IF 1 4区地球科学

Gff Pub Date : 2021-04-20 DOI: 10.1080/11035897.2021.1907441

E. Jarochowska, Oskar Bremer, A. Yiu, T. Märss, H. Blom, T. Mörs, V. Vajda

{"title":"Revision of thelodonts, acanthodians, conodonts, and the depositional environments in the Burgen outlier (Ludlow, Silurian) of Gotland, Sweden","authors":"E. Jarochowska, Oskar Bremer, A. Yiu, T. Märss, H. Blom, T. Mörs, V. Vajda","doi":"10.1080/11035897.2021.1907441","DOIUrl":"https://doi.org/10.1080/11035897.2021.1907441","url":null,"abstract":"ABSTRACT Ludfordian strata exposed in the Burgen outlier in eastern Gotland, Sweden record a time of initial faunal recovery after a global environmental perturbation manifested in the Ludfordian Carbon Isotope Excursion (LCIE). Vertebrate microfossils in the collection of the late Lennart Jeppsson, hosted at the Swedish Museum of Natural History, hold the key to reconstruct the dynamics of faunal immigration and diversification during the decline of the LCIE, but the stratigraphic relationships of the strata have been debated. Historically, they had been placed in the Burgsvik Formation, which included the Burgsvik Sandstone and the Burgsvik Oolite members. We revise the fauna in the Jeppsson collection and characterize key outcrops of Burgen and Kapellet. The former Burgsvik Oolite Member is here revised as the Burgen Oolite Formation. In the Burgen outlier, back-shoal facies of this formation are represented and their position in the Ozarkodina snajdri Biozone is supported. The shallow-marine position compared to the coeval strata in southern Gotland is reflected in the higher δ13Ccarb values, reaching +9.2‰. The back-shoal succession includes high-diversity metazoan reefs, which indicate a complete recovery of the carbonate producers as the LCIE declined. The impoverishment of conodonts associated with the LCIE in southern Gotland might be a product of facies preferences, as the diverse environments in the outlier yielded all 21 species known from the formation. Fish diversity also returned to normal levels as the LCIE declined, with a minimum of nine species. In line with previous reports, thelodont scales appear to dominate samples from the Burgen outlier.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"168 - 189"},"PeriodicalIF":1.0,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2021.1907441","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45367105","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

Dapingian to lower Darriwilian (Middle Ordovician) graptolite biostratigraphy and correlation of the Krapperup drill core, Scania, Sweden 瑞典斯堪尼亚大平期至下Darriwilian(中奥陶统)笔石生物地层学与Krapperup岩心对比

IF 1 4区地球科学

Gff Pub Date : 2021-01-02 DOI: 10.1080/11035897.2020.1822439

J. Maletz, P. Ahlberg

{"title":"Dapingian to lower Darriwilian (Middle Ordovician) graptolite biostratigraphy and correlation of the Krapperup drill core, Scania, Sweden","authors":"J. Maletz, P. Ahlberg","doi":"10.1080/11035897.2020.1822439","DOIUrl":"https://doi.org/10.1080/11035897.2020.1822439","url":null,"abstract":"ABSTRACT The Dapingian and lower Darriwilian graptolite succession of the Krapperup drill core from Scania, southern Sweden, provides a detailed insight into the axonophoran (biserial) graptolites and their early Palaeozoic evolutionary changes on the Scandinavian platform. Even though earliest Darriwilian axonophorans are not represented, the succession includes faunal elements of the basal Darriwilian Arienigraptus zhejiangensis Subzone of the Levisograptus austrodentatus Biozone, followed by Levisograptus mui and Levisograptus sinicus specimens higher up in the successsion. The highest interval is referred to the Eoglyptograptus cumbrensis Biozone and bears a number of axonophoran elements, including Oelandograptus oelandicus and Undulograptus camptochilus, previously known exclusively from chemically isolated material from the island of Öland. The top of the interval investigated is below the base of a carbonate-rich interval correlated with the Komstad Limestone of Scania, indicating that the investigated interval entirely belongs to the upper part of the Tøyen Shale Formation. Pseudisograptus manubriatus and Pseudisograptus koi are not restricted to the upper Dapingian, but range into the basal Darriwilian. Arienigraptus robustus n. sp. from the uppermost Dapingian, and Arienigraptus delicatus n. sp. and Arienigraptus balticus n. sp. from the basal Darriwilian, are described as new species.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"16 - 39"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1822439","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42515283","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

