IF 1 4区地球科学

Gff Pub Date : 2019-01-02 DOI: 10.1080/11035897.2019.1566273

T. Mörs, Liping Liu, J. Hagström

引用次数: 1

The complexity of mudstone diagenesis – some insight from the Tøyen Shale, Lower to Middle Ordovician, southern Sweden 泥岩成岩作用的复杂性——从瑞典南部下奥陶世至中奥陶世的Tøyen页岩中获得的一些见解

IF 1 4区地球科学

Gff Pub Date : 2019-01-02 DOI: 10.1080/11035897.2018.1525620

S. Egenhoff, N. Fishman, H. Lowers, P. Ahlberg

{"title":"The complexity of mudstone diagenesis – some insight from the Tøyen Shale, Lower to Middle Ordovician, southern Sweden","authors":"S. Egenhoff, N. Fishman, H. Lowers, P. Ahlberg","doi":"10.1080/11035897.2018.1525620","DOIUrl":"https://doi.org/10.1080/11035897.2018.1525620","url":null,"abstract":"ABSTRACT The Lower to Middle Ordovician Tøyen Shale in southern Sweden, a biostratigraphically well-dated siliciclastic mudstone unit, shows 18 distinct authigenic cements that include sulfides, carbonates, silicates, clays, and phosphates. Marcasite, sphalerite, galena, and six texturally distinct types of pyrite characterize the sulfides whereas only one type of dolomite and three different generations of calcite are observed in this unit. Quartz, phosphate, and organic matter occur as only one generation each. Authigenic clay minerals are represented by chlorite and kaolinite. The paragenetic sequence of cements is subdivided into the two pre-burial carbonates, succeeded by ten relatively early burial cements, and six late burial cements, the kaolinite being the latest of them all and potentially being of Cretaceous age. Based on textural relationships, the paragenetic sequence of alterations started with dolomite precipitation followed by calcite, and then five different generations of pyrite. All eleven other phases post-date these initial seven cements in the Tøyen Shale.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"141 1","pages":"54 - 67"},"PeriodicalIF":1.0,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2018.1525620","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43295113","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

Character and tectonic setting of plutonic rocks in the Gällivare area, northern Norrbotten, Sweden 瑞典Norrbotten北部Gällivare地区深成岩的特征和构造背景

IF 1 4区地球科学

Gff Pub Date : 2018-11-15 DOI: 10.1080/11035897.2018.1526209

Zmar Sarlus, O. Martinsson, Tobias E. Bauer, C. Wanhainen, J. Andersson, R. Nordin

{"title":"Character and tectonic setting of plutonic rocks in the Gällivare area, northern Norrbotten, Sweden","authors":"Zmar Sarlus, O. Martinsson, Tobias E. Bauer, C. Wanhainen, J. Andersson, R. Nordin","doi":"10.1080/11035897.2018.1526209","DOIUrl":"https://doi.org/10.1080/11035897.2018.1526209","url":null,"abstract":"ABSTRACT Petrographical and lithogeochemical investigations in combination with mapping in the Gällivare area, northern Norrbotten, Sweden, have led to the identification of several igneous intrusive rock types. These include: (1) ultramafic-mafic complexes, (2) mafic-intermediate rocks, (3) dolerites and (4) felsic plutons. The ultramafic-mafic rocks include the ca. 1.88 Ga Dundret complex and ca. 1.80 Ga Vassaravaara complex. The Dundret complex has tholeiitic to calc-alkaline affinity, shows a primitive mineral content and was formed in an extensional tectonic setting. The Vassaravaara complex has a similar chemical signature as the Dundret complex. The mafic-intermediate plutons vary in composition from gabbro to diorite. The chemical signature of the dioritic rocks indicate formation in a volcanic arc setting. Dolerites occur as solitary dikes and have calc-alkaline affinity. The felsic plutons include granite and syenite of ca. 1.88, 1.80 and 1.78 Ga age. The felsic plutons have calc-alkaline to shoshonitic affinity and mostly show a metaluminous I-type character. Results indicate subduction at 1.90 Ga resulting in a volcanic arc system, and including extensional events generating back-arc environments leading to mafic, intermediate and felsic magmatism in the Gällivare area. Subduction at 1.80 Ga is suggested to have caused a similar process generating mafic and felsic magmatic rocks in the same area. A subsequent collision event finally generated 1.78 Ga granitic rocks.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"141 1","pages":"1 - 20"},"PeriodicalIF":1.0,"publicationDate":"2018-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2018.1526209","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42156343","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: 8

