Carita Augustsson

University of Stavanger

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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

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Provenance of the El Salto Formation (early Oligocene to early Miocene), southern part of La Reforma caldera, Baja California Sur, Mexico

Geological Society of America eBooks (2021)

Yam Zul Ernesto Ocampo-Díaz Sonia Alejandra Torres-Sánchez Carita Augustsson José Luis Macías Giovanni Sosa-Ceballos

ABSTRACT This study documented the stratigraphy and provenance of the El Salto Formation in southern Baja California, Mexico, which represents an early Oligocene–early Miocene forearc basin developed during the subduction of the Farallon plate, in the immediate vicinity of La Reforma caldera, central part of Baja California Sur, Mexico. In the study area, El Salto Formation consists of three stratigraphic members. The lower member is characterized by intercalations of sandstones and conglomeratic sandstones that exhibit eolian large-scale cross-stratification. U-Pb detrital zircon geochronology implies maximum depositional ages of ca. 33–31 Ma. The middle member is characterized by successions of conglomeratic sandstones and sandstones with eolian and tidal large-scale cross-stratification. The member also contains ignimbrites, tuff, and andesite deposits, and its maximum deposition age is ca. 30–28 Ma. The ignimbrite collected at the top of this member has a crystallization age of ca. 28 Ma. The upper member is characterized by conglomerates, sandstones, and shales, with maximum depositional ages ranging from 28 to 23 Ma. Petrographically, sandstones of the El Salto Formation are composed of three petrofacies. Petrofacies A is rich in quartz with a greater contribution of felsitic volcanic lithic grains (Q55F21L24; recycled orogenic provenance). Petrofacies B is rich in lathwork and microlitic volcanic lithic fragments with minor contributions of quartz and feldspar (Q39F12L42; recycled orogenic and dissected arc), while petrofacies C is rich in microlitic volcanic fragments and lathwork with subordinate quartz and feldspar (Q21F25L54; transitional arc setting). U-Pb ages of >600 zircon grains from nine samples contained three populations: (1) 35–23 Ma (early and late Oligocene; 22% of all grains), (2) 120–60 Ma (Cretaceous; 32%), and (3) 170–140 Ma (Middle Jurassic–Early Cretaceous; 46%). Detrital zircon grains with ages of ca. 40–20 Ma showed rare earth element patterns and trace-element ratios similar to those formed in a continental arc. Volcanic rocks sampled in this work contained chemical signatures, including Nb, Pb, and Rb anomalies, that indicate their magmas were created in a subduction zone. In addition, high concentrations of heavy rare earth elements (La/Yb = 14–19) suggest that the magmas contain a component of partial melting of the mantle wedge and crust, probably as a result of asthenospheric upwelling. These features support a model in which the El Salto Formation was developed due to the rollback of the Farallon plate in the period 50–25 Ma.

Paleocurrent

Lithic fragment

Volcanic arc

Forearc

Conglomerate

10.1130/2021.2546(11)

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Petrological, geochemical (major, trace, and rare earth elements), and U–Pb zircon data of the Tamatán Group, NE Mexico

Data in Brief (2021)

Juan Moisés Casas‐Peña Juan Alonso Ramírez Fernández Fernando Velasco-Tapia Eduardo Alejandro Alemán‐Gallardo Carita Augustsson

From samples of the Paleozoic Tamatán Group (Huizachal–Peregrina Anticlinorium, Tamaulipas, Mexico), petrographic (qualitative and modal) and geochemical analyses (major, trace, and rare earth elements) were conducted. The first U–Pb geochronological data on detrital zircons of the Tamatán Group were generated using four samples. The data presented here contains a broad overview of photomicrography, recalculated modal point-count data, raw geochemical data, and simple statistics of selected geochemical parameters. The data presented in this article are interpreted and discussed in the research article titled "Provenance and tectonic setting of the Tamatán Paleozoic sequence, NE Mexico: Implications for the closure of the Rheic Ocean at the northwestern part of Gondwana" [1].

10.1016/j.dib.2021.106846

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Citations (2)

Provenance and depositional conditions of Cretaceous–Paleogene boundary sandstones from northeastern Mexico

Sedimentary Geology (2012)

Stephanie Rehrmann Carita Augustsson Rocio Nereyda Izaguirre Valdez Uwe Jenchen P. Schulte

Paleogene

10.1016/j.sedgeo.2012.10.002

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Citations (4)

Metamorphic and volcanic quartz of the siliciclastic Tipuma Formation, West Papua, Indonesia: an insight into Triassic palaeogeography of northern Australia

EGUGA (2013)

Indra Gunawan Robert Hall Carita Augustsson

Palaeogeography

Siliciclastic

Source

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0.3 byr of drainage stability along the Palaeozoic palaeo-Pacific Gondwana margin; a detrital zircon study

