Petrographic and geochemical characteristics of Eocene (?) basic igneous rocks outcropping around Gülümuşağı (Malatya)

Abdullah Sar

Article Details

Petrographic and geochemical characteristics of Eocene (?) basic igneous rocks outcropping around Gülümuşağı (Malatya)

Authors:

Abdullah Sar

Publisher:

Gumushane University

Main Topics:

Mineraloji-Petrografi

Journal:

Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.14 Issue 3, pp.706-720

Document Type:

Article

Publication Date:

9/2024

Document Language:

Turkish

Document ID (Org No.):

2001326545

pISSN:

2146-538X

Keywords:

Abstract:

 Eocene ? aged magmatic rocks cropping out around Gülümuşağı in Malatya province in the Southeastern Anatolian Orogenic Belt SAOB are in the composition of gabbro and diorite and petrographically consist of plagioclase, pyroxene and amphibole minerals. The gabbros and diorites under investigation have low-medium K character, negative trends in Rb, P, Nb and Ti elements, and positive trends in Sr and Ba values in the trace element diagram normalized according to the Primary Mantle. It shows an almost horizontal trend in the trace element variation diagram normalized according to chondrite. The LaNLuN ratios between light rare earth elements LREE and heavy rare earth elements HREE in the gabbros and diorites under investigation vary between 1.31 and 1.53 AS170.53, AS205.35 and show weak-medium levels of fractionation. Gabbro and diorite-type rocks show positive Eu anomalies, and EuNEu values vary between 1.01-1.46. Gabbro and diorites have relatively low LaYb 0.63-6.31 and NbLa 0.42-0.75 ratios, indicating lithospheric mantlelithospheric-asthenospheric mantle origin. Low ZrHf 12.6-39.3 and NbYb 0.31-3.26 ratios suggest that these rocks are formed from a depleted mantle source. The role of fractional crystallization is greater than assimilation in developing the main magma that forms the gabbros and diorites under investigation. In light of all the data, it is thought that the main magma of Eocene ? aged gabbros and diorites was derived from a source containing spinel representing shallow depths.

 Eocene ? aged magmatic rocks cropping out around Gülümuşağı in Malatya province in the Southeastern Anatolian Orogenic Belt SAOB are in the composition of gabbro and diorite and petrographically consist of plagioclase, pyroxene and amphibole minerals. The gabbros and diorites under investigation have low-medium K character, negative trends in Rb, P, Nb and Ti elements, and positive trends in Sr and Ba values in the trace element diagram normalized according to the Primary Mantle. It shows an almost horizontal trend in the trace element variation diagram normalized according to chondrite. The LaNLuN ratios between light rare earth elements LREE and heavy rare earth elements HREE in the gabbros and diorites under investigation vary between 1.31 and 1.53 AS170.53, AS205.35 and show weak-medium levels of fractionation. Gabbro and diorite-type rocks show positive Eu anomalies, and EuNEu values vary between 1.01-1.46. Gabbro and diorites have relatively low LaYb 0.63-6.31 and NbLa 0.42-0.75 ratios, indicating lithospheric mantlelithospheric-asthenospheric mantle origin. Low ZrHf 12.6-39.3 and NbYb 0.31-3.26 ratios suggest that these rocks are formed from a depleted mantle source. The role of fractional crystallization is greater than assimilation in developing the main magma that forms the gabbros and diorites under investigation. In light of all the data, it is thought that the main magma of Eocene ? aged gabbros and diorites was derived from a source containing spinel representing shallow depths.

