THE GOWGANDA LAKE DISTRICT, ONTARIO 

 TABLE II 



667 



I. Lost Lake granophyre. Marked °, determined by N. L. Bowen, others by 

 N. L. Turner. 



II. Granophyric diabase, Pense Township. Analyst, N. L. Bowen. 



III. Granophyric diabase, Bartlett property, Gowganda. Analyst, N. L. Bowen. 



IV. Normal diabase, O'Brien mine. Cobalt. Analyst, N. L. Bowen. 



V. Aplite vein in diabase, James Township. Analyst, N. L. Bowen. 



TABLE III 



I. Lily Lake granophyre. Analyst, N. L. Bowen. 



II. Lost Lake granophyre. Analyst, N. L. Bowen. 



III. Albite rich layer at contact. Lost Lake. Analyst, N. L. Turner. 



IV. Altered sediment near contact. Lost Lake. Analyst, N. L. Bowen. 



V. Altered sediment near contact. Lost Lake. Analyst, N. L. Turner. 



ORIGIN OF GRANOPHYRE 



Summing up the evidence of the upper contacts of the sills, just 

 described, we have at the Foot Lake sill, in one place, the special 

 development of granophyric material in the diabase quite close to its 

 contact with altered slate or adinole, the granophyre interstices 

 having practically the same composition as the adinole and evidently 

 derived from the latter by some process of transfusion. A little 

 farther south where the action has been more intense we have a wider 

 zone of adinole developed. Part of the adinole close to the diabase 



