Contributions to Antarctic Research II by David H. Elliot

By David H. Elliot

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Published via the yankee Geophysical Union as a part of the Antarctic examine Series.

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3. Diamictitesare an end-member in the rangeof glacialdepositsand indicateice ..... 4. Sandstone-dominated, measured section CHIfromthePagoda Formation, Cherry Icefall. (SeeFigure3 forthekeytothe HORNERAND KRISSEK:FINE-GRAINEDCLASTICSFROM BEARDMOREGLACIER Section 120 39 CPZ Mackellar/Pagoda contact Diamictite:Gray-green,poorly sorted 110 lOO Scree cover Diamictite: Gray-green, abundant coarse quartz grains, rare chert and granite pebbles 9o Scree 8o cover Siltstone: Dark gray, micaceous 90% siltstone, 10% fine-grained sandstone 7o 6o 5o interbeds 70% siltstone, 30% sandstone Interbedded sandstone and siltstone, sandstone beds are 20-40 cm.

Measured section TGA fromthe MackellarFormation, showing the large-scale coarsening-upward sequence, followed by deltalobeabandonment anda returnto quietor deepwater conditions. ) small-scale ripplecrosslamination. Thesesiltyshales are interpreted to be delta-front deposits withinthe Mackellarbasinandrepresent quietwaterdeposition withsporadic episodes of morerapidsedimentation. Elam, 1985]. The continuedinflux of oxygen- and exhibitsiltylaminations andraresiltyinterbeds. Theseunderflows are importantto the interpretation of bottom-water conditions in the rangefrom 2 to 27 m in thicknessand exhibita consistent regionalthickness patternthatmaydefine the originalshapeof this portionof the Mackellar alepositional basin (Figure 10).

The difference was consistent with the results from theElephantMoraine. On the ice field adjacentto the Allan Hills, it takesonly 61 + 5 daysof ablationat summerratesto equal the annual amount. The trendin the datasuggests thataveragesummer temperatureson the ice fields increase from the ElephantMoraine towardthe marginof the ice sheet. As a result, summerablationrates (see Table 3 and Figure 7) rise toward the margin of the ice sheet, requiring slightly fewer days in the Allan Hills to equalthe amountof ice lostannuallyat eachlocality.

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