Experimental studies demonstrating metasomatic processes and their
application to natural granitic environments.
experimental evidence for K-replacements of plagioclase and origin of
microcline in granite plutons.
of a magmatic tonalite to produce a megacrystal granodiorite by
K-metasomatism, Monterey peninsula and northern Santa Lucia
Mountains, California, USA.
errors that can result when myrmekite and geologic evidence are
layered diorite-gabbro to become a layered quartz
in the Wanup pluton near Sudbury, Canada.
of plagioclase to produce microcline megacrysts in the Cathedral Peak
granodiorite, Sierra Nevada, California, USA. This article is co-authored with Barbara J. Collins.
42. A study of
intergrowth textures and their possible origin in the Alvand plutonic
complex, Hamadan, Iran. This article is co-authored with Ali A. Sepahi.
Myrmekite formation at Temecula, California, revisited: A
photomicrographic essay illustrating replacement textures.
K-metasomatism and the origin of Ba- and inclusion-zoned orthoclase
megacrysts in the Papoose Flat pluton, Inyo Mountains, California, USA.
This article is co-authored with Barbara J. Collins.
formed by Na- and Ca-metasomatism of K-feldspar. This article
by Rong Jiashu provides a different model for a metasomatic origin of myrmekite.
metasomatic K-feldspathization. This article by Rong Jiashu provides a new model for K-metasomatism.
conditions affecting porosity in granite, and negative effects of K-
and Si-metasomatism on the trapping of oil in layered Precambrian quartz
diorite-gabbro sills penetrated by the AOC Granite 7-32-89-10 drill
hole near Fort McMurray, Alberta, Canada.
from magmatic to K-metasomatic processes in granodiorites and Pyramid
Peak granite, Fallen Leaf Lake 15-Minute Quadrangle, California, USA.
possible unsuspected significance of isotopic Rb-Sr "errorchrons." This article is co-authored with Barbara J. Collins.
tectonics, the segmented Laramide Slab, deformation, and large scale K-
and Si-metasomatism. This article is co-authored with Barbara J. Collins.
and mafic magma commingling accompanied by Ca-metasomatism of
xenocrysts, followed by K-metasomatism of solidified felsic tonalite to
form quartz monzonite and granite in the Chief Lake granitic complex
south of Sudbury, Ontario, Canada.
new kind of "evolved" granitic plutonic rock
that is formed where K and Si are mobilized. This article is co-authored with Barbara J. Collins.
53. K- and Si-metasomatism created K-feldspar megacrystic granite in the outer shell of the Vraadal pluton, Telemark, southern Norway (Slide Presentation). This presentation is co-authored with Arthur Sylvester.
54. Abstract: K- and Si-metasomatism created K-feldspar megacrystic granite in the outer shell of the Vraadal pluton, Telemark, southern Norway. This abstract is co-authored with Arthur Sylvester.
55. Two patterns of monomineral replacement in granites. This article by Rong Jiashu presents new evidence and new models beyond what he proposed in articles #45 and #46.
56. Origin of myrmekite as it relates to K-, Na-, and Ca-metasomatism and the metasomatic origin of some granite masses where myrmekite occurs.
In order to make the numerous articles in this web
site more useful to students and other granite investigators, I invite
viewers to submit
comments for inclusion in "comment and reply" sections.
Many researchers have extensive knowledge of the geologic areas
in these articles and can offer observations, alternative models,
references, and data that could contribute valuable information. I will
make a concerted effort (although reserving editorial rights) to add
material that is helpful and not necessarily that which supports only
view point. For example, my question at the end of web-site article
number 3, imagining that silanes might be a source of Si for the
of metasomatic granites, has been strongly criticized. I have been
persuaded from thermodynamic arguments that my speculation about
is wrong. Silanes are so extremely reactive in the presence of water
if they exist deep in the mantle and are moving upward in the earth's
crust, they likely are destroyed long before they reach regions in the
crust where granites are formed. Also, article number 4 has alternative
models for Ca-, Na-, and K-metasomatism presented by other
investigators. So, please send your "Comments" by email to:
For more information contact Lorence Collins at:
Dr. Lorence G. Collins
This page has been accessed since March 26, 1996
Department of Geological Sciences
California State University Northridge
18111 Nordhoff Street
Northridge, California 91330-8266