GEOLOGY AND LITHOGEOCHEMISTRY OF THE CHILKO-TASEKO LAKES AREA* BY G.

Transcription

1 B Ministry of Energy, Mines and Petroleum Resources GEOLOGICAL BRANCH MINERAL RESOURCES DIVISION NOTES TO ACCOMPANY OPEN FILE - GEOLOGY AND LITHOGEOCHEMISTRY OF THE CHILKO-TASEKO LAKES AREA* BY G. P. McLAREN THIS MAP 1 A CONTRIBUTtON tdwe C AfJ ADA/ E. R it i El CO L U M Bi A M JEfRAL UEVELOPM UJT AGREEMENIE. *This project is a contribution to the Canada-British Columbia Mineral Development Agreement. victor i a Br i ti sh Columbi a January

2 1. Sample Descr i pt ions Geology and Li.thogeochemistry of the Chi.lko-Taseko Lakes Area Open File No. - British Columbia Ministry of Energy, M.i nes and Petroleum Resources LITHOGEOCHEMISTRY Sample No. R M 1 RM2 RM RM RM - RM RM RM RM RM 1 RM 1- RM 1 RM 1 RM 1 RM RM RM RM 2 RM 2 RM 2- RM RM RM FW - RM 0 RM 1- RM Descr i.pt ion bleached, sericitic shear zone; quartz veined; % pyrite; cuts andesitic volcanic quartz-carbonate alteration zone adjacent to felsi te intrusive; 2-% pyrite carbonate veinlets carrying malachite, bornite, chalcopyrite cutting andesite strongly bleached and pyritic shear zone cutting andesites dacite; weakly silicified; pyrite and pyrrhotite shear zone; strong clay-sericite alteration; pyr i te black siliceous argillite; pyritic silicified, andesitic tuff; pyritic border of felsic dyke; pyritic shear zone cutting andesitic fragmentals; pyritic dacite; weakly silicified; pyrite and pyr rhot i te cherty argillite; pyrite and pyrrhotite quartz-carbonate vein float; -% pyrite pyritic dacite clay altered diorite; fractured; veined silicified limonitic shear zone silicified argillite no sample silicified meta-volcanic; pyrite gossanous, silicified fractures cutting volcanics; pyrite, pyrrhotite gossanous zone in dioritic intrusive rusty hornfelsed volcanics silicified, veined diorite; chalcopyrite, malachite, azur i te, pyrite rusty, veined intrusive; pyrite, pyrrhotite, chalcopyr i te carbonate nodules in black argillite; chalcopyrite, malachite, pyrite rusty, fractured andesite; pyrite quartz veinlet in andesite; pyrite, trace chalcopyrite

3 RM - RM RM - RM 0 RM 1-2 RM - RM 0-1 RM 2- RM RM RM RM RM RM RM 0 RM 1-2 RM - RM RM RM - RM -0 RM 1 RM 2 RM RM RM - m RM RM -1 RM 2 RB 1 RB 2 RB - RB - RB - RB - - dacitic volcanic, silicified; pyrite up to % - limonitic shear zone; minor pyrite - hornfelsed volcanics; pyrite - fractured, silicified volcanic; pyrite up to % limonitic tufe horizon; pyrite up to % - prominent gossan in fractured, siliceous volcanic tuffs; rhyolitic (?); pyrite and pyrrhoti te 2-% carbonate-quartz alteration zone in andesite - limonitic quartz-eye tuffs; pyrite, pyrrhotite - hornfels/felsite contact - limonitic andesite; pyrite - silicified, limonitic, volcanic breccia; pyrite silici.fied, veined andesite float; malachite - silicified, veined volcanic breccia; minor pyr i te - limonitic silicified tuff; fine pyrite up to % - limonitic siliceous tuff; pyrite -% - rusty andesitic volcanics - fault breccia; silicified, quartz and carbonate veins; pyrite - skarn pocket at contact of dyke and calcareous volcanics; garnet, hematite, pyrite, trace chalcopyrite - silicified volcanics; pyrite, trace chalcopyr i te - limonitic, altered diorite; pyrite, pyrrhotite - ve i ned hornf elsed volcanics ; pyr i te, chalcopyrite, pyrrhotite, malachite - diorite intrusive; veined; pyrite, chalcopyrite, pyrrhotite - quartz veinlets with malachite - hornfelsed volcanics; pyrite - limonitic quartz veined diorite; pyrite, chalcopyrite, malachite - hornfelsed, gossanous, volcanics; pyrite, pyrrhotite - quartz veinlets in volcanics - hornfelsed volcanics - djorite contact; veined; pyrite, pyrrhotite, minor chalcopyrite limonitic quartz veins with pyritic boxwork - strongly silicified footwall to quartz vein - hornfels-felsite zone; minor pyrite - hornfelsed greywacke; veined; pyrite, trace chalcopyr i te veined, sheared tuff; minor pyrite - silicified, fractured tuff; limonitic fault zone; pyrite, minor malachite - silicified tuffs in fault zone; pyrite - limonitic, hornfelsed volcanic; pyrite

