ThomasEdwardLane.pdf

aqpects of the largar topic. The interrelotianrhlp of these chapters to
the evolution of ths deposit is s umized in Fig. 1.6. Part a!le places
NZX within the regional context. The aeeond part establishes the
sedimentary and stratigraphic frmmrk of the k t rocks, rssulting in
a new interpretation of shallow carbonate platform sadhentation under
the influence of tectonics and euntasy. Part three presents the
petrcgraphic and gaoehanlcai attributes the various crystal types of
dolomites, sulphldeb and sulphatea. This part of the study elaborates s
clear, paregenetic sequence of diagenetio events which can generally be
grouped into an orbvician phase of karst fornation and dolanitleation
and n later Silum-oevonian phase of deep burial dolmitizatlon @nd ore
erqlacemnt. This temporal subdivision provides e convenient frmwork
for the following two sections which cover the nature and interpretation
of the rock bodlea. Pert four outlines the mltistsge formation and
karstifieation of early dolostones durlng Ordovician sedimentation and
burial. Part five describes and interprets the origin of the emnmi-
call* inportant sphalerite / blwite -1exes. The final aewnt,
pa:t six, integrates ail Information into e concise synthesis.
17