The chemistry, mineralogy, and petrology of the George Ashley Block pegmatite body

The George Ashley Block (GAB) is a rockslide block located in the Pala pegmatite district of Southern California. It is layered, asymmetric, pocket containing, and peraluminous. The GAB consists of quartz (42 vol%), Na-rich plagioclase (27%), potassium feldspar (24%), muscovite (7%), Mn-rich garnet...

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Bibliographic Details
Published in:The American mineralogist 1999-06, Vol.84 (5-6), p.695-707
Main Authors: Kleck, Wallace D, Foord, Eugene E
Format: Article
Language:English
Subjects:
biotite
California
Chemical elements
crystallization
electron probe data
garnet group
George Ashley Block
granites
Heriot Mountain
igneous and metamorphic rocks
igneous rocks
magmas
mica group
mineral composition
Mineralogy
Minerals
muscovite
nesosilicates
orthosilicates
oxides
Pala pegmatite district
pegmatite
Petrology
plutonic rocks
polished sections
Rockslides
sample preparation
sheet silicates
silicates
Southern California
Southern California Batholith
spectra
Stone
thin sections
trace elements
United States
X-ray fluorescence spectra
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Description
Summary:The George Ashley Block (GAB) is a rockslide block located in the Pala pegmatite district of Southern California. It is layered, asymmetric, pocket containing, and peraluminous. The GAB consists of quartz (42 vol%), Na-rich plagioclase (27%), potassium feldspar (24%), muscovite (7%), Mn-rich garnet (2%), biotite (1%), and a trace of tourmaline and gahnite. It contains only small amounts of the incompatible elements that characterize differentiated pegmatite bodies. P2O5, MnO, and F are present in amounts of
ISSN:0003-004X
1945-3027
DOI:10.2138/am-1999-5-601