Towards identifying the origin of metamorphic components in Austrian loess: insights from detrital rutile chemistry, thermometry and U–Pb geochronology

Újvári, Gábor; Klötzli, Urs; Kiraly, Franz; Ntaflos, Theodoros

doi:10.1016/j.quascirev.2013.06.002

Cited by 29 publications

(7 citation statements)

References 74 publications

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“…to 150-200 µm in size in loess are transported in saltation by wind and the transport is short-term (Tsoar and Pye 1987;Újvári et al 2013). This holds true even if large (>75 µm) quartz grains are transported for long distances (several thousands of kilometers) in some rare cases (Betzer et al 1998).…”

Section: Discussionmentioning

confidence: 99%

U–Pb ages and Hf isotopic composition of zircons in Austrian last glacial loess: constraints on heavy mineral sources and sediment transport pathways

Újvári

Klötzli

2015

Int J Earth Sci (Geol Rundsch)

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Abstract:Loess sediments in Austria deposited ca. 30-20 ka ago yield different zircon age signatures for samples collected around Krems (SE Bohemian Massif; samples K23 and S1) and Wels (half-way between the Bohemian Massif and the Eastern Alps; sample A16). CL imaging reveals both old, multi-stage zircons with complex growth histories and inherited cores, and young, first cycle magmatic zircons. Paleoproterozoic ages between 2200 and 1800 Ma (K23 and S1), an age gap of 1800-1000 Ma for S1 and abundant Cadomian grains indicate NW African/North Gondwanan derivation of these zircons. Also A16 yields ages between 630-600 Ma that can be attributed to 'Pan-African' orogenic processes. Significant differences are seen for the <500 Ma part of the age spectra with major age peaks at 493-494 Ma and 344-335 Ma (K23 and S1), and 477 and 287 Ma (A16). All three samples show negative initial ɛHf signatures (-25 to -10, except one grain with +9.4) implying zircon crystallization from magmas derived by recycling of older continental crust. Hf isotopic compositions of 330-320 Ma old zircons from S1 and K23 preclude a derivation from Bavarian Forest granites and intermediate granitoids. Rather all the data suggest strong contributions of eroded local rocks (South Bohemian pluton, Gföhl unit) to loess material at the SE edge of the Bohemian Massif (K23 and S1), and sourcing of zircons from sediment donor regions in the Eastern Alps for loess at Wels (A16). We tentatively infer primary fluvial transport and secondary aeolian reworking and re-deposition of detritus from western/southwestern directions. Finally, our data highlight that loess zircon ages are fundamentally influenced by fluvial transport, its directions, the interplay of sediment donor regions through the mixing of detritus and zircon fertility of rocks, rather than paleo-wind directions. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation Response to reviewersReviewer #1: Review of manuscript IJES-D-14-00245R1The authors did a good job in revising the manuscript according to the reviewers comments. Only a few minor issues still need some attention, as outlined below. After that the manuscript will be ready for publication without further review. Thank you!

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Section: Discussionmentioning

confidence: 99%

U–Pb ages and Hf isotopic composition of zircons in Austrian last glacial loess: constraints on heavy mineral sources and sediment transport pathways

Újvári

Klötzli

2015

Int J Earth Sci (Geol Rundsch)

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“…Some initial attempts at this have been made in Chinese loess, combining zircon U-Pb dating with zircon fission-track and heavy mineral analysis (Stevens et al, 2013a; Nie et al, 2014, 2015) and with garnet chemistry (Fenn et al, 2017). In central-eastern European loess deposits, attempts have been made to combine zircon U-Pb dating with both geochemistry of rutile (Újvári et al, 2013) and zircon Hf isotopes (Újvári and Klötzli, 2015), as well as bulk geochemical indicators (Újvári et al, 2012). Zircon U-Pb analyses have also been combined with Pb isotope analysis of isolated aliquots of K-feldspars in loess in the United States (Aleinikoff et al, 1999, 2008).…”

