Sediment generation in modern glacial settings: Grain-size and source-rock control on sediment composition

Eynatten, Hilmar von; Tolosana‐Delgado, Raimon; Karius, Volker

doi:10.1016/j.sedgeo.2012.03.008

Cited by 106 publications

(60 citation statements)

References 39 publications

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“…turn by grain size and hydrodynamic processes during transport and deposition (Garzanti et al, 2008(Garzanti et al, , 2009von Eynatten et al, 2012).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Provenance control on chemical indices of weathering (Taiwan river sands)

Garzanti

Resentini

2016

Sedimentary Geology

187

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“…turn by grain size and hydrodynamic processes during transport and deposition (Garzanti et al, 2008(Garzanti et al, , 2009von Eynatten et al, 2012).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Provenance control on chemical indices of weathering (Taiwan river sands)

Garzanti

Resentini

2016

Sedimentary Geology

187

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“…Von Eynatten et al (2012) point out that mechanical processes, such as comminution, impact sediment composition. They further showed that increases in Al 2 O 3 and decreases in SiO 2 concentrations occur with finer grain sizes.…”

Section: Siomentioning

confidence: 99%

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Minyuk¹,

Borkhodoev²,

Wennrich

2014

Clim. Past

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Abstract. Geochemical analyses were performed on sediments recovered by deep drilling at Lake El'gygytgyn in central Chukotka, northeastern Russia (67 • 30 N; 172 • 05 E). Major and rare element concentrations were determined using X-ray fluorescence spectroscopy (XRF) on the < 250 µm fraction from 617 samples dated to ca. 440 and 125 ka, which approximates marine isotope stages (MIS) 11 to 6. The inorganic geochemistry indicates significant variations in elemental composition between glaciations and interglaciations. Interglacial sediments are characterized by high contents of SiO 2 , Na 2 O, CaO, K 2 O, and Sr and are depleted in Al 2 O 3 , Fe 2 O 3 , TiO 2 , and MgO. An extreme SiO 2 enrichment during MIS 11.3 and 9.3 was caused by an enhanced flux of biogenic silica (BSi). The geochemical structure of MIS 11 shows similar characteristics as seen in MIS 11 records from Lake Baikal (southeastern Siberia) and Antarctic ice cores, thereby arguing for the influence of global forcings on these records. High sediment content of TiO 2 , Fe 2 O 3 , MgO, Al 2 O 3 , LOI, Ni, Cr, and Zr typifies glacial stages, with the most marked increases during MIS 7.4 and 6.6. Reducing conditions during glacial times are indicated by peaks in the Fe 2 O 3 content and coinciding low Fe 2 O 3 /MnO ratios. This conclusion also is supported by P 2 O 5 and MnO enrichment, indicating an increased abundance of authigenic, fine-grained vivianite. Elemental ratios (CIA, CIW, PIA, and Rb/Sr) indicate that glacial sediments are depleted in mobile elements, like Na, Ca, K and Sr. This depletion was caused by changes in the sedimentation regime and thus reflects environmental changes.

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“…Several techniques exist to analyse different mineral grains and every single grain preserves information about the tectonic and erosional history of the source areas (e.g., Garzanti et al, 2009;von Eynatten et al, 2012). However, numerous processes during the sedimentary cycle can affect the detrital grain signature (e.g., Morton & Hallsworth,we sampled three different small catchment areas in the Western Gneiss Region in order to test if the heavy-mineral and garnet geochemistry of the stream samples for the commonly used grainsize fraction of 63-125 µm reflects the geological situation in the source area.…”

Section: Introductionmentioning

confidence: 99%