REE distribution in the clay fraction of pelites from the Southern Apennines, Italy

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doi: 10.1016/0009-2541(92)90180-D
Authors:Caggianelli, A.; Fiore, S.; Mongelli, G.; Salvemini, A.
Author Affiliations:Primary:
Università della Basilicata, DITEC, Potenza, Italy
CNR, Italy
Volume Title:Chemical Geology
Source:Chemical Geology, 99(4), p.253-263. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1992
Note:In English. 30 refs.; 4 tables
Summary:In order to evaluate whether clay minerals or accessory phases control the REE pattern of the < 2- mu m fraction of pelitic sediments, a set of samples from a borehole in the S Apennines was analysed for mineralogy and chemical composition (major elements, Rb, Sr, Y, Zr, Nb and REE). SEM analyses showed the presence of accessory phases such as Ti-oxides, apatite, zircon and pyrite. XRD procedures revealed that the < 2- mu m fraction essentially consists of illite, smectite, dickite, kaolinite and chlorite. Illite and smectite probably derived by leaching from a micaceous 'biotite-like' mineral, while dickite originated from post- depositional, interstitual fluids. Only illite is correlated with REE, while a smectite-rich sample is characterized by the lowest content in REE. Strong correlations exist between these elements and Y. R-mode factor analysis indicated that three factors account for 87% of the total variance. The first factor (Var = 43.2%) seems to express mainly the tendency of some resistate minerals to concentrate REE in the fine fraction. The second factor (Var = 30.0%) may be related to the effect of circulating fluids responsible for dickite genesis. The third factor may be linked to the weathering of micaceous phases. The REE do not have a significant weight in the second and third factors. Resistate minerals appear dominant in controlling, at least, the LREE and Nb. It is proposed that in the studied samples, illite is likely to have conveyed REE via the included minerals. [Authors' abstract] [P.Br.]
Subjects:Clastic rocks; Clay mineralogy; Clay minerals; Factor analysis; Geochemistry; Major elements; Metals; Rare earths; Sedimentary rocks; SEM data; Shale; Sheet silicates; Silicates; Statistical analysis; Trace elements; Apennines; Basilicata Italy; Europe; Italy; Potenza Italy; Southern Apennines; Southern Europe; Areal studies; Argille Varicolori; Southern Italy; Tolve
Abstract Numbers:93M/1975
Record ID:1992070951
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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