Carita Augustsson

University of Stavanger

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Heinrich Bahlburg

University of Münster

Jasper Berndt

University of Münster

Uwe Jenchen

Universidad Autónoma de Nuevo León

Sonia Alejandra Torres-Sánchez

Autonomous University of San Luis Potosí

Tobias Rüsing

University of Münster

Ellen Kooijman

Swedish Museum of Natural History

Udo Zimmermann

University of Stavanger

Juan Alonso Ramírez Fernández

Universidad Autónoma de Nuevo León

José Rafael Barboza-Gudiño

Autonomous University of San Luis Potosí

Dora Marín

Agder Energi (Norway)

Cooperative Institutions

University of Münster

University of Göttingen

Friedrich Schiller University Jena

Universidad Nacional Autónoma de México

University of Stavanger

Autonomous University of San Luis Potosí

Universidad Autónoma de Nuevo León

Eötvös Loránd University

University of Chile

Instytut Nauk Geologicznych

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Quartz and zircon decoupling in sandstone: Petrography and quartz cathodoluminescence of the Early Triassic continental Buntsandstein Group in Germany

Sedimentology (2019)

Carita Augustsson Michaela Aehnelt Thomas Voigt Cindy Kunkel Marcus Meyer

Abstract This study illustrates how decoupling of quartz and zircon can be used advantageously in provenance research. Thirty‐eight fine‐grained to coarse‐grained arkose samples of the Early Triassic intracontinental Buntsandstein Group from the Central European Basin in Germany were analysed for their petrography and 1200 grains in 23 of these for their detrital quartz cathodoluminescence characteristics. The samples represent the Hessian and Thuringian sub‐basins and the Eichsfeld–Altmark Swell separating them. The Hessian Sub‐basin includes more metamorphic lithoclasts with a larger content of plutonic grains than are found further east in the Thuringian Sub‐basin. More than 90% of the detrital quartz from the eastern Thuringian Sub‐basin produce medium to bright blue cathodoluminescence colours and corresponding spectra that are typical for igneous or high‐temperature metamorphic origin. Differently, the quartz from the Hessian Sub‐basin mostly luminesces brown and dark to medium blue, typical for a low‐temperature metamorphic origin. Quartz from the Eichsfeld–Altmark Swell and the western Thuringian Sub‐basin is a mixture between these origins. The quartz indicates different catchments for the sub‐basins, possibly the Bohemian Massif and the Massif Central, with converging transport routes on and close to the eastern fringe of the swell. Taking published zircon data from the same samples into account, light mineral‐zircon grain‐size shifts are up to 2 Φ units. That can be explained by mineral decoupling due to different transport modes for quartz and zircon and different zircon‐size availability in the source areas, exaggerated by combined aqueous–aeolian transport, as well as sample preparation‐induced sorting. This study concludes that submerged highs significantly can influence continental sediment transport. Hence, vast, flat continental areas with submerged morphological highs and a seemingly straightforward transportation pattern may be more complex than expected. The results also illustrate that analysis of detritus that has been affected by different dominating transport modes, and further sorting during sampling and preparation can reveal additional source information.

Massif

10.1111/sed.12620

Cite

Citations (14)

Provenance from the geochemical composition of terrestrial clastic deposits — A review with case study from the intracontinental Permo-Triassic of European Pangea

Sedimentary Geology (2023)

