Geology Reference
In-Depth Information
Figure 7.6
Map showing the normally zoned Tuolumne Batholith, Sierra Nevada
USA. Facies types are: KC
=
Kuna Crest - hornblende-biotite granodiorite to
tonalite, eHD
biotite gran-
odiorite, pHD
=
porphyritic Half Dome
=
above plus K-feldspar megacrysts,
CP
=
equigranular Half Dome
=
large hornblende
+
biotite (only rarely hornblende) granodiorite to granite
with large K-feldpsar megacrysts, JP
=
Cathedral Peak
=
Johnson Granite porphyry. Isotopic age
dates (bold) that date emplacement of individual magma pulses give ranges from
circa 95 to 85Ma. (Courtesy Scott Paterson).
=