Bulletin of the Geological Society of Finland最新文献_第9页

Mid- and late-Holocene shoreline changes along the southern coast of the Gulf of Finland 芬兰湾南海岸中、晚全新世海岸线的变化

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2013-06-01 DOI: 10.17741/BGSF/85.1.002

I. Grudzinska, L. Saarse, J. Vassiljev, A. Heinsalu

{"title":"Mid- and late-Holocene shoreline changes along the southern coast of the Gulf of Finland","authors":"I. Grudzinska, L. Saarse, J. Vassiljev, A. Heinsalu","doi":"10.17741/BGSF/85.1.002","DOIUrl":"https://doi.org/10.17741/BGSF/85.1.002","url":null,"abstract":"In response to glacio-isostatic rebound in Estonia, a relative sea level fall occurred during the midand late-Holocene, and as a result, lowland regions in northern Estonia have experienced an evolution from sea to land. The midand late-Holocene shoreline changes along the southern coast of the Gulf of Finland were reconstructed, using litho-, bioand chronostratigraphical proxies from four lakes. The lakes are located within the Gulf of Finland drainage system at different altitudes between 18 and 4 m above the present sea level. The isolation from the sea and the onset of freshwater lacustrine sedimentation occurred in Tänavjärv basin at 5400 cal yr BP, in Klooga basin at 4200 cal yr BP, in Lohja basin at 2200 cal yr BP and in Käsmu basin at 1800 cal yr BP. Through the application of GIS-based analysis, a modern digital terrain model and reconstructed past water level surfaces, we present a series of scenarios of shoreline and palaeogeography changes occurring since 7800 cal yr BP. The land uplift rate, which was approximately 2.8 mm yr-1 7800 cal yr BP in the surroundings of Tänavjärv, has decreased to 2.2 mm yr-1 at present and that at Lohja from 2.4 to ca 2.0 mm yr-1, respectively. The relative sea level curves show a land uplift decrease, which is nearly linear since the mid-Holocene.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":"85 1","pages":"19-34"},"PeriodicalIF":0.7,"publicationDate":"2013-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630204","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: 16

Analysis of relationships between near-shore hydrodynamics and sediment movement on Osmussaar Island, western Estonia 爱沙尼亚西部Osmussaar岛近岸水动力与沉积物运动关系分析

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2013-06-01 DOI: 10.17741/BGSF/85.1.003

Ü. Suursaar, H. Tõnisson, A. Kont, K. Orviku

{"title":"Analysis of relationships between near-shore hydrodynamics and sediment movement on Osmussaar Island, western Estonia","authors":"Ü. Suursaar, H. Tõnisson, A. Kont, K. Orviku","doi":"10.17741/BGSF/85.1.003","DOIUrl":"https://doi.org/10.17741/BGSF/85.1.003","url":null,"abstract":"Based on field studies, hydro-meteorological data and wave hindcasts, coastal developments and their hydrodynamic forcing conditions are studied on the limestone relict island of Osmussaar. Areal growth of Osmussaar Island, which emerged from the Baltic Sea 2000–3000 years ago and has grown ever since, has practically stopped as the current global sea level rise nearly balances out the local isostatic post-glacial uplift; yet it continues on the southern shores of the island as a result of gradual accumulation of the matter eroded by waves from the north-westerly exposed Osmussaar cliff and the submarine limestone bench in front of it. Based on analysis of old maps, photographical material, and levelling surveys from coastal study sites on Osmussaar, the island as a whole is slowly migrating to the south-east. Compared to the 1960s and 1970s, the rate of coastal changes has increased from 0.2 m2 y-1 to 1.2 m2 y-1 per shoreline meter. A painted sediment experiment conducted in 2011 revealed the nearshore feeding zones for beach ridges. Storminess and high sea level events have increased on the windward, westerly exposed coast. Wave climate has undergone some cyclical changes with the last high phase in the 1990s and a new cycle probably started again 2010.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":"85 1","pages":"35-52"},"PeriodicalIF":0.7,"publicationDate":"2013-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630257","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: 10

