Scottish Journal of Geology最新文献_第9页

Site selection of small round holes in crinoid pluricolumnals, Trearne Quarry SSSI (Mississippian, Lower Carboniferous), north Ayrshire, UK 英国艾尔郡北部Trearne采石场SSSI（密西西比，下石炭纪）海百合多柱体小圆孔的选址

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-10-16 DOI: 10.1144/sjg2018-010

S. Donovan, Gary Hoare

引用次数: 2

On the age of the Ballantrae Complex, SW Scotland 关于苏格兰西南部Ballantrae建筑群的年代

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-07-25 DOI: 10.1144/sjg2017-012

P. Stone, A. Rushton

{"title":"On the age of the Ballantrae Complex, SW Scotland","authors":"P. Stone, A. Rushton","doi":"10.1144/sjg2017-012","DOIUrl":"https://doi.org/10.1144/sjg2017-012","url":null,"abstract":"The Ballantrae Complex, SW Scotland, is an ophiolitic assemblage of mostly Early and early Middle Ordovician age (Tremadoc–Arenig in terms of the British Ordovician Series). Its varied components were generated and assembled in the Iapetus Ocean, then obducted on to the Laurentian continental margin by the earliest Llanvirn. The timing of obduction is constrained by biostratigraphic and radiometric data. It was most probably a polyphase process initiated at about the beginning of the Arenig, at around 478 Ma. However, parts of the Complex are significantly younger, with some recent evidence taken to suggest an earliest Llanvirn age of about 464 Ma for the emplacement of some of the volcanic and pelagic sedimentary rocks. The oldest strata in the succession that now unconformably overlies the Ballantrae Complex were deposited at about 463 Ma. Hence there may have been as little as one million years available for the final stages of the Complex's tectonic assembly, obduction, uplift, erosion and downfaulting. Obduction of the Complex has been invoked as a factor in the initiation of the Grampian Orogeny and, whilst there is a broad correlation in timing, the detail from Ballantrae militates against a causal relationship.","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2018-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42598495","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

Allocation of Devonian acanthodian lectotypes 泥盆纪棘蜥选择型的分配

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-06-28 DOI: 10.1144/sjg2018-008

M. Newman, C. Burrow

引用次数: 0

The Lonfearn Member, Lealt Shale Formation, (Middle Jurassic) of the Inner Hebrides, Scotland 苏格兰内赫布里底群岛Lealt页岩组Lonfarn段（侏罗纪中期）

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-05-15 DOI: 10.1144/sjg2017-015

J. D. Hudson, M. Wakefield

{"title":"The Lonfearn Member, Lealt Shale Formation, (Middle Jurassic) of the Inner Hebrides, Scotland","authors":"J. D. Hudson, M. Wakefield","doi":"10.1144/sjg2017-015","DOIUrl":"https://doi.org/10.1144/sjg2017-015","url":null,"abstract":"The Lonfearn Member, Lealt Shale Formation, is a distinctive unit within the Great Estuarine Group in the Middle Jurassic of the Inner Hebrides, Scotland. Its dominant lithology of fine-grained, partly laminated mudstone marks it out as a time of minimum input of coarse clastic material into the Hebridean Basin, when consistent facies extended over some 90 km between north Skye and the Isle of Eigg. Interbedded with the mudstones are thin (decimetre) shelly and partly ferruginous and oolitic limestones, the combination giving a unique facies association in the British Bathonian. The predominantly low-salinity biota is dominated by the bivalve Neomiodon, ostracods and spinicaudatans. Episodes of inferred higher salinity aid in correlating sections from the type locality in North Trotternish, Skye to other localities, principally Strathaird in south Skye and the Isle of Eigg. We describe the principal outcrops of the Lonfearn Member and the remarkable facies continuity within the Great Estuarine Group indicating tectonic quiescence within the basin and hinterland at this time. Supplementary material: The detailed measured stratigraphical logs discussed in this paper are available at https://doi.org/10.6084/m9.figshare.c.4093991","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41742688","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

A redescription of the endemic antiarch placoderm Asterolepis thule from the Middle Devonian (Givetian) of Shetland and its biostratigraphical horizon 设得兰群岛中泥盆世(吉文世)特有的反弓板皮动物Asterolepis thule的重新描述及其生物地层

