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Why this new volume? During the past two decades, two major and exciting fields have emerged in the science of stable isotope geochemistry, both related to understanding tiny variations (down into the lower ppm range) in the minor isotopologue abundances. The first field is related to the distribution of “clumping” of heavy isotopes in molecules, such as CO2 or CH4; the second field is the use of small variations in all three oxygen isotopes. Both approaches allow researchers to resolve absolute temperatures, previously masked process pathways, and exchange between various reservoirs-- In this new volume of Reviews in Mineralogy and Geochemistry we concentrate on understanding the latter--understanding of variations among ratios of all three isotopes of oxygen, with primary emphasis on terrestrial systems. Triple oxygen isotope variations may be related to large, mass-independent fractionation effects such observed in the Earth atmosphere or may be small and related to minute variations due to purely mass-dependent processes. Recent advancements in analytical resolution now allow for the identification of processes and distinct reservoirs that were formerly hidden in the paradigm of a “single terrestrial fractionation line”. New, high-resolution measurements are accompanied by advances in theoretical calculations that dovetail with empirical calibrations and applications throughout this volume-- Here, we bring together the leading researchers and asked them to summarize the new discoveries in their field of expertise. The result is a volume with 14 chapters spanning a wide range of subjects: from ab-initio theoretical approaches to observation of triple oxygen isotope variations in the Earth litho-, hydro- and atmosphere. -- Triple Oxygen Isotope Geochemistry is a young and rapidly evolving field and some of the observations reported in this volume will undoubtedly be modified in the future as new discoveries and improved protocols are developed in the coming years. The triple oxygen isotope concepts presented in this volume, however, will hopefully prove valuable to new entrants in this field and lay a foundation for future growth.

Isotope geology. --- Oxygen --- Stable isotopes. --- Geochemistry. --- Géochimie isotopique. --- Isotopes stables. --- Géochimie. --- Isotopes.

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