Paleomagnetism of Precambrian rhyolites from Southeastern Missouri
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Date
1984
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Publisher
The Ohio State University
Abstract
Twenty four samples of rhyolite from six sites in the Taum Sauk Mountain region were sampled for paleomagnetic investigation. Paleomagnetic techniques were applied to the rocks in an attempt to identify a component of rotational movement along a mapped fault. All samples indicate multi-component behavior, with remanence being carried by magnetite and/or hematite. Within core specimen magnetic dispersion was low, however between sample dispersion was significantly high. This high between sample dispersion made any attempt to identify a rotational component of movement along the fault impossible. Sources of the dispersion of magnetic results include: 1) variation in the primary magnetic comonent due to inhomogeneous aquisition of remanence within a cooling unit.; 2) differential weathering within a unit. ; 3) lightning strikes.