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First Data on Clay Mineral Assemblages and Geochemical Characteristics of Toarcian Sedimentation in the umbriamarche basin (central italy)

Published online by Cambridge University Press:  09 July 2018

M. Ortega-Huertas ,
P. Monaco  and
I. Palomo
M. Ortega-Huertas
Affiliation:
Departamento de Mineralogia y Petrologia, 1AGM, Universidad de Granada, Spain and
P. Monaco
Affiliation:
Departamento de Mineralogia y Petrologia, 1AGM, Universidad de Granada, Spain and
I. Palomo
Affiliation:
Departamento de Mineralogia y Petrologia, 1AGM, Universidad de Granada, Spain and
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Abstract

A moderate to high rate of clay sedimentation is characteristic of the Toarcian sequences in the Umbria-Marche basin. The clay mineral assemblages and geochemical characteristics indicate that the Marne di Monte Serrone Formation and the Rosso Ammonitico Umbro-Marchigiano Unit were deposited in a shallow marine environment. In this general palaeogeographic scheme, a reducing subenvironment must have exsisted in which black shale-type facies were deposited resulting in geochemical anomalies in As, Sb, Zn, Co, Cu, Pb, V, Cr, and Ba, among other elements. The high values of both the detrital index and the Ce/Ce* ratio reveal the influence of proximal emerged reliefs. It is suggested that the palaeosoils that developed on the Liassic carbonate Laziale-Abuzzese platform were the source area of these sediments, following a palaeogeographic scheme analogous to that proposed for the Betic Cordilleras (Spain) during the Middle Domerian to Middle Toarcian. The positive and negative Eu anomalies are due to the decisive influence of the weathering process in which sediments with heterogeneous Eu anomaly size were mixed. The final distribution pattern of REE is the result of the different environments to which the clay minerals were subjected and the differences in intensity of weathering.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 2 , June 1993 , pp. 297 - 310
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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