in Kingston .
Written in English
|LC Classifications||QE 191 M8 1972 thesis|
|The Physical Object|
|Number of Pages||69|
Petrographic Study of The Hammell Lake Anorthositic Gabbro Complex: Queen's University: Property: Hard Copy: RL Noble, Stephen Russell: Geology, Geochemistry and Isotope Geology of the Trout Lake Batholith and the Uchi-Confederation Lakes Greenstone Belt, Northwestern Ontario: University of Toronto: Ph.D. Stratigraphic. KAMINENI D. C. () A petrochemical study of calcic amphiboles from the East Bull Lake anorthosite-gabbro layered complex, District of Algoma, Ontario. Contrib. by: 4. An example of post-collisional mafic magmatism: the gabbro–anorthosite layered complex from the Tin Zebane area (western Hoggar, Algeria). The plutons range from unzoned, equant bodies of olivine gabbro less than 1 km in diameter to elongate intrusions up to 25 km in length that are reversly zoned from olivine gabbro cores to quartz diorite rims. The felsic rocks dip inward beneath the mafic core, indicating that this zoning reversal continues to by:
Photomicrographs illustrating petrographic characteristics of the Bad Vermilion Lake Complex. (a–b) Anorthosite with primary coarse, euhedral plagioclase grains. (c–d) Gabbro with abundant chlorite group minerals. (e–f) Gabbro containing plagioclase altered to epidote group by: The principal conclusions of this study are: 1. The Fiskenæsset Complex appears to have been intruded as multiple sills of magma and crystal mush into a Mesoarchean oceanic island arc, forming an association of anorthosite, leucogabbro, gabbro, chromitite, peridotite, pyroxenite, hornblendite, and dunite layers. by: Photomicrographs illustrating petrographic characteristics of anorthositic rocks of the Chimalpahad Complex and the bordering meta-volcanic amphibolites. All are in crossed polars. a–f. (a) Bent twin lamellae in a deformed plagioclase grain from a gabbro. (b and c) Polygonal orthopyroxene and clinopyroxene grains with triple by: 40ArAr incremental heating studies have been carried out on samples taken from the Tudor Gabbro, Grenville Province, Ontario. In an earlier K-Ar study.
Lithological map of the gabbro-anorthosite intrusive body in the study area showing the compositional layers and the locations of the samples for petrographic studies. Field photographs of the. Following initial anorthosite-gabbro magmatism at ca. Ga and a cryptic Ga event marked by zircon and monazite growth, the Uvauk complex experienced two high-grade tectonometamorphic. and geochemistry of ﬁne- and medium-crystalline dolomites, and compares them with late-stage coarse-crystalline and saddle dolomites. GEOLOGICAL SETTING The Middle Devonian Presqu’ile barrier is located in the northern part of the Western Canada Sedimentary Basin (Fig. 1). It is a linear carbonate reef complex at least km long with a width. Calcic amphiboles are ubiquitous in the East Bull Lake anorthosite-gabbro complex, northeastern Ontario. The mode of occurrence suggests the amphiboles replaced clinopyroxene throughout the stratigraphic levels of the pluton, but they are also prolific in the top younger units. Three types of amphiboles, namely (1) tremolite-actinolite, (2) actinolitic Cited by: