Circulation and bathymetry of Lapeyrère Bay, Anvers Island
Table 2. Marine geologic sample stations, R/V Polar Duke cruise 90-7 (continued) Location
Hughes Bay (revisited)
Station Latitude (S) Longitude (W) Depth Sample type 62 63 64 65 66 67 68 69 70 71
67° 14.28' 67° 13.02' 67° 13.01' 67° 11.97' 67° 11.10' 67° 19.86' 67° 19.87' 67° 17.29' 67° 15.00' 67° 12.46'
66° 48.28' 66° 46.53' 66° 46.59' 66° 45.17' 66° 39.23' 66° 28.21' 66° 28.16' 66° 30.12' 66° 32.26' 66° 53.21'
72 73 74 75
67° 12.55' 67° 09.99' 67° 08.39' 67° 08.40'
66° 53.29' 66° 50.00' 66° 47.97' 66° 47.81'
210 195 200 220 620 590 590 540 501 660 655 803 640 644
76
64° 16.09'
61° 03.51'
515
Gore Length (in centimeters)
SMG SMG GC SMG SMG SMG GC SMG SMG Pc,Tc
822,86
KC PC,TC Pc,Tc KG
150 304,86 27,67 275
PC,TC
664,17
67
25
a SMG denotes Smith McIntyre grab; PG denotes piston core; GC denotes gravity core; TG denotes trigger core (for piston core); and KG denotes Kasten core.
like to express our sincere appreciation to the Captain and crew of the WV Polar Duke for their enthusiastic support of our research objectives.
References Domack, E.W. and Williams, C.R. 1990. Fine-structure and suspended sediment transport in three Antarctic fjords. C.R. Bentley (Ed.), Contributions to Antarctic Research Series. (Antarctic Research Series, Vol. 50.) Washington, D.C.: American Geophysical Union. Frederick, B.C., E.W. Domack, and C.E. McClennen. 1991. Magnetic
Circulation and bathymetry of Lapeyrère Bay, Anvers Island JULIE E. DIXON and EUGENE W DOMACK
Geology Department Hamilton College Clinton, New York 13323
This study was initiated as part of a regional investigation on the circulation and depositional environment of fjords and bays along the western side of the Antarctic Peninsula (Domack 1988; Domack, Burley, and Williams 1989; Domack 1990). Studies within Lapeyrère Bay were conducted to define the relative role of meltwater input, estuarine circulation, and bathymetry upon sedimentation. Previous studies by Griffith and Anderson (1989) suggested that input of terrigenous sediment into Lapeyrere Bay was relatively high because of the arenaceous char108
susceptibility measurements in antarctic glacial-marine sediment from in front of the Muller Ice Shelf, Lallemand Fjord. Antarctic Journal of the U.S., 26(5). Ishman, S.E. 1989. Modern benthic foraminiferal distribution from the Bellingshausen/Pacific sector of the Antarctic Peninsula. Antarctic Journal of the U.S., 24(5), 121-123. Ishman, S.E. 1990. Quantitative analysis of antarctic benthic foraminifera: Application to paleoenvironmental interpretations. (Unpublished dissertation.) Columbus: Ohio State University. McClennen, CE., and E.W. Domack. 1991. Depositional patterns examined through 3.5- and 12-kilohertz records from fjords, passages, straits, and inner shelf west of the Antarctic Peninsula. Antarctic Journal of the U.S., 26(5).
acter of bottom sediments. Subsequently, this was confirmed (Domack et al. 1989) by the quantitative analyses of sediment texture and composition. The question that needed to be answered was whether the sediment characteristics reflect glacial meltwater and terrigenous input (climatic control) or whether iceberg rafting and a combination of fjord geometry and bathymetry could explain the sediment characteristics. We visited Lapeyrere Bay twice during the 1987-1988 austral summer aboard the WV Polar Duke. Our sampling was conducted once in late December and once in late January to observe the processes of meltwater input during the peak of the summer melt season, as it exists in this subpolar to polar climatic setting. Oceanographic data, continuous bottom profiles, and water samples were collected within the bay as illustrated in figure 1. Information on sampling instrumentation, station location, and data processing can be found in Domack (1988) and Domack and Williams (1990). The bathymetric compilation illustrates that Lapeyrere Bay is marked by a single, deep submarine valley which extends from the head, the front of Illion Glacier, to the mouth, Dallman Bay. ANTARCTIC JOURNAL
Mir,
63 0 20'
Dallman Bay
0 1 2 3 4 5 kilometers
Anvers Island
6
04
5.
III,
v k
23
0 24
3
Q0,
Figure 1. Bathymetric chart of Lapeyrere Bay, with contour intervals of 100 meters. Cast station locations for December 1987 (circles) and January 1988 (dots) are shown. Zodiac casts were taken manually from a zodiac raft.
