Dune-dammed paleovalleys of the Nebraska Sand Hills: Intrinsic versus climatic controls on the accumulation of lake and marsh sediments

Chronology and geochemistry of late Holocene eolian deposits in the Brandon Sand Hills, Manitoba, Canada

“…Dunes in many parts of this region were long perceived to be relict landforms of full-glacial time (Wright, 1970;Sarnthein, 1978;Kutzbach and Wright, 1985), but it is now known that most dune "elds were last active in the Holocene. Stratigraphic studies combined with radiocarbon and luminescence dating methods demonstrate that eolian sands over a wide range of mid-continental North America have been active in the past 3000 years (David, 1971a, b;Ahlbrandt et al, 1983;Swinehart and Di!endal, 1990;Madole, 1994Madole, , 1995Holliday, 1995aHolliday, , b, 1997Forman et al, 1995;Loope et al, 1995;Arbogast, 1996;Muhs et al, 1996Muhs et al, , 1997aWolfe et al, 1995;Stokes and Swinehart, 1997). Furthermore, most of these studies have stratigraphic data indicating multiple periods of eolian activity in the late Holocene.…”

Geochemical and mineralogical evidence from eolian sediments for northwesterly mid-Holocene paleowinds, central Kansas, USA

“…Recent studies in the Nebraska Sand Hills suggest that dunes were active there during the mid-Holocene, as well as before and after this period (Loope et al, 1995;Stokes and Swinehart, 1997). In Colorado, there are few eolian sands dated directly to the mid-Holocene, but these localities combined with soil-geomorphic relations indicate the possibility of mid-Holocene dune activity (Madole, 1995;Forman et al, 1995;Muhs et al, 1996).…”

“…1), with large dune "elds and sand sheets present in Nebraska (Ahlbrandt et al, 1983;Swinehart, 1990;Loope et al, 1995), northeastern Colorado (Madole, 1995;Muhs et al, 1996), Texas (Holliday, 1995a), and Kansas (Arbogast, 1996a, b). One of the largest dune "elds (&4500 km) of the Great Plains is the Great Bend Sand Prairie in Kansas, located within the`great benda of the Arkansas River in the south-central part of the state (Fig.…”

Evaluating climatic and non-climatic influences on ion chemistry in natural and man-made lakes of Nebraska, USA

“…The majority (50-75%) of precipitation falls during summer months (MJJA), and the west to east annual precipitation gradient primarily reflects summer season precipitation; winter precipitation shows more limited spatial variation (Wilhite & Hubbard, 1998 (Bleed & Flowerday, 1998). The extent to which this large groundwater system influences individual Sand Hills lakes apparently depends on topography, groundwater recharge rates, and hydraulic conductivity (Winter, 1986;Loope et al, 1995).…”

“…The degree of hydrologic connectivity between lakes and groundwater is influenced by the hydrologic permeability of the surface deposits and has particularly strong impacts on ionic concentration and composition (Kratz et al, 1997). Several studies in western Nebraska have demonstrated the importance of these sorts of non-climatic influences on lake water chemistry (LaBaugh, 1986;Winter, 1986;Gosselin et al, 1994;Gosselin, 1997;Loope et al, 1995;Mason et al, 1997).…”