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10:41
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Originally posted by 2ic:
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Heavy lateritic weathering over long time oxidises and leaches minerals in the carb to new minerals, and water percolating down into ground removes lots of dissolved elements like Ca, Mg etc. When weathering is heavy enough, it will even dissolve the resistant minerals like pyrochlore which host most of the niobium in the fresh carb rock. So the upper part of oxidised weathered profile is often barren of Nb because it has been leached away also...
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Thx for explaning!
(20min delay)