Stratigraphy of the Gorstian and Ludfordian (upper Silurian) Hemse Group reefs on Gotland, Sweden 瑞典哥特兰戈尔斯特阶和勒德福阶（上志留纪）Hemse群岩礁的地层学

IF 1 4区地球科学

Gff Pub Date : 2021-01-02 DOI: 10.1080/11035897.2020.1858959

Olof Taromi Sandström, P. Dahlqvist, M. Erlström, L. Persson, S. Kershaw, M. Calner

{"title":"Stratigraphy of the Gorstian and Ludfordian (upper Silurian) Hemse Group reefs on Gotland, Sweden","authors":"Olof Taromi Sandström, P. Dahlqvist, M. Erlström, L. Persson, S. Kershaw, M. Calner","doi":"10.1080/11035897.2020.1858959","DOIUrl":"https://doi.org/10.1080/11035897.2020.1858959","url":null,"abstract":"ABSTRACT The Hemse Group is one of the least understood stratigraphic units of the Silurian sequence of Gotland, Sweden. New results from airborne transient electromagnetic (ATEM) measurements in combination with previously published data from field studies and geophysical investigations shed new light on carbonate platform development during the early- to mid-Ludlow Hemse Group. ATEM reveals a transgressive phase that began near the Wenlock-Ludlow boundary, which resulted in deposition of marls and corresponds roughly to the Hemse limestone units a-c and the Hemse Marl NW. In this phase little or no reef development occurs. The end of the transgressive phase coincides with the weak Linde Event. The following highstand favoured extensive reef growth forming a reef barrier system of both fringing reefs and more rampiform settings with stromatoporoid biostromes and occasional biohermal buildups. The Kuppen-Snabben Unconformity Complex marks an erosional (karstic) sequence boundary and rocky shoreline and the transition from a rampiform setting with reef biostromes towards a more rimmed setting with patch reefs.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"71 - 83"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1858959","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42711236","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

U-Pb baddeleyite age for the Ottfjället Dyke Swarm, central Scandinavian Caledonides: new constraints on Ediacaran opening of the Iapetus Ocean and glaciations on Baltica 斯堪的纳维亚喀里多尼德斯中部Ottfjället堤岸群的U-Pb年龄:对伊迪亚卡拉纪Iapetus海洋开放和波罗的海冰川的新限制

IF 1 4区地球科学

Gff Pub Date : 2021-01-02 DOI: 10.1080/11035897.2021.1888314

R. Kumpulainen, M. Hamilton, U. Söderlund, J. P. Nystuen

{"title":"U-Pb baddeleyite age for the Ottfjället Dyke Swarm, central Scandinavian Caledonides: new constraints on Ediacaran opening of the Iapetus Ocean and glaciations on Baltica","authors":"R. Kumpulainen, M. Hamilton, U. Söderlund, J. P. Nystuen","doi":"10.1080/11035897.2021.1888314","DOIUrl":"https://doi.org/10.1080/11035897.2021.1888314","url":null,"abstract":"ABSTRACT The Ottfjället Dyke Swarm (ODS) is a prominent component of the Ediacaran mafic magmatism associated with opening of the Iapetus ocean, and hosted in the Särv Nappe, Middle Allochthon of the Scandinavian Caledonides. A U-Pb baddeleyite age of 596.3 ± 1.5 Ma for a thick, well preserved, plagioclase-phyric dolerite dyke in Härjedalen, Sweden, dates emplacement of the swarm. The age represents a robust, inheritance-free reference age for variably deformed and metamorphosed tholeiitic dykes in sandstone-dominated sequences of the lower part of the Middle Allochthon, representing the proximal, rifted Baltoscandian margin preceding the opening of Iapetus. The new age is within the narrow time span between 610 and 595 Ma defined by the most reliable age estimates for mafic dykes in structurally higher nappes (upper part of Middle Allochthon), representing the distal margin during the opening of Iapetus. The Ottfjället Dyke Swarm cuts the Tossåsfjället Group succession, which includes sabkha-related carbonate platform and diamictite couples, one of several correlated Neoproterozoic glaciogenic successions in Scandinavia. The intrusion age of ca. 596 Ma therefore sets a minimum age for the glaciogenic successions. It implies that Neoproterozoic glaciations in Scandinavia predate the ca. 580 Ma Gaskiers glaciation event and are probably part of the ca. 635 Ma Marinoan “Snowball-Earth”-type glaciation.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"40 - 54"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2021.1888314","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46930786","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

