Dear Ijaz: Even though native sulphur deposits are usually found in volcanic and solfataric environments, associated with volcanic arcs, such as Japan, Indonesia, an so on, it is possible to generate them by reduction of the Ca-sulfate associated with salt diapirs. A very tectonised salt diapir field occurs in southern Sicily, in Italy, there the original gypsum and/or anhydrite have suffered bacterial reducion generating perfect, big and spectacular ortorhombic sulphur crystals accompanied with pseudohexagonal prismatic aragonite crystals. These mines, locate near Agrigento, were known since Greek and Roman Empire times... Powdered sulfur then was used mainly to kill parassites in the vineyards! And there's no doubt that Sicily is located in a collision setting, this terrane formed when the African plate collided with the Eurasian plate to form the Alps. All of Sicily is a set of thrusts involving sedimentary jurassic-cretaceaous rocks, and a Palaeozoic-Precambrian basement which was once part of the African plate. Cenozoic foraland basins developed onto this old basement. The Etna volcanic complex is a lot younger and has been superimposed on the complex nappe structure of the island (Notice: both my parents were from Sicily, and I have cousins living there which are geologists, that's why I know well the geology of the island).

With regards. Sebastian.

Dear Mr. Ahmad:

Please find below the deposits of sulfur:

Magmatic sulfur deposits

Volcanic massive sulfide Pb-Zn-Cu deposits (VMS)

Besshi-type (31a B)

Cyprus-type (31d B)

Iberian-type (31b B-31b D)

VMS deposits in medium to high grade metamorphic terrains of unknown type (31d BCD)

Contactmetasomatic Fe deposits (Fe sulfide skarn) (31c CD)

Hot brines (31a CD)

Sedimentary sulfur deposits

Marine Ca sulfate deposits from sabkha to deeper marine (31d KL)

(Volcano)-sedimentary Cu-bearing Fe sulfide deposits (SEDEX) (31a J)

SEDEX/SMS Pb-Zn-Ag-(Ba) deposits (31b J)

Diagenetic (bacterial) sulfurization of stratiform gypsum deposits (31c L)

Gypcretes (31a H)

Sulfur-bearing dune sands (White sands) (31a I)

Salt dome related sulfur deposits

gypsum/ anhydrite caprock (31a L)

S -(Ba-Sr sulfate) caprock (31b L)

Sulfur in coal (31a N)

Sulfur in oil shales and tar sands (31dI J)

Desulfurization of natural gas (31b N)

You can use for reference to your issue all magmatic deposits. The codes refer to the "Chessboard classification scheme of mineral deposits....(.Dill 2010)" where you can find  futher details on each  type of deposits.

I wish you much success

H.G.Dill

kindly, you can see my contribution on research gate to get something useful about sulfur deposits and origin

I think you can find your answer in Metal deposits in related to plate tectonic book.

Frederic J. Sawkins

I read it and you can see chapter 9 that describe about collision environments and mineralisation.

Good Luck

I thnk most sulfur deposits and most sulfur production is from evaporite deposits (e.g. Saskatchewan), and the formation of the original evaporitic gypsum souce would normally be in divergent and rift settings (e.g. opening of the Gulf of Mexico, South Atlantic, Zechstein). Hpowever the actual formation of sulphur from the gypsum often occurs by reduction in salt domes that have penetrated overlying passive margin settings (e.g. Texas Gulf Basin).

The volcanic settings of sulfur are mostly arc settings or back-arc rifts (e.g. North Island NZ, Nevada).

I am not aware of important sulfur deposits in collisional settings, so I am unclear as to exactly what you want to know. Could you please be more specific?

