Arid
DOI10.1016/j.geomorph.2013.10.018
Trends in grain size and BET surface area in cold-arid versus warm-semiarid fluvial systems
Marra, Kristen R.1; Soreghan, Gerilyn S.1; Madden, Megan E. Elwood1; Keiser, Leslie J.1; Hall, Brenda L.2
通讯作者Marra, Kristen R.
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2014
卷号206页码:483-491
英文摘要

Sediment grain size and surface area impose critical controls on the rates of chemical weathering, even in cold-based (i.e., polar) glacial systems, where extensive chemical weathering traditionally has been considered minimal owing to low temperatures. Production of fine-grained material increases the surface area of sediments, priming mineral surfaces for chemical weathering. Comparison among grain size and reactive surface area of sediments along granitoid-sourced fluvial transects between a cold-arid, glacial (Wright Valley, Antarctica) and a warm-semiarid, nonglacial (Wichita Mountains, Oklahoma) environment indicates opposing trends downstream within the silt and clay (<63 mu m) fraction. In the polar glacial transect, the silt and clay fraction coarsens and exhibits a corresponding decrease in mineral surface area with fluvial transport. This is inferred to reflect rapid dissolution of fine-grained eolian material trapped on a glacier surface and released during summer melting. Fluvial sediments from the warm, nonglacial system exhibit the opposite trend, wherein a downstream decrease in grain size and increase in surface area suggest incongruent chemical weathering resulting in clay-sized secondary weathering phases. The observed trends highlight the important roles of reactive surface area and solute chemistry, which are closely linked to climate, in determining chemical weathering rates. Such trends are potentially discernible in the sediment record, providing a means to refine climatic inferences from proximal fluvial strata and further constrain the influence of chemical weathering on modern and on ancient global carbon cycles. Published by Elsevier B.V.


英文关键词Eolian Clark Glacier Polar desert Chemical weathering Clays Antarctica
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000332054400038
WOS关键词MCMURDO DRY VALLEYS ; SOUTHERN VICTORIA LAND ; TAYLOR VALLEY ; MELTWATER STREAM ; ANTARCTICA ; GLACIERS ; CHEMISTRY ; CLIMATE ; RATES ; SEDIMENT
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/182281
作者单位1.Univ Oklahoma, Sch Geol & Geophys, Norman, OK 73072 USA;
2.Univ Maine, Climate Change Inst, Orono, ME 04469 USA
推荐引用方式
GB/T 7714
Marra, Kristen R.,Soreghan, Gerilyn S.,Madden, Megan E. Elwood,et al. Trends in grain size and BET surface area in cold-arid versus warm-semiarid fluvial systems[J]. United States Geological Survey,2014,206:483-491.
APA Marra, Kristen R.,Soreghan, Gerilyn S.,Madden, Megan E. Elwood,Keiser, Leslie J.,&Hall, Brenda L..(2014).Trends in grain size and BET surface area in cold-arid versus warm-semiarid fluvial systems.GEOMORPHOLOGY,206,483-491.
MLA Marra, Kristen R.,et al."Trends in grain size and BET surface area in cold-arid versus warm-semiarid fluvial systems".GEOMORPHOLOGY 206(2014):483-491.
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