On the occurrence of gallium and germanium in the Bergslagen ore province, Sweden 瑞典Bergslagen矿省镓锗赋存状态的研究

IF 1 4区地球科学

Gff Pub Date : 2018-10-09 DOI: 10.1080/11035897.2018.1525619

E. Jonsson, K. Högdahl

{"title":"On the occurrence of gallium and germanium in the Bergslagen ore province, Sweden","authors":"E. Jonsson, K. Högdahl","doi":"10.1080/11035897.2018.1525619","DOIUrl":"https://doi.org/10.1080/11035897.2018.1525619","url":null,"abstract":"ABSTRACT The presence of the critical and sought-after (semi-)metals gallium (Ga) and germanium (Ge) has previously been reported from mineralisations in the Bergslagen ore province, south central Sweden. Some of these reports were however recently shown to be questionable or erroneous. Here we summarise early analytical work on these metals in mineral deposits of the Bergslagen province, as well as briefly report new analytical data for Ga and Ge from recent, in part on-going work on different mineralisation types. The new data show that the sampled sulphide and iron oxide mineralisations in the Bergslagen province are overall not particularly enriched in Ga, and even less so with regards to Ge. One major exception is the significant Ga enrichment observed in skarn-hosted Fe-REE(-polymetallic) deposits of Bastnäs type. Notably, these mineralisations also host increased contents of Ge. Based on this broader suite of sampled deposits, the suggested correlation between Ga and Al contents in previously studied material with relatively increased Ga grades, is in part contradicted, indicating that Ga is only in part sequestered through straightforward Al-substitution into aluminium silicate and oxide minerals. The mineralisations that do exhibit significantly increased Ge contents, in addition to the Bastnäs-type deposits, are represented by both sulphide-dominated ones and Fe (-Mn) oxide-rich systems.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"141 1","pages":"48 - 53"},"PeriodicalIF":1.0,"publicationDate":"2018-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2018.1525619","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48976705","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: 4

What the ca. 1.83 Ga gedrite-cordierite schists in the crystalline basement of Lithuania tell us about the late Palaeoproterozoic accretion of the East European Craton 立陶宛结晶基底中约1.83 Ga的晶闪石-紫青石片岩告诉我们东欧克拉通晚古元古代的增生过程

IF 1 4区地球科学

Gff Pub Date : 2018-10-02 DOI: 10.1080/11035897.2018.1544588

L. Siliauskas, G. Skridlaitė, B. Bagiński, M. Whitehouse, S. Prušinskienė

{"title":"What the ca. 1.83 Ga gedrite-cordierite schists in the crystalline basement of Lithuania tell us about the late Palaeoproterozoic accretion of the East European Craton","authors":"L. Siliauskas, G. Skridlaitė, B. Bagiński, M. Whitehouse, S. Prušinskienė","doi":"10.1080/11035897.2018.1544588","DOIUrl":"https://doi.org/10.1080/11035897.2018.1544588","url":null,"abstract":"ABSTRACT In the western East European Craton (EEC), southern Lithuania, a suite of fine-grained, thinly bedded rocks of unusual composition has been shown to have originally comprised intermediate and felsic volcanic rocks. They extruded at ca. 1.83 Ga and were hydrothermally altered prior to metamorphism, which converted them into garnet-, gedrite-, anthophyllite-, staurolite- and cordierite-bearing schists. After the rocks have experienced a 630°C and 7 kbar metamorphism, they were uplifted to 15 km (5 kbar) probably at ca. 1.73 Ga. They were reheated to 640°C at ca. 1.50 Ga (monazite age). The monazite age of ca. 1.50 Ga is coeval with the emplacement of the neighboring 1.50 Ga Anorthosite-Mangerite-Charnockite-Granite (AMCG) Mazury complex. The ca. 1.83 Ga volcanic suites in Lithuania and northern Poland, together with the Oskarshamn-Jönköping belt (OJB) in south-central Sweden, may belong to the same chain of volcanic island arcs, and thus provide information on the evolution of the entire western EEC. The ca. 1.50 Ga metamorphic reworking and the replacement of the Mazury AMCG suite may have been triggered by the Danopolonian orogeny further west and, at a larger scale, accretion of the continental margin of Columbia.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"140 1","pages":"332 - 344"},"PeriodicalIF":1.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2018.1544588","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42198841","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

