A systematic approach to radiometric and paleomagnetic studies in a mobile orogenic belt: I. The waning phase of activity in the southern Appalachians of South Carolina

Details A systematic approach to radiometric and paleomagnetic studies in a mobile orogenic belt: I. The waning phase of activity in the southern Appalachians of South Carolina A systematic approach to radiometric and paleomagnetic studies in a mobile orogenic belt: I. The waning phase of activity in the southern Appalachians of South Carolina

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984geosu...7...27d&link_type=abstract

Geophysical Surveys, Volume 7, Issue 1, pp.27-54

Physics

Scientific paper

The survey of radiometric and paleomagnetic work on the mafic rocks of South Carolina is consistent with, and amplifies the studies on the acidic rocks of the southeast by Ellwood (1982). The westerly post-early Mesozoic tilt of the southeastern Appalachians proposed by Dooley and Smith (1982) over most of the Piedmont balances out the post-late Paleozoic southeastern tilt of Ellwood (1982). Only in the Elberton-Sparta block is the tilting important and here the interpretation proposed is of a greater initial tilt (approximately 25 30°) reduced by the post-early Mesozoic tilt. There is no evidence of displaced terrains as far as the King's Mountain, Charlotte, and Slate belts are concerned at least since 300 m.y. ago and perhaps as early as 350 m.y. ago. The anomalous paleomagnetic data from the Kiokee belt is best interpreted as due to tectonic displacements associated with the late Paleozoic event described by Secor and Snoke (1978) and Snoke et al. (1980). The paleopoles of the mafic rocks are in agreement with paleopoles on the North American apparent polar wander path (APWP) at about 300 m.y. The resolution of K-Ar apparent ages of 350 m.y. or older will require40Ar/39Ar studies and such age relationships are critical to the reasonable application of tilt corrections in the southern Appalachians.

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