Chemical weathering in a glaciated carbonate catchment, Canadian High Arctic
- 出版日期：2002.
- 页数：118 p. :
- 第一责任说明：Karen Elizabeth Heppenstall.
- 分类号：a211.1 ; a374.1 ; a211.3
- ISBN：0612697169(ebk.) :
MARC全文
02h0025399 20110920112503.0 cr un||||||||| 110920s2002 xx ||||f|||d||||||||eng | AAIMQ69716 0612697169(ebk.) : CNY371.35 NGL NGL NGL a211.1 ; a374.1 ; a211.3 Heppenstall, Karen Elizabeth. Chemical weathering in a glaciated carbonate catchment, Canadian High Arctic [electronic resource] : implications for subglacial hydrology (Nunavut) / Karen Elizabeth Heppenstall. 2002. 118 p. : digital, PDF file. Source: Masters Abstracts International, Volume: 41-01, page: 0161. ; Adviser: Martin Sharp. Thesis (M.Sc.) -- University of Alberta (Canada), 2002. Hydrochemical analysis of waters draining polythermal John Evans Glacier, Ellesmere Island, during the summer of 2000 indicated significant chemical weathering of gypsum, calcite, dolomite and feldspars within the subglacial environment. Geochemical modeling using data collected in the field indicated that the balance of weathering rates was different in different hydrological settings. Calcite and gypsum dissolution were important m high discharge waters, and dolomite and feldspar dissolution were important in low discharge waters. A two-component drainage system was thus implied. At high discharge, the subglacial drainage system is at high pressure, and SSC is high. At low discharge, a drop in water pressure in subglacial channels allows stored water from the surrounding distributed system to enter the channels and exit the subglacial environment. This degree of subglacial channel development on an Arctic glacier is unusual, and is attributed to an unusually high rate of meltwater input to the subglacial environment. Chemical weathering. ; Carbonate rocks. ; Glacial erosion. Electronic books. aeBook. aCN bNGL http://proquest.calis.edu.cn/umi/detail_usmark.jsp?searchword=pub_number%3DAAIMQ69716&singlesearch=no&channelid=%CF%B8%C0%C0&record=1 NGL Bs931 rCNY371.35 ; h1 bs1107