244 AUSTRALASIAN ANTARCTIC EXPEDITION. 



V. EXPLANATION OF PLATES. 

 PLATE XXXVI. 



Fig. 1. Gale-silicate marble. Photo of the natural surface developed by weathering 

 under Antarctic conditions of wind and drifting snow. The softer carbonates 

 are removed, leaving the harder silicates standing prominently in relief. 

 Concomitant with the metamorphism of the rock, are evidenced contortion 

 and brecciation of the harder bands. Two-thirds natural size. 



Fig. 2.Calc-silicate-Gneiss (Garnet-pyroxene-Marble.) Specimen No. 658. The 

 photograph shows alternating bands of calcite, green pyroxene and felspar, 

 and brown garnet. 



The continuous black bands are seams of grossular-andradite, and the 

 remaining black lenses and streaks are hedenbergitic pyroxene associated 

 with white felspar. About natural size. 



PLATE XXXVII. 



Fig. 1. For sterile-Marble. Specimen No. 318. The microphotograph shows calcite, 

 dolomite, forsterite, spinel, and the aluminous amphibole, edenite. 



The amphibole is typically developed as coronae around the forsterite 

 grains. Isolated grains with amphibole cleavage are present in the lower 

 half of the photograph. The clear carbonate grains immediately above are 

 dolomite. Magn. 40 diameters. 



Fig. 2. Garnet-pyroxene-marUe. Specimen No. 658. The constituents .shown are 

 garnet, green pyroxene, scapolite, microcline, a symplektitic intergrowth of 

 scapolite and quartz, and grains of titanite, apatite and calcite. Magn. 40 

 diameters. 



Fig. 3. Garnet-pyroxene-Marble. Specimen No. 730. The constituents are garnet, 

 epidote, plagioclase, green pyroxene, calcite, and quartz. The garnet is 

 surrounded by a shell of epidote, intergrown with quartz and some calcite. 

 The large plate of plagioclase is filled with a sericitic decomposition product, 

 and is itself bordered by a perimorph of epidote. Magn. 40 diameters. 



Fig. 4. Carbonate-free cole-silicate rock. Specimen No. 128. The constituents are 

 clinozoisite, epidote, plagioclase, microcline, tremolite and quartz. The 

 porphyroblasts of epidote and felspar are set in a ground mass of tremolite, 

 zoisite, quartz and felspar. The felspar porphyroblasts are remarkably free 

 from the groundmass constituents. Magn. 40 diameters. 



Sydney: Alfred James Kent, Acting Government Printer 1023. 



