Relative differences between glacially crushed quartz transported by mountain and continental ice; some examples from North America and East Africa

Mahaney, William C.; Vortisch, Walter; Julig, Patrick J.

doi:10.2475/ajs.288.8.810

Cited by 75 publications

(55 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Breakage textures are present with the highest frequency in the upper five samples, but grains in all of the study samples bear many of these textures. Edge abrasion, a mechanical texture that is reported by many workers to be associated with glacial transport (Whalley, 1978;Whalley and Langway, 1980, Figure 3;Dowdeswell, 1982, Figure 5; Sharp and Gomez, 1986;Mahaney et al, 1988), is present in all five samples. In addition, grains from sample 5, from 600 mbsf, also bear striations and straight grooves ( Figures 5B and D).…”

Section: Samples 10 and 11mentioning

confidence: 90%

Surface textural analysis of quartz sand grains from ODP Site 918 off the southeast coast of Greenland suggests glaciation of southern Greenland at 11 Ma

Helland

Holmes

1997

Palaeogeography, Palaeoclimatology, Palaeoecology

119

View full text Add to dashboard Cite

Section: Samples 10 and 11mentioning

confidence: 90%

Surface textural analysis of quartz sand grains from ODP Site 918 off the southeast coast of Greenland suggests glaciation of southern Greenland at 11 Ma

Helland

Holmes

1997

Palaeogeography, Palaeoclimatology, Palaeoecology

119

View full text Add to dashboard Cite

“…6B). Conchoidal fractures defined by Campbell and Thompson (1991), Mahaney (1991Mahaney ( , 1995, Mahaney et al (1988aMahaney et al ( , 1988bMahaney et al ( , 1996Mahaney et al ( , 2001, Mahaney and Kalm (2000), Mazzullo and Ritter (1991), and Strand et al (2003) also characterize the surface of 19% of magnetite grains in till samples (Fig. 6B).…”

Section: Mechanical Microtexturesmentioning

confidence: 92%

“…6F; Krinsley and Donahue, 1968;Campbell and Thompson, 1991;Helland and Diffendal, 1993;Mahaney et al, 1988aMahaney et al, , 1988bMahaney and Andres, 1996;Mahaney et al, 2001Mahaney et al, , 2004Mahaney, 1990bMahaney, , 1995Vos et al, 2014). These textures are restricted to coarse grains (≥ 0.4 mm) with surfaces large enough to be scratched by other grains during transport (Margolis and Krinsley, 1974).…”

Section: Mechanical Microtexturesmentioning

confidence: 98%

The surface texture and morphology of magnetite from the Izok Lake volcanogenic massive sulfide deposit and local glacial sediments, Nunavut, Canada: Application to mineral exploration

Makvandi

Beaudoin

McClenaghan

et al. 2015

Journal of Geochemical Exploration

View full text Add to dashboard Cite

“…First, according to the theory of the structure and the movement of mountain glaciers [33], it is possible for the debris that the glacier carries to be exposed. In addition, the debris is subject to grinding during this movement, and the high silt content in glacial deposits could indicate this [34,35]. Second, the absorption band of Ge centers is 4.43 eV [36], corresponding to a wavelength of 280 nm.…”

Section: Methodsmentioning

confidence: 99%

Quaternary glacial geomorphology and glaciations of Kongur Mountain, eastern Pamir, China

Wang

Zhou

Jing-bo

et al. 2011

Sci. China Earth Sci.

View full text Add to dashboard Cite

Kongur Mountain is the largest center of modern glaciation on the Pamir Plateau. During the glacial-interglacial cycles of the Quaternary, Kongur Mountain was extensively and repeatedly glaciated, and the glacial landforms from multiple glaciations are well-preserved in valleys, in basins, and on the piedmonts. Dating samples have been collected according to the distribution and weathering of the glacial tills, the relationship among the glacial deposits, and the loess or soil developed on the moraines. Electron spin resonance (ESR) dating of the samples was done using the germanium (Ge) centers in the glacial quartz grains, which are sensitive to both sunlight and grinding. The ages of the glacial deposits can be divided into four clusters, i.e., 13.1±0.8-27.0±2.2, 36.4±3.3-48.7±5.7, 65.6±6.8-86.6±8.9, and 105.6±9.4-178.3±17.8 ka. Six glacial advances in this region have been confirmed, which are equivalent in age to the Little Ice Age (LIA), Neoglaciation, marine oxygen isotope stages (MIS) 2, mid-MIS3, MIS4, and MIS6. The largest local last glacial maximum (LGM L ) occurred during MIS4 rather than the global Last Glacial Maximum (LGM G ) of MIS2, and a glacial advance that occurred during mid-MIS3 was also larger than the LGM G . Furthermore, deeply weathered tills below 3500 m a.s.l. on the western slope of Kongur Mountain, when compared with the ages of the oldest glaciation of the Muztag Ata region, likely occurred prior to the penultimate glacial cycle. The glacial landforms prior to the penultimate glacial cycle on the northern slope are not well-preserved due to erosion after deposition. Several glacial deposits are only speculated to be distributed at higher elevations on the southwest side of the Gaizi Checkpoint. The extensive hummocky moraines on the western slope were formed by multiple glacial advances, and the latest glacial advance corresponded to mid-MIS3.

show abstract

Relative differences between glacially crushed quartz transported by mountain and continental ice; some examples from North America and East Africa

Cited by 75 publications

References 0 publications

Surface textural analysis of quartz sand grains from ODP Site 918 off the southeast coast of Greenland suggests glaciation of southern Greenland at 11 Ma

Surface textural analysis of quartz sand grains from ODP Site 918 off the southeast coast of Greenland suggests glaciation of southern Greenland at 11 Ma

The surface texture and morphology of magnetite from the Izok Lake volcanogenic massive sulfide deposit and local glacial sediments, Nunavut, Canada: Application to mineral exploration

Quaternary glacial geomorphology and glaciations of Kongur Mountain, eastern Pamir, China

Contact Info

Product

Resources

About