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-05-15 DOI: 10.1144/sjg2018-005

M. Newman, J. D. Den Blaauwen

引用次数: 4

Lateglacial to Holocene palaeoenvironmental change in the Muck Deep, offshore western Scotland 苏格兰西部近海Muck Deep的晚冰期至全新世古环境变化

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-05-15 DOI: 10.1144/sjg2017-014

R. Arosio, J. Howe

{"title":"Lateglacial to Holocene palaeoenvironmental change in the Muck Deep, offshore western Scotland","authors":"R. Arosio, J. Howe","doi":"10.1144/sjg2017-014","DOIUrl":"https://doi.org/10.1144/sjg2017-014","url":null,"abstract":"Shelf basins (‘glacial incisions’) can preserve a detailed record of palaeoclimatic changes due to their low-energy environment. The ‘Muck Deep’, a complex of glacially-overdeepened troughs on the Inner Hebrides shelf constitutes an example of such an environment. Five sediment cores from the Muck Deep have been analysed and related to geomorphological evidence and subsurface seismic facies. The cores show an integrated sequence of sedimentary and faunal variations from the retreat of ice (c. 17 ka) to the present day. Glacimarine sandy muds with ice-rafted debris are dated to about 11.9 cal ka BP, supporting glacial occupancy in western Scotland until the latest stages of GS-1. The transition from a paraglacial to a more stable landscape is indicated by an erosional boundary in one of the cores dated between 11.3 and 11.6 cal ka BP. Sandy sediments in a core from 200 m water depth show two upward-fining cycles and a mid-core erosional unconformity, interpreted as bottom-current deposits. Such structures do not occur in the western Muck Deep, indicating different bottom current velocities through time. A regional signal of increasing current energy at the end of the Holocene marine transgression is interpreted as the onset of modern oceanographic conditions. Supplementary material: Extra figures and table content is available at https://doi.org/10.6084/m9.figshare.c.4093997","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48440494","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

Facies and petrographic assessment of Upper Devonian outcrops, Dunnet Head and Orkney, northern Scotland 苏格兰北部Dunnet Head和Orkney地区上泥盆统露头相及岩石学评价

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-04-18 DOI: 10.1144/sjg2017-017

Longxun Tang, S. Jones, J. Gluyas

{"title":"Facies and petrographic assessment of Upper Devonian outcrops, Dunnet Head and Orkney, northern Scotland","authors":"Longxun Tang, S. Jones, J. Gluyas","doi":"10.1144/sjg2017-017","DOIUrl":"https://doi.org/10.1144/sjg2017-017","url":null,"abstract":"Upper Devonian strata occur in the Central and Northern North Sea and crop out in coastal exposures in northeastern Scotland. The strata comprise continental sandstones and intercalated conglomerates, siltstones and mudstones. The offshore Upper Devonian unit (Buchan Formation) has been proven as a locally important hydrocarbon reservoir; however, the limited core coverage in the North Sea means that the architecture of the Buchan Formation is poorly understood. This study looks at two localities in Caithness and Orkney with excellent Upper Devonian exposures, which are chronologically equivalent to the Buchan Formation. The main aims are to describe the facies present and to investigate the mineralogical compositions and porosity variations using petrographic analyses. The results indicate that the studied outcrops were formed by braided fluvial and aeolian dune deposition. The aeolian sandstones have higher compositional/textural maturity and porosity than the fluvial sandstones. The main control on porosity is facies variation that results in differences in sedimentary structures, grain size and abundance of rock fragments. With similar palaeoclimate, depositional environments, lithologies and petrographies, these outcrops can be considered excellent analogues for the Buchan Formation reservoirs in the North Sea.","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42059091","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

Mating trackways of a fossil giant millipede 巨型千足虫化石的交配轨迹

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-04-18 DOI: 10.1144/sjg2017-013

M. Whyte

引用次数: 5

A sauropod-dominated tracksite from Rubha nam Brathairean (Brothers’ Point), Isle of Skye, Scotland 苏格兰斯凯岛ruha nam Brathairean (Brothers ' Point)的蜥脚类动物占主导地位的足迹

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-04-02 DOI: 10.1144/sjg2017-016

