Gff最新文献_第7页

Einführung in die Kristallographie 晶体学导论

IF 1 4区地球科学

Gff Pub Date : 2020-10-21 DOI: 10.1524/9783486598858

W. Kleber

引用次数: 96

Correction 校正

IF 1 4区地球科学

Gff Pub Date : 2020-10-01 DOI: 10.1080/11035897.2020.1823082

引用次数: 0

High-resolution event stratigraphy (HiRES) of the Silurian across the Cincinnati Arch (USA) through integrating conodont and carbon isotope biochemostratigraphy, with gamma-ray and sequence stratigraphy 通过整合牙形石和碳同位素生物化学地层学、伽马射线和层序地层学，对美国辛辛那提拱门志留系进行高分辨率事件地层学（HiRES）

IF 1 4区地球科学

Gff Pub Date : 2020-10-01 DOI: 10.1080/11035897.2020.1819407

Stephan C. Oborny, B. Cramer, C. Brett

{"title":"High-resolution event stratigraphy (HiRES) of the Silurian across the Cincinnati Arch (USA) through integrating conodont and carbon isotope biochemostratigraphy, with gamma-ray and sequence stratigraphy","authors":"Stephan C. Oborny, B. Cramer, C. Brett","doi":"10.1080/11035897.2020.1819407","DOIUrl":"https://doi.org/10.1080/11035897.2020.1819407","url":null,"abstract":"ABSTRACT Silurian strata within the tristate area of Indiana, Ohio, and Kentucky have been thoroughly studied for well over a century. Due to rapid facies changes throughout the region numerous lithostratigraphic terminologies were established, many of which were difficult to correlate even over short distances. Recently these stratigraphic complexities have received renewed interest due to advancements in bio-, chemo-, and sequence stratigraphy that greatly improved our understanding of the tristate area. These improvements had significant implications for our ability to correlate Rhuddanian through lower Sheinwoodian strata between the Appalachian and Illinois basins and allowed unified nomenclatural and sequence stratigraphic hierarchies for this interval to be developed across the Cincinnati Arch. Recent advancements in regional chronostratigraphy of Silurian strata, however, highlight several discrepancies with regards to the 3rd- and 4th-order sequence stratigraphic hierarchies assigned within these basins. In an effort to alleviate these points of disagreement, we contribute new δ13Ccarb chemostratigraphic and sequence stratigraphic analyses of a basinward Appalachian section from Scioto County, Ohio, spanning upper Telychian through Gorstian strata assigned to the Estill through Tymochtee formations, complemented by gamma-ray core scans for localities traversing northwestward from the sampled core section into western Ohio. These new data allow unified nomenclatural and sequence stratigraphic hierarchies to be developed throughout the region for strata spanning the upper Telychian through Gorstian stages. Additionally, these findings highlight a significant shift in the primary sites of sediment accommodation during the studied depositional interval.","PeriodicalId":55094,"journal":{"name":"Gff","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1819407","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49394519","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

Dynamics of a retreating ice sheet: a LiDAR study in Värmland, SW Sweden 退缩冰盖的动力学:瑞典西南部Värmland的激光雷达研究

IF 1 4区地球科学

Gff Pub Date : 2020-10-01 DOI: 10.1080/11035897.2020.1822437

A. Goodship, H. Alexanderson

{"title":"Dynamics of a retreating ice sheet: a LiDAR study in Värmland, SW Sweden","authors":"A. Goodship, H. Alexanderson","doi":"10.1080/11035897.2020.1822437","DOIUrl":"https://doi.org/10.1080/11035897.2020.1822437","url":null,"abstract":"ABSTRACT Värmland in south western Sweden lies across the established zone of marine-terrestrial transition of the Scandinavian Ice Sheet (SIS) margin. The region lies inside the Younger Dryas maximum limit reached at 12.7 cal ka BP and the area of rapid final SIS retreat from 11.5 cal ka BP. LiDAR data across Värmland allows more detailed observation and analysis of glacial landforms formed during this stage than previously possible. This study synthesises geomorphological mapping performed on highly detailed digital elevation models (DEMs) and field observations across the region around Torsby in northern Värmland to reconstruct the dynamics of the ice sheet as it retreated. Several landforms that developed during deglaciation are identified and clearly reflect the change from a marine to terrestrially terminating ice margin. Ice-marginal deltas suggest a slowing of retreat at the point of marine-terrestrial transition. Increased topographic control on ice-sheet flow, pattern of drainage and ice sheet decay is indicated by the distribution of streamlined terrain, eskers, and outwash material. Hummocky terrain across low ground and incised valleys suggest persistence of ice in topographic lows beyond the retreat of the main ice front. Combined analysis of identified landforms allows a model for the pattern of retreat to be produced that traces the retreating ice sheet margin in far greater detail than previously has been possible in this area. This provides important data for understanding the final retreat of the SIS and details processes likely occurring beneath the margin of the Greenland Ice Sheet today.","PeriodicalId":55094,"journal":{"name":"Gff","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1822437","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45529206","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: 6