Figshare (2016)

Carita Augustsson Tobias Rüsing Hans Niemeyer Ellen Kooijman Jasper Berndt

The palaeo-Pacific margin of Gondwana in the present-day south–central Andes is marked by tectonic activity related to subduction and terrane accretion. We present detrital zircon U–Pb data encompassing the Palaeozoic era in northern Chile and northwestern Argentina. Cathodoluminescence images reveal dominantly magmatic zircon barely affected by abrasion and displaying only one growth phase. The main age clusters for these zircon grains are Ediacaran to Palaeozoic with an additional peak at 1.3–0.9 Ga and they can be correlated with ‘Grenvillian’ age, and the Brasiliano, Pampean, and Famatinian orogenies. The zircon data reveal main transport from the nearby Ordovician Famatinian arc and related rocks. The Silurian sandstone units are more comparable with Cambrian units, with Brasiliano and Transamazonian ages (2.2–1.9 Ga) being more common, because the Silurian deposits were situated within or east of the (extinct) Famatinian arc. Hence, the arc acted as a transport barrier throughout Palaeozoic time. The complete suite of zircon ages does not record the accretions of exotic terranes or the Palaeozoic glacial periods. We conclude that the transport system along the palaeo-Pacific margin of Gondwana remained stable for c. 0.3 byr and that provenance data do not necessarily reflect the interior of a continent. Hence, inherited geomorphological features must be taken into account when detrital mineral ages are interpreted.

Margin (machine learning)

10.6084/m9.figshare.3453863

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Active or passive continental margin? Geochemical and Nd isotope constraints of metasediments in the backstop of a pre-Andean accretionary wedge in southernmost Chile (46°30′-48°30′S)

Geological Society London Special Publications (2003)

Carita Augustsson Heinrich Bahlburg

Abstract Provenance analysis of siliciclastic sedimentary rocks gives indications of the tectonic evolution and setting of source regions and the rocks contained in them. The composition of sedimentary rocks ideally reflects the nature of these regions, and only indirectly the tectonic setting of the basin where the erosional debris is deposited. This makes it possible to interpret Late Devonian to Early Carboniferous metasedimentary basement rocks of the Andes in southernmost Chile as having been deposited at a passive margin, despite geochemical indications of an active margin setting for the source rocks, and the position of the metasediments in the backstop of an accretionary wedge. Major and trace elements point to felsic source rocks from an active margin environment. The Nd model ages of 1170–1490 Ma indicate that the source rocks were part of an old continental crust in the Late Palaeozoic. The ɛ Nd (T) values range between −7 and −2. These characteristics, in combination with the regional geology, suggest that the geochemical signal is dominated by rocks formed at an active margin, which later acted as feeders for the sediments deposited in a passive-margin environment. If corroborated by research in progress this emphasizes the problem of deducing the tectonic setting of a depositional basin from provenance data.

Accretionary wedge

Continental Margin

Passive margin

Wedge (geometry)

Margin (machine learning)

Isotope Geochemistry

10.1144/gsl.sp.2003.208.01.12

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Citations (36)

Magmatic source and metamorphic grade of metavolcanic rocks from the Granjeno Schist: was northeastern Mexico a part of Pangaea?

Geological Journal (2015)

Sonia Alejandra Torres-Sánchez Carita Augustsson José Rafael Barboza-Gudiño Uwe Jenchen Juan Alonso Ramírez Fernández

Abstract The geochemistry of the metavolcanic rocks from the Granjeno Schist in northeastern Mexico indicates an origin in different tectonic environments: mid‐ocean ridge and ocean island. High ratios of Hf/Th and Th/Nb (4.4–14 and 0.08–0.15), low ratios of LaN/YbN and LaN/SmN (0.74–1.7 and 0.60–1.4) and depleted LREE patterns in metabasalt display mid‐ocean ridge characteristics. In contrast, the pattern of trace‐element ratios and REEs in metabasalt and metapillow lava 60 km to the west indicates a magma source with ocean‐island basalt characteristics. Both areas were metamorphosed during the Late Carboniferous (300 ± 4 Ma). Estimated metamorphic conditions deduced from white mica and chlorite compositions, distinguish greenschist facies (350 °C and 4 kbar) for the mid‐ocean ridge basalt, and prehnite–pumpellyite facies (250 °C and 2.5 kbar) for the ocean‐island‐type basalt. This metamorphism took place at an active continental margin during Pennsylvanian time. Our new tectonic model, which differs from earlier models, suggests that the origin of the Granjeno Schist is related to a subduction zone located at the western margin of Pangaea, active after Laurentia–Gondwana collision. Copyright © 2015 John Wiley & Sons, Ltd.

