Chemical and isotopic signatures of Na/HCO3/CO2‐rich geofluids,North Portugal

Geochemical and isotopic studies have been undertaken to assess the origin of CO₂‐rich waters issuing in the northern part of Portugal. These solutions are hot (76°C) to cold (17°C) Na–HCO₃ mineral waters. The δ²H and δ¹⁸O signatures of the mineral waters reflect the influence of altitude on meteoric recharge. The lack of an ¹⁸O‐shift indicates there has been no high temperature water–rock interaction at depth, corroborating the results of several chemical geothermometers (reservoir temperature of about 120°C). The low ¹⁴C activity (up to 9.9 pmC) measured in some of the cold CO₂‐rich mineral waters (total dissolved inorganic carbon) is incompatible with the presence of ³H (from 1.7 to 4.1 TU) in those waters, which indicates relatively short subsurface circulation times. The δ¹³C values of CO₂ gas and dissolved inorganic carbon range between ?6‰ and ?1‰ versus Vienna‐Peedee Belemnite, indicating that the total carbon in the recharge waters is being diluted by larger quantities of CO₂ (¹⁴C‐free) introduced from deep‐seated (upper mantle) sources, masking the ¹⁴C‐dating values. The differences in the ⁸⁷Sr/⁸⁶Sr ratios of the studied thermal and mineral waters seem to be caused by water–rock interaction with different granitic rocks. Chlorine isotope signatures (?0.4‰ < δ³⁷Cl < +0.4‰ versus standard mean ocean chloride) indicate that Cl in these waters could be derived from mixing of a small amount of igneous Cl from leaching of granitic rocks.     

The imprints of tourism on Puerto Vallarta, Jalisco, Mexico

Tourism is a major economic activity with significant social, political and environmental repercussions that affect people and places in virtually every corner of the contemporary world. This study focuses on tourism development in Puerto Vallarta (PV), Jalisco, Mexico. The region has been almost completely transformed by this industry in a relatively short period of time since the development of the first major hotel in 1948. The article begins by discussing the development of PV as a place, as a coastal tourist resort and also as a set of quite different cultural landscapes. Building on this we specifically identify, describe and discuss some of the major cultural imprints of tourism upon PV, including hotels, restaurants, the gay community, art galleries and Internet cafes as well as ecological imprints of     

Trans-Pacific Wood Chip Exports: the Rise of Chile

This study analyses the background to the rise of Chile as a major wood chip exporter, and assesses the environmental impact and relative economic importance of the Chilean wood chip industry. Chile is acting as a ‘surrogate’ for lost Australian hardwood chip exports to Japan. Compared to other countries, the wood chip industry in Chile has had a disproportionate impact on its remnant native forests and is essentially predicated on unsustainable forest management practices. Despite this, the relative economic importance of Chile's export wood chip industry is low when compared to value-added forest product export industries such as chemical pulp.