This book is a collected series of papers on the sedimentary geology of carbonate sediments deposited on shelves and offshore banks in cool to cold oceans. Contributions come mainly from a workshop organized by Jonathan Clarke held in Geelong, Victoria from January 14 to 19, 1995. Most earth scientists have traditionally viewed carbonate sediments as warm-water deposits and interpreted them as such in most of the geological record. Yet large areas of the modern seafloor are covered with neritic carbonate sediments formed in seawater that is colder than 20ºC. Such environments are not easily studied. Thus, our knowledge of cool-water carbonates has lagged far behind our understanding of their warm-water counterparts. This situation has changed somewhat as more and more investigators have braved the chill waters and rough seas. This book brings together a group of studies that illustrate the present status of our understanding and current research in a field that is in mid-life.
Permian Warm- to Very Cold-Water Carbonates and Cherts in Northwest Pangea
Published:January 01, 1997
A vast area of northwest Pangea, extending from the Sverdrup Basin (Canadian Arctic) to the Barents Sea (Norwegian and Russian Arctic) was affected by a significant climatic cooling in Permian time. Warm tropical-like conditions prevailed during the Asselian and Sakmarian interval, cool to cold temperate-like conditions occurred during the Artinskian to Kazanian interval, and very cold, polar-like conditions were established during latest Permian time (undetermined Kazanian-Tatarian).
This climatic deterioration led to a significant shift in the composition of biogenic sedjments. Asselian and Sakmarian shallow-water carbonates comprise abundant aragonite-secreted skeletal and non-skeletal elements (ooid, cement) dominated by abundant green algae...