Talk:Sedimentary exhalative deposits

SEDEX and VMS/VHMS

Just a reminder not to confuse SEDEX with VMS deposits; most modern seafloor hydrothermal vents are related to VMS deposits , being related to hydrothermal systems developed above submarine volcanoes, spreading centers, etc, for instance the Marianas Trench, Tonga Arc[1], etc. See Neptune Minerals[2] for their so-called "SMS" or seafloor massive sulphide deposits.

While it is probably correct to correlate the exhalative phase of these deposits, because both tend to result in hydrothermal vents, black smokers, etc, the difference in source and transport is crucial; there are not very many VMS deposits which produce barite mantles, intraformational diaremes, and which are hosted predominantly within sedimentary sequences. In some cases, for nstance in China, these is evidence of SEDEX mineralisation occurring in lake beds within intracontinental rift grabens.

VMS deposits are in all cases correlated with seafloor volcanism, pelagic mud footwalls or volcanogenic footwalls, and lack the basin architecture neccessary for SEDEX to work. They are completely different.Rolinator 06:50, 16 October 2006 (UTC)

Photos needed!

Not a single one! I'll keep my eyes open. Surely we have something around.... --Pete Tillman (talk) 20:27, 13 April 2016 (UTC)

I've added a photo of copper ore from a German sedex deposit. GeoWriter (talk) 21:12, 13 April 2016 (UTC)

Sullivan mine more VMS type?

Well, I found a set of very nice polished-slab fotos of Sullivan (BC) ore. See this Flickr site for the full set.

The problem is, Prof. St. John interprets the deposit as

At the Sullivan Deposit, SEDEX deposition occurred in the collapsed crater of a mud volcano formed by emplacement of regional gabbroic sills into wet, unconsolidated, seafloor sediments that were filling a continental rift basin - a bit of a complex geologic origin. The folded and contorted bedding seen in the sulfide layers formed by soft-sediment slumping.

--cited to Lydon, J.W. 2004. Genetic models for Sullivan and other SEDEX deposits. pp. 149-190 in Sediment-Hosted Lead-Zinc Sulphide Deposits, Attributes and Models of Some Major Deposits in India, Australia and Canada. Narosa Publishing House. New Delhi.

This problem isn't limited to this deposit. Jerome AZ (United Verde) has clear "Black Smoker" chimneys, but not much remnant fine bedding (ims). So there's likely a continuum between (eg) Viburnum/mid continent Pb-Zn deposits that appear to be related to oilfield (like) brines), and the VMS black-smoker guys. --Pete Tillman (talk) 22:00, 13 April 2016 (UTC)

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