LITHO-GEOCHEMICAL PROXIMITY INDICATORS FOR STRATA-BOUND BASE METAL DEPOSITS
The objective of this investigation was to study the kind and extent of dispersion haloes surrounding base metal mineralisations. From the geochemical results of the host rocks, lithogeochemical indicators should be derived by studying element distributions. Representative metallotects have been selected in the Iberian pyrite belt, the Carnic Alps of Italy and S.E. Sardinia. Lithogeochemical proximity indicators were developed and proved in the Iberian Belt. In the Carnic Alps and in S.E.Sardinia, the studies strikingly revealed the typical limitation of this concept. The formation of mineralisations may include that primary dispersion haloes were obliterated or eventually eroded later on, and the ores being remobilized or mechanically reworked. Secondary haloes did not always develop, in particular not if there was no fluid rock interaction. The concept of lithogeochemical proximity indicators as a tool for exploration can be generally applied to highly permeable sedimentary or volcanic-sedimentary sequences, not or only weakly metamorphosed. Strongly remobilized mineralisations, largely bound by faults, veins and fissures did not develop far reaching haloes. Mechanical reworked primary mineralisations did not significantly interact with their new host rocks.
Bibliographic Reference: EUR 10826 EN (1986) MF, 108 P., BFR 300, BLOW-UP COPY BFR 550, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989125040700 / Last updated on: 1987-07-01
Available languages: en