODONT FROM THE LOWER LLANDOVERY OF ESTONIA 来自爱沙尼亚低地的新牙形石

Proceedings of the Estonian Academy of Sciences. Geology Pub Date : 1900-01-01 DOI: 10.3176/geol.1992.1.03

P. Männik

引用次数: 3