پیوندهای مفید
اخبار و اعلانات
آمار
| تعداد نشریات | 48 |
| تعداد شمارهها | 1,235 |
| تعداد مقالات | 10,619 |
| تعداد مشاهده مقاله | 21,482,863 |
| تعداد دریافت فایل اصل مقاله | 14,460,924 |
Alkaline basic dykes in the central part of Sanandaj-Sirjan zone (Iran) | ||
| Quarterly Journal of Tethys | ||
| شناسنامه علمی شماره، دوره 1، شماره 1، خرداد 2013، صفحه 41-58 اصل مقاله (1.41 M) | ||
| چکیده | ||
| There are three different basic dykes in the northeast of Golpayegan area, central part of Sanandaj-Sirjan Zone (SSZ) including: mylonitic gabbros (group 1), alkali dioritic-basanitic dykes (group 2) and alkali monzogabbroic to monzodioritic dykes (group 3). Group 2 and 3 cut post-collisional rocks and are related to after subduction processes of Neo-Tethys. Geochemistry characteristic of studied rocks indicate that group 2 is alkali basalt and two other groups are subalkali basalt-basaltic andesi. Group 2 and 3 are derived from an enriched mantle source. Group 2 is more enriched in HFSE, LILE and REE rather than other groups indicating that its source should be more enriched than group 1 and 3’s. It can be inferred that magma forming rocks of group 2 was derived from an asthenospheric mantle, while magma forming two other groups was resulted from a lithospheric mantle. Magmas forming dykes were generated by intermediate degrees of partial melting (about 7-20% and 12-20% for group 2 and 3 respectively). Source of magma was maybe a peridotite which was previously metasomatised. It is probable that the cause of metasomatism in the source was the subducted slab related to subduction of Neo-Tethys beneath the studied area. | ||
| کلیدواژهها | ||
| Basic dykes؛ Subduction؛ Trace elements؛ Golpayegan؛ Sanandaj-Sirjan Zone؛ Tectonic setting | ||
|
آمار تعداد مشاهده مقاله: 1,055 تعداد دریافت فایل اصل مقاله: 684 |
||