WARTA GEOLOGI WARTA GEOLOGI - Department Of Geology
WARTA GEOLOGI WARTA GEOLOGI - Department Of Geology
WARTA GEOLOGI WARTA GEOLOGI - Department Of Geology
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PERTEMUAN PERSATUAN (Meetings of the Society)<br />
TECHNICAL TALK<br />
Some organic geochemical thoughts on concretions from<br />
New Zealand<br />
Michael J. Pearson<br />
Consultant Petroleum Geochemist and Basin Modeller, University of Aberdeen &<br />
Associate Editor Journal of Petroleum <strong>Geology</strong><br />
28 February 2012<br />
<strong>Department</strong> of <strong>Geology</strong>, University of Malaya<br />
Abstract: A wide variety of concretionary bodies occur<br />
in the Miocene strata of New Zealand ranging from<br />
a few cm to 10 m in size. Some of these are classic<br />
spherical concretions formed during early sediment<br />
burial by diffusion and many of them display attractive<br />
septarian structures showing different coloured<br />
generations of calcite fill. Organic lipid extracts<br />
from the fills are distinctly different to those from<br />
the concretion bodies implying later origins for their<br />
fluids. Other concretions are more tubular and their<br />
lipids contain some organic markers that suggest they<br />
formed along conduits for ancient methane seepage.<br />
Warta Geologi, Vol. 38, No. 1, January – March 2012<br />
13
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