Formation of chemogenic calcite in super-anoxic seawater — Framvaren, southern Norway |
| |
| Authors: | Leif G Anderson David Dyrssen Jens Skei |
| |
| Abstract: | Framvaren, a super-anoxic fjord in southern Norway, contains 7–8 mmoll−1 of sulphide and a total carbonate concentration of 18.5 mmol kg−1 in the bottom water. The chemistry of calcium has been studied, considering sources, biogenic and chemical processes and sedimentary sinks. Calcium associated with the bacteria biomass at the redox interface (18m depth) appears to be the primary source of dissolved calcium in the deep, anoxic water. Excess calcium and high total carbonate cause supersaturation of calcite, which is precipitated chemogenically. Calcite (and presumably some aragonite) is identified both in sediment trap material and the bottom sediments below the depth of supersaturation. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
