Morphology and surface texture of quartz grains from ODP Site 105-645

The shapes and surface textures of sand-sized quartz grains from the sediments cored at Site 645 in southern Baffin Bay during ODP Leg 105 were studied to characterize the terrigenous materials and the settling processes involved in the deposition of these sediments. Here, we show a homogeneous sand...

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Bibliographic Details
Main Authors: Cremer, Michel, Legigan, Philippe
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1989
Subjects:
105-645
105-645B
105-645D
105-645E
Baffin Bay
COMPCORE
Composite Core
DRILL
Drilling/drill rig
Joides Resolution
Leg105
Ocean Drilling Program
ODP
Baffin Island
Baffin
East Greenland
Greenland
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.744805
https://doi.org/10.1594/PANGAEA.744805
Description
Summary:The shapes and surface textures of sand-sized quartz grains from the sediments cored at Site 645 in southern Baffin Bay during ODP Leg 105 were studied to characterize the terrigenous materials and the settling processes involved in the deposition of these sediments. Here, we show a homogeneous sand fraction that results from mixing grains from various provenances. The characteristics inherited from terrestrial processes (varying degrees of wear; fluviatile, aeolian, and diagenetic features) dominate the characteristics that result from evolution in a high-energy marine environment. Thus, the influence of the last stage of sedimentation in a deep-marine environment was difficult to distinguish. However, fluctuations in the relative proportions of particular features reveal that the terrigenous material derived from sedimentary formations of Baffin Island and East Greenland or from direct abrasion of the crystalline shield, which changed through time as the dominant settling processes evolved. In particular, this study confirms the onset of major ice rafting as old as late Miocene.

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