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Gold Prospecting
Metal Detecting for Gold
Gold & Its Association With Ironstone
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<blockquote data-quote="user 4386" data-source="post: 519020" data-attributes="member: 4386"><p>In this typical cross-section, bedrock is unweathered, saprock is bedrock weathered to white clay (but you can still recognise the texture of the bedrock in it - bedding, cleavage etc). In saprolite it is so totally weathered to white clay that you cannot recognise any features of the original bedrock). The mottled zone is where ironstone nodules start to appear (see fig 13.46 above). Lateritic duricrust is commonly massive ironstone above the mottled zone (also in that figure) - "ironstone". Lateritic gravels above that form by break-down during more recent weathering of the underlying duricrust (all those rounded black pebbles you see mixed in with soil - the soil itself being a thin, modern layer on top of it all. </p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1572245128_idealized-weathering-profile-evolving-toward-a-mature-laterite-modified-from-mcqueen.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="user 4386, post: 519020, member: 4386"] In this typical cross-section, bedrock is unweathered, saprock is bedrock weathered to white clay (but you can still recognise the texture of the bedrock in it - bedding, cleavage etc). In saprolite it is so totally weathered to white clay that you cannot recognise any features of the original bedrock). The mottled zone is where ironstone nodules start to appear (see fig 13.46 above). Lateritic duricrust is commonly massive ironstone above the mottled zone (also in that figure) - "ironstone". Lateritic gravels above that form by break-down during more recent weathering of the underlying duricrust (all those rounded black pebbles you see mixed in with soil - the soil itself being a thin, modern layer on top of it all. [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1572245128_idealized-weathering-profile-evolving-toward-a-mature-laterite-modified-from-mcqueen.jpg[/img] [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Gold & Its Association With Ironstone
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