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

Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland sanukitoids与壳源性熔体的关系及其对新太古代花岗岩类多样性的意义——以芬兰东部苏曼索及其附近地区为例

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2014-06-01 DOI: 10.17741/BGSF/86.1.002

Perttu Mikkola, E. Heilimo, H. Huhma

{"title":"Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland","authors":"Perttu Mikkola, E. Heilimo, H. Huhma","doi":"10.17741/BGSF/86.1.002","DOIUrl":"https://doi.org/10.17741/BGSF/86.1.002","url":null,"abstract":"Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: a case study from Surmansuo and nearby areas, Eastern Finland We present new isotopic data (U-Pb and Sm-Nd) from the Neoarchean granitoids of the Lentua complex, which is a part of the Western Karelia subprovince of the Fennoscandian Shield. Compositionally, the samples are granitoids belonging to the sanukitoid suite and K-rich granitoids. Certain samples interpreted as partial melts of pre-existing crust in this study display more mafic compositions than previously described from the surrounding areas. This indicates, at least locally, a source poorer in SiO2 than the TTG (Tonalite-Trondhjemite-Granodiorite) suite granitoids, which are the likely sources for the majority of the anatectic granitoids within the Lentua complex. Based on new geochronological data (LA-MC-ICPMS U-Pb on zircon), the sanukitoids and anatectic granitoids are at least partly coeval (2.69 Ga) in the area, but interaction between the two felsic magmas was limited. The dated sanukitoid sample is distinctly younger (2687±8 Ma) than the average age of the sanukitoids of the Western Karelia subprovince (2718±3 Ma) indicating, together with one previously published sanukitoid age, the existence of a younger sanukitoid phase. This study gives new important constraints to understanding the formation of the Western Karelia subprovince by expanding the observed compositional heterogeneity and the temporal overlap of the different Neoarchean granitoid suites.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67631034","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: 9

The age and origin of the Vaasa migmatite complex revisited 重新考察了瓦萨杂岩杂岩的年龄和起源

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2014-06-01 DOI: 10.17741/BGSF/86.1.003

E. Suikkanen, H. Huhma, M. Kurhila, Y. Lahaye

{"title":"The age and origin of the Vaasa migmatite complex revisited","authors":"E. Suikkanen, H. Huhma, M. Kurhila, Y. Lahaye","doi":"10.17741/BGSF/86.1.003","DOIUrl":"https://doi.org/10.17741/BGSF/86.1.003","url":null,"abstract":"The origin of the Vaasa migmatite complex was studied by using whole-rock Sm-Nd and zircon Lu-Hf and U-Pb data in conjunction with whole-rock major and trace element geochemistry. The concordia ages of five Vaasa area granitoid samples are 1.88–1.86 Ga, constraining the age of peak migmatization. The ages of inherited zircon cores in the samples show two clear age populations at 2.02–1.92 Ga and c. 2.7 Ga, which correspond to ages yielded by a mica schist sample from the adjacent Evijarvi belt, as well as with published values for the Evijarvi belt zircon. The initial e Nd values of the Vaasa complex samples are relatively unradiogenic (from -3.0 to -2.0). Such values are comparable to a value (-3.6) calculated for the Evijarvi mica schist, as well as to literature values (from 3.0 to -0.5) for the Evijarvi belt. The average initial zircon e Hf values of four of the granitoids range from -10 to -5 and are in agreement with the Nd-isotopic results, whereas the northmost sample has a significantly higher value (+1). The deviation is suggested to result from disequilibrium melting of zircon. The isotopic and geochronological data indicate that the Vaasa complex granitoids formed by partial melting of the Evijarvi belt metasedimentary rocks.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67631091","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: 9

Exploration methods for granitic natural stones - Geological and topographical aspects from case studies in Finland 花岗岩天然石材的勘探方法。芬兰案例研究的地质和地形方面

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2014-06-01 DOI: 10.17741/BGSF/86.1.001

O. Selonen, C. Ehlers, H. Luodes, P. Härmä

引用次数: 9

Application of lithogeochemistry in the assessment of nickel-sulphide potential in komatiite belts from northern Finland and Norway 岩石地球化学在芬兰北部和挪威科马铁矿带硫化镍电位评价中的应用

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2013-12-01 DOI: 10.17741/BGSF/85.2.001

G. Heggie, S. Barnes, M. Fiorentini

引用次数: 11

Development of an ancient shoreline database to reconstruct the Litorina Sea maximum extension and the highest shoreline of the Baltic Sea basin in Finland 开发古海岸线数据库，重建芬兰波罗的海盆地的利托里纳海最大延伸和最高海岸线

IF 0.7 4区地球科学

Bulletin of the Geological Society of Finland Pub Date : 2013-12-01 DOI: 10.17741/BGSF/85.2.002

A. Ojala, J. Palmu, A. Åberg, S. Åberg, Hanna Virkki

{"title":"Development of an ancient shoreline database to reconstruct the Litorina Sea maximum extension and the highest shoreline of the Baltic Sea basin in Finland","authors":"A. Ojala, J. Palmu, A. Åberg, S. Åberg, Hanna Virkki","doi":"10.17741/BGSF/85.2.002","DOIUrl":"https://doi.org/10.17741/BGSF/85.2.002","url":null,"abstract":"An ArcGIS geodatabase called the Ancient Shoreline Database (ASD) was developed for the study and interpretation of ancient shorelines and shoreline displacement information. It was further divided into the Isolation Database (ISD) and Shoreline Landform Database (SLD) based on the characteristics of the available information. In the current study, observations related to the maximum extension of the Litorina Sea and the highest shoreline in Finland were carefully recorded and classified in the ASD. A total of 1625 shoreline observations were stored in the ASD, of which 106 were stratigraphic data points from dated isolation horizons (ISD) and the remaining 1519 were data points representing morphological shoreline observations (SLD). This paper describes the content of the ASD in terms of the variability and reliability of collated data points, but also introduces how modern LiDAR-based digital elevation models were utilized in validating the published observations as well as in interpreting new data points related to ancient shorelines from areas lacking information. The compiled ASD was used to reconstruct the diachronous maximum extension of the Litorina Sea and the highest shoreline of the Baltic Sea basin in Finland.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630982","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: 44

Timing of the Baltic Ice Lake in the eastern Baltic 波罗的海东部冰湖的形成时间

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/85.1.001

J. Vassiljev, L. Saarse

{"title":"Timing of the Baltic Ice Lake in the eastern Baltic","authors":"J. Vassiljev, L. Saarse","doi":"10.17741/BGSF/85.1.001","DOIUrl":"https://doi.org/10.17741/BGSF/85.1.001","url":null,"abstract":"A shoreline database for the Baltic, covering the Late Weichselian and Holocene, was compiled. The database includes about 1600 sites from Estonia, Latvia, Lithuania, Finland, NW Russia, Poland, Sweden and was used to create a GIS-based palaeogeographical reconstructions on the development of the Baltic Ice Lake (BIL). The formation of the highest shoreline of the BIL in Estonia was connected with the development of the Pandivere ice marginal zone (Estonia) and the lowest with the Salpausselka ice-marginal formations (Finland). There was a well-accepted knowledge that the Pandivere ice marginal zone correlates with the Neva ice marginal zone in NW Russia dated to 13 300 cal yr BP. Recent studies of the late glacial sites in northern Estonia indicate that the age of the Pandivere ice marginal zone and hence the highest shoreline of the BIL A 1 is about 13 800–14 000 cal yr BP. It was followed by the BIL stage A 2 , which formed in front of the Palivere ice marginal belt about 13 200–13 500 cal yr BP. The final drainage of the BIL took place about 11 650 cal yr BP. The timing of the BIL stages was derived from AMS- 14 C dates and correlated with varve chronology, OSL and 10 Be dates.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2013-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630615","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: 35

A comparative analysis of two Early Palaeozoic marine impact structures in Estonia, Baltic Sea: Neugrund and Kärdla 波罗的海爱沙尼亚两个早古生代海相冲击构造的对比分析:Neugrund和Kärdla

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/85.1.006

S. Suuroja, K. Suuroja, T. Flodén

{"title":"A comparative analysis of two Early Palaeozoic marine impact structures in Estonia, Baltic Sea: Neugrund and Kärdla","authors":"S. Suuroja, K. Suuroja, T. Flodén","doi":"10.17741/BGSF/85.1.006","DOIUrl":"https://doi.org/10.17741/BGSF/85.1.006","url":null,"abstract":"Kardla and Neugrund are two Early Palaeozoic offshore impact structures located some 50 km apart along the Estonian coast of the Baltic Sea. They share many similarities but differing features are also found. The Kardla impact structure is located at the NE coast of Hiiumaa Island (58°58’N, 22°46’E). The inner crater has a 4 km rim-to-rim diameter and a c. 130 m high central uplift, surrounded by a ring fault, c. 12 km in diameter. The well-preserved buried inner crater is outlined in the landscape by a circular ridge of uplifted bedrock. The perimeter of the outer crater is outlined on the seafloor by a semicircular ridge of narrow shoals. The variable height of the rim wall (50–240 m above the crystalline basement level) and the asymmetric location of the inner crater is obviously a result of an oblique impact in a layered target and partial collapse of the rim wall. Shortly after the impact in a shallow epicontinental sea during Late Ordovician time (c. 455 My), calcareous biodetritic muds were deposited and the crater was buried. The Neugrund impact structure is located in the seabed at the entrance of the Gulf of Finland (59°20’N, 23°31’E). The inner crater has a 7 km rim-to-rim diameter and the outer limit of the structure passes through the Osmussaar Island to the southwest of the impact centre. The crater was buried in a shallow epicontinental sea with siliciclastic deposition shortly after the impact at Early Cambrian time, c. 535 My. It was partially re-exposed by erosion during Pliocene. The target had a three-layered composition: Precambrian metamorphic rocks covered by Ediacaran and Early Cambrian siliciclastic rocks (c. 150 m) and water (c. 100 m). The structure has been studied with seismoacoustic and sidescan sonar profiling, and by diving and sampling of submarine outcrops. Several hundred samples of impact breccias have been collected and investigated from erratic boulders distributed by glacial action in the west Estonian mainland, islands and sea floor.","PeriodicalId":55302,"journal":{"name":"Bulletin of the Geological Society of Finland","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2013-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67630912","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

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