Haxiyatu iron-polymetallic deposit

a typical Triassic skarn deposit

is located in the tectonic belt of East Kunlun. To make clear of the metallogenic materials

this paper used oxygen

sulfur

lead isotope to trace magnetite

pyrite and sphalerite. The δ

18

O value of magnetite was2.7‰~4.1‰

which indicated that the atmospheric precipitation was included in the metallogenic fluid except the magma water The δ

34

S value of pyrite and sphalerite was .63‰~6.30‰ and the total sulfur value was 3.77‰

which meaned that the sulfur in the mine may originate from the mixed magma of the crust-mantle. The lead isotope change of pyrite was smaller

for example

the values of

208

Pb/

204

Pb、

207

Pb/

204

Pb、

206

Pb/

204

Pb were 38.471~38.629、15.627~15.671 and 18.435~18.473 respectively

which showed the crust-mantle mixing origin yet. Based on the ore-forming pluton and the regional tectonic background

it's maintained that the metallogenic material may come from the mixing magma of the crust and mantle and mix in some iron materials in the ore-forming process. The mineralization process may be as follows: the subduction slab metasomatized the mantle and a partial melting occurred. During the process of invasion

the felsic rocks (TTG) of lower crust were partially fused

and then formed the mixing magma. In the space of magmatic emplacement

the precipitate water or the stratigraphic syngenetic water infiltrated through the cracks

mixed with the quartz diorite again

making the ore-bearing hydrothermal solution metasomatized the carbonate

and finally to form the skarn deposit.