Cargill Township carbonatite complex, District of ... - Geology Ontario
Cargill Township carbonatite complex, District of ... - Geology Ontario
Cargill Township carbonatite complex, District of ... - Geology Ontario
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
R. P. SAGE<br />
grains disseminated throughout. Mica has wavey extinction and rims <strong>of</strong> grains are slightly<br />
darker in colour than cores suggesting a zonation. Apatite forms anhedral rounded grains some<br />
<strong>of</strong> which are elongated in outline. Carbonate forms an interlocking mosaic <strong>of</strong> grains with<br />
straight to curved grain boundaries.<br />
Reference No. 837<br />
Sample No. CCM49 246.8-247.25<br />
Clinohumite, apatite sovite.<br />
Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with curved to lobate<br />
grain boundaries. Clinohumite forms anhedral irregular grains partially altered to yellowish<br />
clinohumite. Apatite forms anhedral rounded grains; larger grains are somewhat elongated.<br />
There is minor anhedral, irregular-shaped, phlogopite. Carbonate forms an anhedral interlock<br />
ing mosaic <strong>of</strong> grains. Several grains display bent twin planes. Carbonate has curved to lobate<br />
grain boundaries.<br />
Reference No. 838<br />
Sample No. CCM49 193.0-193.4<br />
Olivine, phlogopite, apatite sovite.<br />
Fine grained, equigranular, massive, inequigranular-seriate, allotriomorphic, with curved to<br />
lobate grain boundaries. Olivine forms rounded anhedral grains with alteration to clinohumite<br />
along edges. Magnetite forms anhedral disseminated grains. Apatite forms rounded anhedral<br />
grains. Larger grains are elongated in outline. Phlogopite forms anhedral, irregular, brown<br />
grains, commonly with wavey extinction. Carbonate forms an interlocking mosaic <strong>of</strong> grains with<br />
curved to lobate grain boundaries.<br />
Reference No. 839<br />
Sample No. CCM49 190.0-190.7<br />
Phlogopite, magnetite, apatite sovite.<br />
Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with curved grain<br />
boundaries. Olivine forms rounded anhedral grains with local alteration to clinohumite along<br />
borders. Phlogopite forms anhedral irregular grains with faintly darker reddish brown rims.<br />
Phlogopite encloses small blebs <strong>of</strong> carbonate, and has wavey extinction. Magnetite forms an<br />
hedral irregular grains and may fill fractures. Apatite forms bead-like rounded grains with larger<br />
grains elongate in outline. Carbonate forms an interlocking mosaic <strong>of</strong> anhedral grains with<br />
straight to curved grain boundaries.<br />
Reference No. 840<br />
Sample No. CCM51 44.5-45.0<br />
Amphibole, olivine clinopyroxenite.<br />
Fine to medium grained, massive, inequigranular-seriate, hypidiomorphic. Olivine forms an<br />
hedral rounded grains, commonly in clusters. Weak alteration to iddingsite and serpentine oc<br />
curs along edges <strong>of</strong> olivine grains. Magnetite forms disseminated grains commonly associated<br />
with altered olivine or where pyroxene is altered to amphibole. Amphibole is a pleochroic,<br />
brown to green anhedral mineral forming irregular replacements <strong>of</strong> pyroxene and narrow rims on<br />
some pyroxene grains. Clinopyroxene is anhedral to subhedral in form and displays local<br />
schiller textures.<br />
Reference No. 841<br />
Sample No. CCM51 61.0-61.6<br />
Amphibole, olivine clinopyroxenite.<br />
Fine to medium grained, inequigranular-seriate, massive, hypidiomorphic. Olivine forms an<br />
hedral clusters <strong>of</strong> grains that locally appear interstitial to the pyroxene; there is minor alteration<br />
to serpentine. Magnetite forms anhedral disseminated grains in association with altered olivine<br />
and amphibole. Amphibole occurs as narrow rims on some pyroxene grains and as patchy al<br />
teration <strong>of</strong> pyroxene. Clinopyroxene forms anhedral to subhedral grains, some with poorly de<br />
veloped schiller texture.<br />
Reference No. 842<br />
Sample No. CCM55 42.6-43.1<br />
Olivine, amphibole-bearing clinopyroxenite.<br />
Fine to coarse grained, inequigranular, allotriomorphic, with curved to straight grain bounda<br />
ries. Pyroxene forms anhedral to subhedral interlocking grains with well developed schiller tex<br />
ture. Clinopyroxene has the extinction angle <strong>of</strong> augite. Minor phlogopite occurs as small iso-<br />
41