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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: 2MAR$ who wrote (49539)	3/13/2014 4:02:58 AM
From: average joe	Respond to of 69300

There is a volcanic pipe or some say impact crater in western Canada that is a dead zone for fish and game and the Indians avoid. Water from the pond in the middle of the island is enriched in REE and the rock is closer to carbonatite than kimberlite but it remains unidentified to date. Below is a memo on the occurrence from a famous professor... "An important cluster of craters is centred on... ... lake lies 25 miles east of ..., and 30 miles northwest of ..., at Lat. 00 00’ 0. and Long. 00 00’’ W.. The craters occur over the area from ..., numbering at least twenty. It is probable that the cluster extends northward as far as the ...... occurrence at the south end of ... Lake, because circular structures have been identified to the west of ...Lake, halfway between ... and ... Lakes. The craters differ from those already shown, because these pipes are intruded through the Silurian and Ordovician limestone, and the Winnipeg sandstone at the base of the Paleozoic section. The best known of the craters is ... Island. The island, rises above the lake, and has a small circular lake at its centre. The central lake has the “comma” shape, so typical of many of the ultra-high pressure craters where the magma broke through the bedrock wall of the crater. The island is well known to geologists who have attributed its origin to a variety of causes, including slumping into solution cavities, wave erosion on a reef mass, a diatreme, a meteor crater, and proximity to a desert. The exposed bedrock of ... Island consists entirely of dolomite breccia with a liberal sprinkling of fine frosted sand grains. Stratigraphically, the island would be near the middle of the Silurian dolomite section. The Precambrian shield is at a depth of approximately 900 feet. The shield is overlain by the Winnipeg sandstone. The sandstone consists of fine-grained frosted quartz grains in sandstone that is usually unconsolidated. The sandstone is overlain by Ordovician dolomite. The ... dolomite breccia is cemented. Fragments range in size from dust to large blocks of dolomite 60 X 100 feet. The sand grains are similar in appearance to those encountered in drill holes in the area. The structure is interpreted as the bedrock portion of a volcano, similar to those already described. The raised rim and central “comma” shaped lake are typical. Heavy minerals panned from the beach sands consist of pyrope, green clinopyroxene, chromite, and ilmenite. The compositions of the first two are typical of the grospidite subfacies, indicating the presence of an ultramafic pipe of peridotite or kimberlite composition. The existence of several other pipes in the area suggests the volcanic origin of all. This interpretation would mean the brecciation is caused by the intrusion of the pipe. The sand grains indicate considerable transportation in the wall material of the pipe because they originate several hundred feet below their present position."