In this monograph the authors present an overview of the state-of-the-art and use examples or case histories to illustrate the combined role of rock decay and rivers on continental denudation. The Earth's surface dynamics would not be conceivable without the fundamental component of rock weathering and the subsequent transport of solid debris and dissolved components to the coastal ocean through riverine drainage pathways. In other words, continental wear away is highly dependent on the mechanisms that control mineral decay. Moreover, besides the significant role played by rivers in shaping the Earth's outer skin, there is the important function that rivers perform in all geochemical cycles, mediating between the lithosphere, the hydrosphere, the biosphere and the hydrosphere. Drainage basins and the weathering of rocks that occur therein may be significant sources (or sinks) of carbon dioxide and, hence, play a significant role in affecting the Earth's climate.

Written by a world known expert in hydrological geochemistry Describes various aspects of the non organic and organic load of rivers to the oceans Details the effect of climatic change to the river load

Autorentext

P. J. Depetris is a senior researcher at Argentina's National Council for Scientific and Technical Research (CONICET) and, concurrently, Emeritus Professor at Córdoba National University (Argentina). He has focused on surface geochemistry and his recent work has included the study of Patagonia's rivers as sources of material transported to the southern coastal ocean, and other hydrological and climatic aspects in southern South America. A.I. Pasquini is Assistant Professor at Córdoba National University and a researcher in Argentina's CONICET. Her recent work has been devoted to the study of natural and anthropogenic riverine geochemical processes; hydrological dynamics have also been thoroughly explored, in particular the impact of ENSO on South American freshwater systems. K.L. Lecomte is also an Assistant Professor at Córdoba National University and a researcher in Argentina's CONICET. Her most recent work has been oriented toward the study of freshwater geochemical processes, mostly by means of modeling techniques applied to weathering and, particularly, to extremely acid rivers impacted by former mining activities. The authors belong to the scientific staff of the Centro de Investigaciones en Ciencias de la Tierra (CICTERRA) or, in English, Research Center for the Earth Sciences, one of Argentina's leading research centers in the geosciences, jointly managed by CONICET and the Universidad Nacional de Córdoba, in Córdoba, Argentina (http://www.cicterra-conicet.gov.ar/).

Inhalt

Introduction.- The Commencement of Continental Denudation: Mechanical Weathering.- The Biological Path to Rock Breakdown.- Chemical Weathering Processes at Earth´s Surface.- Weathering: Intensity and Rates.- The Wearing Away of Continents.- Concluding Comments.