A single low relief sill (
Hughes Bay (revisited)
Station Latitude (S) Longitude (W) Depth Sample type 62 63 64 65 66 67 68 69 70 71
67° 14.28' 67° 13.02' 67° 13.01' 67° 11.97' 67° 11.10' 67° 19.86' 67° 19.87' 67° 17.29' 67° 15.00' 67° 12.46'
66° 48.28' 66° 46.53' 66° 46.59' 66° 45.17' 66° 39.23' 66° 28.21' 66° 28.16' 66° 30.12' 66° 32.26' 66° 53.21'
72 73 74 75
67° 12.55' 67° 09.99' 67° 08.39' 67° 08.40'
66° 53.29' 66° 50.00' 66° 47.97' 66° 47.81'
210 195 200 220 620 590 590 540 501 660 655 803 640 644
76
64° 16.09'
61° 03.51'
515
Gore Length (in centimeters)
SMG SMG GC SMG SMG SMG GC SMG SMG Pc,Tc
822,86
KC PC,TC Pc,Tc KG
150 304,86 27,67 275
PC,TC
664,17
67
25
a SMG denotes Smith McIntyre grab; PG denotes piston core; GC denotes gravity core; TG denotes trigger core (for piston core); and KG denotes Kasten core.
like to express our sincere appreciation to the Captain and crew of the WV Polar Duke for their enthusiastic support of our research objectives.
References Domack, E.W. and Williams, C.R. 1990. Fine-structure and suspended sediment transport in three Antarctic fjords. C.R. Bentley (Ed.), Contributions to Antarctic Research Series. (Antarctic Research Series, Vol. 50.) Washington, D.C.: American Geophysical Union. Frederick, B.C., E.W. Domack, and C.E. McClennen. 1991. Magnetic
Circulation and bathymetry of Lapeyrère Bay, Anvers Island JULIE E. DIXON and EUGENE W DOMACK
Geology Department Hamilton College Clinton, New York 13323
This study was initiated as part of a regional investigation on the circulation and depositional environment of fjords and bays along the western side of the Antarctic Peninsula (Domack 1988; Domack, Burley, and Williams 1989; Domack 1990). Studies within Lapeyrère Bay were conducted to define the relative role of meltwater input, estuarine circulation, and bathymetry upon sedimentation. Previous studies by Griffith and Anderson (1989) suggested that input of terrigenous sediment into Lapeyrere Bay was relatively high because of the arenaceous char108
susceptibility measurements in antarctic glacial-marine sediment from in front of the Muller Ice Shelf, Lallemand Fjord. Antarctic Journal of the U.S., 26(5). Ishman, S.E. 1989. Modern benthic foraminiferal distribution from the Bellingshausen/Pacific sector of the Antarctic Peninsula. Antarctic Journal of the U.S., 24(5), 121-123. Ishman, S.E. 1990. Quantitative analysis of antarctic benthic foraminifera: Application to paleoenvironmental interpretations. (Unpublished dissertation.) Columbus: Ohio State University. McClennen, CE., and E.W. Domack. 1991. Depositional patterns examined through 3.5- and 12-kilohertz records from fjords, passages, straits, and inner shelf west of the Antarctic Peninsula. Antarctic Journal of the U.S., 26(5).
acter of bottom sediments. Subsequently, this was confirmed (Domack et al. 1989) by the quantitative analyses of sediment texture and composition. The question that needed to be answered was whether the sediment characteristics reflect glacial meltwater and terrigenous input (climatic control) or whether iceberg rafting and a combination of fjord geometry and bathymetry could explain the sediment characteristics. We visited Lapeyrere Bay twice during the 1987-1988 austral summer aboard the WV Polar Duke. Our sampling was conducted once in late December and once in late January to observe the processes of meltwater input during the peak of the summer melt season, as it exists in this subpolar to polar climatic setting. Oceanographic data, continuous bottom profiles, and water samples were collected within the bay as illustrated in figure 1. Information on sampling instrumentation, station location, and data processing can be found in Domack (1988) and Domack and Williams (1990). The bathymetric compilation illustrates that Lapeyrere Bay is marked by a single, deep submarine valley which extends from the head, the front of Illion Glacier, to the mouth, Dallman Bay. ANTARCTIC JOURNAL
Mir,
63 0 20'
Dallman Bay
0 1 2 3 4 5 kilometers
Anvers Island
6
04
5.
III,
v k
23
0 24
3
Q0,
Figure 1. Bathymetric chart of Lapeyrere Bay, with contour intervals of 100 meters. Cast station locations for December 1987 (circles) and January 1988 (dots) are shown. Zodiac casts were taken manually from a zodiac raft.
A single low relief sill (
