Estonian Journal of Earth Sciences最新文献_第10页

Changes in the morphology of Late Ordovician ostracods along the shelf-to-basin transect of the Baltic Palaeobasin 波罗的海古盆地陆架-盆地样带晚奥陶世介形类形态的变化

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2022-01-01 DOI: 10.3176/earth.2022.11

S. Guitor, T. Meidla

引用次数: 0

A bio- and chemostratigraphic search for the Mid-Ludfordian Carbon Isotope Excursion interval in the Ludlow of the Ohesaare core, Estonia 爱沙尼亚Ohesaare岩心Ludlow中ludfordian碳同位素偏移区间的生物和化学地层学研究

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2022-01-01 DOI: 10.3176/earth.2022.04

D. Kaljo, T. Märss, T. Martma, V. Nestor, V. Viira

{"title":"A bio- and chemostratigraphic search for the Mid-Ludfordian Carbon Isotope Excursion interval in the Ludlow of the Ohesaare core, Estonia","authors":"D. Kaljo, T. Märss, T. Martma, V. Nestor, V. Viira","doi":"10.3176/earth.2022.04","DOIUrl":"https://doi.org/10.3176/earth.2022.04","url":null,"abstract":"For years, the Ohesaare core section and its rich fossil assemblages have enticed researchers to suggest various ideas about Silurian stratigraphy in the East Baltic despite several sedimentary gaps occurring through the Ludlow interval in particular. One of the gaps has removed from the Ohesaare record the most important event in the Palaeozoic history of carbon isotopes – the MidLudfordian Carbon Isotope Excursion (MLCIE), which is partly accompanied by the Lau biotic and oceanic events. In our research, we have performed a detailed distribution analysis of chitinozoans, conodonts, ostracodes and vertebrate microremains with the aim of documenting the evidence regarding the levels of certain environmental events largely preceding the MLCIE. For this purpose, the Torgu Formation was subdivided into five working units. The first results indicate a gap within the uppermost part of the Torgu Formation as a possible level for the missing MLCIE. In order to verify this, we compared the fossil distribution pattern in Ohesaare with that on Gotland (Sweden) and in Kurzeme (Latvia), including δ13C data from the Uddvide (Gotland) and Ventspils (Latvia) core sections. Both Baltic and Bohemian data show rather unanimously that the MLCIE is located below the Ozarkodina crispa conodont Biozone. However, some reports from Gotland show peak values also in higher strata; occasional records of Oz. crispa from other places may cast some doubt on these findings and raise some ecostratigraphical concerns when discussing upper Ludfordian correlation.","PeriodicalId":50498,"journal":{"name":"Estonian Journal of Earth Sciences","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74086217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Refraction may redirect waves from multiple directions into a harbour: a case study in the Gulf of Riga, eastern Baltic Sea 折射可以使波浪从多个方向转向港口:波罗的海东部里加湾的一个案例研究

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2022-01-01 DOI: 10.3176/earth.2022.06

R. Männikus, F. Najafzadeh, T. Soomere

引用次数: 3

Neotypes for some upper Silurian acanthodian taxa from the Baltic Sea Region and the Welsh Borderland 波罗的海地区和威尔士边境地区上志留纪棘虫分类群的新类型

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2022-01-01 DOI: 10.3176/earth.2022.02

C. Burrow, T. Märss

引用次数: 1

Late Pleistocene and Holocene groundwater flow history in the Baltic Artesian Basin: a synthesis of numerical models and hydrogeochemical data 波罗的海自流盆地晚更新世和全新世地下水流动史:数值模式和水文地球化学资料的综合

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2021-06-20 DOI: 10.3176/earth.2021.11

W. Aeschbach, C. Gerber, J. Ivask, E. Kaup, J. Lemieux, T. Martma, J. Pärn, R. Purtschert, V. Raidla, A. Sterckx, R. Vaikmäe, L. Vallner

