Geochemistry of surface water in alpine catchments in central Colorado, USA: An example of sampling scale versus detail
The U.S. Geological Survey is conducting a study of surface-water quality in the Rocky Mountains of central Colorado. Sampled media include stream water, sediment, and biofilm coatings on streambed rocks. At selected sites, aquatic macroinvertebrates are being collected. This paper focuses on the stream-water chemistry. The dominant regional feature affecting water quality in central Colorado is the Colorado Mineral Belt (CMB), a northeast-trending zone hosting many polymetallic vein and replacement and porphyry Mo deposits that were mined from the mid-1800s to the present. The influence of the CMB is seen in lower surface-water pH (＜5), and higher concentrations of SO42- (＞ 100 mg/L) and siderophile and chalcophile metals such as Fe(＞ 1 mg/L), Cu (＞0.01 mg/L), Zn (＞0.1 mg/L), and Cd (＞0.001 mg/L). At local scales, effects of individual rock units on water chemistry are subtle but discernible, as shown primarily by concentrations of major lithophile elements or ratios between them.
R.B.Wanty P.L.Verplanck D.L.Fey S.E.Church C.A.San Juan V.A.Swigert
U.S.Geological Survey, Denver Federal Center, Denver, Colorado, USA
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
453-456
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）