Cargill Township carbonatite complex, District of ... - Geology Ontario
Cargill Township carbonatite complex, District of ... - Geology Ontario
Cargill Township carbonatite complex, District of ... - Geology Ontario
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Appendix A Petrographic Descriptions,<br />
Chemical Analyses, Normative Compositions, and<br />
Statistical Compositions <strong>of</strong> Lithologic Units <strong>of</strong> the<br />
<strong>Cargill</strong> <strong>Township</strong> Carbonatite Complex.<br />
TABLE A-l. PETROGRAPHIC DESCRIPTIONS OF WHOLE-ROCK<br />
SAMPLES* FROM THE CARGILL TOWNSHIP COMPLEX.<br />
Reference No. 771<br />
Sample No. CCM6 102.9-103.3<br />
Silico<strong>carbonatite</strong>.<br />
Fine to medium grained, equigranular, allotriomorphic, with curved to ragged grain boundaries.<br />
Sample has undergone deformation. Apatite forms rounded anhedral grains. Magnetite forms<br />
anhedral disseminated grains. Phlogopite forms an anhedral, interlocking mosaic with pervasive<br />
and strong kinking <strong>of</strong> (001) cleavage. Carbonate forms rounded, composite, interstitial grains.<br />
Reference No. 772<br />
Sample No. CCM6 131.8-132.2<br />
Silico<strong>carbonatite</strong>.<br />
Fine to medium grained, equigranular, massive, allotriomorphic with curved to straight grain<br />
boundaries. Magnetite forms anhedral disseminated grains. Apatite forms rounded to sub<br />
rounded grains. Amphibole occurs as somewhat acicular, anhedral, irregular grains forming an<br />
interlocking mosaic. Carbonate forms an interlocking mosaic <strong>of</strong> anhedral grains.<br />
Reference No. 773<br />
Sample No. CCM6 140.0-140.4<br />
Silico<strong>carbonatite</strong>.<br />
Fine to medium grained, massive, equigranular, hypidiomorphic. Magnetite is anhedral and<br />
disseminated throughout. Amphibole forms subhedral to euhedral acicular grains. Phlogopite<br />
forms anhedral to subhedral grains in an interlocking mosaic. Carbonate forms anhedral inter<br />
stitial grains.<br />
Reference No. 774<br />
Sample No. CCM6 141.4-141.65<br />
Apatite, magnetite, amphibole, phlogopite Silico<strong>carbonatite</strong>.<br />
Medium grained, equigranular, massive, allotriomorphic, with curved to straight grain bounda<br />
ries. Magnetite forms anhedral disseminated grains. Phlogopite forms anhedral grains with<br />
darker brown pleochroic rims. Amphibole is somewhat acicular with very pale pleochroism and<br />
weak zoning <strong>of</strong> larger grains under crossed nicols. Apatite forms rounded anhedral grains. Car<br />
bonate forms an interlocking mosaic <strong>of</strong> anhedral grains.<br />
Reference No. 775<br />
Sample No. CCM6 151.3-151.65<br />
Apatite, magnetite, amphibole, phlogopite sovite.<br />
Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda<br />
ries. Amphibole is weakly pleochroic, acicular, rarely poikilitically encloses carbonate, and un<br />
der crossed nicols birefringence suggests zoning. Magnetite is anhedral and disseminated.<br />
Phlogopite forms anhedral grains with dark brown pleochroic rims. Minor apatite occurs as<br />
rounded anhedral grains.<br />
Reference No. 776<br />
Sample No. CCM6 243.9-244.25<br />
Magnetite, phlogopite, apatite sovite.<br />
Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda<br />
ries. Phlogopite forms anhedral grains with dark brown pleochroic rims. In some grains there is<br />
*All samples are from drill core. The locations <strong>of</strong> the drillholes are shown on Figure 3 (Chart<br />
A).<br />
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