Glacial-Marine Sedimentation by John B. Anderson, Bruce F. Molnia(auth.)

By John B. Anderson, Bruce F. Molnia(auth.)

About The Product

Published by means of the yankee Geophysical Union as a part of the Short classes in Geology Series.

Glacial-marine sedimentation is without doubt one of the extra complicated and least identified elements of sedimentation. a substantial quantity of literature, in spite of the fact that, does exist at the topic, particularly describing historic glacial-marine deposits [e.g., Anderson, 1983; Andrews and fit, 1983; Molnia, 1983]. those historic glacial-marine deposits are common, either in time and area, and are of substantial paleogeographic value. strangely and regrettably, lots of those sleek characterizations of historical glacial-marine environments are in keeping with a truly limited realizing of the complexities of the modem glacial and glacial-marine environments.

Content:
Chapter 1 Definitions and Controlling elements of Glacial?Marine (pages 3–4): Bruce F. Molnia
Chapter 2 historical Glacial?Marine Deposits (pages 5–9): John B. Anderson
Chapter three Antarctica's Glacial environment (pages 11–57): John B. Anderson
Chapter four Subarctic (Temperate) Glacial?Marine Sedimentation the Northeast Gulf of Alaska (pages 59–106):
Chapter five comparability of Glacial?Marine Depositional Environments of Polar Antarctica and the Temperate Gulf of Alaska (pages 107–109): Bruce F. Molnia
Chapter 6 Descriptions of Glacial?Marine Sedimentation within the japanese North Atlantic Ocean (pages 111–116):

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Additional info for Glacial-Marine Sedimentation

Sample text

Dots show sample locations. Fig. 111-24. A 12 kHz profile across the George V continental shelf showing laminated siliceous sediments which thicken in an onshore direction (A is landward and C is seaward). Pleistocene basal tills. , 19851. Elsewhere, the volume of silts and clays on the shelf and slope is so great, relative to basal tills, that other sources must exist. Anderson et al. [I9841 have suggested that these fine-grained temgenous sediments may be coming from subglacial meltwater streams emanating from beneath the ice sheets and ice shelves.

Seismic (sparker) profile from the northern flank of Drygalski Trough (Fig. 111-5) showing large, submarine morainal ridge [from Wong and Christoffel. 19811. (2) small polar ice shelves with confined flow; and (3) large subpolar ice shelves with unconfined flow. During these surveys we have acquired both high resolution seismic profiles and piston cores, and these data provide the basis for contrasting facies relationships in these different ice shelf settings. Large polar ice shelves with unconfinedflow (the Ross Ice Shelf).

Dunbar et al. [I9851 found that silica concentrations in bottom sediments of the Ross Sea shelf increase in an onshore direction and that there is a corresponding decrease in ice-rafted sand and organic carbon. This pattern is attributed to sediment reworking on the outer shelf, which results in fine-grained sediments, including biogenic material, being winnowed and transported into the inner shelf basin. While marine currents concentrate biogenic silica in shelf basins, organic carbon is decomposed through current reworking.

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