Potential structures for CO 2 geological storage in the Baltic Sea: Case study offshore Latvia 波罗的海二氧化碳地质储存的潜在结构:拉脱维亚近海的案例研究

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2013-06-01 DOI: 10.17741/BGSF/85.1.005

K. Shogenov, A. Shogenova, O. Vizika-kavvadias

{"title":"Potential structures for CO 2 geological storage in the Baltic Sea: Case study offshore Latvia","authors":"K. Shogenov, A. Shogenova, O. Vizika-kavvadias","doi":"10.17741/BGSF/85.1.005","DOIUrl":"https://doi.org/10.17741/BGSF/85.1.005","url":null,"abstract":"This study is focused on two structures in the Baltic offshore region (E6 and E7 structures in Latvia) prospective for the geological storage of carbon dioxide (CO2). Their CO2 storage capacities were estimated recently with different levels of reliability. Petrophysical, geophysical, mineralogical and geochemical parameters of reservoir rocks represented by quartz sandstones of the Deimena Formation of Middle Cambrian in two wells and properties of Silurian and Ordovician cap rocks were additionally studied and interpreted in the present contribution. Extended methodology on rock measurements and estimation of conservative and optimistic storage capacity are presented. Uncertainties and risks of CO2 storage in the offshore structure E6 estimated as the most prospective for CO2 geological storage in the Baltic Region, and the largest among all onshore and offshore structures studied in Latvia, were discussed. We re-estimated the previous optimistic capacity of the E6 structure (265–630 Mt) to 251–602 Mt. Considering fault system within the E6 structure we estimated capacity of two compartments of the reservoir separately (E6-A and E6-B). Estimated by the optimistic approach CO2 storage capacity of the E6-A part was 243–582 Mt (mean 365 Mt) and E6-B part 8–20 Mt (mean 12 Mt). Conservative capacity was 97–233 Mt (mean 146 Mt) in the E6-A, and 4–10 Mt (mean 6 Mt) in the E6-B. The conservative average capacity of the E6-B part was in the same range as this capacity in the E7 structure (6 and 7 Mt respectively). The total capacity of the two structures E6 and E7, estimated using the optimistic approach was on average 411 Mt, and using the conservative approach, 159 Mt.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":"85 1","pages":"65-81"},"PeriodicalIF":0.7,"publicationDate":"2013-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630457","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: 5

Reconstruction of the Dead (Grey) Dune evolution along the Curonian Spit, Southeastern Baltic 波罗的海东南部库尔斯沙嘴沿线死(灰)沙丘演变的重建

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2013-06-01 DOI: 10.17741/BGSF/85.1.004

N. Dobrotin, A. Bitinas, D. Michelevičius, A. Damušytė, J. Mažeika

引用次数: 20

The Petäjäskoski Formation, a new lithostratigraphic unit in the Paleoproterozoic Peräpohja Belt, northern Finland 芬兰北部古元古代Peräpohja带一个新的岩石地层单元Petäjäskoski组

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2012-12-01 DOI: 10.17741/BGSF/84.2.001

Markus Kyläkoski, E. Hanski, H. Huhma

引用次数: 30

Temporal and Hf isotope geochemical evolution of southern Finnish Lapland from 2.77 Ga to 1.76 Ga 芬兰南部拉普兰2.77 ~ 1.76 Ga时间和Hf同位素地球化学演化

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2012-12-01 DOI: 10.17741/BGSF/84.2.002

