Meinhold, Guido

[["dc.bibliographiccitation.firstpage","183"],["dc.bibliographiccitation.journal","Journal of Applied Geophysics"],["dc.bibliographiccitation.lastpage","196"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Muhamad, Harbe"],["dc.contributor.author","Juhlin, Christopher"],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","Andersson, Magnus"],["dc.contributor.author","Juanatey, Maria Garcia"],["dc.contributor.author","Malehmir, Alireza"],["dc.date.accessioned","2018-11-07T09:59:17Z"],["dc.date.available","2018-11-07T09:59:17Z"],["dc.date.issued","2015"],["dc.description.abstract","The Siljan impact structure is the largest known impact structure in Europe, the result of a Late Devonian meteorite impact (380.9 +/- 4.6 Ma). It is outlined mainly by a ring of lakes and Palaeozoic sedimentary rocks of Ordovician to Devonian age. The Palaeozoic successions are generally poorly exposed, but often well preserved with clear stratigraphy. At some locations they are strongly tectonised with sharply inclined or nearly overturned packages of crystalline basement and/or sediments. Down-hole logging data were acquired in the western part of the Siljan impact structure to determine some of the physical properties of the Palaeozoic sedimentary rocks in the area. Boreholes Mora 001 (356 m logged depth), Vattumyra Production (420 m logged depth), Mora VM 2 (94 m logged depth) and Mobillyft (437 m logged depth) were logged for temperature, sonic velocity and electrical resistivity. Logging data were compared to the lithology in the Mora 001 core, which had been mapped in detail, and information from other cores in the area. Good agreement between the natural gamma log and the core lithology was found. The sonic log shows a marked difference in velocity for the more clastic Silurian succession compared to the Ordovician succession and the Precambrian basement. A synthetic seismogram shows that a high amplitude reflection is expected at the Silurian-Ordovician boundary, raising some questions concerning interpretation of a seismic profile located about 6-7 km north of the study area. Correlation of the borehole logs shows that the thickness of the Silurian succession varies rapidly in the area and that its composition differs over distances of less than 1 km. These rapid variations suggest that the study area may be located in a megablock zone that was highly influenced by the impact Caledonian tectonics and changing depositional environments may also play a role in explaining the present-day borehole lithologies. Even though the boreholes are relatively far from the seismic profile and the geology is complex, the new data confirm that the Silurian has significant thickness along parts of the seismic profile. Potentially, the Silurian can be up to 450 m thick on parts of the profile. Further geophysical investigations in the area, including seismic surveying and gravity measurements, may help in mapping the complex structures away from the boreholes and discriminating between possible geological models. (C) 2015 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jappgeo.2015.02.019"],["dc.identifier.isi","000351646900018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37555"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1879-1859"],["dc.relation.issn","0926-9851"],["dc.title","Analysis of borehole geophysical data from the Mora area of the Siljan Ring impact structure, central Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","277"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Estonian Journal of Earth Sciences"],["dc.bibliographiccitation.lastpage","286"],["dc.bibliographiccitation.volume","63"],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","Wu, Rongchang"],["dc.contributor.author","Calner, Mikael"],["dc.contributor.author","Joachimski, Michael M."],["dc.date.accessioned","2018-11-07T09:31:11Z"],["dc.date.available","2018-11-07T09:31:11Z"],["dc.date.issued","2014"],["dc.description.abstract","Based on delta C-13 data from two drillcores recovered from the Siljan district, we present a first continuous carbon isotope record of the upper Tremadocian-lower Katian limestone succession of central Sweden. New names for some isotopic carbon excursions from the Cambrian-Ordovician boundary through the basal Darriwilian are introduced. The Mora 001 core from the western part of the Siljan impact structure ranges through the Lower-Middle Ordovician, whereas the Solberga 1 core from its eastern part ranges through the Middle-lower Upper Ordovician. Upper Tremadocian and Floian units are extremely condensed and include extensive stratigraphic gaps. Multiple hardgrounds, sometimes with minor karstic overprint, imply recurrent periods of erosion and/or non-deposition. Like in other parts of Sweden, the Dapingian and Darriwilian succession is characterized by a relatively complete sedimentary record and low sedimentation rates."],["dc.identifier.doi","10.3176/earth.2014.31"],["dc.identifier.isi","000346296000016"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11935"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31483"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Estonian Academy Publishers"],["dc.relation.issn","1736-7557"],["dc.relation.issn","1736-4728"],["dc.rights","CC BY 2.