Cargill Township carbonatite complex, District of ... - Geology Ontario

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CARBONATITE - ALKALIC ROCK COMPLEXES: CARGILL TOWNSHIP pronounced bending of (001) cleavage. Actinolite forms a few scattered euhedral acicular grains. Magnetite is anhedral and disseminated. Apatite forms rounded anhedral grains. Car bonate forms an interlocking mosaic of grains. Some grains display bent twin lamellae. Reference No. 777 Sample No. CCM6 248.65-248.95 Phlogopite, magnetite, apatite sovite. Medium grained, equigranular, allotriomorphic, with curved to straight grain boundaries. Phlogopite is anhedral to subhedral in form; grains display dark brown pleochroic rims. Mag netite is anhedral and disseminated throughout. Apatite forms rounded anhedral grains. Car bonate forms an anhedral interlocking mosaic of grains. Reference No. 778 Sample No. CCM6 256.7-257.0 Phlogopite, magnetite, apatite sovite. Medium grained, equigranular, massive allotriomorphic, with straight to curved grain bounda ries. Scattered acicular amphibole grains are anhedral to euhedral in form. Phlogopite forms anhedral grains with dark brown pleochroic rims. Magnetite forms anhedral, disseminated grains. Apatite forms anhedral rounded grains. Carbonate forms an interlocking mosaic of an hedral grains. Reference No. 779 Sample No. CCM6 274.4-274.8 Olivine, magnetite, phlogopite, apatite sovite. Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda ries. Olivine forms rounded anhedral grains; several grains are altering to clinohumite. Magnet ite forms anhedral disseminated grains. Phlogopite forms anhedral grains with brown pleochroic rims; some grains have bent (001) cleavages. Apatite forms rounded grains. Carbonate grains form an interlocking mosaic. Reference No. 780 Sample No. CCM6 328.05-328.35 Magnetite, biotite, apatite sovite. Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda ries. Phlogopite forms anhedral grains with dark brown pleochroic rims; some display bent (001) cleavage. Magnetite forms anhedral disseminated grains. Olivine forms rounded grains, some with serpentine along fractures. Apatite forms rounded anhedral grains. Carbonate forms an interlocking mosaic of grains with bent twin planes. Reference No. 781 Sample No. CCM6 381.65-382.05 Phlogopite, olivine, apatite sovite. Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda ries. Phlogopite forms anhedral grains with darker brown pleochroic rims. Some grains have bent (001) cleavages and kink bands. Olivine forms rounded large grains with incipient altera tion along rims, possibly serpentine. Magnetite forms anhedral disseminated grains. Apatite forms rounded, anhedral to subhedral grains. Carbonate forms an interlocking mosaic of grains with prominent bent twin planes. Reference No. 782 Sample No. CCM6 442.5-442.9 Magnetite, apatite, olivine, clinohumite sovite. Medium grained, massive, equigranular, massive, allotriomorphic, with curved to straight grain boundaries. Apatite is anhedral, rounded or subrounded in form. Olivine is anhedral, rounded in form, and generally fresh-looking with slight alteration along curved fractures. Olivine rarely poikilitically encloses apatite. Carbonate grains form an anhedral, interlocking mosaic. Mag netite forms ragged, anhedral disseminated clots that are randomly distributed. Reference No. 783 Sample No. CCM6 509.1-509.5 Phlogopite, clinohumite sovite. Medium grained, equigranular, massive, allotriomorphic, with curved to straight grain bounda ries. Phlogopite forms anhedral grains with very weakly developed, pleochroic brown rims. 32
R. P. SAGE Clinohumite is anhedral to subhedral in form. Carbonate forms an anhedral, interlocking mo saic of grains. Reference No. 784 Sample No. CCM6 545.1-545.5 Phlogopite, magnetite, apatite sovite. Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda ries. Phlogopite forms anhedral ragged grains with pleochroic rims that are darker brown than the cores. Apatite forms rounded anhedral grains. Magnetite forms anhedral disseminated grains. Reference No. 785 Sample No. C C M 9 401.8-402.2 Apatite rauhaugite. Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with lobate to ser rate grain boundaries. Apatite forms angular to subangular fragments set in a matrix of crushed carbonate. Apatite sometimes forms segmented crystals. Rounded porphyroclasts of carbonate are set in a matrix of crushed and recrystallized carbonate. Reference No. 786 Sample No. CCM9 409.95-410.6 Biotite, apatite rauhaugite. Fine to medium grained, inequigranular-seriate, allotriomorphic, with lobate to serrate grain boundaries. Apatite forms angular crystals and fragments of crystals. Apatite often forms seg mented crystals. Minor anhedral, reddish brown biotite has pronounced kinking of (001) cleav age. Rounded porphyroclasts of carbonate are set in a finer grained matrix of recrystallized carbonate. Reference No. 787 Sample No. CCM9 515.85-516.2 Apatite rauhaugite. Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with lobate to ser rate grain boundaries. Apatite forms rounded to angular grains which are often fractured and segmented. Rounded porphyroblasts of carbonate are set in a finer grained matrix of recrystal lized carbonate. Reference No. 788 Sample No. CCM20 162.2-162.65 Sovite. Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with lobate to ser rate grain boundaries. Carbonate forms an interlocking mosaic of anhedral grains; larger grains are set in a matrix of finer grained carbonate. It is unclear whether larger grains are porphyro clastic or porphyroblastic. Grain boundaries are lobate to serrate. One carbonate phase appears to replace the second. Finer grained carbonate interdigitates with coarser grained carbonate which is at least partially controlled by twinning in the carbonate. Reference No. 789 Sample No. CCM20 246.1-246.7 Sovite. Fine to medium grained, inequigranular-seriate, allotriomorphic, with serrate to lobate grain boundaries. Carbonate forms an interlocking mosaic of anhedral grains. Larger grains are set in a matrix of finer grained carbonate and have a weak elongation possibly defining a crude folia tion. Rock could be a recrystallized, deformed carbonatite. Reference No. 790 Sample No. CCM22 168.2-168.6 Apatite, magnetite, phlogopite sovite. Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with lobate grain boundaries. Apatite forms anhedral rounded bead-like grains. Magnetite forms anhedral dis seminated grains. Phlogopite forms irregular anhedral grains with pale brown cores and deep reddish brown rims. Mica is strongly zoned. Carbonate forms an interlocking mosaic of grains with lobate grain boundaries. Reference No. 791 Sample No. CCM23 391.25-391.7 Magnetite, phlogopite, apatite sovite. Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with curved grain boundaries. Phlogopite forms anhedral irregular grains with pale brown cores and deep reddish 33
Page 1 and 2: THESE TERMS GOVERN YOUR USE OF THIS
Page 3 and 4: Ontario Geology of Ministry of Mine
Page 5: Foreword The Cargill Township Carbo
Page 8 and 9: TABLES 1. Table Of Lithologic Units
Page 11 and 12: Geology of Carbonatite - Alkalic Ro
Page 13 and 14: Introduction The Cargill Township C
Page 15 and 16: R. P. SAGE Township and extends int
Page 17 and 18: General Geology The Cargill Townshi
Page 19 and 20: R. P. SAGE A crandallite-rich blank
Page 21 and 22: R. P. SAGE more euhedral when in co
Page 23 and 24: Other Mafic to Ultramafic Rocks R.
Page 25 and 26: R. P. SAGE p. 116) as a mixture of
Page 27 and 28: R. P. SAGE cores to magnesio-arfved
Page 29 and 30: R. P. SAGE mined thickness. Sandvik
Page 31 and 32: TABLE 2. STRATIGRAPHY OF OVERBURDEN
Page 33 and 34: R. P. SAGE containing approximately
Page 35 and 36: INTERNAL STRUCTURES R. P. SAGE The
Page 37 and 38: Economic Geology The Cargill Townsh
Page 39 and 40: R. P. SAGE Thoburn (1984) prepared
Page 41: Appendix A Petrographic Description
Page 45 and 46: R. P. SAGE with brown cores and red
Page 47 and 48: R. P. SAGE hedral grains disseminat
Page 49 and 50: R. P. SAGE pyroxene and occurs alon
Page 51 and 52: R. P. SAGE grains disseminated thro
Page 53 and 54: TABLE A-2. MAJOR ELEMENT ANALYSES (
Page 55 and 56: TABLE A-2. CONTINUED. Ref. No. SiO2
Page 57 and 58: TABLE A-2. CONTINUED. Ref. No. SiO2
Page 59 and 60: R. P. SAGE TABLE A-3. TRACE ELEMENT
Page 61 and 62: TABLE A-3. CONTINUED. Ref. No. Ag A
Page 71 and 72: TABLE A-4. CONTINUED. Ref. No. QZ C
Page 81 and 82: R.P. SAGE TABLE A-5. AVERAGE CHEMIC
Page 83 and 84: Appendix B — Electron Microprobe
Page 85 and 86: R.P. SAGE TABLE B-2. MICROPROBE MIN
Page 87 and 88: R. P. SAGE TABLE B-3. MICROPROBE MI
Page 89 and 90: TABLE B-5. MICROPROBE MINERAL ANALY
Page 91 and 92: R. P. SAGE TABLE B-6. MICROPROBE MI
Page 93 and 94:
R. P. SAGE TABLE B-7. MICROPROBE MI
Page 95 and 96:
R. P. SAGE TABLE B-9. MICROPROBE MI
Page 97 and 98:
References Allen, C. 1972: The Petr
Page 99 and 100:
Index Aeromagnetic data, 7, 21, 24
Page 101 and 102:
Kinking Biotite, Rauhaugite, 18 Phl
Page 103:
Chart A — Cargill Carbonatite Com
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