Pillow lava

Greenschist

Continental Margin

Laurentia

10.1002/gj.2702

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Citations (17)

Zircon size-age sorting and source-area effect: The German Triassic Buntsandstein Group

Sedimentary Geology (2017)

Carita Augustsson Thomas Voigt Kristin Bernhart Marian Kreißler Reinhard Gaupp

Massif

Detritus

10.1016/j.sedgeo.2017.11.004

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Citations (45)

Provenance, depositional setting and diagenesis as keys to reservoir quality of the Lower Cretaceous in the SW Barents Sea

Marine and Petroleum Geology (2021)

Angelica Ärlebrand Carita Augustsson A. Escalona Sten‐Andreas Grundvåg Dora Marín

This study examines the role of the depositional environment for the final reservoir quality in four Lower Cretaceous sandstone reservoirs in the southwestern Barents Sea by linking facies to the distribution of primary textures, composition, and diagenetic alteration. Facies analysis reveals slope-to-basin-floor, distal shallow-marine, and deltaic depositional environments. The slope-to-basin-floor sandstone has the highest porosity of 3–19% (avg. 13%). It is attributed to good sorting, non-pervasive carbonate cementation that inhibited compaction and allowed for secondary porosity through later dissolution, and moderate clay infiltration that resulted in clay cutanes on grain rims and the precipitation of chlorite (which inhibited quartz growth). For the deltaic sandstone, moderate to fluctuating energy and sediment supply provided good conditions for mechanical clay infiltration and varying porosity of 2–18% (avg. 8%). The distal shallow-marine sandstone reservoir has the lowest porosity of 1–12% (avg. 7%). Based on its fine-grained and bioturbated character, deposition in a low-energy environment with low sediment supply seems likely. The combination of fine-grained lamina, interstitial matrix and bioturbation led to porosity reduction. Abundant mica and feldspar grains in the shallow-marine sandstone, partly a result of the provenance, and deep burial also resulted in extensive illitization. High mineralogical maturity, much monocrystalline quartz in the quartz-grain populations, and similar felsic chemical rock compositions for all facies associations and wells indicate similar source rocks with some variations. Abundant mechanically unstable mica makes the nearby Loppa High a plausible catchment, which is supported by the seismic geometries. This study demonstrates that the porosity evolution of the studied Lower Cretaceous sandstone reservoirs is determined mainly by the depositional environment despite minor provenance and major diagenetic variations.

Lithic fragment

10.1016/j.marpetgeo.2021.105217

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Citations (16)

Provenance of lower Cambrian quartz arenite on southwestern Baltica: Weathering versus recycling

Journal of Sedimentary Research (2020)

Sanne Lorentzen Tonje Iren Braut Carita Augustsson Johan Petter Nystuen Jens Jahren

ABSTRACT Lower Cambrian quartz arenite deposits have a world-wide occurrence and are also present on Baltica. However, the processes influencing the deposits from source to sink have not been accordingly investigated. The provenance of these deposits is crucial for the understanding of the extent of chemical weathering in the cratonic drainage area and reworking at the broad shallow shelves of Baltica during early Cambrian time. Provenance analysis and study of weathering effects was done for lower Cambrian sandstone from southern Scandinavia, including southern Norway, southern Sweden, and Bornholm (Denmark). For the quartz-arenite sandstone of the Ringsaker Member and the Hardeberga Formation, predominantly moderately weathered felsic–intermediate plutonic and meta-igneous source terranes are suggested from negative Eu anomalies, high LaN/YbN, and low to moderate Ti/Nb ratios, as well as trace amounts of plutonic lithoclasts. Similarly, a felsic–intermediate igneous and metamorphic signature is indicated in the heavy-mineral assemblage and a dominance of dark cathodoluminescence of quartz in a special study of samples from Bornholm, thus suggesting a mixed provenance of local granitoid–orthogneissic Mesoproterozoic basement and distant sources from the Transscandinavian Igneous Belt for the Hardeberga Formation on Bornholm. High percentages of mostly rounded ultra-stable heavy-mineral grains, quartz, and extremely high SiO2/Al2O3 ratios indicate a compositionally and texturally mature sand that was subjected to extensive to moderate weathering following removal of detritus from the source area. The main controls on the alteration of framework composition and the heavy-mineral assemblage are interpreted as surface weathering, based on moderate Chemical Index of Alteration values and meteoric flushing, and reworking by waves, based on an estimated low amount of feldspar before burial. Thus, the maturation of lower Cambrian quartz arenite on southwestern Baltica can be ascribed to a combination of processes including weathering in the source-rock area, extensive reworking, and early diagenesis. This study also highlights the importance of understanding alteration processes affecting the deposits from source to sink, and to be careful to describe quartz-rich rocks as simply recycled deposits.

Felsic

Arenite

Baltica

Detritus

Heavy mineral

10.2110/jsr.2020.20

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Citations (5)