 Eocene ? aged magmatic rocks cropping out around Gülümuşağı in Malatya province in the Southeastern Anatolian Orogenic Belt SAOB are in the composition of gabbro and diorite and petrographically consist of plagioclase, pyroxene and amphibole minerals. The gabbros and diorites under investigation have low-medium K character, negative trends in Rb, P, Nb and Ti elements, and positive trends in Sr and Ba values in the trace element diagram normalized according to the Primary Mantle. It shows an almost horizontal trend in the trace element variation diagram normalized according to chondrite. The LaNLuN ratios between light rare earth elements LREE and heavy rare earth elements HREE in the gabbros and diorites under investigation vary between 1.31 and 1.53 AS170.53, AS205.35 and show weak-medium levels of fractionation. Gabbro and diorite-type rocks show positive Eu anomalies, and EuNEu values vary between 1.01-1.46. Gabbro and diorites have relatively low LaYb 0.63-6.31 and NbLa 0.42-0.75 ratios, indicating lithospheric mantlelithospheric-asthenospheric mantle origin. Low ZrHf 12.6-39.3 and NbYb 0.31-3.26 ratios suggest that these rocks are formed from a depleted mantle source. The role of fractional crystallization is greater than assimilation in developing the main magma that forms the gabbros and diorites under investigation. In light of all the data, it is thought that the main magma of Eocene ? aged gabbros and diorites was derived from a source containing spinel representing shallow depths.

 Güneydoğu Anadolu Orojenik Kuşağında GAOK Malatya ili Gülümuşağı çevresinde yüzeyleyen Eosen ? yaşlı magmatik kayaçlar gabro ve diyorit bileşiminde olup petrografik olarak plajiyoklaz, piroksen ve amfibol minerallerinden oluşmaktadır. İnceleme konusu gabro ve diyoritler düşük-orta K karakterine sahip olup ilksel mantoya göre normalize edilmiş iz element diyagramında Rb, P, Nb ve Ti elementlerinde negatif gidişler, Sr ve Ba değerlerinde pozitif yönsemelere sahiptir. Kondrite göre normalize edilmiş iz element değişim diyagramında yataya yakın bir gidiş göstermektedir. İnceleme konusu gabro ve diyoritler hafif nadir toprak elementleri HNTE ve ağır nadir toprak elementleri ANTE arasında LaNLuN oranları 1.31 ile 1.53 arasında değişmekte AS170.53, AS205.35 olup zayıf-orta seviyelerde fraksiyonlaşma göstermektedir. Gabro ve diyorit türü kayaçlar pozitif Eu anomalileri göstermekte olup, EuNEu değerleri 1.01-1.46 aralığında değişmektedir. Gabro ve diyoritler kısmen düşük LaYb 0.63-6.31 ve NbLa 0.42-0.75 oranlarına sahip olup litosferik mantolitosferik-astenosferik manto kökenine işaret etmektedir. Düşük ZrHf 12.6-39.3 ve NbYb 0.31-3.26 oranları bu kayaçların tüketilmiş bir manto kaynağından oluştuğunu göstermektedir. Gabro ve diyoritleri oluşturan ana magmanın gelişiminde fraksiyonel kristallenmenin rolü asimilasyona göre daha fazladır. Tüm veriler ışığında, Eosen ? yaşlı gabro ve diyoritlerin ana magmasının sığ derinlikleri temsil eden spinel içeren bir kaynaktan türediği düşünülmektedir.

Article Details

Petrographic and geochemical characteristics of Eocene (?) basic igneous rocks outcropping around Gülümuşağı (Malatya)

Authors:

Abdullah Sar

Publisher:

Gumushane University

Main Topics:

Mineraloji-Petrografi

Journal:

Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.14 Issue 3, pp.706-720

Document Type:

Article

Publication Date:

9/2024

Document Language:

Turkish

Document ID (Org No.):

2001326545

pISSN:

2146-538X

Gülümuşağı

Gabbro/diorite

Geochemistry

Petrography

PetrogenesisGülümuşağı

Gabro/diyorit

Jeokimya

Petrografi

Petrojenez

Issues

Article Details

Authors: Abdullah Sar

Publisher: Gumushane University

Main Topics: Mineraloji-Petrografi

Journal: Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.14 Issue 3, pp.706-720

Document Type: Article

Publication Date: 9/2024

Document Language: Turkish

Document ID (Org No.): 2001326545

pISSN: 2146-538X

Issues

Authors:

Abdullah Sar

Publisher:

Gumushane University

Main Topics:

Mineraloji-Petrografi

Journal:

Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.14 Issue 3, pp.706-720

Document Type:

Article

Publication Date:

9/2024

Document Language:

Turkish

Document ID (Org No.):

2001326545

pISSN:

2146-538X