﻿Lindgren 
  — 
  Granodiorite 
  and 
  other 
  intermediate 
  rocJcs. 
  273 
  

  

  diorite 
  and, 
  more 
  rarely, 
  toward 
  granite, 
  may 
  be 
  found, 
  but 
  

   they 
  are 
  local 
  and 
  do 
  not 
  cover 
  large 
  areas, 
  while 
  the 
  normal 
  

   granodiorite 
  is 
  the 
  prevailing 
  rock 
  of 
  the 
  Sierras. 
  Comparing 
  

   the 
  type 
  here 
  described 
  with 
  the 
  granodiorites 
  of 
  the 
  many 
  

   smaller 
  areas 
  enclosed 
  in 
  the 
  slates 
  on 
  the 
  western 
  flank 
  of 
  the 
  

   range, 
  it 
  can 
  be 
  stated 
  that 
  the 
  latter 
  as 
  a 
  rule 
  approach 
  more 
  

   closely 
  to 
  the 
  quartz-diorites, 
  the 
  percentage 
  of 
  lime 
  being 
  

   higher 
  and 
  the 
  percentage 
  of 
  potash 
  more 
  often 
  smaller 
  than 
  

   equal 
  to 
  that 
  of 
  soda. 
  A 
  few 
  of 
  these 
  smaller 
  granitic 
  areas 
  

   could, 
  in 
  fact, 
  almost 
  as 
  well 
  be 
  indicated 
  as 
  quartz-mica- 
  

   diorites. 
  In 
  the 
  general 
  habit, 
  however, 
  in 
  the 
  percentage 
  of 
  

   quartz," 
  hornblende, 
  and 
  biotite, 
  and 
  in 
  the 
  constant 
  presence 
  of 
  

   titanite, 
  they 
  are 
  entirely 
  similar 
  to 
  the 
  granodiorites 
  of 
  the 
  

   High 
  Sierra. 
  Microcline, 
  not 
  common 
  in 
  the 
  granodiorites 
  of 
  

   the 
  foothill 
  region, 
  occurs 
  abundantly 
  in 
  those 
  of 
  the 
  High 
  

   Sierra. 
  

  

  A. 
  Table 
  of 
  Complete 
  Analyses. 
  

   Granodiorite. 
  

  

  Si0 
  2 
  .__ 
  

  

  T1O0 
  

  

  AI0O3 
  

  

  Fe 
  2 
  3 
  

  

  FeO 
  

  

  MnO 
  

  

  CaO. 
  

  

  SrO 
  

  

  BaO 
  

  

  MgO 
  

  

  KoO 
  

  

  Na 
  2 
  

  

  Li 
  2 
  

  

  H 
  2 
  below 
  100 
  C 
  C. 
  

   H 
  2 
  above 
  100°C. 
  

   P 
  2 
  5 
  

  

  

  

  

  

  

  

  I. 
  

  

  II. 
  

  

  III. 
  

  

  IV. 
  

  

  V. 
  

  

  YI. 
  

  

  65-54 
  

  

  66-65 
  

  

  63-85 
  

  

  67-45 
  

  

  66-40 
  

  

  59-48 
  

  

  •39 
  

  

  •38 
  

  

  •58 
  

  

  •58 
  

  

  

  •93 
  

  

  1652 
  

  

  16-15 
  

  

  15-84 
  

  

  15-51 
  

  

  17 
  13 
  

  

  1725 
  

  

  1-40 
  

  

  1-52 
  

  

  1-91 
  

  

  1-76 
  

  

  

  2-15 
  

  

  2-49 
  

  

  2-36 
  

  

  2-75 
  

  

  2-21 
  

  

  377 
  

  

  4-06 
  

  

  •06 
  

  

  •10 
  

  

  •07 
  

  

  

  

  

  •11 
  

  

  4-88 
  

  

  4-53 
  

  

  4-76 
  

  

  3-60 
  

  

  4-05 
  

  

  6-50 
  

  

  

  

  tr. 
  

  

  tr. 
  

  

  

  

  

  

  tr. 
  

  

  

  

  •07 
  

  

  •06 
  

  

  

  

  

  

  •09 
  

  

  2-52 
  

  

  1-74 
  

  

  207 
  

  

  1-10 
  

  

  •97 
  

  

  2-67 
  

  

  1-95 
  

  

  2 
  65 
  

  

  308 
  

  

  3-66 
  

  

  2-08 
  

  

  2-27 
  

  

  4-09 
  

  

  3-40 
  

  

  3-29 
  

  

  347 
  

  

  4-49 
  

  

  3.53 
  

  

  ... 
  . 
  

  

  tr. 
  

  

  tr. 
  

  

  

  

  

  tr. 
  

  

  

  

  •18 
  

  

  •28 
  

  

  •14 
  

  

  

  •09 
  

  

  •59 
  

  

  •72 
  

  

  1-65 
  

  

  '63 
  

  

  1-03 
  

  

  •71 
  

  

  •18 
  

  

  •10 
  

  

  •13 
  

  

  •12 
  

  

  .... 
  

  

  •33 
  

  

  10073 
  100-55 
  100-32 
  100-23 
  100*22 
  100-17 
  

  

  I. 
  Lincoln, 
  Placer 
  Co., 
  Sacramento 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

  

  II. 
  Nevada 
  City, 
  Nevada 
  Co., 
  Smartsville 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

  

  III. 
  Grass 
  Valley, 
  Nevada 
  Co., 
  Smartsville 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

  

  IV. 
  103 
  Pyr. 
  Pk., 
  Silver 
  Lake, 
  Pyramid 
  Pk. 
  Folio, 
  Geo. 
  Steiger 
  analyst. 
  

   V. 
  El 
  Capitan, 
  Yosemite, 
  CI. 
  King. 
  

  

  VI. 
  398 
  Placer 
  Co., 
  Conner 
  Pass, 
  Truckee 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

  

  The 
  following 
  of 
  the 
  rocks 
  in 
  table 
  B 
  belong 
  to 
  smaller 
  areas 
  

   enclosed 
  in 
  metainorphic 
  rocks 
  : 
  IV, 
  V, 
  VII, 
  VIII, 
  IX, 
  X. 
  The 
  

   following 
  numbers 
  represent 
  the 
  great 
  areas 
  in 
  the 
  higher 
  part 
  

   of 
  the 
  Sierra 
  Xevada 
  : 
  I, 
  II, 
  III, 
  VI, 
  XI, 
  XII, 
  XIII, 
  XIV, 
  XV, 
  

   XVI, 
  XVII. 
  

  

  