Scott Glacier Area

We now move east from the Nilsen Plateau into the drainage of the Scott Glacier in Fig. 6.12 formerly known as the Thome Glacier. Virtually the entire area drained by the Scott Glacier and its tributaries exposes rocks of the basement complex consisting of the La Gorce Formation, the Wyatt Formation, the Ackerman Formation, and the 

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Grunow AM, Encarnacion J (2000) Terranes or Cambrian polar wander New data from the Scott Glacier area, Transantarctic Mountains, Antarctica. Tectonics 19 168-191... 

The mineral composition (mode) of the Wyatt Formation in the Scott-Glacier area was determined by Minshew (1967) and is listed in Appendix 6.7.3.1 followed by chemical analyses in Appendix 6.7.3.2. The rocks of the Wyatt Formation in the La Gorce Mountains were altered either by the original magmatic fluid or during later metamorphism. In extreme cases, plagioclase was completely altered to sericite or saussurite (Stump et al. 1986). Saussurite is a mineral aggregate composed of albite and zoisite or epidote with variable amounts of calcite, sericite, and prehnite (Jackson 1997). 

Fig. 6.14 Silica-variation diagrams of the silicic porphyries of the Wyatt Formation and of the Ackerman Formation in the La Gorce Mountains and in the upper Scott Glacier area (Data by Stump et al. 1986 Minshew 1967)...

A more recent attempt to date rocks of the Wyatt Formation in the Scott Glacier area by Stump et al. (1986) was also frustrated by the scatter of data points. 

Fig. 6. 15 A suite of five whole-rock samples of the Wyatt Formation collected by V.H. Minshew from outcrops between Mt. Wyatt and Mt. Gardiner in the Scott Glacier area define two straight lines labeled A and B derived by least-squares linear regression. Line A which includes all five samples plus one duplicate analysis yields a date of 524 13 Ma and a high initial Sr/ Sr ratio of 0.711919 0.000547 (la). Line B is defined by three selected samples and corresponds to a precise date of 802 2 Ma but it has an impossibly low initial Sr/ Sr ratio of 0.69775. We conclude that the igneous rocks of the Wyatt Formation are older than 524 13 Ma but younger that 802 2 Ma. These previously unpublished data by G. Faure are presented in Appendix 6.133. In addition. Appendices 6.7.3.1 and 6.7.3.2 contain modal analyses and chemical compositions of rocks of the Wyatt Formation from Minshew (1967)...

Table 6.5 Age determinations of rocks in the La Gorce Mountains and other parts of the Scott Glacier area (Data from Mirsky 1969 Stump et al. 1986 Van Schmus et al. 1997 Faure unpub. [Appendix 6.7.3.3])...

Modal and Chemical Compositions and Rb-Sr Systematics of the Wyatt Formation, Scott-Glacier Area and Wisconsin Range, Transantarctic Mountains... 

Modal Analyses of the Wyatt Formation Collected by V.H. Minshew in the Scott Glacier Area (All Data in This Table Are from Minshew 1967 Fig. 6.12)... 

Rb-Sr Systematics, Wyatt Formation, Scott-Glacier Area, Queen Maud Mountains (Faure, Unpubiished)... 

Blackburn QA (1937) The Thorne Glacier section of the Queen Maud Mountains. GeogrRev 27 598-614 Borg SG (1980) Petrology and geochemistry of the Wyatt Formation and the Queen Maud bathoUth, upper Scott Glacier area, Antarctica. Unpublished MS thesis, Arizona State University, Tempe, AZ... 

Appendices 7.8.1 Chemical Composition of Metavolcanic Rocks, Wyatt Formation, Weight Percent (Faure unpublished Minshew 1967) Scott Glacier Area and Wisconsin Range in ... 

Ford and Himmelberg (1976) also pubfished the average chemical composition of 27 specimens of the Thiel Mountains Porphyry, which they classified as a rhyodacite, as well as chemical analyses of the cordierite and the orthopyroxene aU of which are fisted in Appendix 8.5.1. The chemical composition of the Thiel Mountains Porphyry closely resembles the chemical compositions of the metavolcanic rocks of the Wyatt Formation on Mt. Gardiner in the Scott Glacier area and on Metavolcanic Mountain at the head of the Reedy Glacier (Appendix 7.8.1). 

The Fremouw Formation of the Beardmore Glacier area extends north as far as the Mackay Glacier of southern Victoria Land where it is correlated with the Lashly Formation. It also extends southeast to the Nilsen Plateau (Barrett et al. 1972 Elliot 1975 Collinson et al. 1994). However, sedimentary rocks of Triassic age do not occur in the Scott Glacier area (Doumani and Minshew 1965 Minshew 1966, 1967), in the Ohio Range (Long 1962, 1965), and in the Pensocola Mountains (Schmidt et al. 1965 Schmidt and Eord 1969). 

The Beacon rocks on Tillite Spur in the valley of the Olentangy Glacier (Fig. 7.2) were divided into the same three formations that Doumani and Minshew (1965) described on Mt. Weaver in the Scott Glacier area ... 

The surveys of radioactivity of Zeller and Dreschhoff included areas in southern and northern Victoria Land (Dreschhoff et al. 1983a Zeller et al. 1986), the Ellsworth Mountains (Dreschhoff et al. 1980, 1992), and the Scott Glacier area of the Queen Maud Mountains (Dreschhoff et al. 1983b). In spite of the large areas that were surveyed in each region, no noteworthy uranium deposits were found. 

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