Carita Augustsson Michaela Aehnelt Mette Olivarius Thomas Voigt Reinhard Gaupp

How can inorganic geochemical data from terrestrial deposits be used as a provenance tool? We demonstrate a new approach as earlier studies have focused on marine deposits. We present a review of the factors that affect the whole-rock geochemical composition of terrestrial deposits and a case study to test how geochemical provenance differentiation can be made for such deposits. We confirm that both K2O/Na2O and immobile trace-element ratios are suitable provenance indicators for terrestrial deposits. We stress that previously developed discrimination schemes constructed for marine deposits of different depositional facies, specific grain size and texture (commonly greywacke) for identification of tectonic settings are unsuitable for terrestrial deposits as they often are related to different tectonic frame, depositional facies, and sorting degree. Different terrestrial tectonic situations will influence the detrital composition such that rift, foreland, and sag basins likely have different chemical compositions. Humid climatic conditions may reduce such differences. The case study is based on the intracontinental Permian Rotliegend Group and Early Triassic Buntsandstein Group and equivalents in central Europe, mainly Germany and Denmark. Both units had mainly felsic sources. We present results from > 1500 sedimentary samples from both published and unpublished data, mostly from sandstone. K2O/Na2O efficiently differentiates sandstone from different regions. The compositional variation is in line with reported variations in feldspar compositions and indicates local catchments. Thus, the feldspar has been preserved in the arid climate due to limited weathering. Y/Co, in combination with other indices (La/Sc, La/Lu, Ti/Nb, Th/Sc), is one of the most successful mafic-felsic trace-element indices that we use. We postulate that the trace-element variation is governed by mineral inclusions mainly in feldspar in addition to individual detrital grains. V/Zr and Zr/Sc mostly correlate with Y/Co, which indicates different zircon affinity in the source rocks rather than sorting. More dominance of felsic compositions and higher Zr/Sc for Triassic than Permian strata are in line with more sedimentary recycling during the Triassic than Permian. Thus, the results reveal that source-rock differentiation can be made for different geographical areas and stratigraphic units based on K2O/Na2O due to variations in feldspar compositions in the source areas, provided little chemical weathering. Based on the case study, the mafic-felsic trace-element ratios La/Sc, Th/Sc, Y/Co, and Ti/Nb seem most promising for provenance discrimination, in combination with La/Lu, and Zr/Sc and V/Zr as tracers of heavy minerals. We conclude that the combination of arid climatic conditions and terrestrial depositional environments makes it possible to use both major oxides and trace element ratios to reveal source-rock differences. For robust provenance interpretations, we recommend to focus on immobile elements that are little affected by grain-size variations, to combine several element ratios for interpretation, to avoid comparison of data produced by different methods (for instance x-ray fluorescence and mass spectrometry), and to complement geochemical investigations with data from other methods.

Lithic fragment

Felsic

Detritus

10.1016/j.sedgeo.2023.106496

Cite

Citations (4)

Facies and provenance analysis of Paleogene‐age alluvial conglomerates from the northern part of the Mesta Basin, SW Bulgaria

Geological Journal (2012)

Alena Ebinghaus T. McCann Carita Augustsson

The Mesta Basin in southwest Bulgaria is a graben that contains a Paleogene‐age siliciclastic and volcaniclastic succession deposited in alluvial and fluvial settings. A sedimentological analysis has shed light on conglomerate provenance, and the links between deposition and tectonic setting. Petrographical and chemical analysis of conglomerate clasts and matrix from the Dobrinishka, Gradinishka, Osikovo (or Osenovo) and Zlataritsa formations reveal both local, and more distal source provenance ages. The basal conglomerates are subdivided into three types, a lower and upper polymictic and a middle granitic conglomerate type. Petrographical and chemical analysis reveals granite, gneiss and amphibolite clasts that were sourced from the Sidironero–Mesta Unit of the Middle Allochthon of the Rhodope Metamorphic Complex, and the Rila–Rhodope Batholith to the east of the basin. Cathodoluminescence analysis of quartz sand grains reveals an increased input of red‐ and violet‐luminescent volcanic grains. Volcanic quartz in the oldest conglomerates indicates a hitherto unknown early (pre‐Oligocene) phase of volcanic activity in the vicinity of the Mesta Basin. The conglomerates were deposited in association with movement on the Ribnovo low‐angle normal fault during the Late Eocene, creating subsidence and the development of considerable accommodation space. The establishment of a fluvial environment followed subsequent Oligocene‐age volcanic activity. Copyright © 2012 John Wiley & Sons, Ltd.

