﻿l82 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  toward 
  the 
  basic 
  end 
  of 
  the 
  granites, 
  hence 
  it 
  is 
  not 
  surprising 
  

   that 
  shght 
  variations 
  toward 
  further 
  basicity 
  should 
  give 
  rise 
  to 
  

   rock 
  with 
  little 
  quartz, 
  like 
  that 
  south 
  of 
  Clayton 
  along 
  French 
  

   creek. 
  Except 
  for 
  this 
  the 
  petrographic 
  agreement 
  is 
  so 
  close 
  in 
  

   all 
  details 
  that 
  there 
  seems 
  no 
  question 
  as 
  to 
  the 
  identit}- 
  of 
  the 
  two 
  

   rocks. 
  

  

  Alexandria 
  syenite 
  

  

  In 
  the 
  previous 
  description 
  of 
  this 
  syenite 
  it 
  has 
  been 
  stated 
  

   that 
  an 
  augen 
  gneiss 
  adjoins 
  it 
  on 
  the 
  south 
  which 
  was 
  taken 
  by 
  

   us 
  in 
  the 
  field 
  for 
  a 
  gneissoid, 
  border 
  phase 
  of 
  the 
  rock, 
  but 
  that 
  

   Smyth 
  dissents 
  from 
  this 
  view. 
  In 
  the 
  field 
  this 
  border 
  rock 
  ap- 
  

   pears 
  much 
  the 
  more 
  basic 
  of 
  the 
  two, 
  but 
  closer 
  examination 
  

   shows 
  the 
  presence 
  of 
  much 
  quartz, 
  and 
  chemical 
  and 
  microscopic 
  

   investigation 
  shows 
  it 
  to 
  be 
  much 
  more 
  acid 
  than 
  the 
  syenite. 
  

   Analyses 
  of 
  each 
  follow, 
  with 
  two 
  analyses 
  of 
  the 
  general 
  Adiron- 
  

   dack 
  green 
  syenite, 
  thought 
  to 
  be 
  represented 
  in 
  this 
  district 
  by 
  the 
  

   Theresa 
  syenite, 
  (of 
  which 
  no 
  analyses 
  have 
  been 
  made) 
  for 
  pur- 
  

   pose 
  of 
  comparison 
  with 
  them. 
  

  

  Si02... 
  

  

  AI2O3.. 
  

   FeoOs.. 
  

   FeO... 
  

   M^O 
  . 
  . 
  

   CaO.. 
  . 
  

   Na20.. 
  

   K2O... 
  

   H2O 
  + 
  . 
  

   H2O— 
  . 
  

   TiOo. 
  . 
  

   P9O2. 
  . 
  

  

  CI 
  

  

  F 
  

  

  S 
  

  

  MnO 
  . 
  . 
  

   BaO... 
  

  

  58.99 
  

  

  19 
  . 
  22 
  

  

  2.83 
  

  

  2.83 
  

  

  1.25 
  

  

  3-41 
  

  

  4-33 
  

  

  5-64 
  

  

  •35 
  

  

  .04 
  

  

  .01 
  

  

  •59 
  

   . 
  10 
  

   .40 
  

   .08 
  

   .14 
  

   .09 
  

  

  59-70 
  

  

  19-52 
  

  

  1.89 
  

  

  4.92 
  

  

  3-36 
  

   5-31 
  

   4.14 
  

  

  63-45 
  

  

  18.38 
  

  

  1 
  .09 
  

  

  2 
  .69 
  

  

  •35 
  

  

  3.06 
  

  

  5.06 
  

  

  5-15 
  

  

  •30 
  

  

  .07 
  

  

  trace 
  

  

  66. 
  50 
  

   1^.66 
  

  

  21 
  

   18 
  

   15 
  

   74 
  

   02 
  

   40 
  

   05 
  

   71 
  

   59 
  

   06 
  

  

  05 
  

   18 
  

  

  03 
  

  

  05 
  

  

  66.59 
  

  

  14.54 
  

  

  2 
  .42 
  

  

  2.43 
  

   1. 
  18 
  

  

  2-15 
  

  

  3.08 
  

  

  5.62 
  

  

  .46 
  

  

  .40 
  

  

  •03 
  

   .06 
  

   .08 
  

   •23 
  

  

  ■17 
  

  

  100 
  .23 
  

  

  99.60 
  100.33 
  

  

  1 
  Alexandria 
  syenite, 
  35^2 
  miles 
  north 
  of 
  Redwood 
  (8K2, 
  Alexandria 
  

   sheet). 
  E. 
  W. 
  Morley, 
  analyst. 
  

  

  2 
  Tupper 
  syenite 
  (laurvikose), 
  N". 
  Y. 
  State 
  Mus. 
  Bui. 
  115, 
  p. 
  514. 
  

  

  3 
  Loon 
  Lake 
  syenite 
  (pulaskose), 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  115, 
  p. 
  514. 
  

  

  4 
  Augen 
  gneiss 
  associated 
  with 
  Alexandria 
  syenite, 
  2 
  miles 
  west 
  of 
  north 
  

   of 
  Redwood 
  (6J2, 
  Alexandria 
  sheet), 
  E. 
  W. 
  Morley, 
  analyst. 
  

  

  5 
  Picton 
  granite, 
  repeated 
  from 
  previous 
  column 
  of 
  analyses. 
  

  

  