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/2.0"],["dc.title","delta C-13 chemostratigraphy in the upper Tremadocian through lower Katian (Ordovician) carbonate succession of the Siljan district, central Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","213"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","GFF"],["dc.bibliographiccitation.lastpage","227"],["dc.bibliographiccitation.volume","135"],["dc.contributor.author","Arslan, Arzu"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","Lehnert, Oliver"],["dc.date.accessioned","2018-11-07T09:23:47Z"],["dc.date.available","2018-11-07T09:23:47Z"],["dc.date.issued","2013"],["dc.description.abstract","The Stumsnas 1 core, drilled in 2011 in the southern part of the Siljan Ring, represents a structurally complex section and provides new insights into the impact-induced local structure in central Sweden. The Siljan Ring was formed around the central uplift of a Late Devonian meteorite crater, the largest known impact structure in Europe. The Stumsnas 1 core section reveals that about 90m of Palaeozoic (Lower to Upper Ordovician) sedimentary rocks are sandwiched between Proterozoic igneous basement rocks. The sedimentary contact to the underlying approximate to 260m of Proterozoic basement is a prominent unconformity. The contact to the overlying approximate to 190-m-thick slab of Proterozoic basement is a few metres wide complex fault zone, comprising alternating thin slices of sedimentary and granitic rocks together with fault breccia and gouge. The tectonic emplacement of basement rocks over the Palaeozoic sedimentary succession is apparently impact-related and caused folding and faulting of the underlying sediments, some of which were overturned and cut out. Minor fault zones occur throughout the Stumsnas 1 core section and have large damage zones with intense fracture networks along which alteration and mineralisation took place, likely also impact-related. Small-scale faults and fractures are common and are critical for fluid migration and hence for ongoing exploration for natural gas and geothermal energy reservoirs in the Siljan impact structure."],["dc.identifier.doi","10.1080/11035897.2013.809016"],["dc.identifier.isi","000323317400008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29667"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.relation.issn","1103-5897"],["dc.title","Ordovician sediments sandwiched between Proterozoic basement slivers: tectonic structures in the Stumsnas 1 drill core from the Siljan Ring, central Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","13"],["dc.bibliographiccitation.journal","Organic Geochemistry"],["dc.bibliographiccitation.lastpage","26"],["dc.bibliographiccitation.volume","68"],["dc.contributor.author","Ahmed, Manzur"],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Fuentes, David"],["dc.contributor.author","Meinhold, Guido"],["dc.date.accessioned","2018-11-07T09:43:20Z"],["dc.date.available","2018-11-07T09:43:20Z"],["dc.date.issued","2014"],["dc.description.abstract","Organic geochemical assessment of seep oil from the Upper Ordovician (Hirnantian) Boda Limestone and solid bitumens from the Middle Ordovician (Darriwilian) limestone formations in the Siljan Crater, Sweden indicates their generation primarily from peak oil window maturity, clay-rich marine source rocks that contained aquatic algal organic matter and were deposited in an anoxic environment. Biomarkers indicate some significant differences between the seep oil and solid bitumens and their alteration by moderate to severe biodegradation. The Solberga quarry seep oil from the Boda Limestone and Solberga-1 solid bitumen from the Skarlov-Seby-Folkslunda Limestone equivalents do not show signs of mixing and the similarity in their biomarker distributions indicates a genetic relationship. However, solid bitumens recovered from cavities in the underlying Segerstad and Holen limestones were derived predominantly from clay-rich source rocks that contained mixed marine and lacustrine algal organic matter and minor inputs of prokaryotic organic matter, possibly from thin beds of calcareous rocks interbedded within the main clay-rich source rocks. It is inferred that the Siljan Crater seep oil and solid bitumens were generated from the organic rich Upper Ordovician Fjacka Shale, a source rock for economic accumulation of oil in the eastern Baltic region, and/or from Silurian shale units. The presence of various compounds of known biological origin and existence of organic rich Fjacka Shale/Silurian Shale units are consistent with the biogenic origin of Siljan Crater petroleum. Although these seep oil and solid bitumens were generated at peak oil window maturities, the intense heat generated by meteorite impact caused secondary reactions resulting in unusual distributions of maturity sensitive aromatic hydrocarbon isomers and conflicting molecular maturities. