ThomasEdwardLane.pdf

production is 1975. Wining and exploration drilling coutinved thmugh
1990 during which tlre 1.2 million tons were milled. hlrirq the early
stages of mining Comn (19821 studied the host mcks and the irviopic
geochemistry of the sulphides and cerbonates. At the s m time Diilon
(1978) analyzed the trace elcmnt geochemistry of the depsit. During
the late 1970's and early 1980's eowrehensive regimsl studies of
sedhsntology, stratigraphy, diagenesis and dolaaiti~ation et Me~norial
University and Newfoundland Departmeat of nines lbavesque, 1918; Prstt,
1979; Hsy*ick, 1984; Knight and Jmea, 1987) artablirhed a regional
context with which to relate the NZN deposit.
1.3 m e e of the ahlay
IS
The mat critical aspect for interpretation of IYT deposits is the
understanding of the thing of mineralimtion. This sense of the
tewral also has inportant irplicetions for the interpretation of
dalmitiration. This study nttwts to put the history of dolaaitizs-
tion, bmoiation and rulphide mineralization in perspective thmugh a
careful L'e~~nstNEtiOn of the sedimentary and diagennetic events which
produced the -leu mks of the uppar Cotache Pornatim. Thls
e,ppmach differs from m st previas descriptions of this and other M11
deposits. Those studies lamely focus on the geology and gsochmistry
of th ole-stwe -8. In this study, in contrast, a detailad analysis
or the orystal cant history incorporates the ore-atrge within a broad
spectm Of events which produced the host dolastonan.
Dolostones are described and interpreted in a new manner as the