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Glaciation of Observation Hill, Hut Point Peninsula, Ross

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Glaciation of Observation Hill, Hut Point Peninsula, Ross GLACIATION OF OBSERVATIO N HILL, H U T POINT PENINS U LA , ROSS ISLAN D, A NTARCTICA B)I R OBERT B. FORBES (Geology D epartment and G eophysical Institute, University of Alaska, College, Alaska, U.S.A.) and D ONALD W . E STER (Geology Department, U niversity of Alaska, College, Alaska, U .S .A.) ABSTRACT. East- west glacia l stria tions a nd grooves were discovered on the summit ridge of O bservation Hill, which pa ra llel the present direction of shelf ice movement to the east a nd south-cast of the Hut Point peninsula. T his evidence suggests that Observation Hill may have bcen g lacia tcd by a thickened JVIcMurdo lobc of the adj acent R oss I ce Shelf, moving west, as it d oes today. RltSUME. On a decouvert sur la crete du sommet d e l' Obse rvation Hill des sillons de direction parallele au mouvemen t actuel de !'Ice ShelUt l'est et a u sud-est d e la presqu'il c Hut Poin t. Il es t d onc probable que l'Observati on Hill ctait englacee d a ns la region d e M cMurdo, par un lobe plus epais du R oss Ice Shelf, se dep lacant vers l'Ouest comme il le fait a ujourd'hui. ZUSA MM EN FASSUNG . Am G ipfelgra t des O bservation Hill wurden in west-iistli cher Richtung verl aufende glaziale Furehungen fes tgestellt, pa ra llel zu den rezcnten Bewegungcn des Ice Shelf iis tlich und sudostlich der Hut Point-Ha lbinsel. Dies lasst vermuten , dass d er Observation Hill im Gcbiet del" M cMurdo Sound von einer ursprunglich machtigeren Z unge des benachbarlen R oss I ce Shelf erfass t wurde, die sich wie heutzut age nach VVesten bewegte. I NTR ODUCTION In D ecember 1962 , we found east- west trending glacia l striations and grooves on the summit ridge of Observa tion Hill, adjacent to M cMurdo Nava l Air Facility (Figs. I and 2 ) . Observa tion Hill is a familiar landma rk to those who have worked and visited in the M cMurdo Sound region, and it is oft en climbed by perso nnel wishing to visit Scott's cross, which is on the summit. Observa tion Hill has been discussed previously by Fen-ar ( 1907), David and Pries tl ey (19 14), T aylor ( 1922) and D ebenham (1923). These authors have treated Observa tion Hill a nd the " G a p" (Fig. 2) as glacia ted landforms, but we have found no reference to glacia l striati ons a nd/or grooves in these discuss ions. L OCATION AND D ESCRIPTION OF LINEATIONS Stria tions (Fig. 3) were found a t four localities on the outcro ps of trachyte which form the summit ridge (shown as localities Nos . I , 2 , 3, and 4 on Fig ure SA). Locality No. 4 also displays deep grooves which tra nsect the striations at angles ra nging between 10 and 20 degrees (Fig. 4) . All locali ties a re on the cres t of the ridge, or o n the west slope adj acent to the cres t, b ut many outcrops on the east slope a re m antled by rubLl e, and additiona l lineation occurrences m ay be concealed by thi cover. The strike of the stria tions ranges from 2S0 to 270 degrecs, a nd the average strike of the deep grooves at locality No. 4 is 280 d egrees. The a ttitudes o f" the stria tions and grooves are discorda nt to layering a nd fl ow structures in the trachytes. vVeathered a nd indistinct features simila r to cha tter marks a nd fricti on cracks a lso occur, but th ey do no t appear to o ffer d efinitive evidence for the direction of ice movem ent. Stepped outcrops occur on the west slopc, adjacent to the crest, which suggest ice quarry­ ing. H owever, the east dip of the trachyte fl ows on the summit ridge would enco urage quarrying on the west slope whether the ice moved east or wes t. 8 7 Downloaded from https://www.cambridge.org/core. 01 Oct 2021 at 16:46:42, subject to the Cambridge Core terms of use. 88 JOURNAL OF GLACIOLOGY Geomorphological evidence for the direction of ice movement seems to be inconclusive, but the correlation of striation and groove orientations with current ice movement vectors east of the Hut Point peninsula may be significant. Fig. r. Mal) oJ the M cA1urdo Sound region; based on the /962 / : / , 000, 000 mal) as comjJiled and drawn b) 1 the American Geographical Society PARALLELISM OF GLAC IAL LINEATIONS AND I CE SHELF MOVEMENT VECTORS We were first impressed by the approximate