MYRMEKITE AND METASOMATIC GRANITE, ISSN 1526-5757
Lorence G. Collins email: lorencec@sysmatrix.net
If you are interested, the following link connects
to a picture of
myself and contains a short biography.
There are fifty presentations in this web site
which are connected by links. Each presentation should be listed in
reference lists of articles in refereed journals and graduate theses
showing ISSN 1526-5757 and the Internet address.
The following articles can also be found in a LINK to an index arranged by
subject matter.
1. Origin Of
Myrmekite And Metasomatic Granite
2.
Replacement Of Primary Plagioclase By Secondary K-feldspar And
Myrmekite
3.
Microscopic And Megascopic Relationships For Myrmekite-bearing
Granitic Rocks Formed By K-metasomatism
4.
Myrmekite Formed By Ca-metasomatism
5.
Myrmekite Formed By Exsolution?
6.
Myrmekite As A Clue To Metasomatism On A Plutonic Scale; Origin Of Some
Peraluminous Granites
7.
K-differentiation By Magmatic And Metasomatic Processes
8. Po Halos
And Myrmekite In Granite And Pegmatite
9.
Large-scale K- And Si-metasomatism To Form The Megacrystal
Quartz Monzonite At Twentynine Palms, California
10. K- And
Si-metasomatism In The Donegal Granites Of Northwest Ireland
11. Myrmekite
In Garnet-Sillimanite-Cordierite Gneisses And Al-Ti-Zr Trends, Gold
Butte, Nevada
12. Myrmekite In
The Santa Rosa Mylonite Zone, Palm Springs, California
13.
Myrmekite In The Rubidoux Mountain Leucogranite - A Replacement
Pluton
14.
Myrmekite In Muscovite-Garnet Granites In The Mojave Desert,
California
15. Problems
With The Magmatic Model For The Origin Of The Hall Canyon Muscovite
Granite Pluton, Panamint Mountains, California
16.
Sericitization In The Skidoo Pluton, California: A Possible
End-stage Of Large-scale K-Metasomatism
17. The
Mobility Of Iron, Calcium, Magnesium, And Aluminum During K- And
Si-metasomatism
18. Sphene,
Myrmekite, And Titanium Immobility; Implications For Large-Scale K-
And Na-metasomatism And The Origin Of Magnetite Concentrations
19.
Contrasting Characteristics Of Magmatic And Metasomatic Granites And
The Myth That Granite Plutons Can Be Only Magmatic
20. Failure Of
The Exsolution Silica-Pump Model For The Origin Of Myrmekite:
Examination Of The K-feldspar Crystals In The Sharpners Pond
Tonalite, Massachusetts, USA
21. Three
Challenging Outcrops In The Marlboro Formation, Massachusetts,
USA
22.
Myrmekite And K-feldspar Augen In The Ponaganset Gneiss, Rhode
Island, Connecticut, And Massachusetts, USA
23. A Close
Scrutiny Of The "Newer Granites" Of The Caledonian Orogen In Scotland
24. Magmatic
Resorption Versus Subsolidus Metasomatism --- Two Different Sytles
Of K-Feldspar Replacement Of Plagioclase
25.
Petrogenesis Of The Ghooshchi Granite By K- And Si-metasomatism Of
Diorites And Gabbros, Western Azerbaijan, Iran
26. The
Microcline-Orthoclase Controversy --- Can Microcline Be
Primary?
27. Metasomatic
origin of the Cooma Complex in southeastern Australia
28.
Primary microcline and myrmekite formed during progressive
metamorphism and K-metasomatism of the Popple Hill gneiss,
Grenville Lowlands, northwest New York, USA
29. The
K-replacement modifications of the Kavala megacrystal granodiorite and
the Sithonia euhedral-epidote-bearing, hornblende-biotite granodiorite
in northern Greece
30.
The K-replacement origin for the megacrystal Hermon-type granites in
the
Grenville Lowlands, northwestern Adirondack Mountains, New York,
USA
31. The
lateral secretion origin of Fe and Zn ores, resulting from metasomatism
and/or recrystallization of amphibolites and biotite-rich gneisses in
New
Jersey and New York, USA.
32.
Exsolution
vermicular perthite and myrmekitic mesoperthite.
33. Origin of
the
augen granite gneiss in the Bill Williams Mountains, Arizona, USA; A
prediction confirmed.
34. The
K-replacement origin of the megacrystal Lower Caribou Creek
granodiorite and the Goat Canyon-Halifax Creeks quartz monzonite ---
modifications of a former tonalite and diorite stock, British
Columbia, Canada.
35.
Considerations about recent predictions of impending shortages of
petroleum evaluated from the perspective of modern petroleum
science. This article and others dealing with the abiotic origin of
oil has now been linked to another Internet website at http://www.gasresources.net/.
36.
Experimental studies demonstrating metasomatic processes and their
application to natural granitic environments.
37.
Overlooked
experimental evidence for K-replacements of plagioclase and origin of
microcline in granite plutons.
38.
Modification
of a magmatic tonalite to produce a megacrystal granodiorite by
K-metasomatism, Monterey peninsula and northern Santa Lucia
Mountains, California, USA.
39.
Scientific
errors that can result when myrmekite and geologic evidence are
ignored.
40. Evolution
of a
layered diorite-gabbro to become a layered quartz
monzonite-granodiorite
in the Wanup pluton near Sudbury, Canada.
41.K-metasomatism
of plagioclase to produce microcline megacrysts in the Cathedral Peak
granodiorite, Sierra Nevada, California, USA.
42. A study of
intergrowth textures and their possible origin in the Alvand plutonic
complex, Hamadan, Iran.
43.
Myrmekite formation at Temecula, California, revisited: A
photomicrographic essay illustrating replacement textures.
44.
K-metasomatism and the origin of Ba- and inclusion-zoned orthoclase
megacrysts in the Papoose Flat pluton, Inyo Mountains, California, USA.
45. Myrmekite
formed by Na- and Ca-metasomatism of K-feldspar. This article
provides a different model for a metasomatic origin of myrmekite.
46. Nibble
metasomatic K-feldspathization.
47. Petrological
conditions affecting porosity in granite, and negative effects of K-
and Si-metasomatism on the trapping of oil in layered Precambrian quart
diorite-gabbro sills penetrated by the AOC Granite 7-32-89-10 drill
hole near Fort McMurray, Alberta, Canada.
48. Transition
from magmatic to K-metasomatic processes in granodiorites and Pyramid
Peak granite, Fallen Leaf Lake 15-Minute Quadrangle, California, USA.
49. A
possible unsuspected significance of isotopic Rb-Sr "errorchrons."
50. Plate
tectonics, the segmented Laramide Slab, deformation, and large scale K-
and Si-metasomatism.
51. Felsic
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.
52. E
granite, a
new kind of "evolved" granitic plutonic rock
that is formed where K and Si are mobilized.
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
described
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
my
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
formation
of metasomatic granites, has been strongly criticized. I have been
persuaded from thermodynamic arguments that my speculation about
silanes
is wrong. Silanes are so extremely reactive in the presence of water
that
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:
lorencec@sysmatrix.net.
For more information contact Lorence Collins at:
lorencec@sysmatrix.net
Dr. Lorence G. Collins
Department of Geological Sciences
California State University Northridge
18111 Nordhoff Street
Northridge, California 91330-8266
FAX 818-677-2820
This page has been accessed 
since March 26, 1996