Timing of deformation, metamorphism and leucogranite intrusion in the lower part of the Seve Nappe Complex in central Jämtland, Swedish Caledonides 瑞典喀里多尼亚省Jämtland中部Seve Nappe杂岩下部的变形、变质作用和浅色花岗岩侵入时间

IF 1 4区地球科学

Gff Pub Date : 2021-01-02 DOI: 10.1080/11035897.2020.1858341

I. Klonowska, A. Ladenberger, D. Gee, P. Jeanneret, Yuan Li

{"title":"Timing of deformation, metamorphism and leucogranite intrusion in the lower part of the Seve Nappe Complex in central Jämtland, Swedish Caledonides","authors":"I. Klonowska, A. Ladenberger, D. Gee, P. Jeanneret, Yuan Li","doi":"10.1080/11035897.2020.1858341","DOIUrl":"https://doi.org/10.1080/11035897.2020.1858341","url":null,"abstract":"ABSTRACT Recent studies in the context of the International Continental Scientific Drilling Project “Collisional Orogeny in the Scandinavian Caledonides” have focused on the importance of the Seve Nappe Complex (SNC) for understanding the subduction history of the Baltoscandian margin during closure of the Iapetus Ocean. In the classical Åre area of western central Jämtland, granulite facies migmatites and leucogranites of the Åreskutan Nappe provide evidence of Early Silurian (c. 440 Ma) high temperature metamorphism and a previous prograde, ultra-high pressure history, with microdiamonds. New LA-ICPMS zircon isotope age investigations of the underlying amphibolite facies Lower Seve Nappes, reported here, have also identified an Early Silurian tectonothermal history with pegmatitic leucogranite (c. 443 Ma) and, at lower structural levels, another felsic intrusion of earliest Middle Ordovician age (c. 469 Ma). The latter intrudes isoclinally folded host rock amphibolites and calcareous psammitic paragneisses and is itself tightly folded. Zircons in an amphibolite proved to be highly discordant but indicate Early Silurian metamorphism during isoclinal folding. Detrital zircons in a paragneiss are dominated by Sveconorwegian populations, but also include a range of younger Neoproterozoic grains down to the Early Ediacaran (c. 600 Ma). This new evidence of early Caledonian deformation and metamorphism indicates that, as farther north in the orogen, the Seve tectonothermal history in central Jämtland probably started early in the Ordovician, or before. Subduction and accretion along the Baltoscandian outer margin occurred prior to Scandian continent-continent collision, with Siluro-Devonian emplacement of the SNC across the foreland basins onto the Baltoscandian platform.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"55 - 70"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1858341","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45916772","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

Eldoradia and Acrocephalops (Trilobita: Bolaspididae) from the middle Cambrian (Miaolingian) of northern Greenland (Laurentia) 格陵兰北部（劳伦蒂亚）中寒武纪（苗岭阶）的Eldoradia和Acrochalops（三叶虫：Bolaspididae）

IF 1 4区地球科学

Gff Pub Date : 2021-01-02 DOI: 10.1080/11035897.2020.1865446

J. S. Peel

引用次数: 1

Muonionalustaite, Ni3(OH)4Cl2·4H2O, a new mineral formed by terrestrial weathering of the Muonionalusta iron (IVA) meteorite, Pajala, Norrbotten, Sweden Muonionalustaite, Ni3(OH)4Cl2·4H2O，是瑞典北部Pajala Muonionalusta铁(IVA)陨石陆地风化形成的新矿物

