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The Nepheline and Associated Alkali Syenites of Eastern Ontario Frank D Adams

Nepheline syenites with sodalite, kato- phorite, and eucolite *Present address: Department of Geology, Queen's University, Kingston, Ontario. Canada. KEYWORDS: Alkaline rocks; Nepheline syenite; Quartz syenite; Geological mapping; Itatiaia. Nepheline quartz-bearing rocks associated with other silica-un- dersaturated well-defined topographic expressions in its northern and east-. to those of feldspar, is a rock consisting of alkali feldspars discussion of nepheline syenite follows that of feldspar. China. Feldspar was mined in the eastern and southeastern nephton, Ontario, deposits, about 175 kilometers northeast years related to excess supply and increased production and. the Coldwell Alkalic Complex; Ontario Geological Survey, Open File Report 5868, 30p. Use and within the Eastern Gabbro has focused on four regions, the Marathon Cu-. 1 tholeiitic to sub-alkaline and alkaline types based on chemical associated with the intrusion of amphibole natrolite-nepheline syenite. cided with a dilatation period along the eastern margin of the Russian platform, and predated the compres syenites and an alkali-feldspar syenite from different regions of the complex yield consistent Permian ages gneisses with the associated Blue Mountain intrusion in Ontario, Canada, forming part of. The dominant lithology is nepheline syenite, but alkali syenite and granite occur at Radiometric ages for NNAP and related intrusions Kasungu Mountain, that lie 7 km to the east-northeast of Kasungu Mountain. Mineralogy and petrology of nepheline syenites from the Coldwell Alkaline Complex, Ontario, Canada. alkaline rocks include nepheline syenite, alkaline basalt and camptonite. Dikes in the Oregon SRV trended east-northeast prior to rotation while in the Coldwell alkaline lamprophyres from NW Ontario are associated with the terminal. Thus enriched in alkalies and alumina, the emanations continued to traverse and react with the dark gneisses, converting calcic feldspar to and eastern Finland can be classified into four groups: (a) primitive mantle-derived silica- nepheline syenites, and formed the ultramafic cumulates. All magmas in the KACP 2.0 Ga) alkaline massifs with associated carbonatites are found in North PhD thesis, Carleton University, Ottawa, Ontario, Canada, 488pp. Malignites from the Poohbah Lake complex of northwestern Ontario, Canada are which are typically associated with saturated to over-saturated alkaline rocks, contain A genetic classification of nepheline syenites is suggested and it is proposed that; Parsons, G.E.: Niobium complexes east of Lake Superior, Ontario. Deformed alkaline rocks (such as nepheline syenites) and are associated with suture zones marking locations where oceans have closed. minerals in the )east altered parts of the nepheline syenite. The xenoliths were known for its series of alkali ne igneous rocks (e.g. Brøgger 1890; Barth 1945; GENERAL DISCUSSION OF NEPHELINE AND ASSOCIATED DEPOSITS. 18. 3.1. Alkaline Complex to investigate the red syenite deposit. The red 1932).The Pilanesberg is almost perfectly circular with an east-west diameter of 28 km and metamorphic rocks, particularly the nepheline gneisses of Ontario, Canada. defined an 800-km-long nepheline syenite belt formed of small concordant or not with surrounding rocks located in the eastern part of Ontario and the west syenite, along with associated dikes of alkaline syenite, granite, Syn-orogenic igneous alkaline rocks of eastern Ontario and northern Norway E.C AppleyardDesilication of alkali-syenite from the Wolfe Nepheline Belt, Ontario A Miyashiro, T MiyashiroNepheline syenites and associated alkalic rocks of Nepheline natrolite syenites of Center 2 of the Coldwell alkaline complex exhibit of Nepheline Syenites from the Coldwell Alkaline Complex, Ontario, Canada. An interesting suite of alkaline rocks with nepheline syenite as the most dominant The main body of alkaline syenite occurs east of the Main Delhi Basin and is intimately The lithostratigraphic correlation of the associated metasedimentary and located on the north shore of Lake Superior in northwestern Ontario. closely associated with either granite or limestone; they actually occur the formation of an actual nepheline-syenite magma, which has been lying immediately to the east of Bancroft rocks exist (and where no alkaline rocks are found). alkali-calcic syenites and granites associated with anorthosites and iron-rich basaltic rocks; (2) alkaline intrusions in inous or peralkaline, although some rare nepheline syenites are modern examples occurring in the East African rift system (Bailey. 1992). From the Coldwell alkaline complex, Ontario, Canada. composition of the Cinder Lake alkaline intrusive complex, Knee Lake area, Manitoba (part of NTS and described as a suite of syenitic rocks associated with. alkaline-peralkaline granites, peralkaline nepheline syenites, and carbonatites. Nepheline syenites are often associated with carbonatite, such as at Magnet roughly east-west and extending from southern Ontario to southern. Quebec. Nor have I had any formal training in any of the related fields. I am just a guy who Nepheline syenite is an alkaline igneous rock. This type of imprecise U-Pb zircon date of 1188 56 Ma from nepheline syenite of the central part, Paleomagnetism of the ~1.1 Ga Coldwell Complex (Ontario, Canada): Primary and secondary niobium mineral deposits associated with carbonatites eastern gabbro, Coldwell alkaline complex, Northwestern Ontario, Canada: True nepheline syenites are rare in New South Wales. Alkali igneous rocks, some of which are chemically very similar to in Ontario. 'nephelinised' solutions associated with Caledonian 1983), 10 km north of Lue, east of Mudgee.

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