Zircon U–Pb-Hf isotope data in eclogite and metagabbro from southern Sweden reveal a common long-lived evolution and enriched source 瑞典南部榴辉岩和变辉长岩中的锆石U–Pb Hf同位素数据揭示了一个共同的长期演化和富集来源

IF 1 4区地球科学

Gff Pub Date : 2020-10-01 DOI: 10.1080/11035897.2020.1822438

A. Petersson, L. Tual

{"title":"Zircon U–Pb-Hf isotope data in eclogite and metagabbro from southern Sweden reveal a common long-lived evolution and enriched source","authors":"A. Petersson, L. Tual","doi":"10.1080/11035897.2020.1822438","DOIUrl":"https://doi.org/10.1080/11035897.2020.1822438","url":null,"abstract":"ABSTRACT Several orogenies have shaped the bedrock of southern Sweden. While mafic intrusions represent significant sources of information for reconstructing geodynamics and crustal evolution, the characterization of the various generations of such intrusions in Sweden remains limited. We report in situ zircon U–Pb ages and Hf isotope data from a Fe-Ti eclogite and a coronitic metagabbro from the Eastern Segment in southern Sweden. Crystallisation ages at 1683 ± 17 Ma of the eclogite suggest affiliation with the surrounding 1730–1660 Ma Transscandinavian Igneous Belt intrusions that dominate the Eastern Segment. Secondary zircon growth and Pb-loss in the eclogite sample at 1459 ± 44 Ma and the crystallisation of the metagabbro at 1431 ± 26 Ma overlap and are related to magmatic activity during the Hallandian orogeny. Zircon Hf isotope signatures with chondritic and sub-chondritic values at ~1683 Ma and ~1431 Ma, respectively, correspond to an enriched (or mildly depleted) source in line with a “Mixed Svecofennian Crustal Reservoir”. These isotope signatures are more enriched than those in the surrounding gneisses. Zircon isotope data from the herein analysed zircon grains indicate that the eclogite and metagabbro had an enriched mafic source in the mid to lower crust, or within the subcontinental lithospheric mantle below Fennoscandia.","PeriodicalId":55094,"journal":{"name":"Gff","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1822438","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48857047","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: 1

A new large mound dwelling chiton (Mollusca), from the Late Ordovician Boda Limestone of central Sweden 一种新的大丘栖石鳖(软体动物)，产于瑞典中部晚奥陶世的博达石灰岩

IF 1 4区地球科学

Gff Pub Date : 2020-09-24 DOI: 10.1080/11035897.2020.1819406

Anette E. S. Högström, J. R. Ebbestad, Yutaro Suzuki

引用次数: 0

The fossil alga Chaetocladus gracilis revisited: new material from the Silurian of Sweden 重访细毛壳藻化石：来自瑞典志留纪的新材料

