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STRUCTURE,	  CONSTRUCTION,	  AND	  EMPLACEMENT	  OF	  THE	  YOSEMITE	  VALLEY INTRUSIVE	  SUITE	  AND	  THE	  YOSEMITE	  CREEK	  GRANODIORITE	  IN	  THE	  CENTRAL	  SIERRA NEVADA	  BATHOLITH By	  Brendon	  Johnson The	  103-­‐98	  Ma	  El	  Capitan	  and	  Taft	  granites	  and	  the	  ~97	  Ma	  Yosemite	  Creek Granodiorite	  intrude	  plutonic	  and	  metasedimentary	  rocks	  in	  the	  central	  Sierra	  Nevada batholith.	  	  The	  El	  Capitan	  Granite	  and	  Yosemite	  Creek	  Granodiorite	  are	  divided	  in	  this study	  into	  several	  texturally	  and	  compositionally	  distinct	  units,	  whereas	  the	  Taft	  Granite is	  relatively	  homogeneous.	  	  Injection	  of	  a	  few	  large	  increments	  of	  magma	  or	  many increments	  intruded	  close	  in	  time	  probably	  formed	  small	  (2	  km)	  to	  large	  (≥20	  km	  for Taft	  Granite)	  chambers	  in	  the	  Yosemite	  Valley	  Suite	  and	  parts	  of	  the	  Yosemite	  Creek Granodiorite.	  	  Units	  of	  the	  Yosemite	  Creek	  Granodiorite	  that	  intruded	  as	  steep,	  narrow sheets	  probably	  solidified	  shortly	  after	  intrusion.	  	  Emplacement	  of	  Yosemite	  Creek magmas	  was	  facilitated	  by	  wedging	  aside	  of	  host	  rock,	  stoping,	  and	  possibly	  ductile flow.	  	  The	  plutons	  have	  steep,	  dominantly	  NE-­‐striking	  magmatic	  foliations,	  some	  of which	  are	  discordant	  to	  contacts	  and	  record	  regional	  strain	  that	  contrasts	  with	  the regional	  strain	  field	  interpreted	  from	  plate	  kinematics.	  	  The	  major	  Mt.	  Hoffman	  shear zone	  comprises	  thousands	  of	  narrow	  (meter-­‐scale)	  NE-­‐striking,	  reverse-­‐slip	  ductile	  shear zones	  that	  deformed	  the	  eastern	  part	  of	  the	  El	  Capitan	  Granite	  prior	  to	  intrusion	  of	  the Taft	  Granite.	  	  Other	  sizable	  solid-­‐state	  shear	  zones	  of	  this	  age	  in	  the	  region	  strike	  NW, and	  thus	  the	  regional	  strain	  field	  was	  likely	  heterogeneous	  from	  103-­‐98	  Ma.

Structure, Construction, and Emplacement of the Yosemite Valley Intrusive Suite and the Yosemite Creek Granodiorite in the Central Sierra Nevada Batholith