Bulletin of the Geological Society of Finland最新文献_第10页

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":null,"pages":null},"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":null,"pages":null},"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

Glacial varves at the distal slope of Pandivere-Neva ice-recessional formations in western Estonia 爱沙尼亚西部潘迪维尔-涅瓦冰川消退地层远端斜坡上的冰川裂口

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/84.1.001

P. Talviste, T. Hang, M. Kohv

{"title":"Glacial varves at the distal slope of Pandivere-Neva ice-recessional formations in western Estonia","authors":"P. Talviste, T. Hang, M. Kohv","doi":"10.17741/BGSF/84.1.001","DOIUrl":"https://doi.org/10.17741/BGSF/84.1.001","url":null,"abstract":"The distribution and varve thickness data of Late Weichselian varved clay were analyzed to describe the proglacial sedimentary environment, ice recession and water-level changes in the Baltic Ice Lake at the distal position of Pandivere–Neva (13.5–13.1 ka BP) icerecessional formations in western Estonia. According to vertical changes in natural water content, fabric and varve thickness, four clay units were distinguished, reflecting a change in the sedimentary environment from ice-proximal to distal conditions. The varved clay complex is locally interrupted by a massive silty-clay unit, interpreted as an icedrift material during the stagnation of the glacier margin at the Pandivere–Neva line. Varve correlation gave a 294-year-long floating varve chronology. According to total varve thickness and the relation between thicknesses of seasonal layers, an about 130year period of ice-proximal conditions in the study area was followed by a rapid (within ca 20 years) change to more distal conditions. The presented varve chronology does not cover the entire period of proglacial conditions in the area, as all studied clay sections displayed an erosional discontinuity at the upper contact. In total, ca 4 m of selective post-sedimentary erosion of clay is attributed to wave erosion due to a water-level drop after the final drainage of the Baltic Ice Lake. It is concluded that the Yoldia Sea minimum level in the Pärnu area was 0 to –2 m a.s.l.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630525","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

Geological setting and sedimentary characteristics of the coversands distributed in the western part of the Blonie glaciolacustrine basin (Central Poland) - preliminary results 波兰中部布隆尼冰湖盆地西部覆盖地的地质背景和沉积特征——初步结果

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/84.1.003

E. Kalińska

引用次数: 14

Geologic position of the Younger Dryas subfossil forest in the Warta River valley, central Poland 波兰中部瓦尔塔河谷新仙女木期亚化石森林的地质位置

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/84.1.006

D. Dzieduszyńska, J. Petera-Zganiacz

引用次数: 21