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Journal Article
Published: 17 May 2016
Quarterly Journal of Engineering Geology and Hydrogeology (2016) 49 (2): 147-153.
...-grained drift and often covered by terrace gravels, making them difficult to identify at the surface. Their origin remains uncertain but most probably formed towards the end of glacial epochs by meltwater scouring, perhaps of collapsed pingos. Usually associated with tributaries to the Thames, DFHs...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2016
GSA Bulletin (2016) 128 (5-6): 719-738.
... units within a 34-m-thick sequence: the Friis I, Friis II, and Cavendish drifts. Tills in Friis I drift were deposited from alpine glaciers flowing to the SW. An extensive tephra bed in the drift is 19.76 ± 0.11 Ma in age based on 40Ar/39Ar dating. Tills in Friis II drift were deposited from alpine...
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Journal Article
Published: 01 February 2016
Geochemistry: Exploration, Environment, Analysis (2016) 16 (1): 27-47.
.... These sediments hinder the use of many of the above-mentioned exploration techniques, and for this reason, surficial exploration methods (drift prospecting, till geochemistry, indicator minerals) have been developed and used. Many lessons learned from applying till geochemical methods to orogenic gold deposits...
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Journal Article
Published: 01 November 2015
Geochemistry: Exploration, Environment, Analysis (2015) 15 (4): 333-349.
... dispersal up to a maximum of 6 km down-ice. A 15–20 km till indicator mineral sample spacing is sufficient to detect a gahnite glacial dispersal train such as that from the Izok Lake VMS deposit. Izok Lake dispersal train gahnite indicator minerals till geochemistry drift prospecting volcanogenic...
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Journal Article
Published: 01 April 2015
Canadian Journal of Earth Sciences (2015) 52 (6): 386-404.
.... It is estimated that the north face has moved back by about 40–50 m during this interval. The eastern exposure has remained unchanged, although its condition has deteriorated slightly due to slumping. Drift thickness in the immediate vicinity of the Zorra quarry ranges between 20 and 30 m, with measured thickness...
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Journal Article
Published: 01 November 2013
Geochemistry: Exploration, Environment, Analysis (2013) 13 (4): 303-316.
... of the density markers ( Michaud & Averill 2009 ); and, (4) some markers are made of plastic and are unsuitable if samples are dried at high temperature ( Towie & Seet 1995 ). Indicator minerals quality assurance quality control heavy minerals drift prospecting 5 12 2011 5 9 2012 References...
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Journal Article
Journal: Geology
Published: 01 March 2012
Geology (2012) 40 (3): 255-258.
... to middle Eocene boundary. This finding is based on the identification of a large, elongate contourite sediment drift, the “Judd Falls Drift,” in the Faeroe-Shetland Basin, through detailed mapping of high-resolution two-dimensional and three-dimensional seismic data. This sediment drift covers an area...
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Journal Article
Journal: Geology
Published: 01 April 2011
Geology (2011) 39 (4): 343-346.
... interglacial boundary conditions tend to excite more pronounced abrupt millennial variability in the ocean overturning than the warmer interglacials of the late Pleistocene, including our present warm period. Ocean Drilling Program (ODP) Site 983 (60.4°N, 23.6°W, 1984 m) is on Gardar Drift, which...
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Journal Article
Journal: Geology
Published: 01 February 2011
Geology (2011) 39 (2): 107-110.
.... Low-resolution deep-water reconstructions indicate lower North Atlantic Deep Water (NADW) production during the Younger Dryas, though the Δ14C record requires some deep-water production. Herein, we reconstruct deep-water mass variations using a southern Gardar Drift sediment core with an expanded...
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Journal Article
Journal: Geology
Published: 01 May 2010
Geology (2010) 38 (5): 411-414.
... not have been sufficient to contribute significantly to meltwater pulse 1A, a rapid rise in sea level ∼14,200 yr ago. An alternative explanation of the age distribution would be that some of the older ages are correct, and that the younger samples have been exhumed from the drift during postglacial erosion...
