Google is too dumb to let me put the list of news in this column and falsely claims that all my pages are self-duplicates.
Google's so-called "Artificial Intelligence" is an abuse of the concept of intelligence!
Cosmo Howley mine - misidentification of
"chert" host rock
At the Cosmo Howley mine, Pine Creek area, NT,
the Au occurs within extensive stratiform quartz units. These were
to be stratiform cherts within the sequence. However, decrepitation
that all these quartz samples contain abundant high temperature fluid
with high CO2 contents and high internal pressures. These
of fluid inclusions are inconsistent with a chert host material
it is clear that the auriferous horizon is in fact an epigenetic quartz
related to the intrusion of the nearby granites. The decrepitation
show that this deposit is in fact a stratabound replacement type
and not a "syn-sedimentary exhalative gold in sedimentary cherts" type,
as has been stated elsewhere.
Enterprise Au mine, Pine Creek, NT
: CO2-rich fluids
An initial microthermometric fluid inclusion study of
from the Enterprise mine, came to the conclusion that the deposit
from fluids which lacked and CO2 content. A subsequent
study showed that over 50% of the samples collected had a prominent low
temperature decrepitation peak, indicating that CO2-rich
were in fact a major component of the mineralising fluids. Samples from
the eastern limb of the fold tended to lack CO2, but samples
from the ore bearing sheeted and stockwork vein areas always contained
CO2-rich fluid inclusions. The Au mineralisation is
related to the CO2-rich fluids.
The initial study was compromised by the inability
collect an extensive suite of relevant samples and the choice of the
to use transparent quartz, rather than the more common milky quartz. In
this case decrepitation analyses were a much more reliable indicator of
the mineralisation fluids than were the microthermometric data.