{"title":"Late Pleistocene and Holocene groundwater flow history in the Baltic Artesian Basin: a synthesis of numerical models and hydrogeochemical data","authors":"W. Aeschbach, C. Gerber, J. Ivask, E. Kaup, J. Lemieux, T. Martma, J. Pärn, R. Purtschert, V. Raidla, A. Sterckx, R. Vaikmäe, L. Vallner","doi":"10.3176/earth.2021.11","DOIUrl":"https://doi.org/10.3176/earth.2021.11","url":null,"abstract":"We review our current understanding of groundwater flow history in the northern part of the Baltic Artesian Basin (BAB) from the end of the Late Pleistocene to current conditions based on the hydrogeological studies carried out in 2012–2020 by the Department of Geology, Tallinn University of Technology and its partners. Hydrogeochemical data and various numerical models are combined in order to understand the link between glaciations and groundwater flow. The results of our earlier research and published literature on groundwater flow history in the BAB are also taken into account. The reconstruction of groundwater flow history is based on the database of the isotopic, chemical and dissolved gas composition of groundwater. The database contains data on 1155 groundwater samples collected during 1974–2017. We find that groundwater in the BAB is controlled by the mixing of three distinct water masses: interglacial/modern meteoric water (δ18O ≈ –11‰), glacial meltwater (δ18O ≤ –18‰) and an older syngenetic endmember (δ18O ≥–4.5‰). The numerical modelling has suggested that the preservation of meltwater in the northern part of the BAB is controlled by confining layers and the proximity to the outcrop areas of aquifers. Aquifers containing groundwater of glacial origin are in a transient state with respect to modern topographicallydriven groundwater flow conditions. The most important topics for future research that can address gaps in our current knowledge are also reviewed.","PeriodicalId":50498,"journal":{"name":"Estonian Journal of Earth Sciences","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76270409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Estonian Journal of Earth Sciences turns 70; pp. 1–2 《爱沙尼亚地球科学杂志》迎来70岁生日;1 - 2页。

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2021-01-01 DOI: 10.3176/EARTH.2021.06

O. Hints

引用次数: 0

Miaolingian (Cambrian) trilobite biostratigraphy and carbon isotope chemostratigraphy in the Tingskullen drill core, Öland, Sweden 瑞典Tingskullen岩心庙岭期(寒武系)三叶虫生物地层学与碳同位素化学地层学研究Öland

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2021-01-01 DOI: 10.3176/EARTH.2021.03

P. Ahlberg, M. Calner, P. Dahlqvist, M. Joachimski, O. Lehnert, Frans Lundberg

{"title":"Miaolingian (Cambrian) trilobite biostratigraphy and carbon isotope chemostratigraphy in the Tingskullen drill core, Öland, Sweden","authors":"P. Ahlberg, M. Calner, P. Dahlqvist, M. Joachimski, O. Lehnert, Frans Lundberg","doi":"10.3176/EARTH.2021.03","DOIUrl":"https://doi.org/10.3176/EARTH.2021.03","url":null,"abstract":"The Cambrian succession of the Tingskullen drill core from northern Öland comprises Cambrian Series 2 and Miaolingian (Wuliuan Stage) siliciclastic strata. The major portion of the succession is represented by the Miaolingian Borgholm Formation, which, in ascending order, is subdivided into the Mossberga, Bårstad and Äleklinta members. The Äleklinta Member is barren of body fossils, whereas the Mossberga and Bårstad members are moderately to highly fossiliferous and biostratigraphically reasonably well constrained. Trilobites and agnostoids from the Bårstad Member are indicative of the Acadoparadoxides pinus Zone. The Mossberga Member has not yielded any zonal guide fossils but is tentatively assigned to the Eccaparadoxides insularis Zone. A δCorg curve throughout the Borgholm Formation shows a general positive trend upsection without any distinctive excursion, suggesting that the Wuliuan Acadoparadoxides (Baltoparadoxides) oelandicus Superzone (the ‘Oelandicus beds’) of Öland is younger than the negative Redlichiid–Olenellid Extinction Carbon isotope Excursion (ROECE), which is known from near the top of Stage 4 and close to the traditional ‘Lower–Middle Cambrian boundary’ in several parts of the world.","PeriodicalId":50498,"journal":{"name":"Estonian Journal of Earth Sciences","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72711775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Revision of asterolepidoid antiarch remains from the Ogre Formation (Upper Devonian) of Latvia 拉脱维亚上泥盆统Ogre组星形反拱遗迹的修正

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2021-01-01 DOI: 10.3176/earth.2021.01

E. Lukševičs

引用次数: 2

Three-dimensional slope stability model of the Turaida castle mound 图拉伊达城堡土丘三维边坡稳定性模型

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2021-01-01 DOI: 10.3176/earth.2021.12

K. Kukemilks, M. Vilnītis

引用次数: 0

Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia 巴尔托斯坎迪亚Darriwilian(中奥陶世)可能的后生动物蛋化石

IF 1.1 4区地球科学

Estonian Journal of Earth Sciences Pub Date : 2021-01-01 DOI: 10.3176/earth.2021.16

O. Hints, Y. Liang, J. Nõlvak

引用次数: 1