New records of brachiopods and crinoids from the Silurian (Wenlock) of the southern Urals, Russia 俄罗斯乌拉尔南部志留纪(温洛克)腕足类和海百合类新记录

IF 1 4区地球科学

Gff Pub Date : 2018-10-02 DOI: 10.1080/11035897.2018.1526210

O. Bogolepova, S. Donovan, D. Harper, A. Suyarkova, R. Yakupov, A. Gubanov

引用次数: 1

Geomorphic evidence of multiple surface ruptures of the Merasjärvi “postglacial fault”, northern Sweden 瑞典北部Merasjärvi“冰川后断层”多次地表破裂的地貌证据

IF 1 4区地球科学

Gff Pub Date : 2018-09-19 DOI: 10.1080/11035897.2018.1492963

Colby A. Smith, S. Grigull, Henrik Mikko

引用次数: 12

Cameral deposits in Paleozoic cephalopods 古生代头足类动物的照相机沉积

IF 1 4区地球科学

Gff Pub Date : 2018-06-27 DOI: 10.1080/11035897.2018.1483966

H. Mutvei

{"title":"Cameral deposits in Paleozoic cephalopods","authors":"H. Mutvei","doi":"10.1080/11035897.2018.1483966","DOIUrl":"https://doi.org/10.1080/11035897.2018.1483966","url":null,"abstract":"Abstract Calcareous cameral deposits have been described in several orthocerid and actinocerid nautiloids. According to the prevailing hypothesis, they were secreted during the lifetime of the animal, either by living tissues in the shell chambers, or by precipitation from the cameral liquid. In the present paper, cameral deposits are described in three species of Carboniferous orthocerid-like coleoid (Order Colorthocerida) from USA. The shell walls and septa in these coleoids are very thin and poorly calcified. In one half of the population of the three species, the septa are completely fragmented and there are no cameral deposits. In the other half of the population, the septa are partially fractioned and their surfaces are covered by well-developed cameral deposits. In contrast to the septa, the cameral deposits do not show any fractioning. To explain the origin of the cameral deposits, the following hypothetical scenario is the most realistic. After the death of the animals, the shells were accumulated on the sea floor and in one half of the population the septa became fully fractioned by the hydrostatic pressure. In shells of another half of the population, the septa were only partially fractioned. The calcifying bacteria entered the chambers of the dead shells through the porous connecting rings and gave rise to the cameral deposits.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"140 1","pages":"254 - 263"},"PeriodicalIF":1.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2018.1483966","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42866584","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

A new look at Pleurotomaria perlata Hall, 1852 (Gastropoda) from the Silurian of Laurentia 劳伦提亚志留纪腹足目胸膜螈(Pleurotomaria perlata Hall, 1852)的新发现

IF 1 4区地球科学

Gff Pub Date : 2018-06-27 DOI: 10.1080/11035897.2018.1482564

J. S. Peel

引用次数: 0

Acanthodians from the Silurian–Devonian boundary beds of Novaya Zemlya Archipelago, Russia 俄罗斯新地岛群岛志留纪-泥盆纪交界层的刺蜥

IF 1 4区地球科学

Gff Pub Date : 2018-06-11 DOI: 10.1080/11035897.2018.1474381

C. Burrow, A. Ivanov, V. Ershova

引用次数: 0

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