Glaciolacustrine deposits
- Glaciolacustrine deposits
Sediments deposited into lakes that have come from glaciers are called glaciolacustrine deposits. These lakes include ice margin lakes or other types formed from glacial erosion or deposition. Sediments in the bedload and suspended load are carried into lakes and deposited. The bedload is deposited at the lake margin while the suspended load is deposited all over the lake.
Glaciolacustrine Bedload Deposits
Sediments carried in the bedload of a stream, mostly sands and gravels, are deposited in deltas that form at the edges of lakes. These deposits will only be found near the edges of the lake and not in the middle.
Glaciolacustrine Suspended Deposits
Sediments that are carried in the suspended load of a stream, commonly silts and clays, are transported into the lake in suspension or by currents along the lake floor. These are the principle deposits during the winter because of lack of melting of the glacier so the stream has a reduced discharge therefore carrying less coarse material. These sediments normally consist of fine-grained rhythmites that are laid down in layers known as varves or varvites. A varve represent an annual deposition of materials and in this case that being silt/clay. Sedimentation in deltas also occurs in rhythmic patterns as in the lake deposits, but they are thicker and contain coarse-grained materials instead of just silt and clay. As the varves get closer to the shoreline the clay layer will stay relatively the same thickness, but there will be an increase in thickness of the silt layer.
"'References
*Easterbrook, D. J. (1999). Surface Process and Landforms 2nd ed. Upper Saddle River NJ: Prentice Hall. ISBN 0-13-860958-6
Wikimedia Foundation.
2010.
Look at other dictionaries:
glacial landform — ▪ geology Introduction any product of flowing ice and meltwater. Such landforms are being produced today in glaciated areas, such as Greenland, Antarctica, and many of the world s higher mountain ranges. In addition, large expansions of present… … Universalium
Don River (Ontario) — Coordinates: 43°39′4″N 79°20′51″W / 43.65111°N 79.3475°W / 43.65111; 79.3475 … Wikipedia
Pottageville, Ontario — Infobox Settlement official name = Pottageville nickname = settlement type = Unincorporated community motto = imagesize = image caption = flag size = image seal size = image shield = shield size = city citylogo size = mapsize = map caption =… … Wikipedia
Clay Belt — This satellite photo of Lake Timiskaming shows a clear difference in landforms, with the muskeg of the Canadian Shield to the southwest and flatter drained and cleared area of the Lesser Clay Belt to the north. The white coloring is due to snow… … Wikipedia
gla|ci|o|la|cus|trine — «GLAY shee oh luh KUHS trihn, see », adjective. of or produced by glaciers and lakes: »glaciolacustrine deposits. ╂[< Latin glaciēs ice + English lacustrine] … Useful english dictionary
Origin of the Oak Ridges Moraine — For general context, see Oak Ridges Moraine. The Oak Ridges Moraine is a geological landform that runs east west across south central Ontario, Canada. It developed about 12,000 years ago, during the Wisconsin glaciation in North America. A… … Wikipedia
Oak Ridges Moraine — The Oak Ridges Moraine is an ecologically important geological landform in the Mixedwood Plains of south central Ontario, Canada. The moraine covers a geographic area of 1,900 square kilometres (730 sq mi) between Caledon and Rice Lake … Wikipedia
Geography of Hamilton, Ontario — Hamilton is located on the western end of the Niagara Peninsula and wraps around the westernmost part of Lake Ontario, most of the city including the downtown section are on the south shore. Situated in the geographic centre of the Golden… … Wikipedia
Proglacial lakes of Minnesota — [ Minnesota, with proglacial lakes added in dark blue.] The proglacial lakes of Minnesota were lakes created in what is now the U.S. state of Minnesota in central North America in the waning years of the last glacial period. As the Laurentide ice … Wikipedia
Overdeepening — Sognefjord in Norway, the second longest fjord in the world, shows characteristic overdeepening. Overdeepening is a characteristic of basins and valleys eroded by glaciers. An overdeepened valley profile is often eroded to depths which are… … Wikipedia