L. Lauri, T. Andersen, J. Räsänen, H. Juopperi

{"title":"Temporal and Hf isotope geochemical evolution of southern Finnish Lapland from 2.77 Ga to 1.76 Ga","authors":"L. Lauri, T. Andersen, J. Räsänen, H. Juopperi","doi":"10.17741/BGSF/84.2.002","DOIUrl":"https://doi.org/10.17741/BGSF/84.2.002","url":null,"abstract":"The southern Finnish Lapland area in the central part of the Fennoscandian shield is a geologically complex zone comprising several Archean blocks and Paleoproterozoic supracrustal belts all of which are intruded by voluminous Paleoproterozoic granites (the central Lapland granitoid complex, CLGC). New in-situ single crystal zircon U–Pb age determinations coupled with Lu–Hf isotope data from the same zircons were acquired from five granitoid rocks and one amphibolitic rock sample from the southern Lapland area. The samples represent at least four distinct magmatic events (at ca. 2.77 Ga, 2.12 Ga, 1.81 Ga, and 1.76 Ga). The 2.77 Ga and the 1.81-1.76 Ga events have initial Hf isotope signatures implying that local Archean rocks represent the source for the younger granites. The 2.12 Ga event has a slightly more juvenile Hf isotope composition suggesting either that the source for the 2.12 Ga granites represents a different Archean block or that the source is composed of mixed Archean and Paleoproterozoic components. The Neoarchean source for the Paleoproterozoic granites may be traced through the CLGC all the way to the Jokkmokk area in Sweden and possibly to the Lofoten area in Norway.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":"84 1","pages":"121-140"},"PeriodicalIF":0.7,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630490","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: 21

Natural stone deposits in an assemblage of subhorizontal intrusions - The Kuru granite batholith 亚水平侵入组合中的天然石矿床。库鲁花岗岩基

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2012-12-01 DOI: 10.17741/BGSF/84.2.004

O. Selonen, C. Ehlers, P. Härmä, R. Nyman

引用次数: 5

Preglacial geomorphology of the northern Baltic Lowland and the Valdai Hills, north-western Russia 波罗的海低地北部和俄罗斯西北部瓦尔代丘陵的冰期前地貌

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2012-06-01 DOI: 10.17741/BGSF/84.1.005

A. Y. Krotova-Putintseva, V. R. Verbitskiy

引用次数: 5

On the deglaciation chronology of the Palivere ice-marginal zone, northern Estonia 爱沙尼亚北部帕利维尔冰缘带的消冰年代学研究

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2012-06-01 DOI: 10.17741/BGSF/84.1.002

L. Saarse, A. Heinsalu, S. Veski, L. Amon, Andrejus Gaidamavičius

引用次数: 8

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2012-06-01 DOI: 10.17741/BGSF/84.1.004

P. Sarala, K. Lamsters

{"title":"Drumlins and related glaciogenic landforms of the Madliena Tilted plain, Central Latvian Lowland","authors":"P. Sarala, K. Lamsters","doi":"10.17741/BGSF/84.1.004","DOIUrl":"https://doi.org/10.17741/BGSF/84.1.004","url":null,"abstract":"Bulletin of the Geological Society of Finland, Vol. 84, 2012, pp 45–57 This paper presents new results on the morphometry and spatial distribution of the glaciogenic landforms and ice flow directions in the Madliena Tilted Plain that occupies the eastern part of the Central Latvian Lowland. Landforms were investigated by using topographic maps at scales of 1:25 000 and 1:10 000. There were identified and mapped 1461 glaciogenic landforms such as drumlins, end moraine ridges, eskers, ribbed moraines, marginal ridges, lateral shear margin moraines and recessional formations. Particular attention is given to the morphometry, spatial distribution, and the internal structure of drumlins. Glacial landscape of the study area was formed by the Zemgale ice lobe in course of deglaciation of the Late Weichselian Fennoscandian Ice Sheet, when the ice decay was interrupted by the reactivation of the Middle Lithuanian and the North Lithuanian glacial phases at the end of the Oldest Dryas (18–15 ka BP). The detailed study of the internal structure of the Brenceni drumlin suggests that it consists of glaciotectonically disturbed glacio-aquatic sediments and of a single till thrust sheet between sand sediments on the flank of the drumlin. Morphometric analysis of the drumlin field shows that the mean length of drumlins is about 850 m; the mean width indicates the average size 280 m, and the mean elongation ratio is 3.0. The obtained statistics compared to the morphometry of drumlins worldwide, show close similarity, so it coincides with the concept that in general morphometry of drumlins is mostly independent of their location and the characteristics of the ice streams.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":"84 1","pages":"45-57"},"PeriodicalIF":0.7,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630212","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: 11