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.orggeochem.2013.12.010"],["dc.identifier.isi","000332403900003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34161"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0146-6380"],["dc.title","Origin of oil and bitumen in the Late Devonian Siljan impact structure, central Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","204"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","GFF"],["dc.bibliographiccitation.lastpage","212"],["dc.bibliographiccitation.volume","135"],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","Arslan, Arzu"],["dc.contributor.author","Ebbestad, Jan Ove R."],["dc.contributor.author","Calner, Mikael"],["dc.date.accessioned","2018-11-07T09:23:47Z"],["dc.date.available","2018-11-07T09:23:47Z"],["dc.date.issued","2013"],["dc.description.abstract","The Stumsnas 1 core, drilled in 2011 in the southern part of the Siljan Ring, provides new insights into the stratigraphy of the Ordovician succession in central Sweden. The core section shows evidence of the structural complications caused by the late Devonian meteorite impact in the area. In the core, about 90m of Tremadocian to Darriwilian strata are sandwiched between Proterozoic igneous basement rocks. At the lower contact, the sedimentary succession starts with glauconitic, fine-grained siliciclastics and carbonates directly resting on the weathered basement. The basal siliciclastic unit is overlain by a ca. 19-m-thick limestone succession, well-known from this part of the Baltoscandian Basin, includes strata corresponding to the Latorp Limestone through the upper Holen Formation. This succession is covered by a limestone-marl alternating sequence, representing some yet unknown deeper water facies, presumably coeval to the topmost Holen Formation through upper Dalby Limestone. The upper third of the sedimentary succession in the core includes numerous slices of partly overturned strata, including relatively thick successions of the Slandrom Formation, Fjacka Shale and Jonstorp Formation, as well as carbonate and siliciclastic units of yet unknown stratigraphic origin."],["dc.identifier.doi","10.1080/11035897.2013.813582"],["dc.identifier.isi","000323317400007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29666"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.relation.issn","2000-0863"],["dc.relation.issn","1103-5897"],["dc.title","Ordovician stratigraphy of the Stumsnas 1 drill core from the southern part of the Siljan Ring, central Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","88"],["dc.bibliographiccitation.journal","Tectonophysics"],["dc.bibliographiccitation.lastpage","99"],["dc.bibliographiccitation.volume","580"],["dc.contributor.author","Juhlin, Christopher"],["dc.contributor.author","Sturkell, Erik"],["dc.contributor.author","Ebbestad, Jan Ove R."],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Hogstrom, Anette E. S."],["dc.contributor.author","Meinhold, Guido"],["dc.date.accessioned","2018-11-07T09:02:21Z"],["dc.date.available","2018-11-07T09:02:21Z"],["dc.date.issued","2012"],["dc.description.abstract","Two new reflection seismic profiles over the Paleozoic successions of the western part of the Siljan Ring impact structure show a contrasting seismic signature. The more southerly c. 10 km long Mora profile reveals a highly disturbed structure, with only a few kilometers of relatively horizontally layered structures observed. However, interpretations of refracted arrivals in the data, that can be correlated to reflections, indicate the Silurian clastic rocks to be about 200 m thick in the central part of the profile. Weak reflections from about 600 m depth suggest a 400 m thick Ordovician limestone sequence to be present. Cores from the area show a mainly shale lithology for the Silurian and only a thin sequence of Ordovician strata, suggesting a rapid thickening of the Ordovician towards the north. On the more northern c. 12 km Ursa profile clear reflections from the Paleozoic successions are seen along the entire profile, except on the southernmost few kilometers. Based on interpretations of refracted arrivals, the Silurian succession appears to be considerably thinner here, and possibly absent at some locations. The Ordovician is also interpreted to be thinner in this area, with a maximum thickness of about 200-300 m along most of the profile. A deeper reflection from about 2 km within the crystalline basement may represent a dolerite sill. The lack of clear basement