On differences in chemical composition between the central and marginal zones of granite veins : with further evidence of exchanges between such veins and the contact rocks / by William Mackie.

  • Mackie, William.
Date:
[1900]
Catalogue details

Licence: In copyright

Credit: On differences in chemical composition between the central and marginal zones of granite veins : with further evidence of exchanges between such veins and the contact rocks / by William Mackie. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    19/27 (page 111)
    I think, it is possible that differences'in the direction of move- ment of the same base, such as would seem to be indicated by some of the results, may have taken place at different phases of the evolution. Series ^.—GRANITE VEINS (Margins). Veins Silica SiOj Alum- ina A'jO, Fenic Oxide FejO, Mangan- ous Oxide MnO Lime CaO Mag- nesia MgO Potash K,0 Soda NajO Loss on Igni- tion HsO, etc. Totals (a) . - 74-30 13-44 2-72 Trace -89 -27 3-99 4-14 •49 100-24 (6) . . 74-96 12-27 1-96 1-02 -20 -20 3-60 5-51 •35 100-09 (c) . . 72-47 14-72 -93 Trace 1-10 -13 5-04 5-02 •72 100-13 (rf) . . 72-81 14-36 -28 Absent -36 •17 3-66 7-95 •31 99-90 (e) . . 73-00 14-29 2-27 -58 -52 •15 3-95 4-99 •43 100-18 Averages 73-51 13-82 1-63 -40 -62 •18 4-05 5-52 •46 ... Series ^.—GRANITE VEINS (Centres). (a) . . 76-82 10-58 3-14 1-28 -78 •18 2-71 4-05 •37 99-91 (6) . . 73-70 12-45 2-20 1-01 -70 •16 3-34 5-62 •57 99-75 (c) . . 74-03 11-63 2-07 1-62 1-21 •24 3-34 4-93 •84 99-91 (d) . . 74-88 13-50 1-13 1-59 -85 •16 •99 6-76 •34 100-20 (e) . . 74-22 15-18 1-25 -75 1-11 •18 1-83 4-90 •66 100-08 Averages 74'73 12-67 1-96 1-25 -93 •18 2-44 5-25 •56 ... Series A.—CONTACT ROCKS (Quartz Schists). Proximal Specimens. In Relation to Vein Distance from Vein Margin SiO, AljO, Fe-0, MnO CaO MgO KjO Na,0 Loss on Ignition Totals j (a) No S peci mens obta ined. (61 . . 1 ft. 86-64 7-33 1-98 •34 •37 •16 1-69 1-12 •49 100-12 \c] . . 1 in. 75-25 10-01 5-01 •46 1-38 •65 2-78 3-61 •77 100-11 (d) . . 3 in. 74-01 11-86 5-19 •53 1-49 •54 2-32 3-13 1-02 100-09 (e) . . 4 ft. 72-10 13-76 4-02 •40 1-82 •67 4-06 1-93 1-54 100-20 Averages 16 in. 77- 10-74 4-05 •43 1-27 •48 2-71 2-45 •96 Distal Specimens. (a) . . No Spe cime ns. (6) . . 2 ft. 81-11 9-38 3-98 •26 1-09 •86 •96 1-86 •59 100-09 (c) . , 2 ft. 84-67 7-86 2-20 •28 2-29 •05 •25 1-99 •48 100-07 d) . . 4 ft. 82-18 6-61 3-67 •64 1-69 •43 1-66 2-34 •90 100-12 (e) . . 20 ft. 76-60 11-83 4-14 lost •76 •36 2-70 2-48 1-11 99-88 Averages 9 ft. 81-12 8-92 3-60 •39 1-46 •43 1-39 2-17 •77 ...