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

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CARBONATITE - ALKALIC ROCK COMPLEXES: CARGILL TOWNSHIP suiting from the reaction of alkali-rich aqueous fluids from the carbonatite magma with the surrounding pyroxenite. This process is analogous to fenitization and has been described in detail by Gittins et al. (1975). Drilling by Sherritt Gordon Mines Limited in 1985 to test for vermiculite indicated that the existing vermiculite is a product of weathering and is a near-surface feature lacking in vertical extent. The work of Sheritt Gordon Mines Limited has diminished con siderably the vermiculite potential of the Cargill Township Carbonatite Complex. 30
Appendix A Petrographic Descriptions, Chemical Analyses, Normative Compositions, and Statistical Compositions of Lithologic Units of the Cargill Township Carbonatite Complex. TABLE A-l. PETROGRAPHIC DESCRIPTIONS OF WHOLE-ROCK SAMPLES* FROM THE CARGILL TOWNSHIP COMPLEX. Reference No. 771 Sample No. CCM6 102.9-103.3 Silicocarbonatite. Fine to medium grained, equigranular, allotriomorphic, with curved to ragged grain boundaries. Sample has undergone deformation. Apatite forms rounded anhedral grains. Magnetite forms anhedral disseminated grains. Phlogopite forms an anhedral, interlocking mosaic with pervasive and strong kinking of (001) cleavage. Carbonate forms rounded, composite, interstitial grains. Reference No. 772 Sample No. CCM6 131.8-132.2 Silicocarbonatite. Fine to medium grained, equigranular, massive, allotriomorphic with curved to straight grain boundaries. Magnetite forms anhedral disseminated grains. Apatite forms rounded to sub rounded grains. Amphibole occurs as somewhat acicular, anhedral, irregular grains forming an interlocking mosaic. Carbonate forms an interlocking mosaic of anhedral grains. Reference No. 773 Sample No. CCM6 140.0-140.4 Silicocarbonatite. Fine to medium grained, massive, equigranular, hypidiomorphic. Magnetite is anhedral and disseminated throughout. Amphibole forms subhedral to euhedral acicular grains. Phlogopite forms anhedral to subhedral grains in an interlocking mosaic. Carbonate forms anhedral inter stitial grains. Reference No. 774 Sample No. CCM6 141.4-141.65 Apatite, magnetite, amphibole, phlogopite Silicocarbonatite. Medium grained, equigranular, massive, allotriomorphic, with curved to straight grain bounda ries. Magnetite forms anhedral disseminated grains. Phlogopite forms anhedral grains with darker brown pleochroic rims. Amphibole is somewhat acicular with very pale pleochroism and weak zoning of larger grains under crossed nicols. Apatite forms rounded anhedral grains. Car bonate forms an interlocking mosaic of anhedral grains. Reference No. 775 Sample No. CCM6 151.3-151.65 Apatite, magnetite, amphibole, phlogopite sovite. Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda ries. Amphibole is weakly pleochroic, acicular, rarely poikilitically encloses carbonate, and un der crossed nicols birefringence suggests zoning. Magnetite is anhedral and disseminated. Phlogopite forms anhedral grains with dark brown pleochroic rims. Minor apatite occurs as rounded anhedral grains. Reference No. 776 Sample No. CCM6 243.9-244.25 Magnetite, phlogopite, apatite sovite. Medium grained, massive, equigranular, allotriomorphic, with curved to straight grain bounda ries. Phlogopite forms anhedral grains with dark brown pleochroic rims. In some grains there is *All samples are from drill core. The locations of the drillholes are shown on Figure 3 (Chart A). 31
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: R. P. SAGE Thoburn (1984) prepared
Page 43 and 44: R. P. SAGE Clinohumite is anhedral
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:
Page 95 and 96:
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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