NDLI: Relationship between high- and low-grade archean terranes: implications for early earth paleogeography

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Relationship between high- and low-grade archean terranes: implications for early earth paleogeography

Content Provider	NASA Technical Reports Server (NTRS)
Author	Eriksson, K. A.
Copyright Year	1986
Description	The Western Gneiss Terrain (WGT) of the Yilgarn Block, Western Australia was studied. The WGT forms an arcuate belt of Archean gneisses that flank the western margin of the Yilgarn Block. In general the WGT is composed of high-grade orthogneisses and paragneisses which contain supracrustal belts composed largely of siliciclastic metasediments and subordinate iron formation. The platformal nature of the metasedimentary belts and lack of obvious metavolcanic lithologies contrasts with the composition of typical Yilgarn greenstones to the east. Radiometric data from WGT rocks indicates that these rocks are significantly older than Yilgarn rocks to the east (less than 3.3 Ga) and this has led to the suggestion that the WGT represents sialic basement to Yilgarn granite-greenstone belts. The Mount Narryer region exposes the northernmost occurrence of high-grade metasediments within the WGT and consists of quartz-rich clastic metasediments at upper amphibolite to granulite grade. Most occurrences of supracrustal rocks in this region comprise isolated lenses within the gneissic basement. However, at Mount Narryer a unique sequence of metaclastics with preserved bedding provide an unusual window into the parentage of similar supracrustal bodies in this region.
File Size	2260689
Page Count	60
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860018230
Archival Resource Key	ark:/13960/t4xh4gt0h
Language	English
Publisher Date	1986-01-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Precambrian Period Metamorphic Rocks Geochronology Structural Properties Geology Stratigraphy Metamorphism Geology Australia Sediments Gneiss Granite Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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