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

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CARBONATITE - ALKALIC ROCK COMPLEXES: CARGILL TOWNSHIP brown rims. Magnetite forms anhedral disseminated grains, some of which are skeletal. Car bonate forms anhedral grains interlocking with each other and amphibole. Amphibole forms elongated grains pleochroic from pale green to dark green. There are some crude amphibole cross sections. Extinction angle is high and amphibole is likely a sodic variety. Some amphi- boles are crudely euhedral, others somewhat ragged and nearly anhedral. Reference No. 819 Sample No. CCM35 100.5-101.0 Magnetite-rich pyroxenite. Finegrained, massive, equigranular, allotriomorphic, with curved grain boundaries. Minor am phibole forms brown anhedral interstitial grains. Magnetite forms anhedral, irregular interstitial grains. Clinopyroxene forms anhedral colourless grains, commonly twinned. Pyroxene forms an interlocking mosaic with magnetite. Clinopyroxene extinction angles are typical of augite. Reference No. 820 Sample No. CCM41 248.35-248.7 Phlogopite, magnetite, apatite sovite. Fine to medium grained, massive, inequigranular-seriate, allotriomorphic, with curved to lobate grain boundaries. Magnetite forms anhedral disseminated grains. Trace of magnetite is skeletal in form. Phlogopite forms anhedral irregular booklets; grains have light brown cores and dark reddish brown rims. Apatite forms rounded anhedral to subhedral grains. Larger grains tend to be elongate in form. Carbonate forms an interlocking mosaic of anhedral grains with curved to lobate grain boundaries. Reference No. 821 Sample No. CCM41 140.0-140.6 Amphibole, apatite, magnetite, phlogopite sovite. Fine to medium grained, inequigranular-seriate, hypidiomorphic. Amphibole forms acicular, euhedral, pale green to green grains. Amphibole is somewhat clotty. Magnetite forms dissemi nated grains. Phlogopite forms anhedral grains, locally with bent (001) cleavage and wavey extinction. Grains have pale brown cores and reddish brown rims and are thus zoned. Apatite forms anhedral rounded grains, larger grains are elongate in outline. Carbonate forms an inter locking mosaic of anhedral grains with curved to lobate grain boundaries. Possibly recrystal- lized. Reference No. 822 Sample No. CCM46 225.75-226.3 Olivine, amphibole clinopyroxenite. Fine to medium grained, massive, inequigranular-seriate, hypidiomorphic. Olivine forms an hedral grains occurring as percrystalline aggregates interstitial to pyroxene and altered to ser pentine and bowlingite. Magnetite forms anhedral grains interstitial to pyroxene. Amphibole forms patchy replacements of pyroxene and is present along pyroxene grain boundaries. Green to greenish brown amphibole commonly rims magnetite. Clinopyroxene forms anhedral to sub hedral, colourless grains, commonly with schiller texture. Reference No. 823 Sample No. CCM46 223.3-223.7 Olivine, amphibole clinopyroxenite. Fine to medium grained, massive, inequigranular-seriate, hypidiomorphic. Magnetite forms an hedral disseminated grains, interstitial to pyroxene. Olivine forms anhedral grains, which con sist of aggregates interstitial to pyroxene. Olivine is extensively altered to serpentine and bowlin gite. Amphibole is brown to greenish brown in colour and occurs as a patchy alteration of pyroxene, along grain boundaries of pyroxene, and as narrow rims on magnetite grains. Clinopyroxene forms anhedral to subhedral, colourless grains; some grains display well devel oped schiller texture. Reference No. 824 Sample No. CCM46 191.35-191.9 Olivine, amphibole clinopyroxenite. Fine to medium grained, inequigranular-seriate, hypidiomorphic. Magnetite forms anhedral ir regular grains, partially interstitial to pyroxene. Olivine forms anhedral grains and occurs as percrystalline aggregates interstitial to the pyroxene and may enclose isolated pyroxene grains; there is minor alteration to serpentine and bowlingite. Amphibole forms patchy alterations of 38
