کانی زایی اسکارن در ارتباط با توده های گرانیتوئیدی لاهیجان

Do lomites and limestones o f simmilar age as Soltanieh and paleozoic forma tio ns have been tr ansformed to coa rse grained granoblas tic marbles due to in tru sion of granitic masses, located 4 km southeast of Lahijan, Iran, and barite mine ralization have also occurred. Ore mine ra ls are mos tly co ncentr a ted along th e rracture zones in do lo mites and mining activeities in the past was foc used on these fractures and breccia zones. Studies of polished sections under the ore microscope have shown that the major o re mine rals occurring in veins contain magne tit e, pyr ite,pyrot ite chalcopyrite, hematite, goetite, and C'I ~ M g- Fc s ili ca t e~ such as phlogo pite, talk, act inolite, thremolite, diopsidc and chlorite. Magnetite is the major iron mine ral in skarn. This mineral and pyro tit c are considered to be primary and the remaining minerals are considered as second ary. Barite veins with eas t~wes t trends formed by hydrothe rmal activi ties are o bserved in dolomiti and schists ri ght next to the intru sio ns, a round villages such as Di zin and Sarches hmeh. Conside ring the min eralogy, texture and stru cture or these ve in s, it is probab le that they a re crys tallized in fractures at temperatures below 500