Western USA

Out of 30 000 analyses of groundwater in the United States, about 10% had arsenic concentrations A10 pg E l (Welch et al., 2000) and 5% had concentrations of 20pgL 1 (Welch et al., 1999). Concentrations tend to be higher in the west (including the Interior Plains, Intermontane Plateau, Rocky Mountains, and Pacific Mountains physiographic provinces) than in the east, although recent studies have identified hotspots of contamination in several Midwestern and northeastern states (e.g. (Welch et al., 2000 Peters et al., 1999 Kelly et al., 2005), Appendix D). 

Arsenic in groundwater of the western Interior Plains and Intermontane Plateaus is generally thought to be liberated from iron (oxy)(hydr)oxides in aquifer sediments (Welch et al., 2000). However, in contrast to other regions where arsenic appears to be mobilized primarily by reduction of iron (oxy)(hydr)oxides (e.g. south and east Asia), elevated arsenic occurs in both anoxic and oxic groundwaters in the western United 

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It might be of interest to include here a list of powdery explosives, developed under the name of Standard Dynamites between WWI and WWlI at rhe laboratory of Apache Powder Company, Benson, Arizona, leading manufacturers of explosives for die Western USA. This was obtained from the late Dr I.A. Grageroff, former employee of... 

The resinite macerals are in some ways the most varied group. They are derived from both the wound resins (terpenes) of plants and various other plant fats and waxes making up the lipid resins. The terpene-derived resinites are the most abundant type and they are found in most North American coals as ovoid masses. However, 1n some coals, especially in the western USA the resinite occurs mainly as a secondary form showing... 

Cerling, T. E., Craig, H. (1994) Cosmogenic 3He production rates from 39°N to 46°N latitude, western USA and France. Geochim. Cosmochim. Acta, 58, 249-55. 

As with pfa low in CaO, fine, spherical particles consisting largely of glass predominate, but the glasses are higher in CaO and the assemblages of crystalline phases are different. In a study of 26 ashes from the western USA. McCarthy el al. (M84) found that quartz, lime, periclase, anhydrite and a ferrite spinel were ubiquitous or nearly so. Other crystalline phases present in some cases or in minor amounts included C3A, merwinite, alkali sulphates, melilites, mullite, sodalite and possibly others. Due to the presence of... 

Figure 3 Location of the main ophiolitic belts and ophiolite complexes mentioned in the text (after Coleman, 1977 Ishiwatari, 1994 Moores et al., 2000). (1) Circum-Pacific Phanerozoic Multiple Ophiolite Belt (450-0 Ma) KM— Klamath Mountains (Trinity and Josephine, western USA) NC—New Caledonia PNG—Papua-New Guinea IB— Indonesian Back-Arc ophiolites. (2) Himalaya-Alps-Caribbean Mesozoic Belt (150-80 Ma) YZ—ophiolites of the Yarlung Zangbo Suture Zone, China OM—Oman (=Semail ophiolite). Sultanate of Oman and Unites Arab Emirates TR—Troodos, Cyprus VO—Vourinos and Pindos, Greece WA—Western Alps (Internal Ligurides and Lanzo) CU—Cuba ophiolites. (3) Appalachian-Caledonian Belt (450 Ma) BOI—Bay of Islands, Newfoundland.

The best characterized noncratonic, spinel peridotite xenoliths for PGEs are those from southeastern Australia (Handler and Bennett, 1999), the Massif Central, France (Lorand and Alard, 2001), Western USA (Morgan et al., 1981 Lee, 2002) and Vitim, Siberia (Pearson et al,... 

Dodson A., DePaolo D. J., and Kennedy B. M. (1998) Helium isotopes in lithospheric mantle evidence from Tertiary basalts of the western USA. Geochim. Cosmochim. Acta 62, 3775-3787. 

Because of the generally high LREE contents of all the western USA alkali basalts, their neodymium-isotopic compositions are likely to represent those of their mantle source regions. The high-SKfd (low-LIL/HFSE) and low-8Nd (high-LILE/HFSE) alkali basalts are typically. 

Tuttle M. L. and Goldhaber M. B. (1993) Sedimentary sulfur geochemistry of the Paleogene Green River Formation, Western USA implications for interpreting depositional and diagenetic processes in saline alkaline lakes. Geochim. Cosmochim. Acta 57(13), 3023-3039. 

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