Carboniferous mafic-ultramafic intrusions in the Eastern Pontides (Pulur Complex): implications for the source of coeval voluminous granites
This study deals with the age and petrogenesis of mafic-ultramafic intrusions ranging in size from a few meters to 10 km within the Early Carboniferous high-grade gneisses of the Pulur Complex in the Eastern Pontides. The intrusions comprise dunite, wehrlite, gabbronorite, leucogabbro, anorthosite a...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
January 2023
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| In: |
Lithos
Year: 2023, Volume: 436-437, Pages: 1-17 |
| ISSN: | 1872-6143 |
| DOI: | 10.1016/j.lithos.2022.106946 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.lithos.2022.106946 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0024493722003553 
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| Author Notes: | Gültekin Topuz, Rainer Altherr, Osman Candan, Jia-Min Wang, Aral I. Okay, Fu-Yuan Wu, Ali Ergen, Thomas Zack, Wolfgang Siebel, Cosmas K. Shangh, Winfried H. Schwarz, Hans-Peter Meyer, Muharrem Satır |
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| 245 | 1 | 0 | |a Carboniferous mafic-ultramafic intrusions in the Eastern Pontides (Pulur Complex) |b implications for the source of coeval voluminous granites |c Gültekin Topuz, Rainer Altherr, Osman Candan, Jia-Min Wang, Aral I. Okay, Fu-Yuan Wu, Ali Ergen, Thomas Zack, Wolfgang Siebel, Cosmas K. Shangh, Winfried H. Schwarz, Hans-Peter Meyer, Muharrem Satır |
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| 520 | |a This study deals with the age and petrogenesis of mafic-ultramafic intrusions ranging in size from a few meters to 10 km within the Early Carboniferous high-grade gneisses of the Pulur Complex in the Eastern Pontides. The intrusions comprise dunite, wehrlite, gabbronorite, leucogabbro, anorthosite and ilmenite-bearing gabbronorite of cumulus origin, and are crosscut by dikes of ilmenite-bearing gabbronorite, leucogranite and microdiorite. U-Pb dating on zircons from gabbronorite, anorthosite and leucogranite yielded igneous crystallization ages of 322-326 Ma, indicating that the intrusions were emplaced ca. 5-7 Ma after the peak of high-grade metamorphism, and form part of the Late Carboniferous high-volume magmatism in the region. In most cumulate rocks, Cr-Al spinel, olivine and plagioclase were early crystallizing phases, followed by orthopyroxene, clinopyroxene and hornblende. Whole rock geochemical data suggest that wehrlite, gabbronorite, leucogabbro and anorthosite stem from a common magma, and ilmenite-bearing gabbronorite and dikes of leucogranite and microdiorite from different magmas. Application of mineral/melt partition coefficients to trace element compositions of clinopyroxene and hornblende in cumulate rocks suggests that the main cumulate body was derived from middle- to high-K calc-alkaline basic melts, and relatively late ilmenite-bearing gabbronorites from hypersthene-normative Ca-rich melts. All the rock types display radiogenic Sr and Pb isotopic signatures, and unradiogenic Nd isotopic ratios, which are indistinguishable from those of the coeval voluminous high-K calc-alkaline I-type granites in the region; the isotopic ratios are probably related to the metasomatism of the lithospheric mantle by sediment-derived melts. We suggest that the parental melts of the mafic-ultramafic intrusions and those of the high-K calc-alkaline granites were genetically related, and melts of the high-K calc-alkaline granites were probably derived from the melting of newly underplated calc-alkaline basic material at lower crustal depths, that were compositionally comparable to the parental magmas of the mafic-ultramafic intrusions. | ||
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| 650 | 4 | |a High-K calc-alkaline granite | |
| 650 | 4 | |a High-volume magmatism | |
| 650 | 4 | |a Isotopic dating | |
| 650 | 4 | |a Mafic-ultramafic intrusion | |
| 650 | 4 | |a Sakarya Zone, Turkey | |
| 650 | 4 | |a Variscan orogeny, Pulur | |
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| 700 | 1 | |a Siebel, Wolfgang |e VerfasserIn |4 aut | |
| 700 | 1 | |a Shangh, Cosmas K. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Schwarz, Winfried H. |e VerfasserIn |4 aut | |
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