. Annual report . alfissures and joint-like cracks that cut through a series of slightly inclined metamor-phosed fragmental rocks of pre-Cambrian age, known as the Cobalt series (Fig. 1).A few productive veins of similar form have been found in the adjacent intrusive dia-base, known as the Nipissing diabase, and in the Keewatin, the oldest or basementseries of the distiict, consisting typically of basic volcanic rocks. The two most pro-ductive veins in the Keewatin have been vein 26 on the Nipissing and that of theTemiskaming. The former vein lies near the edge of Peterson lake and close to th
. Annual report . alfissures and joint-like cracks that cut through a series of slightly inclined metamor-phosed fragmental rocks of pre-Cambrian age, known as the Cobalt series (Fig. 1).A few productive veins of similar form have been found in the adjacent intrusive dia-base, known as the Nipissing diabase, and in the Keewatin, the oldest or basementseries of the distiict, consisting typically of basic volcanic rocks. The two most pro-ductive veins in the Keewatin have been vein 26 on the Nipissing and that of theTemiskaming. The former vein lies near the edge of Peterson lake and close to thewestern edge of the diabase sill. Before erosion of the sill took 7 lace vein 26 laybeneath the sill or in its foot-wall. The Temiskaming vein, on the other hand, lies inthe upper or hanging wall of the sill. There are examples of veins which run fromthe conglomerate and other fragmental rocks of the Cobalt series into the underlyingKeewatin, and there are veins, , Nova Scotia and Temiskaming veins, which run. Veins ! Hypothetical veiri3 Fig. 7. GENERALIZED VERTICAL SECTION THROUGH THE PRODUCTIVE PART OF THE COBALT AREA. The section shows the relations of the Nipissing diabase sill to the Keewatin andthe Cobalt series, and to the veins. The eroded surface is restored in the section. Thesill is less regular than the illustration shows it to be. B and C represent a large number of veins that are in the fragmental rocks, Cobaltseries, in the lower or foot-wall of the eroded sill. N represents a type of vein, suchas No. 26 on the Nipissing, in the Keewatin below the eroded sill, and L a type such asone under Peterson lake, in the Keewatin foot-wall, but not extending upward into thesill; K, a vein in the sill itself, such as No. 3 on the Kerr Lake property; T, a vein, suchas that on the Temiskaming or Beaver properties, in the Keewatin hanging wall and ex-tending downward into the sill. downward from the Keewatin into the underlying, intrusive Nipissing diabase. Thevein on the
Size: 2223px × 1124px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