Conglomerate

Siliciclastic

Paleogene

10.1002/gj.1348

Cite

Citations (3)

Geochemistry and detrital zircon geochronology of metasedimentary rocks in the Sierra Madre Terrane, Mexico: Implications of deposition along the western margin of Pangea

Geological Journal (2021)

Sonia Alejandra Torres-Sánchez Carita Augustsson Uwe Jenchen José Rafael Barboza-Gudiño Andreas Gärtner

The basement complex of the Sierra Madre region in north‐eastern Mexico is classified into four domains: (a) granulite facies rocks of Grenville age (ca. 1 Ga) known as the Novillo Gneiss, (b) the Palaeozoic Granjeno Schist, (c) an unmetamorphosed succession of Palaeozoic marine siliciclastic and volcanic rocks, and (d) an Ordovician plagiogranite body. We present a geochemical and provenance study of the metasedimentary rocks of the Granjeno Schist, which are associated with metavolcanic and meta‐ultramafic rocks. In the Granjeno Schist, trace element ratios (Th/Sc, La/Sch, La/Sc, and Zr/Sc) and REE compositions of the metasedimentary rocks are similar to values for the mean continental crust values and are consistent with derivation of detritus from felsic rocks. Chemical index of alteration values of 30–80 indicates low to moderate weathering of the source. The clastic metasedimentary rocks have moderately radiogenic Nd‐isotopic compositions with initial ε Nd( t ) values of −9 to −6, and model ages between 1.5 and 1.7 Ga. Ages of detrital zircon grains from the metasedimentary rocks are mostly 1.6–1.1 Ga, but some ages are 530–410 Ma. Such a Novillo Gneiss‐like age spectrum argues for short transport for the majority of zircon grains, with potential additional transport from the Maya Block. Na‐amphibole and mica geobarometer results of up to 6 kbar indicate high‐pressure subduction‐related metamorphism of the Granjeno Schist that was followed by a Pennsylvanian–Permian sub‐greenschist to greenschist metamorphic overprint in an accretionary prism. Thus, the Granjeno Schist is a representative of ocean‐plate stratigraphy that originated proximally close to a continent.

Greenschist

Felsic

Ultramafic rock

Protolith

10.1002/gj.4108

Cite

Citations (3)

Provenance of upper Paleozoic siliciclastics rocks from two high-latitude glacially influenced intervals in Bolivia

Journal of South American Earth Sciences (2019)

Katarzyna Kołtonik Peter E. Isaacson Agnieszka Pisarzowska Mariusz Paszkowski Carita Augustsson

Felsic

Diamictite

10.1016/j.jsames.2019.02.023

Cite

Citations (12)

Cathodoluminescence spectra of detrital quartz as provenance indicators for Paleozoic metasediments in southern Andean Patagonia

Journal of South American Earth Sciences (2003)

Carita Augustsson Heinrich Bahlburg

Devonian

Basement

Detritus

10.1016/s0895-9811(03)00016-6

Cite

Citations (31)

Provenance of early Paleozoic siliciclastic sandstones from NW Argentina - Results from an ongoing study on detrital zircons

GeCAS (2008)

Tobias Rüsing Carita Augustsson Ellen Kooijman Jasper Berndt Udo Zimmermann

Siliciclastic

Source

Cite

Citations (0)

Petrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floor

Open Geosciences (2017)

Sonia Alejandra Torres-Sánchez Carita Augustsson Uwe Jenchen José Rafael Barboza-Gudiño Eduardo Alejandro Alemán‐Gallardo

Abstract The Granjeno Schist is a meta-volcanosedimentary upper Paleozoic complex in northeastern Mexico. We suggest different tectonic settings for metamorphism of its serpentinite and talc-bearing rocks based on petrographic and geochemical compositions. According to the REE ratios (La

Ultramafic rock

10.1515/geo-2017-0029

Cite

Citations (14)

Lapilli tuff as evidence of Early Jurassic Strombolian-type volcanism in Scania, southern Sweden

GFF (2001)

Carita Augustsson

Abstract Central Scania, southernmost Sweden, is penetrated by more than one hundred basaltic volcanic necks of Jurassic age. Pyroclastics, related to the volcanic necks, have been investigated to reveal the volcanic environment, and the eruptive character required to produce the pyroclastics. Based on textural and petrographical evidence, a Strombolian-type eruptive character is suggested. The sediment, a lapilli tuff, is clay altered due to early diagenetic processes, but traces of palagonite reveal a former basaltic composition of the lapilli tuff. The volcanoes were part of a monogenetic volcanic field and deposition of the pyroclastic sediment took place on land, probably close to oceanic water.

Lapilli

Strombolian eruption

10.1080/11035890101231023

Cite

Citations (9)