Chronology of major metamorphic events in the southeastern United States [Appalachians]

Clicks: 1
ID: 295115
1959
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal

Ranked #2,675 of 8,486 articles by views in american journal of science

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 8,486 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
K-Ar and Rb-Sr age measurements have been made on a variety of granites, pegmatites, gneisses, and schists which comprise the plutonic-metamorphic complex of the Piedmont and Blue Ridge of the southeastern United States. Large portions of the area appear to have been metamorphosed initially approximately at the same time as the Grenville province, i. e., about 900 to 1,100 million years ago. Superimposed on this older metamorphic province was a major orogenic event culminating at about 350 million years with widespread recrystallization of existing rocks and intrusion of pegmatites in the Spruce Pine, Franklin-Sylva and Bryson City districts, and granites in the Virginia and North Carolina piedmont. There is strong evidence of an additional metamorphic epoch between 350 and 1,000 million years, but its effects have been largely obliterated by the 350 million years event. In western North Carolina a transition of apparent ages from 355 to 890 million years occurs in the same rock unit (Cranberry gneiss) over a distance of about 10 mi. across the strike of the border of the 350 million years event. In the southeastern Piedmont of Georgia and South Carolina, a younger metamorphic event or events can be detected producing rocks of apparent age ranging from 230 to 310 million years. The time of these orogenies is compared with those in the central and northern Appalachians. Evidence is accumulating that the Holmes' time scale will have to be considerably lengthened.
Reference Key
openalex_W2034465753 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lingliang Long, J. Laurence Kulp, F. D. Eckelman
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.8.585
URL
https://doi.org/10.2475/ajs.257.8.585
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.