16.

FOLLOWING TNE EMPLACEMENT OF THE PERIDOTITE, THE FOLLOWING
EVENTS OCCURRED:

THE PERIDOTITE WAS ALTERED TO SERPENTINE BY THE ADDITION
OF WATER, PROBABLY IN THE FORM OF STEAM, UNDER SUITABLE CONDITIONS
OF TEMPERATURE ANO PRESSURE. (JUST WHAT THESE CONDITIONS ARE, WE
00 NOT KNOW.) THE SERPENTINE, AFTER COOLING, WAS INTENSELY SHEARED
AND FRACTURED. IN SOME MANNER, PRODADLY AGAIN BY HYOROTHESMAL
SOLUTIONS, SOME OF THE SERPENTINE WAS DISSOLVED ANO, WHILE THE

FRACTURES WERE STILL OPEN OR EVEN WHILE THEY WERE OCINC OPENED, THIS

“NASCENT SERPENTINE-FLULO FILLED ALL THE FRACTURES ‘D COOLEO SUFFIC=

JENTLY TO ALLOW THE QROWTH OF THE CHRYSOTILE VEINS. AS THC KoCE OF
THE CASSIAR BATHOLITH 18 LESS THAN A MILE AWAY ANO PROGADLY UNOCRLIECS
McDAME MOUNTAIN AT OEPTH, THIS WAS MOST PROBAGLY RESPONSIBLE FOR THE

FOLDING ANO WAS THE SOURCE OF THE HYDROTHERMAL SOLUTIONS.

THIS THEORY REQUIRES AT LEAST TwO PERIODS OF MOVEMENT,
WITH FORCES SO ORIENTED AS TO PRODUCE AN AREA OF TENSION OR LOW ROCK
PRESSURE IN THE VICINITY OF THE OREBODY; THE FIRST, OVRING THE

ORIGINAL EMPLACEMENT OF THE ULTRAMAFIC BODY; AND THE SECOND TO

PROOUCE THE FRACTURES AND HOLD THEM OPEN WHILE THE VEINS FORMED.

THERE MAY HAVE BEEN A THIRO. AS THERE 1S SOME POST=ORE SHEARING
INVOLVING THE FIBRE. MOST LIKELY THE OROGENY TOOK PLACE OVER

MILLIONS OF YEARS, WITH MANY SUCCESSIVE SURGES.

THE CLOSING EVENT, OF COURSE, WAS ICE EROSION, WHICH .
TRUNCATED AND REMOVED A LARCE PART OF THE SURFACE OREBODY, LEAVING

A THICK ACCUMULATION OF TALUS FIORE IN THE CIRQUE.

AF ‘