Precambrian shields

Allan C J, Heyes A, Roulet NT, St Louis VL, Rudd JWM. 2001. Spatial and temporal dynamics of mercury in Precambrian Shield upland runoff. Biogeochemistry 52 13 0. 

Wren, C.D. and H.R. Mac Crimmon. 1983. Mercury levels in the sunfish, Icpomis gibbosus, relative to pH and other environmental variables of precambrian shield lakes. Canad Jour. Fish. Aquat. Sci. 40 1737-1744. 

Wren, C.D., H.R. MacCrimmon, and B.R. Loescher. 1983. Examination of bioaccumulation and biomagnification of metals in a precambrian shield lake. Water Air Soil Pollut. 19 277-292. 

Ludden, J. Hynes, A. 2000. The Lithoprobe Abitibi-Grenville transect two billion years of crust formation and recycling in the Precambrian Shield of Canada. Canadian Journal of Earth Sciences, 37, 459-476. 

Although the uppermost part of the continental crust is relatively accessible for sampling, it is very heterogeneous and its overall arsenic concentration is difficult to estimate. Sims, Newsom and Gladney (1990, 302) provides an estimate of 5.1 1 mg kg-1 (1 SD Table 3.3). In comparison, Wedepohl (1995) used chemical data from rocks of the Canadian Precambrian shield to obtain a somewhat lower arsenic concentration of 2.0 mg kg-1 (Table 3.3). Granites and granodiorites, which are very common in the upper continental crust (Wedepohl, 1995), typically contain around 3 mg kg-1 of arsenic (Matschullat, 2000, 299 Table 3.4). 

Schiff, S. L., R. Aravena, S. E. Trumbore, M. J. Hinton, R. Elgood, and P. J. Dillon. 1997. Export of DOC from forested catchments on the Precambrian Shield of Central Ontario Clues from 13C and 14C. Biogeochemistry 36 43-65. 

Curtis, P. J., and D. W. Schindler. 1997. Hydrologic control of dissolved organic matter in low-order Precambrian Shield lakes. Biogeochemistry 36 125-138. 

Hinton, M. J., S. L. Schiff, and M. C. English. 1997. The significance of storms for the concentration and export of dissolved organic carbon from two Precambrian Shield catchments. Biogeochemistry 36 67—88. 

Schiff, S., R. Aravena, E. Mewhinney, R. Elgood, B. Warner, P. Dillon, and S. Trumbore. 1998. Precambrian Shield wetlands Hydrologic control of the sources and export of dissolved organic carbon. Climatic Change 40 167—188. 

Stockwell, C. H. Structural provinces, orogenies and time classification of rocks of the Canadian Precambrian Shield. Geol. Surv. Canada, Paper 61-17, 108 (1961). 

Nalewajko, C. and B. Paul. 1985. Effects of manipulations of aluminum concentrations and pH on phosphate uptake and photosynthesis of planktonic communities in two precambrian shield lakes. Can. J. FishAquat. Sci. 42 1946-1953. 

Shaw et al. (1967, 1976, 1986) and Bade and Fahrig (1971, 1973) independently derived estimates for the average composition of the Canadian Precambrian shield. Both studies created composites from representative samples taken over large areas that were weighted to reflect their surface outcrop area. The estimates of Shaw et al. are based on a significantly smaller number of samples than that of Bade and Fahrig s... 

Shaw D. M., Dostal J., and Keays R. R. (1976) Additional estimates of continental surface Precambrian shield composition in Canada. Geochim. Cosmochim. Acta 40, 73-83. 

Even Precambrian Shield regions exhibit remarkable variability in heat production. For example, the exposed part of the Proterozoic Trans-Hudson Orogen in Saskatchewan and Manitoba ( 500 km X 500 km) is a mosaic of different belts of different origins and compositions with different heat production values (Rolandone et al, 2002). Another example is provided by the Abitibi province of eastern Canada, which stands out as a low-heat-production region within the Archean Superior Province (Mareschal et al., 2000a). 

Hinton M. J., Schiff S. L., and English M. C. (1998) Sources and flowpaths of dissolved organic carbon in two forested watersheds of the Precambrian Shield. Biogeochemistry 41, 175-197. 

Bottomley D. J., Ross J. D., and Clarke W. B. (1984) Helium and neon isotope geochemistry of some groundwaters from the Canadian Precambrian Shield. Geochim. Cosmochim. Acta 48, 1973-1985. 

McNutt R. H., Frape S. K., and Fritz P. (1984) Strontium isotopic composition of some brines from the Precambrian shield of Canada. Isotope Geosci. 2, 205-215. 

Eirman J. B. (1994) Paleosols in laterite and silcrete profiles evidence from the southeast margin of the Australian Precambrian Shield. Earth Sci. Rev. 36, 149-179. 

Mierle G. (1990) Aqueous inputs of mercury to Precambrian shield lakes in Ontario. Environ. Toxicol. Chem. 9,843—851. 

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