Environments of Tidal Marsh Deposition in Laguna San Rafael Area, Southern Chile

Abstract

Surveys of tidal marshes associated with environments of glacial retreat, braided river channel migration, and earthquake-induced subsidence revealed variations in marsh topography and morphology. Profiles show changes in marsh elevation caused by variations in substrate conditions and depth. Types of marsh surface pan, characterized by the absence of vegetation and the retention of water at low tide, are found in all three marsh environments. Classic channel pans are found, as well as other pan morphologies related to local surface conditions. Pans may be either primary or secondary marsh surface features, but are found in all three types of marsh.