Answer to both Martin and Ijaz: Surely salt domes form in passive margins, after the rift-opening stage, but almost every collisional setting involves the collision of a passive margin with either an active margin or a volcanic arc (or complex combinations of both, such as in Karakorum). Therefore a former passive margin, with its salt domes, can be tectonized and becomes part of a highly deformed nappe structure, as it has happened in Sicily, Zipaquirá (Colombia) and elsewhere. In the Gulf of Mexico salt domes have also developed sulfur caps from bacterial reduction of Ca-sulfates, but the setting there, since the Jurassic, hasn't changed, and it is still a passive margin. Regards. Sebastian.

Yes, that is where I said the sulphur forms. I would normally assume that someone was asking where a deposit forms, not where is it now (and the question was not completely clear, presumably because English is not Ijaz' native tongue).  For example, VMS deposits do not form in obducted ophiolites although they can end up in them once the sea floor crust is obducted. Porphyry deposits that form in arcs can end up in collisional settings, but do not form in them. Anything that forms in an ocean floor, arc, passive margin or in some cases possible rift setting (e.g. Damaran) can end up in a collisional environment, although that may be hundreds of millions of years after the deposit forms in some cases. By contrast, tin granites often FORM in association with a collisional setting, and other types of deposits form in late basins associated with such settings. I assumed the question related to the genesis of sulfir deposits - where a deposit is now does not tell us much. And there are combinations that are quite common other than what you mention - arc/continent collisions can occur at a subduction zone without a passive margin, arc-arc collisions can occur, oceanic ridge/continent collisions can occur (although strictly not usually called a collisional margin, it is a collision and can have dramatic implications re mineralisation and tectonics, with either massive transform to transcurrent evolution or intra-continental responses to the attempt to partly subduct a ridge.g. Gulf of California, Juan de Fuca plate, Peru margin). Hence my reply.

Apologies Ijazm your quesion was actually clear - you specifically asked about GENESIS of salt deposits which was what I was describing. Usually formed in salt structures in a passive margin sequence, but formed within evaporites formed earlier during rifting (or alternatively formed in a volcanic setting). But I don't know of any that formed within a collisional environment, although it is possible that they could form from evaporites deposited in some sort of successor basin superimposed on a collisional setting. What specifically did you want to know?

I imagine that the transcurrent faulting that can be associated with collisional margins could also form pull-apart basins in which diapirs might rise and in which sulfur deposits might form, but I am personally unaware of any examples (perhaps the Zagros where I think this diapirism occurs at least?). And the situation that Sebastian cites could concievably result in some late formation of sulphur deposits (eg if the gypsum is there, petroleum can migrate at various times to form sulfur deposits). However I am not aware of examples and Sebastian, I assumed that you are referring to simple transport of earlier sulphur within the nappes (but you appear to say the diapirs are tectonised, not specifically the sulfur deposits, so I might have misunderstood you). Such cases would of course be in a collisional environment. 

Thanks for valuable comments from high esteem experts. I have some examples in the form of sulfur springs, sulfur leaching from Pakistan. Along main mantle thrust/Indus suture (MMT) i.e southern margin of Kohistan Islad Arc and some sulfur surface exposure/leaching at the northern margin of Kohistan Island Arc just north of Gilgit city, as well as in Astak valley Gilgit-Skardu road northern Pakistan (well famous for gems) sulfur surface leaching is evident (here samples were taken for analysis, gold was detected after analysis). 

From Sulaiman fold-thrust belt west Pakistan, sulfur spring is evident in this sedimentary area bearing gypsum deposit as well.

I wanted to know either sulfur is formed during collision processes or pre-collision deposits they are.

Regards

IJAZ

From west Pakistan, sulfur spring location see the link below.

http://www.maplandia.com/pakistan/punjab/dera-ghazi-khan/zinda-pir/

In terrain view

http://travelingluck.com/Asia/Pakistan/Punjab/_1162066_Zinda+P%C4%ABr.html

Is the sulfur mineralization associating evaporites,in this case may not associating collision, may be rifting like those existing on both sides of Gulf of Suez;Hammam Faroon and Jemsa sulfur deposits as well as Ranga in the southern part Red Sea western coastal zone.