Download e-book for iPad: Glacial-Marine Sedimentation by John B. Anderson, Bruce F. Molnia(auth.)

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

ISBN-10: 0875907067

ISBN-13: 9780875907062

ISBN-10: 1118667670

ISBN-13: 9781118667675

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Published through the yank Geophysical Union as a part of the Short classes in Geology Series.

Glacial-marine sedimentation is among the extra advanced and least identified elements of sedimentation. a substantial quantity of literature, in spite of the fact that, does exist at the topic, particularly describing old glacial-marine deposits [e.g., Anderson, 1983; Andrews and fit, 1983; Molnia, 1983]. those old glacial-marine deposits are common, either in time and area, and are of substantial paleogeographic importance. strangely and regrettably, lots of those smooth characterizations of historical glacial-marine environments are according to a truly constrained knowing of the complexities of the modem glacial and glacial-marine environments.

Chapter 1 Definitions and Controlling elements of Glacial?Marine (pages 3–4): Bruce F. Molnia
Chapter 2 old 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 jap North Atlantic Ocean (pages 111–116):

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Additional info for Glacial-Marine Sedimentation

Sample text

CGM = compound glacial-marine sediment (>lo% ice-rafted debris), RGM = residual glacial-marine sediment, SiO = siliceous ooze, SiM = siliceous mud ( 4 0 % icerafted debris), dCGM = diatomaceous compound glacial-marine sediment; cZ = clayey silt, zC = silty clay, mS = muddy sand, and S = sand (all with less than 10% ice-rafted debris). Dots show sample locations. Modern Sediments of the Continental Shelf From a standpoint of sedimentology, the present Antarctic continental shelf is a unique depositional environment for the reasons that following.

Laoevr2re Bav The glacial setting of Lapeyrkre Bay is dominated by a single outlet glacier, Illiad Glacier at the head of the bay (Fig. 111-42). There are no beaches or meltwater streams. The sidewalls of the bay are covered by headland glaciers and ice aprons. Supraglacial debris, including eolian material, is absent, except for occasional avalanche and rock fall deposits. Surface waters within the bay are virtually sediment-free, even near glacier termini. The bay floor is characterized by two deep basins (> 600 m) which are partially separated by an intervening high (Fig.

Ice Shelf Settings Since 1980, we have conducted detailed marine geological surveys in three very different ice shelf settings. These include: (1) large polar ice shelves with unconfined flow; 36 ANTARCTICA'S GLACIAL SETTING Fig. III-32. Seismic (sparker) profile showing typical rugged topography and hyperbolic reflector pattern for areas where basal tills indicate that grounded ice sheets once covered the sheIf. Fig. 111-33. Seismic (sparker) profile from the Ross Sea continental shelf showing acoustically-laminated glacial-marine deposits resting on an irregular glacial-erosional surface.

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

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