Paige E. dePolo, S. Brusatte, T. Challands, D. Foffa, D. Ross, Mark Wilkinson, Hong-yu Yi

{"title":"A sauropod-dominated tracksite from Rubha nam Brathairean (Brothers’ Point), Isle of Skye, Scotland","authors":"Paige E. dePolo, S. Brusatte, T. Challands, D. Foffa, D. Ross, Mark Wilkinson, Hong-yu Yi","doi":"10.1144/sjg2017-016","DOIUrl":"https://doi.org/10.1144/sjg2017-016","url":null,"abstract":"Middle Jurassic dinosaur fossils are exceedingly rare, but new discoveries from the Isle of Skye, Scotland, are beginning to fill this gap. We here describe a new dinosaur tracksite found in the Lealt Shale Formation (Bathonian) of the Great Estuarine Group at Rubha nam Brathairean (Brothers' Point) on Skye. The site preserves an abundance of small sauropod manus and pes prints and several isolated and broken medium-to-large tridactyl footprints. The main site occurs on a single horizon of shaley limestone that formed in a lagoonal environment. The sauropod tracks are tentatively assigned to the ichnotaxon Breviparopus due to the narrow gauge of the trackways, the digital characteristics of the pes, and the ratio of heteropody observed between the manus and the pes. A theropod trackmaker is inferred for some of the tridactyl impressions with several indicative of the ichnotaxon Eubrontes. This new site strengthens the inference, originally based on a previously discovered locality near Duntulm Castle (Duntulm Formation) in northern Skye, that sauropods habitually spent time in lagoons during the Middle Jurassic. Supplementary material: The photogrammetric model of track BP2_40 and associated metadata and photographs are available at https://doi.org/10.6084/m9.figshare.c.4046390","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2018-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41576847","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

Multi-stage pyrite genesis and epigenetic selenium enrichment of Greenburn coals (East Ayrshire) Greenburn煤的多阶段黄铁矿成因和表观遗传学富硒（东艾尔郡）

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-01-10 DOI: 10.1144/sjg2017-010

L. Bullock, J. Parnell, Magali Perez, A. Boyce, J. Feldmann, J. Armstrong

{"title":"Multi-stage pyrite genesis and epigenetic selenium enrichment of Greenburn coals (East Ayrshire)","authors":"L. Bullock, J. Parnell, Magali Perez, A. Boyce, J. Feldmann, J. Armstrong","doi":"10.1144/sjg2017-010","DOIUrl":"https://doi.org/10.1144/sjg2017-010","url":null,"abstract":"Carboniferous coals of the Ayrshire Coalfield are enriched in selenium (Se) relative to average UK and world compositions, substituting for sulphur in pyrite. Greenburn surface mine coals are characterized by syngenetic concretionary pyrite (c. 15% total area), occurring as bedding-parallel banding, and later-formed (epigenetic) cross-cutting pyrite in cleats (c. 9% total area). In these, sulphur isotope compositions for both syngenetic and epigenetic pyrite include isotopically light and heavy variants, suggesting diagenetic and hydrothermal fluid formation. Late/post-Visean cleat-filling pyrite is enriched in Se (up to 266 ppm) compared to the earlier-formed material (Se up to 181 ppm). Anomalous Se may have been sourced from near-by sulphidic Dalradian metamorphic rocks. Initial Se sequestration is associated with syngenetic pyrite mineralization, absorbed from seawater and pore waters, with additional Se introduced from fluids mobilized during epigenetic pyrite formation. Cleats from local brittle fracturing provided channels for fluid flow and a locus for precipitation of comparatively high-Se pyrite. Permian dolerite intrusions may have provided an enrichment source and/or fluid distribution mechanism. The Se concentrations of the Greenburn coals relate to multi-stage mineralization, with cleat-filling pyrite showing the highest Se content, and highlight the potential for high Se in similarly altered and fractured coal deposits worldwide. Supplementary material: LA-ICP-MS maps for Fe, Se, Ag, As, Cu, Hg, Pb and Te for Greenburn coal samples from seams 9300 Lime and 6900 Burnfoot Bridge are available at https://doi.org/10.6084/m9.figshare.c.3967860","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2018-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47250113","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