reflections on the Mora profile can be attributed to near-surface conditions and the acquisition geometry. The seismic data and recent coring in the area suggest the presence of a deeper paleo-basin towards the southwest with significantly more shales being deposited and the Paleozoic successions being severely disturbed. The shallow coring and seismic data will help form the basis for locating future boreholes for deeper drilling to study impact processes and the Paleozoic evolution of central Sweden. (C) 2012 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","Swedish Research Council (VR) [2009-4492]"],["dc.identifier.doi","10.1016/j.tecto.2012.08.040"],["dc.identifier.isi","000316974100005"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11301"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24666"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0040-1951"],["dc.relation.orgunit","Fakultät für Geowissenschaften und Geographie"],["dc.rights","CC BY-NC-ND 3.0"],["dc.rights.uri","http://creativecommons.org/licenses/by-nc-nd/3.0/"],["dc.title","A new interpretation of the sedimentary cover in the western Siljan Ring area, central Sweden, based on seismic data"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","87"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","GFF"],["dc.bibliographiccitation.lastpage","98"],["dc.bibliographiccitation.volume","134"],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","Bergstroem, Stig M."],["dc.contributor.author","Calner, Mikael"],["dc.contributor.author","Ebbestad, Jan Ove R."],["dc.contributor.author","Egenhoff, Sven"],["dc.contributor.author","Frisk, Asa M."],["dc.contributor.author","Hannah, Judith L."],["dc.contributor.author","Hogstrom, Anette E. S."],["dc.contributor.author","Huff, Warren D."],["dc.contributor.author","Juhlin, Christopher"],["dc.contributor.author","Maletz, Joerg"],["dc.contributor.author","Stein, Holly J."],["dc.contributor.author","Sturkell, Erik"],["dc.contributor.author","Vandenbroucke, Thijs R. A."],["dc.date.accessioned","2018-11-07T09:15:09Z"],["dc.date.available","2018-11-07T09:15:09Z"],["dc.date.issued","2012"],["dc.description.abstract","New drill cores from the largest known impact structure in Europe, the relict of the Siljan meteorite crater, provide new possibilities to reconstruct Early Palaeozoic marine environments and ecosystems, and to document changes in sedimentary facies, sea level and palaeoclimate in Baltoscandia. The impact crater is an important target of the project \"Concentric Impact Structures in the Palaeozoic\" within the framework of the \"Swedish Deep Drilling Program\". Two core sections, Mora 001 and Solberga 1, have been analysed. The sedimentary successions of these core sections include strata of late Tremadocian through late Wenlock ages. Our preliminary studies show not only that several of the classical Palaeozoic units of Sweden are represented in the area, but also that other significantly different facies are preserved in the Siljan district. An erosional unconformity representing a substantial hiatus occurs between Middle Ordovician limestone and a Llandovery-Wenlock (Silurian) shale succession in the western part of the Siljan structure and suggests an extended period of uplift and erosion. This may be related to forebulge migration due to flexural loading by the Caledonian thrust sheet to the west. Thus, this part of Sweden, previously regarded as a stable cratonic area, presumably was affected by the Caledonian collision between Baltica and Laurentia."],["dc.identifier.doi","10.1080/11035897.2012.692707"],["dc.identifier.isi","000306600000002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27607"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.relation.issn","1103-5897"],["dc.title","New Ordovician-Silurian drill cores from the Siljan impact structure in central Sweden: an integral part of the Swedish Deep Drilling Program"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","260"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","GFF"],["dc.bibliographiccitation.lastpage","275"],["dc.bibliographiccitation.volume","139"],["dc.contributor.author","Muhamad, Harbe"],["dc.contributor.author","Juhlin, Christopher"],["dc.contributor.author","Sopher, Daniel"],["dc.contributor.author","Lehnert, Oliver"],["dc.contributor.author","Arslan, Arzu"],["dc.contributor.author","Meinhold, Guido"],["dc.date.accessioned","2020-12-10T18:15:02Z"],["dc.date.available","2020-12-10T18:15:02Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1080/11035897.2017.1386712"],["dc.identifier.eissn","2000-0863"],["dc.identifier.issn","1103-5897"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74714"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","High-resolution seismic imaging of Paleozoic rocks in the Mora area, Siljan Ring structure, central Sweden"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]