Fig 3 - uploaded by Joaquín Delgado
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(a) Isocon diagram of REE concentration in the orebody sulphide (Co) vs. concentration in the gossan (Cf); and (b) percent element loss plot showing relative loss of the REE in average gossan compared to average orebody sulphide. Note the relatively highest loss of middle-REE in the gossan. See text for calculations. In (a) CV: line of constant volume and CM: line of constant mass.
Source publication
The São Domingos mine is one of the most emblematic mining districts in the lower part of the Guadiana River Basin (SW of Iberian Peninsula). It is located in Portugal (about 5 km from the Spanish border), in the northern sector of the Iberian Pyrite Belt (IPB), one of the largest metallogenetic provinces of massive sulphides in the world. Although...
Contexts in source publication
Context 1
... and considering Lu as the immobile element, the percentage M of loss or gain of each remaining REE is estimated as follows: M =[((Cf/Co)/S) − 1] × 100, where Cf and Co are REE concentrations in gossan and orebody sulphide, respectively, and S is the immobile isocon defined as the slope of the line of the immobile elements in the isocon diagrams (Fig. ...
Context 2
... the São Domingos deposit, the percent loss of REE during supergene weathering is not uniform and ranges from 0 to −44% (Fig. 3b). The relative losses are higher for MREE (average of −34%) than those for LREE and HREE (average of −9%). The immobility of La during weathering of massive sulphides has also been documented in the literature (Belkabir et al., 2008). The existence of jarosite-rich gossans capping the orebody indicates that acid weathering of ...