IF 1 4区地球科学

Gff Pub Date : 2021-01-02 DOI: 10.1080/11035897.2020.1858342

D. Holtstam, L. Bindi, A. Karlsson, J. Söderhielm, A. Zetterqvist

{"title":"Muonionalustaite, Ni3(OH)4Cl2·4H2O, a new mineral formed by terrestrial weathering of the Muonionalusta iron (IVA) meteorite, Pajala, Norrbotten, Sweden","authors":"D. Holtstam, L. Bindi, A. Karlsson, J. Söderhielm, A. Zetterqvist","doi":"10.1080/11035897.2020.1858342","DOIUrl":"https://doi.org/10.1080/11035897.2020.1858342","url":null,"abstract":"ABSTRACT Muonionalustaite, ideally Ni3(OH)4Cl2 · 4H2O, is a new mineral species (IMA 2020–010), found as a terrestrial weathering product of the Muonionalusta iron meteorite, in a fragment excavated 1.5 km NE of Lake Kitkiöjärvi in northernmost Sweden. Muonionalustaite occurs in cavities of corrosion crust, associated with taenite, goethite, maghemite, amorphous Fe-Ni oxy-hydroxides and soil mineral particles. The mineral is green in colour and transparent. It occurs as lath-like crystals up to ca. 5 μm, elongated along [010] and flattened on {001}, forming aggregates and thin crusts. The calculated density and overall refractive index are 2.67(1) g·cm−3 and 1.68, respectively. An empirical formula from point analyses is (Ni2.88Fe0.02S0.02Al0.01Si0.01)Σ2.94(OH3.73Cl2.27)Σ6.00 · 4H2O. The crystal structure was refined in the space group C2/m from powder X-ray diffraction data to R Bragg = 3.55%. The monoclinic unit-cell parameters are a = 15.018(3) Å, b = 3.1490(6) Å, c = 10.502(3) Å, β = 101.535(15)º and V = 486.62(19) Å3 for Z = 2. Muonionalustaite is isostructural with the synthetic compounds Ni3(OH)3.9Cl2.1 · 4H2O and Mg3(OH)4Cl2 · 4H2O. The strongest X-ray diffraction lines are [I(%), d(Å), hkl]: 100, 10.30, 001; 67, 5.49, 201; 31, 3.868, 202; 30, 7.36, 200 and 25, 2.409, 6‾02. Raman spectra show prominent bands at 3624, 3612, 3571 and 3507 cm−1, related to O–H-stretching vibrations of OH− groups, and in the region 450–530 cm−1 representing metal–O(H) vibration modes.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"1 - 7"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1858342","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44826708","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

Meteorite crater re-interpreted as iceberg pit in west-central Sweden 瑞典中西部的陨石坑被重新解读为冰山坑

IF 1 4区地球科学

Gff Pub Date : 2020-12-18 DOI: 10.1080/11035897.2020.1853223

C. Öhrling, Henrik Mikko, Gustaf Peterson Becher, Carl Regnéll

{"title":"Meteorite crater re-interpreted as iceberg pit in west-central Sweden","authors":"C. Öhrling, Henrik Mikko, Gustaf Peterson Becher, Carl Regnéll","doi":"10.1080/11035897.2020.1853223","DOIUrl":"https://doi.org/10.1080/11035897.2020.1853223","url":null,"abstract":"ABSTRACT This study shows the occurrence of numerous iceberg imprints on the bottom of former ice-dammed lakes in Härjedalen, west-central Sweden. Discussion of the genesis of the so-called “impact crater” known as the Tor structure at Torbygget, which is located in this area, motivated an examination of the area using high-resolution digital elevation models. Previous investigations have suggested that this crater was created by a meteorite impact about 2000 years ago, forming a semi-round depression. The results of our investigation clearly indicate that the feature was formed by a grounding iceberg, scouring the bed of an ice-dammed lake during deglaciation about 11 000-10 000 cal. BP. Geomorphic evidence of an ice-dammed lake (multiple and abundant well-developed shorelines) are consistent with earlier mapping efforts in the area. Furthermore, an abundance of geomorphological traces of iceberg activity is found within the paleo-ice-dammed lake basins. Based on this we suggest that the depression at Torbygget is not an impact crater but formed by a grounded iceberg.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"84 - 91"},"PeriodicalIF":1.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2020.1853223","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48506048","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

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

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