R. P. SAGE pyroxene and occurs along grain boundaries of pyroxene. Amphibole also rims portions of some magnetite crystals. Clinopyroxene is anhedral to subhedral in form, colourless, and has well developed schiller texture. Pyroxene has the extinction angle of augite. Reference No. 825 Sample No. CCM46 186.0-186.65 Olivine, amphibole clinopyroxenite. Fine to medium grained, inequigranular-seriate, massive, hypidiomorphic. Olivine forms aggre gates of anhedral grains enclosed in pyroxene. One olivine grain encloses a pyroxene grain. Olivine is locally altered to bowlingite along edges; minor serpentine occurs along fractures. Magnetite forms anhedral disseminated grains. Amphibole is pale green to brown, forming spotty replacement of pyroxene, and occurs along pyroxene grain boundaries. Amphibole fills small capillary fractures. Amphibole is common along edges of magnetite grains. Clinopyroxene forms anhedral to subhedral, colourless crystals; schiller structure is essentially absent. Pyroxene has the extinction angle of diopside. Reference No. 826 Sample No. CCM46 156.45-156.85 Olivine, amphibole clinopyroxenite. Fine to medium grained, massive, inequigranular-seriate, hypidiomorphic. Olivine forms an hedral grains in part altered to greenish bowlingite and serpentine. Olivine is interstitial to pyroxene and consists of percrystalline aggregates. Magnetite forms irregular disseminated grains. Amphibole is pale brown to green, forming patchy alteration of the pyroxene and along margins of pyroxene grains. Amphibole appears to occupy a small fracture traversing the sec tion. Clinopyroxene is anhedral to subhedral in form. Pyroxene is colourless and displays well developed schiller texture. Extinction angle is that of diopside. Reference No. 827 Sample No. CCM46 150.9-151.4 Olivine, amphibole clinopyroxenite. Fine to medium grained, massive, inequigranular-seriate, hypidiomorphic. Olivine forms an hedral grains interstitial to pyroxene. Olivine is altered to serpentine and magnetite along frac tures, and to iddingsite on some edges. Magnetite forms anhedral disseminated grains. Minor disseminated pyrrhotite is present. Amphibole forms as a patchy alteration of pyroxene and along margins of some pyroxene grains. Amphibole is also common along margins of some magnetite grains. Clinopyroxene is anhedral to subhedral, colourless, and displays well devel oped schiller texture. Pyroxene has the extinction angle of diopside. Reference No. 828 Sample No. CCM46 145.15-145.65 Amphibole, olivine clinopyroxenite. Fine to coarse grained, massive, inequigranular-seriate, hypidiomorphic. Olivine forms an hedral grains interstitial to pyroxene. Olivine is altered to iddingsite and serpentine. Magnetite forms anhedral disseminated grains. Amphibole forms as irregular patches in pyroxene grains and along margins of pyroxene grains. Amphibole is common along margins of most magnetite grains. Minor disseminated pyrrhotite is present. Clinopyroxene is colourless, subhedral to an hedral in form and displays well developed schiller texture. Pyroxene has the extinction angle of diopside. Reference No. 829 Sample No. CCM47 70.25-70.7 Amphibole pyroxenite. Fine to medium grained, massive, inequigranular-seriate, hypidiomorphic. Magnetite forms an hedral irregular grains. Magnetite completely encloses some pyroxene grains. Amphibole is brown to greenish brown and forms as patchy replacements of pyroxene, along margins of pyroxene grains, and along margins of magnetite grains. Pyroxene forms colourless anhedral to subhedral grains. Some grains have a schiller texture. Trace of olivine is completely altered to reddish brown iddingsite. Reference No. 830 Sample No. CCM47 47.0-47.5 Amphibole clinopyroxenite. Fine to medium grained, inequigranular-seriate, massive, hypidiomorphic. Magnetite forms an hedral, irregular, disseminated grains interstitial to pyroxene. Several pyroxene grains contain 39
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 and 42: Appendix A Petrographic Description
Page 43 and 44: R. P. SAGE Clinohumite is anhedral
Page 45 and 46: R. P. SAGE with brown cores and red
Page 47: R. P. SAGE hedral grains disseminat
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 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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