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Series: GSA Special Papers
Published: 01 January 2009
DOI: 10.1130/2009.2460(03)
.... Army Corps of Engineers developed a plan for the groin field, and their recommendation was to sequentially build the groins up drift (eastward toward Shinnecock Inlet) using standard project design. However, in the late 1970s, local community pressure forced the U.S. Army Corps of Engineers, contrary...
Journal Article
Journal: GSA Bulletin
Published: 01 January 2009
GSA Bulletin (2009) 121 (1-2): 134-149.
... in the oceanographic regime east of New Zealand. This led to the formation of channels, sediment drifts, and sediment waves. At least since the Miocene, bottom current activity has been the dominating depositional process. The seismic data show an up to 2000-m-thick accumulation of well-stratified sediments within...
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Journal Article
Published: 06 June 2008
Canadian Journal of Earth Sciences (2008) 45 (5): 577-591.
... to be paleovalleys incised into the soft Cretaceous shale of the Fort St. John Group. Understanding the geometry, thickness, and stratigraphy of the drift has considerable safety and resource management implications as artesian aquifers and natural gas were encountered in the drift during oil and gas well drilling...
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Journal Article
Published: 01 November 2007
Proceedings of the Yorkshire Geological Society (2007) 56 (4): 235-243.
... the result of a single short-lived event. Gravel-dominated beds represent deposition of reworked rockfall debris and glacial drift by cohesionless debris flows, whereas finer-grain beds are probably the result of sheet-flows derived by washout of fines from debris-flow deposits. The stratigraphic evidence...
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Journal Article
Published: 01 November 2007
Proceedings of the Yorkshire Geological Society (2007) 56 (4): 245-251.
... assemblage rests upon till closely comparable with the Marly Drift, usually considered to be of Anglian age, and is overlain by Late Devensian Hunstanton Till. At Kirmington, in NE Lincolnshire, estuarine silts containing a thin peat bed with a limited temperate pollen spectrum separate tills assigned...
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Journal Article
Published: 01 August 2007
Geochemistry: Exploration, Environment, Analysis (2007) 7 (3): 195-205.
... . 1997; Kleman & Hättestrand 1999; McCabe et al . 1999; Sarala 2005 b , , ). The challenges that they represent to mineral exploration by drift prospecting have been examined, although they remain poorly known ( Peuraniemi 1982; Aario & Peuraniemi 1992; Aario et al . 1997; Sarala et al...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2007
GSA Bulletin (2007) 119 (5-6): 515-528.
... and surface waters in three watersheds spanning the Upper to Lower Peninsulas of Michigan consist of Ca2+-Mg2+-HCO3− solutions derived from the open-system dissolution of calcite and dolomite in soils developed on mixed mineralogy glacial drift. The thermodynamic stabilities of calcite and dolomite both...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2006
GSA Bulletin (2006) 118 (5-6): 606-619.
... wasting. Submarine channels on the upper slope continue into the abyssal plain as far north as ∼67°S. They are separated by sediment drifts and sediment waves resulting from the interaction between downslope turbidity current processes and along-slope bottom currents. Similar deep-sea sedimentary...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2399(14)
... of calcareous bedrock or glacial drift, and they and/or calcareous seeps appear to have been common in the late Pleistocene. Some late Pleistocene rich fens persisted through the Holocene ( Futyma and Miller, 2001 ), and organisms in them can be of special conservation concern. Scorpidium scorpioides ( Miller...
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Journal Article
Published: 01 August 2005
Geochemistry: Exploration, Environment, Analysis (2005) 5 (3): 233-245.
... visually, but some grains of Mg-ilmenite and spinel and all grains of eclogitic garnet as well as the diamond indicator minerals usually require electron microprobe analysis to confirm their identification and determine element concentrations for classification. indicator minerals drift prospecting...
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