Figure F145. Downhole variation of vein mineralogy plotted with running averages of lithology. Quartz is common in the top 400 m of the hole but essentially disappears by 800 mbsf. Except for a possible spike early in the hole (not confirmed by XRD or thin section), zeolites first appear near 700 mbsf and increase regularly to the bottom of the hole. Sulfides are most common in the uppermost 400 m of Hole U1309D.
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