Publisher Summary This chapter discusses hot-spring sediments in Yellowstone national park. This chapter outlines available information of sediment types and their distributions, and provides a sketch of the hot-spring facies (to facilitate its recognition in the geological record). The data present in the chapter provides an intensive study of hot-spring sediments in Yellowstone or in one of the other major hot-spring areas. The chapter also describes the geological settings of Yellowstone. The rocks produced are largely rhyolites and rhyolitic welded tuffs, with some basalts; they form the “Yellowstone rhyolite plateau”. The former areas of alkaline hot-spring activity are expected to show the following characteristics: (1) presence of volcanic rocks; (2) extensive hydrothermal alteration of host rocks; (3) presence of geyserite (its distribution around vents may be recognizable in wellexposed sequences); (4) presence of other siliceous sediment types, particularly stromatolites and diatomite; and (5) limited areal distribution.
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