4 RB RB 1-1 RB 1 RB RB 1 RB 1 RB 1 RB RB - RB 2 RB 2 RB 2 RB 2-2 RB 2 RB 0-1 RB 2 - calcareous concretions in argillaceous limestone; pyrite - sheared, siliceous felsic tuff; pyrite - float of quartz-carbonate veined volcanic; veinlets and pods of galena, sphalerite, pyr i te, chalcopyr i te - sheared, siliceous felsic tuff; pyrite - limonitic, altered, granodiorite; pyrite, m i nor chalcopyr i te - carbonate altered felsite; pyrite 2% - quartz-carbonate alteration in tuffs - quartz-carbonate veined dyke; pyrite - quartz-carbonate alteration in tuffs; % pyr i te - fractured granodiorite; 1% pyrite - hornfelsed argillite; pyrite - carbonate alteration zone - limonitic, silicified granodiorite; 2% pyr i te, minor chalcopyr j te - hornfelsed, veined, andesite; pyrite, minor chalcopyr i te - limonitic quartz vein; pyrite boxwork - quartz-carbonate altered felsite; 2% pyrite, minor chalcopyrite in fractures RF 1 RF 2 RF RF RF RF RF RF limonitic mafic volcanic; pyrite - sheared andesitic volcanic; quartz-calcite veinlets carry pyrite, trace malachite - limonitic granodiorite; pyrite - limonitic carbonate veined intrusive - limonitic tuffs; carbonate veins; pyrite - limonitic andesite; pyrite - limonitic quartz-feldspar-porphyry dyke; pyr i te - quartz-carbonate veined dyke; pyrite A complete geological description is given in: McLaren, G.P. (): Geology and Mineral Potential of the Chilko-Taseko Lakes Area, B.C. Ministry of Energy, Mines and Petroleum Resources, Geological Fieldwork 1, Paper -1.

5 2. Analytical Data Sample No. Ag cu* Pb* Zn* co Ni Mo PP* Mn* Cd Fe % Hg** PPb As Sb RM1 RM2 RM RM RM FW RM RM RM RM RM RM RM 1 RM 1 RM 1 RM RM 1 RM 1 RM 1 RM RM RM RM 2 RM 2 RM 2 RM 2 RM 2 RM 2 RM 0 RM 1 RM 2 RM RM RM RM RM RM RM RM ( ( (0. 0 ( ( (0. ( ( ( <I ( a ia ( ( ( ( ( ( ( ( ( ( ( ( ( ( <l@

6 Pb* Zn* P P co Ni Mo Mn* Cd Fe Hg** PPb As Sb RM 1 RM 2 RM RM RM RM RM RM RM RM 0 RM 1 RM 2 RM RM RM RM RM RM RM RM 0 RM 1 RM 2 RM RM RM RM RM RM RM RM 0 RM 1 RM 2 RM RM RM RM RM RM RM RM 0 ( (0. 0 (0. ( ( (

7 Sample No. A cu* Pb* Zn* co Ni Mo Mn* Cd Fe % Hg** PPb As Sb RM 1 RM 2 RM RM RM RM RM RM RM RM 0 RM 1 RM 2 RB 1 RB 2 RB RB RB RB RB RB RB RB RE RB RB 1 RB 1 RB 1 RB RE 1 RB 1 RB 1 RB RB RB RB 2 RB 2 RB 2 RB 2 RB 2 RB ( <O. 1 2 <O. <O. <O. ( > ( <lo <I0

8 SanQle No. Ay Cu* Pb* Zn* Co Ni Mo Mn* Cd Fe Hg** As Sb PP'n % PPb RB 2 RB 0 RB 1 RB 2 RF 1 RF 2 RF RF RF RF RF RF <@. ( All gold analyses returned ppm except for RM 2. ppm RM 0.2 ppm RB 1 U. ppm 2. All bismuth analyses returned < ppm except for RM 1 RM 0 1 RB 1. * Copper, lead, zinc, manganese or cadmium values with a decimal point are in per cent. ** Mercury values with a decimal point are in ppm.. Anaiyt i.cal Methods a) Cu, Pb, Zn, Co, Ni, Mo, Mn, Cd, Fe, Bi, As, Sb Total acid digestion with atomic absorption analysis. b) Au, Ag Fire assay; Ag checked as in (a). c) Hg Cold vapour atomic absorption.