Tobias Rüsing

University of Münster

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Carita Augustsson

University of Stavanger

Ellen Kooijman

Swedish Museum of Natural History

Udo Zimmermann

University of Stavanger

Jasper Berndt

University of Münster

Christopher Adams

Georgia Institute of Technology

Hans Niemeyer

Universidad Católica del Norte

Mert Kocabayoǧlu

University of Münster

Mareike Büld

University of Basel

Hannah E. Chmiel

École Polytechnique Fédérale de Lausanne

Heinrich Bahlburg

University of Münster

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University of Münster

University of Stavanger

University of Göttingen

Heidelberg University

Goethe University Frankfurt

Medical College of Wisconsin

Karlsruhe Institute of Technology

Goethe Institute

Chinese Academy of Sciences

Johannes Gutenberg University Mainz

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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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Detrital Quartz and Zircon Combined: The Production of Mature Sand with Short Transportation Paths Along the Cambrian West Gondwana Margin, Northwestern Argentina

Journal of Sedimentary Research (2011)

Carita Augustsson Tobias Rüsing Christopher Adams Hannah E. Chmiel Mert Kocabayoǧlu

Abstract Quartz, the most common mineral in most sandstones, rarely is used in provenance studies. This study demonstrates the provenance-discriminatory potential of combining cathodoluminescence (CL) color wavelength spectra of quartz with morphology and in situ U-Pb ages of zircon. The Cambrian Meson Group in northwestern Argentina is used for the test of this combined methodology, because it is composed of nonmetamorphosed sandstones with > 90% quartz and a dominance of zircon among the heavy minerals. Correlation of the results from the two methods is evident: (1) both CL spectra typical for bright-luminescent quartz (red to blue; > 90%) and oscillatory zircon growth zoning (80–90%) indicate a dominance of magmatic detritus. (2) Upsection, diminishing input from euhedral 510–600 Ma zircons (70% at the base) correlates with lower amounts of volcanic quartz (40% red and violet grains at the base). Instead, plutonic quartz and abraded zircons of 550–700 Ma age prevail. The data point to the occurrence of a (nearly) synsedimentary volcanic phase, which has not been known previously. Furthermore, initial short transportation paths from nearby magmatic bodies (100–200 km) can be assumed, because of the low degree of grain abrasion and an age correlation with magmatic bodies in the region, such as the Santa Rosa de Tastil batholith, here dated at 513 +4/−5 Ma. The proximity to the source area at an initial stage indicates first-cycle sand. The maturity was probably reached by intense chemical weathering. The upsection-diminishing young, volcanic input indicates erosion of the volcanic source within a time period of millions of years. At that stage, mainly up to 1000-km-long coast-parallel transport from the Sierras Pampeanas in the south fed the depositional basin. The change in—and expansion of—the main source areas record a change to production of multicycle sand. Hence, the maturity was partly caused by sedimentary recycling. More generally, the provenance-discriminative effect of the CL of quartz, which has been doubted by some researches, can be confirmed. Therefore, the results imply that both quartz and zircon should be taken into account in provenance studies of quartz arenites.

Margin (machine learning)

10.2110/jsr.2011.23

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

Journal of the Geological Society (2015)

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. Supplementary material: U–Pb data, CL images, and detailed geological maps are available at www.geolsoc.org.uk/SUP18796 .

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10.1144/jgs2014-065

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The crustal evolution of South America from a zircon Hf‐isotope perspective

Terra Nova (2016)

Carita Augustsson Arne P. Willner Tobias Rüsing Hans Niemeyer Axel Gerdes

Abstract Hf‐isotope data of >1100 detrital zircon grains from the Palaeozoic, south‐central Andean Gondwana margin record the complete crustal evolution of South America, which was the predominant source. The oldest grains, with crustal residence ages of 3.8–4.0 Ga, are consistent with complete recycling of existing continental crust around 4 Ga. We confirm three major Archaean, Palaeoproterozoic (Transamazonian) and late Mesoproterozoic to early Neoproterozoic crust‐addition phases as well as six igneous phases during Proterozoic to Palaeozoic time involving mixing of juvenile and crustally reworked material. A late Mesoproterozoic to early Neoproterozoic, Grenville‐age igneous belt can be postulated along the palaeo‐margin of South America. This belt was the basement for later magmatic arcs and accreted allochthonous microcontinents as recorded by similar crustal residence ages. Crustal reworking likely dominated over juvenile addition during the Palaeozoic era, and Proterozoic and Archaean zircon was mainly crustally reworked from the eroding, thickened Ordovician Famatinian arc.

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Continental arc

10.1111/ter.12200

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Revealing provenance of quartz-rich sandstones using detrital quartz and zircon as source rock indicators: an example from the Cambrian of NW Argentina

EGUGA (2010)

Carita Augustsson Tobias Rüsing Christopher Adams Udo Zimmermann Hannah E. Chmiel

(1) Institut fur Geologie und Palaontologie, Westfalische Wilhelms-Universitat Munster, Corrensstrasse 24, 48 149 Munster, Germany (augustss@uni-muenster.de), (2) GNS Science, P. O. Box 30368, Lower Hutt, New Zealand, (3) Institutt for Petroleumsteknologi, Universitetet i Stavanger, 4036 Stavanger, Norway, (4) Institut fur Geologie und Palaontologie, Universitat Basel, Bernoullistrasse 32, 4056 Basel, Switzerland, (5) Institut fur Mineralogie, Westfalische Wilhelms-Universitat Munster, Corrensstrasse 24, 48149 Munster, Germany

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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

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