IF 1 4区地球科学

Gff Pub Date : 2020-09-22 DOI: 10.1080/11035897.2020.1819408

J. Pettersson, P. Ahlberg, Anders Lindskog, J. Lindgren, M. Eriksson

{"title":"The fossil alga Chaetocladus gracilis revisited: new material from the Silurian of Sweden","authors":"J. Pettersson, P. Ahlberg, Anders Lindskog, J. Lindgren, M. Eriksson","doi":"10.1080/11035897.2020.1819408","DOIUrl":"https://doi.org/10.1080/11035897.2020.1819408","url":null,"abstract":"ABSTRACT In 2006, a new species of non-calcified dasycladalean alga, Chaetocladus gracilis, from the upper Silurian of Skåne (Scania), southernmost Sweden, was erected. The original description was based on a single incomplete fossil recovered from the abandoned limestone quarry at Bjärsjölagård, a classic geologic locality in Scania. Here we present four additional and, importantly, more complete specimens from this same site and type stratum. This new material largely corroborates the general anatomical features of C. gracilis, but also adds some intricate details, most notably with regards to the external sheet-like phytoleim and organisation of the laterals. Elemental mapping confirmed an expected carbonaceous composition of the fossils, which are embedded in a calcareous mudstone. These additional fossils show that the originally described specimen was not a singular occurrence at this locality. Based on the state of preservation of our algal fossils, we note that the mudstone facies of the Ludlow Bjärsjölagård Limestone Member of the Klinta Formation (Öved-Ramsåsa Group), from which all C. gracilis have been recovered, share characteristics with deposits typically referred to as “algal-Lagerstätten”.","PeriodicalId":55094,"journal":{"name":"Gff","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1819408","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41628162","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: 1

Ove Stephansson, 1938-2020 这位Stephansson，1938-2020

IF 1 4区地球科学

Gff Pub Date : 2020-09-07 DOI: 10.1080/11035897.2020.1809823

R. Lilljequist, A. Zang

引用次数: 1

Lituitid cephalopods from the upper Darriwilian and basal Sandbian (Middle–Upper Ordovician) of Estonia 来自爱沙尼亚上达里威廉和基底沙边(中上奥陶统)的流质头足类

IF 1 4区地球科学

Gff Pub Date : 2020-07-03 DOI: 10.1080/11035897.2020.1762723

M. Aubrechtová, T. Meidla

{"title":"Lituitid cephalopods from the upper Darriwilian and basal Sandbian (Middle–Upper Ordovician) of Estonia","authors":"M. Aubrechtová, T. Meidla","doi":"10.1080/11035897.2020.1762723","DOIUrl":"https://doi.org/10.1080/11035897.2020.1762723","url":null,"abstract":"ABSTRACT Cephalopods of the order Lituitida Starobogatov, 1983 from the late Darriwilian and early Sandbian strata of Estonia are revised herein. During that time, the lituitids reached their peak abundance and were among the key components of cephalopod faunas on Baltica, as well as in other mid- and low-latitude palaeogeographic locations. The Estonian lituitids mostly come from localities representing more off-shore environments with deeper-water sedimentation in the Middle Ordovician. This supports previous assumptions that lituitids preferred pelagic environments and were capable of long-distance migration. In the studied lituitid collection, two genera were identified – Lituites Bertrand, 1763 and Ancistroceras Boll, 1857. Three species – Ancistroceras ristnensis sp. nov., Ancistroceras vahikuelaensis sp. nov. and Lituites nehatuensis sp. nov. – were newly established. However, species determinations were often hindered by high intraspecific variability and fragmentary preservation. Investigation of cameral deposits using median sections showed that: connecting rings in chambers with deposits are commonly broken or missing; oriented fragments of connecting rings are present, sometimes overgrown by primary deposits; several generations of primary deposits can be developed; simultaneous presence of both broken and intact connecting rings in the same specimen is usual. These observations elucidate the formation of cameral deposits in lituitids. Currently, this process is explained either by passive deposition from cameral fluids, or active secretion by cameral mantle. The evidence collected herein from Estonian lituitids reveals, however, that both modes of formation might have occurred successively during the lituitid ontogeny and that a gradual, life-time destruction of connecting rings was possibly involved.","PeriodicalId":55094,"journal":{"name":"Gff","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1762723","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46905377","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: 3

New data on Marocella (Mollusca, Helcionelloida) from the Cambrian (Series 2–Miaolingian) of the Iberian Peninsula 伊比利亚半岛寒武纪(2 -苗岭系)Marocella(软体动物，Helcionelloida)新资料

IF 1 4区地球科学

Gff Pub Date : 2020-07-02 DOI: 10.1080/11035897.2020.1762722

L. Collantes, E. Mayoral, J. Chirivella, R. Gozalo

引用次数: 4