Arid
DOI10.1016/j.chemgeo.2015.12.006
Carbonate and elemental accumulation rates in arid soils of mid-to-late Pleistocene outwash terraces, southeastern Wind River Range, Wyoming, USA
Dahms, Dennis1; Egli, Markus2
通讯作者Egli, Markus
来源期刊CHEMICAL GEOLOGY
ISSN0009-2541
EISSN1878-5999
出版年2016
卷号446页码:147-162
英文摘要

An important result of the past few decades of soil-geomorphic research is the awareness of the major role of dust and related carbonate precipitates in arid soils. The temporal evolution of soils developed on outwash terraces is still a matter of debate particularly regarding the type of evolution: progressive evolution and constant rates vs complex and/or interval-accumulation rates (progressive or regressive evolution possible). Soils on a chronosequence of outwash terraces just outside and downstream of canyon mouths of the Wind River Range (USA) were analysed for carbonate accumulation, organic carbon and poorly-crystalline pedogenetic oxyhydroxides stocks and pathways of chemical weathering. The soils and their carbonate stocks in the fine earth fraction (<2 mm) can be used as a relative dating tool and appear to correlate with regional glacial, chronostratigraphy [Pinedale (c. 20 ky), Bull Lake (with two different units around 160 and 260 ky) and Sacagawea Ridge (c. 660 ky)]. Carbonate stocks of soils on these terraces increase with increasing soil age, but at generally decreasing rates. A quasi-steady state situation, however, was not reached before 1 My. The time-split approach showed that CaCO3 accumulation rates were the highest during marine isotope (MIS) cold stages (2.13 g CaCO3/m(2)/y), presumably due to a sparse vegetation cover during MIS2 (Pinedale) and 8 (lower Bull lake). Compared to organic carbon (c. 8-10 kg C-org/m(2)), the inorganic carbon stocks of the fine earth fraction were much higher (c. 60 kg C-inorg/m(2)). Although the dominant pedogenic process here appears to be carbonate accumulation, chemical weathering and elemental leaching also are significant. Weathering data were obtained using immobile elements and rare earth elements (REE) as tracers. Chemical weathering and related leaching were particularly notable for Na originating from plagioclase. In addition, pedogenetic Al and Mn oxyhydroxides accumulate (220 and 32 g/m(2), respectively, after 660 ky). These format relatively low rates, however, when compared to moister and cooler conditions at higher altitudes in the Wind River Range. Due to the dry climate under which the terrace soils formed (annual precipitation 32 cm/yr(-1)), weakly crystalline and amorphous Feoxyhydroxide is rapidly transformed into crystalline forms (hematite) over time. Consequently, the stocks of weakly crystalline and amorphous Fe-oxyhydroxide was significantly lower in the similar to 660 ky soils (50 g/m(2)) than in the Holocene soils (1000 g/m(2)).


The development of soils on Quaternary outwash teiraces in this region is controlled through the rates of aeolian influx over time as modified by glacial/interglacial climate variations rather than by moisture availability. Consequently, carbonate accumulation rates in these soils are ’influx limited’ rather than ’moisture limited’. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Chronosequence Arid soils Carbonate accumulation Weathering Wind River Range
类型Article
语种英语
国家USA ; Switzerland
收录类别SCI-E
WOS记录号WOS:000389396200012
WOS关键词COLORADO-FRONT-RANGE ; GREENLAND ICE CORE ; GLACIAL DEPOSITS ; ROCKY-MOUNTAINS ; ALPINE SOILS ; WHISKEY BASIN ; EOLIAN DUST ; BULL LAKE ; QUATERNARY ; CLIMATE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192029
作者单位1.Univ Northern Iowa, Dept Geog, Cedar Falls, IA USA;
2.Univ Zurich, Dept Geog, CH-8057 Zurich, Switzerland
推荐引用方式
GB/T 7714
Dahms, Dennis,Egli, Markus. Carbonate and elemental accumulation rates in arid soils of mid-to-late Pleistocene outwash terraces, southeastern Wind River Range, Wyoming, USA[J],2016,446:147-162.
APA Dahms, Dennis,&Egli, Markus.(2016).Carbonate and elemental accumulation rates in arid soils of mid-to-late Pleistocene outwash terraces, southeastern Wind River Range, Wyoming, USA.CHEMICAL GEOLOGY,446,147-162.
MLA Dahms, Dennis,et al."Carbonate and elemental accumulation rates in arid soils of mid-to-late Pleistocene outwash terraces, southeastern Wind River Range, Wyoming, USA".CHEMICAL GEOLOGY 446(2016):147-162.
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