 Overview
of the KPg boundary interval in the Barranco del Gredero, the
boundary clay slopes to the left in the mid-foreground and
is exposed from the top right to the bottom left in the man
Barranco
|
 Paleocene section (see graph) from the KPg boundary to the
P3 (G. uncinata Zone), P3 is confined to the 5m red band in
the middle of the Paleocene section. Some calcareous
turbidite intervals are visible in the middle of the
picture
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 For
other localities of the KPg boundary in Spain, click in the image
|
 Chicxulub
ejecta layer, at the locality marked by a cross of Figure 1.
The tektonic slickensides that follow usually the claylayer
just above or inside the ejecta layer, are here fortuitously
high in the dark boundary clay.
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 Ejecta
layers at the Barranco del gredero at the locality in the
middle (GPS.........) Polished surface, about half of the
microkrystites are here white and altered into a low-
ordered K-feldspar, sanidine. The other half is here not
visible, but consist of flattened smectite, stained red by
iron oxides. Ni-rich spinel crystals seem floating in a the
matrix, but actually occur within spherules
|
 Thin
section of a microkrystite from the KPg boundary ejecta
layer of Caravaca The fibrous fans of crystals of sanidine,
lined by goethite, are pseudomorph after Ca-rich augite (as
found at DSDP site 577) , or a ca-rich plagioclase, of which
no original phase has been traced yet
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 Quench
spinel, Cr and Ni rich magnesioferrite from sample sm75-503.
These spinels can be easily extracted from the matrix,
because the host spherule has weathered to soft clay that
disaggregates in peroxide (SEM image by Saskia Kars)
|
 Quench
spinel, Cr and Ni rich magnesioferrite from sample
sm75-503. (SEM image by Saskia Kars)
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 For
comparison, the graded Tetritskaro, Rep. of Georgia, layer
of microkrystite spherules
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