Platinum-group elements in the cores of potassium feldspar spherules from the Cretaceous-Tertiary boundary at Caravaca (Spain)

M. Ortega Huertas; F. Martínez Ruiz; P. Acquafredda; I. Palomo

doi:10.3989/egeol.94501-2303

Platinum-group elements in the cores of potassium feldspar spherules from the Cretaceous-Tertiary boundary at Caravaca (Spain)

Authors

M. Ortega Huertas Departamento de Mineralogía y Petrología. Facultad de Ciencias. Universidad de Granada
F. Martínez Ruiz Scripps Institution of Oceanography. University of California
P. Acquafredda Dipartimento Geomineralogico. Universita di Bari
I. Palomo Departamento de Mineralogía y Petrología. Facultad de Ciencias. Universidad de Granada

DOI:

https://doi.org/10.3989/egeol.94501-2303

Keywords:

PGE, cores, pottassium féldspar, spherules, Cretaceous-Tertiary boundary

Abstract

The abundant spherules present in the Cretaceous-Tertiary boundary layer at Caravaca are diagenetically transformed to potassium feldspar. Before our study no possible relicts of the precursor material had been reported. but in this paper we describe the presence of cores in these spherules that could represent a relict of the «unknown precursor». These cores are made up of C mixed with Si. Mg. AL Cr. Ca among other elements. Laser Ablation System analysis also reveals an enrichment in pe;E could suggest an extraterrestrial origin for this material. PI. Pd and Ir do not show a chondritic ratio: however. asevere modification of their concentration could be expected during the early diagenetic processes.

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Published

1994-04-30

How to Cite

Ortega Huertas, M., Martínez Ruiz, F., Acquafredda, P., & Palomo, I. (1994). Platinum-group elements in the cores of potassium feldspar spherules from the Cretaceous-Tertiary boundary at Caravaca (Spain). Estudios Geológicos, 50(1-2), 3–7. https://doi.org/10.3989/egeol.94501-2303

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Issue

Vol. 50 No. 1-2 (1994)

Section

Articles

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