شواهدی جدید از فعالیت ماگمایی پرکامبرین و پالیوزوییک در توده قره‌باغ، ‏ شمال باختر ایران‏

The gharebagh intrusive complex which includes mafic, diorite and acidic rocks is a part of the sanandaj-sirjan zone in northwestern of iran ‎and a part of the zagros orogenic belt. this complex has intruded into precambrian metamorphic rocks‏.‏‎ u-pb daiting of zircons of a ‎lueicogranite has been identified 558.6 ± 3.8 ma. the cores of some zircon grains are aged too old to 2400 ma‎‏ ‏in this sample. these are the ‎parts of remained original rocks. it can be inferred that the basement area is older than precambrian intrusive, and maybe indicate the ‎presence of panafrican basement similar to which has been found mainly in the central iran. ages obtained in five gabbro samples are 300.0 ‎‎± 1.3 ma to 301.5 ± 1.3 ma, in two diorite samples 300.7 ± 1.5 ma and in a monzogranite sample 300.7 ± 1.7 ma. age obtained in ‎alkaligranite pach within the gabbros is 303.4 ± 1.5 ma. these rocks have the same ages and that can be inferred that all of them have been ‎affected by one geology event in late paleozoic. based on chemical analysis data, a mantle source for mafic rocks is understanded. this ‎mafic magma has a very high temperature so that its heat causes melting of the lower crust and formation the alkaligranitic magma ‎simultaneously with it intrusion. these datings, shows polotonism of‏ ‏upper paleozoic in the northwestern part of sanandaj–sirjan zone‏. ‏it ‎can be inferred that this is the beginning of neotethys opening in iran.‎