مطالعه توده نفوذي ديوريتي و زينوليت هاي پيروكسنيتي و آندزيتي در جنوب غرب سرخ شاد (شمال شرق استان اصفهان)

Study of Dioritic Intrusion and Pyroxenitic and Andesitic Xenoliths from SW of Sorkh Shad (NE of Isfahan Province)

There are outcrops of Lower-Oligocene dioritic intrusions in south west of Sorkh Shad (NE of Isfahan province). One of these intrusions that is near to Chah Senjed and Chah Ghandehari, has many andesitic and pyroxenitic xenoliths. Studies conclude that these xenoliths are separated from wall rock during the melt ascending and carried to upper parts. Because of similar composition of andesitic xenoliths and ascending dioritic melt, the andesitic xenoliths are intact but a chemical potential gradient was established between the dioritic melt and ultrabasic xenoliths and calcium and aluminum added to xenoliths for new minerals and pyroxenite formation. The possible temperature of pyroxenites formation was 790 to 850 °C.