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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 42 (1972)No. 2. (June), Pages 301-306

Correlation of the Previous HitBishopNext Hit Ash, a Pleistocene Marker Bed, Using Instrumental Neutron Activation Analysis

G. A. Borchardt (3), P. J. Aruscavage, H. T. Millard, Jr.


Neutron activation analyses confirmed a previous correlation of a white rhyolitic volcanic ash bed with the Previous HitBishopNext Hit Tuff of eastern California. Distinctions were made between the glass fractions of Previous HitBishopNext Hit and Pearlette-like ashes, both of which occur in middle Pleistocene deposits of California, Utah, Colorado, and Nebraska. A third type of ash (ash of Green Mountain Reservoir), petrographically similar to the Previous HitBishopNext Hit Tuff, appeared to be chemically distinct. A coefficient was introduced as a simple measure of multivariate similarity. Discriminant function analysis indicated that Mn and Sm were most useful in distinguishing chemically between Previous HitBishopTop, Green Mountain Reservoir, and Pearlette-like ashes. Both statistical methods confirmed conclusions drawn from visual observation of the da a.

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