K/AR AGE DATING OF OSHNAVIYEH PLUTONIC COMPLEX

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GHALAMGHASH J.; VOSOUGHI ABEDINI M.; BELLON H.; EMAMI MOHAMMAD HASHEM; POURMAFI M.; RASHID H.

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Journal: GEOSCIENCES Year:2003 | Volume:11 | Issue:47-48 Page(s): 16-27

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Title

K/AR AGE DATING OF OSHNAVIYEH PLUTONIC COMPLEX

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Keywords

PLUTONIC COMPLEXQ3

K/AR AGE DATINGQ4

GRANITEQ2

SYENITEQ4

OSHNAVIEHQ2

IRANQ2

Abstract

Oshnaviych PLUTONIC COMPLEX (OPC), the western member of Urumiyeh-Golpayehgan intrusivc plutons is located in northern part of Sanandaj-Sirjan Zone. OPC, exposing in an area of about 700 km2, comprises 10 plutons that can be divided into three suites, i.e. diorite, GRANITE and alkali SYENITE -alkali GRANITE, Dioritic bodies are thc oldest intrusive rocks of the region, which on the basis of the field study, their relative age of emplacement is estimated to be Post- Jurassic and Pre-Miocene. However, with respect to the age of other similar intrusive bodies in Naghadeh area, they are most likely of Post Early Cretaccous - Pre Miocene age, Hybrid intrusive rocks, occurring at the contact of dioritic and granitie rocks may suggest a simultaneous emplacement of both magmas. Syenitic pluton from alkali GRANITE-alkali GRANITE suite has intruded dioritic and granitie rocks, in contrast, flourine bearing alkali GRANITE pluton from this suite shows no contact with other igneous rocks in the area. K-Ar age determinations obtained on amphibole specimens from diorite suite are 91.9±2.3, 94.1±2.3 and 100±2.4 Ma, and on biotite specimens from GRANITE suite are 100±1.5 to 98.9±1.5 Ma. Chronology study using same method on arfvedsonite specimens from SYENITE pluton shows 78.9±3.1, 79.6±1.9 and 81.7±2.0 Ma and on K-fledspar samples of fluorine bearing alkali GRANITE pluton from the alkali SYENITE-alkali GRANITE suite presents 76±3.4 and 77.1±1.8. Therefore, based on field evidence and K/AR AGE DATING, OPC presumably formed during two episodes: GRANITE and diorite suites formed simultaneously at about 100 Ma, then plutons of alkali SYENITE-alkali GRANITE suite emplaced at about 80 Ma.

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APA: Copy

GHALAMGHASH, J., VOSOUGHI ABEDINI, M., BELLON, H., EMAMI, MOHAMMAD HASHEM, POURMAFI, M., & RASHID, H.. (2003). K/AR AGE DATING OF OSHNAVIYEH PLUTONIC COMPLEX. GEOSCIENCES, 11(47-48), 16-27. SID. https://sid.ir/paper/31712/en

Vancouver: Copy

GHALAMGHASH J., VOSOUGHI ABEDINI M., BELLON H., EMAMI MOHAMMAD HASHEM, POURMAFI M., RASHID H.. K/AR AGE DATING OF OSHNAVIYEH PLUTONIC COMPLEX. GEOSCIENCES[Internet]. 2003;11(47-48):16-27. Available from: https://sid.ir/paper/31712/en

IEEE: Copy

J. GHALAMGHASH, M. VOSOUGHI ABEDINI, H. BELLON, MOHAMMAD HASHEM EMAMI, M. POURMAFI, and H. RASHID, “K/AR AGE DATING OF OSHNAVIYEH PLUTONIC COMPLEX,” GEOSCIENCES, vol. 11, no. 47-48, pp. 16–27, 2003, [Online]. Available: https://sid.ir/paper/31712/en

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