parallelism of the glacial striations and grooves on Observation Hill to present ice shelf movement directions, when we noted the vectors computed by Macdonald (196 I) from observations made during 1957- 58; and more recently, to those presented by Stuart a nd Bull (1963) for a larger segment of the ice shelf during 1959- 60 (Fig. 5B). The westernmost part of the McMurdo Ice Shelf is currently moving due west. This parallelism suggests that Observation Hill was glaciated by an enlarged lobe of the adjacent McMurdo Ice Shelf, moving westward as today. A lobe capable of inundating the 747 ft. (227 m.) summit of Observation Hill would have been grounded on the adjacent bottom of McMurdo Sound. The minimal total thickness of such a lobe would probably exceed Downloaded from https://www.cambridge.org/core. 01 Oct 2021 at 16:46:42, subject to the Cambridge Core terms of use. GLA C IAT I ON OF OBSERVATI ON H I LL, RO SS I S LA N D, A N TAR C TI C A 89 ~Hill Fig. 2. East obliqlle aerial photogral)" rif the Hilt Point IJelzinSllla, jrolll Crater H ill to Calle Armitage . (U. S. N avv IJllOtOgral)h) Fig. 3 . Glacial striatiolls; locali£l' ./'lo. 3 , Ob servatio n Hill Downloaded from https://www.cambridge.org/core. 01 Oct 2021 at 16:46:42, subject to the Cambridge Core terms of use. JOURNAL OF GLACIOLOGY Fig. 4. Glacial striatum transected by xriiiiirs; locality No. 4, Observation HUl Fig. 5. A. The uimimt rn/i.r nj'Ohwnnlinn Hill, shai in* the location and orientation of glacial lineations. (Tofmaur/i/iv tun Sheet 7, Naval Air Facility. McMnrdo. Antarctica; f.S. Nan Hydra graphic Office) B. Ice movement directions for the Me Mania Ire Shelf. 1 i/jtj fin, m taken from Stuart and Bull (1963) Downloaded from https://www.cambridge.org/core. 01 Oct 2021 at 16:46:42, subject to the Cambridge Core terms of use. GLAC IAT I ON OF O B SE RV A TI ON H I LL , R OS S I S L AN D , A N T A R C TI CA 9 1 8 00 m . (considering such variables as a possible 150 m . depression of sea-level d uring the WUrm glaciation, as proposed by Hollin ( 19 62 ) , and isostatic complications). An a lternative explanation would be glacia tion by ice descending from Victoria La nd, m oving to the east across M cMurdo Sou nd to the Hut Point peninsula . Such a mass, in our opinion, would tend to fl ow north-east ra ther tha n east, and thence nor th along the axis of the McMurdo Sound embayment (Fig. I). The glaciation of the 747 ft. (227 m.) summit ridge may correlate with the eleva tion of mora ines containing continental rock types at 800 ft. (244 m .) above sea-level, and higher, near Capes Crozier a nd R oyds, to the north and north-east of the Hut Point peninsula on Ross I sla nd (Fig. I). R ecen tly Sped en ( 19 62) has described glacial stria tions on an outcrop of tuffaceous sedimen ts containing Qua terna ry marine fossils, 6 00 ft. ( 182 m .) above sea-l evel o n Black Island, and m oraines at the 8 0 0 ft. (244 m .) level on Brown I sla nd. H owever, glacial lineations, erratics a nd m oraines have been widely repo rted from many localities in the R oss Archipelago, at eleva tions ranging from sea-level to a t least 2,0 00 ft. (610 m.) above sea-level, a nd the glacial history is cl early complex and multicycl ic. A lthough the glacia tion of O bserva tion Hill and the previously cited localitites a bove Capes R oyds and C rozier may represent the same event, no a ttempt is made here to correla te the glacia tion of Observation Hill with one of the fo ur regional glacial stages proposed by previous workers. Pewe ( 19 6 0 ) has recognized four successive Q uaterna ry glaciations in the M cMurdo Sound region, each less extensive tha n the former ; and Bull and others ( 19 6 2 ) have proposed a simila r glacial history, based on their studies 0[' the Wright and Victoria V all ey systems. R E GIONAL IMPLICATIONS T he east- west orien tation of the stria tions and grooves on the summit of Observa tion H ill m ay be importan t to the reconstruction of the glacia l history of the region. If westward movement prevailed , as today, a nd the M cMurdo lobe of the R oss I ce Shelf glaciated Observation H ill, the flow of ice from the Victoria L a nd glaciers, including the Koettli tz Glacier stream, seem s to have had little diversionary effect on the fl ow of the western pa rt of the McMu rdo Ice Shelf.
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