part 2] grais'ite-UjSEIsses of southeeis' eyke penhstsijla. 



5. The Gteantte-G-jN-eisses of Southern' Etbe Peninsula 



(South Australia) and their Associated Amphibolites. 



By Cecil Edgae, Tillet, B.Sc, A I.C. (Communicated by 



Dr. H. H. Thomas, M.A., Sec.G.S. Eead February^[2nd, 



1921.) 



Contents. 



Page 

 I. Introduction and Previous Literature 75 



II. The Divisions of the Pre- Cambrian of Southern Eyre 



Peninsula 76 



(a) The Hutchison Series. 



(b) The Flinders Series. 

 , (c) The Warrow Series. 



(d) The Dutton Series. 



III. The Flinders Series 78 



(a) Geog'raphical Extent. 

 (6) Constitution. 



IV. The Relationships of the Amphibolites to the Associated 



Gneisses 81 



V. The Petrography of the Granites and Granite -Gneisses of 



the Flinders Series 84 



(a) Gneisses of the Lincoln Area. 

 (6) Gneisses of the Sleaford Area. 



VI. The Petrography of the Amphibolites and Allied Types in 



the Flinders Series 98 



(a) The Amphibolites and Hornblende-Schists. 

 {b) The Pyroxene-bearing Types. 



VIL The Origin of the Amphibolites 107 



VIII. The Metadolerites of the Lincoln Area 116 



(a) General Description. 

 (h) Petrography. 



(c) Chemical Changes induced by Metamorphism. 



IX. Comparison of the Flinders Series with the Rocks of other 

 I Pre-Cambrian Areas 127 



X. Bibliography and Summary 130 



I. Introduction. 



The basement platform which forms the foundation of Southern 

 Eyre Peninsula, and on which the much younger Tertiary and 

 Recent sediments repose, consists of a complex of igneous and 

 metamorphic rocks, which in their lithological and petrographical 

 characters bear not only a remarkable resemblance to rocks of 

 known Pre-Cambrian age in other parts of the State, but also to 

 the well-known Pre-Cambrian tracts in other regions of the world. 



The evidences for the Pre-Cambrian age of the Eyre Peninsula 

 rocks cannot rest on palseontological evidence, for there are no 



Q. J. G. S. No. 306. H 



