Memorial University DAI: Ordovician tectonic evolution of the southern Long Range Mountians, Newfoundland

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Title	Ordovician tectonic evolution of the southern Long Range Mountians, Newfoundland
Author	Hall, Lindsay Anne Forsyth, 1965-
Description	Thesis (M.Sc.)--Memorial University of Newfoundland, 1999. Earth Sciences
Date	1998
Pagination	ix, 102 leaves :\|bill. (some col.), maps (1 fold. in pocket)
Subject	Geology, Structural--Newfoundland and Labrador--Long Range Mountains; Geology, Stratigraphic--Ordovician
Degree	M.Sc.
Degree Grantor	Memorial University of Newfoundland. Dept. of Earth Sciences
Discipline	Earth Sciences
Language	Eng
Spatial Coverage	Canada--Newfoundland and Labrador--Long Range Mountains
Temporal Coverage	Paleozoic Era--Ordovician Period
Notes	Bibliography: p. 96-102.
Abstract	The rocks of the southern Long Range Mountains consist of metamorphosed mafic, ultramafic, sedimentary and felsic intrusive rocks and granite plutons. The mafic and ultramafic rocks constitute the Long Range Mafic-ultramafic Complex, the oldest rocks in the area. Pelitic to psammitic metasedimentary rocks with entrained fragments of the Long Range Mafic-ultramafic Complex comprise the Mischief MÃ©lange. The Cape Ray Igneous Complex consists of deformed and metamorphosed tonalitic, granitic and granodioritic rocks which cut the Long Range Mafic-ultramafic Complex and the Mischief MÃ©lange. This complex includes the Cape Ray Granite (488 (+/-3) Ma), Long Pond Tonalite (472 (+/-2) Ma) and the younger Staghill Orthogneiss which intrudes the other members of this complex and cuts features of early deformation. Four plutons, the Pin (449 (+2/-3) Ma), Red Rocks, Strawberry (384 (+/-2) Ma) and Dragon Lake granites and dykes associated with them cut all older rocks and structures. -- The rocks of the southern Long Range Mountains record Ordovician orogenesis, namely, the generation of an ophiolite suite (the Long Range Mafic-ultramafic Complex), its obduction and association with a mÃ©lange (the Mischief MÃ©lange), the generation of a continental arc (the Cape Ray Igneous Complex) and further obduction and plutonism (granites). Amphibolite grade peak metamorphism pre-dates the intrusion of the Staghill Orthogneiss, however, the rocks remained in a deformational and metamorphic regime during and after the emplacement of the Staghill Orthogneiss. Dated at 449 Ma, the post- tectonic Pin Granite provides a lower limit for the cessation of penetrative deformation in this area. Plutonism was renewed in at least one distinct event with emplacement of the 384 (+/-2) Ma Strawberry Granite. -- Rocks of the southern Long Range Mountains occur in the hanging wall of the Long Pond Thrust, a southeast dipping thrust which intersects the escarpment of the much younger Cabot Fault. To the southeast the rocks are bounded by the Cape Ray Fault that dips southeast and separates Gondwanan and Laurentian elements of the earlier lapetus Ocean.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a1356086
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(35.16 MB) -- http://collections.mun.ca/PDFs/theses/LindsayAnneHall.pdf
CONTENTdm file name	39392.cpd