Section: Methodsological Approaches To the Study Of Loessmentioning

confidence: 99%

“…Zircon U-Pb analyses have also been combined with Pb isotope analysis of isolated aliquots of K-feldspars in loess in the United States (Aleinikoff et al, 1999, 2008). Garnet type and rutile trace element composition in particular have great potential to complement zircon U-Pb dating, especially where source terranes show overlapping zircon U-Pb ages but are composed of rocks of varying metamorphic grade and formation temperatures (Újvári et al, 2013; Fenn et al, 2017).…”

Section: Methodsological Approaches To the Study Of Loessmentioning

confidence: 99%

Approaches and challenges to the study of loess—Introduction to the LoessFest Special Issue

et al. 2018

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In September 2016, the annual meeting of the International Union for Quaternary Research’s Loess and Pedostratigraphy Focus Group, traditionally referred to as a LoessFest, met in Eau Claire, Wisconsin, USA. The 2016 LoessFest focused on “thin” loess deposits and loess transportation surfaces. This LoessFest included 75 registered participants from 10 countries. Almost half of the participants were from outside the United States, and 18 of the participants were students. This review is the introduction to the special issue forQuaternary Researchthat originated from presentations and discussions at the 2016 LoessFest. This introduction highlights current understanding and ongoing work on loess in various regions of the world and provides brief summaries of some of the current approaches/strategies used to study loess deposits.

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“…As such, there is a need for the development of single-grain loess provenance methods that will complement these zircon analyses. Indeed, multi-proxy approaches may be the only way to resolve complex provenance questions such as loess sources (Tyrrell et al, 2012), and are being shown to be effective in European loess deposits (Újvári et al, 2013). Here, we have presented the results of the first garnet geochemistry application to loess sediments.…”

Section: Implications For Provenance Analysismentioning

confidence: 99%

“…The development of garnet type or other single grain provenance indicators requires substantial investment in characterising potential source rocks, for which few datasets exist currently. Additional lines of approach would be to obtain multiple lines of data from single zircon grains, as through the application of Hf isotopes to zircons dated using U-Pb (Újvári and Klötzli, 2015), as well as the use of other indicators such as heavy mineral assemblages (Stevens et al, 2013b; Bird et al, 2015) or rutile chemistry (Újvári et al, 2013). In any case, a key challenge now in loess provenance research is to identify complementary approaches that can address ambiguities inherent in U-Pb zircon dating results.…”

Section: Implications For Provenance Analysismentioning

confidence: 99%

Insights into the provenance of the Chinese Loess Plateau from joint zircon U-Pb and garnet geochemical analysis of last glacial loess

et al. 2017

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The Chinese Loess Plateau, the world’s largest and oldest loess record, preserves evidence of Asia’s long-term dust source dynamics, but there is uncertainty over the source of the deposits. Recent single-grain detrital zircon U-Pb age analysis has progressed this issue, but debates remain about source changes, and the generation and interpretation of zircon data. To address this, we analyze different groupings of new and existing datasets from the Loess Plateau and potential sources. We also present the results of a first high resolution sampling, multi-proxy provenance analysis of Beiguoyuan loess using U-Pb dating of detrital zircons and detrital garnet geochemistry. The data shows that some small source differences seem to exist between different areas on the Loess Plateau. However, sediment source appears to be unchanging between loess and palaeosols, supporting a recent material recycling hypothesis. Our zircon and garnet data demonstrates, however, that Beiguoyuan experienced a temporary, abrupt source shift during the last glacial maximum, implying that local dust sources became periodically active during the Quaternary. Our results highlight that grouping data to achieve bigger datasets could cause identification of misleading trends. Additionally, we suggest that multi-proxy single-grain approaches are required to gain further insight into Chinese Loess Plateau dust sources.

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Towards identifying the origin of metamorphic components in Austrian loess: insights from detrital rutile chemistry, thermometry and U–Pb geochronology

Cited by 29 publications

References 74 publications

U–Pb ages and Hf isotopic composition of zircons in Austrian last glacial loess: constraints on heavy mineral sources and sediment transport pathways

U–Pb ages and Hf isotopic composition of zircons in Austrian last glacial loess: constraints on heavy mineral sources and sediment transport pathways

Approaches and challenges to the study of loess—Introduction to the LoessFest Special Issue

Insights into the provenance of the Chinese Loess Plateau from joint zircon U-Pb and garnet geochemical analysis of last glacial loess

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