Stratigraphic and Lithogeochemical Characterization of Cycle Volcanism in the LG-3 Area
- Organization:
- Canadian Institute of Mining, Metallurgy and Petroleum
- Pages:
- 16
- File Size:
- 5306 KB
- Publication Date:
- Jan 1, 1984
Abstract
The Archean volcano-sedimentary succession in the LG-3 area has
undergone two phases of deformation and has been metamorphosed to
upper greenschist and amphibolite facies. Marine, fine-grained
sediments and mafic pyroclastics comprise the lowest observed stratigraphic
unit. These sediments are overlain by a thick sequence of
submarine basalts and minor basaltic andesite. The lavas are characterized
by high Al/Al+Si, Ti values, low Mg numbers and flat REE
profiles (lOx chondrite). A sedimentary prism of coarse elastics
which was deposited close to an exposed plutonic highland, overlie
the volcanics. Massive lavas of basaltic andesi te and associated
volcano-sediments comprise the uppermost stratigraphic unit. These
lavas are characterized by high Mg numbers, Ni, Cr, LREE (lOOx
chondrite) but low Ti, Al/Al+Si and HRee. The supracrustal rocks
were intruded by tonalites and tonalitic gneisses.
Citation
APA: (1984) Stratigraphic and Lithogeochemical Characterization of Cycle Volcanism in the LG-3 Area
MLA: Stratigraphic and Lithogeochemical Characterization of Cycle Volcanism in the LG-3 Area . Canadian Institute of Mining, Metallurgy and Petroleum, 1984.