Geochemistry and geochronology of Middle Eocene subduction-related felsic volcanics in the Misis-Andirin Complex of the Southeast Anatolian Orogenic Belt.
| Title: | Geochemistry and geochronology of Middle Eocene subduction-related felsic volcanics in the Misis-Andirin Complex of the Southeast Anatolian Orogenic Belt. |
|---|---|
| Authors: | Nurlu, Nusret, Akinci, Ahmet Can, Kohút, Milan |
| Source: | Geosciences Journal; Dec2023, Vol. 27 Issue 6, p689-710, 22p |
| Subject Terms: | VOLCANOLOGY, GEOCHEMISTRY, GEOLOGICAL time scales, FELSIC rocks, EOCENE Epoch, CESIUM isotopes, OROGENIC belts, GEODYNAMICS |
| Abstract: | LA-ICP-MS zircon geochronology and geochemistry (whole-rock & mineral chemistry) from the Misis-Andirin Complex (MAC) volcanic rocks are reported. The MAC records magmatic, sedimentary, and tectonic processes operating at the northern active margin of the Neotethys (South Tethys) in the eastern Mediterranean district. The MAC represents an association of an originally active continental margin including the Engizek (in the NE), Andirin (central) and Misis (in the SW) segments. The felsic extrusives are depleted in HFSE (high-field-strength elements), enriched in LILE (large-ion lithophile elements) and have flat-type REE patterns; these trends and also biotite chemistry verify their supra-subduction zone tectonic environment. The studied volcanic unit consists of mainly rhyolite, dacite and rare andesite rocks, and is intercalated with Bulgurkaya Formation. These felsic extrusive rocks show relative depletions in Ti + Nb, and partial enrichment in Cs, Rb, Ba, and Th in the N-MORB (normal-mid ocean ridge basalt) normalized spider plot, suggesting their derivation from a supra-subduction geodynamic environment. The La/Nb (1.92–2.33) and Nb/Th (1.0–1.12) ratios of all the analysed extrusives from Andirin region present arc magmas or volcanic rocks affinity that could have been contributed by crustal source contents and also examined volcanics yield nearly flat Ba/La ratios with relatively increasing Th/Yb, suggesting the contribution of sediments or crustal contamination. The Al-in-hornblende thermobarometry (2.04 to 1.55 kbar) of Mg-Fe hornblende in the volcanics of the MAC represents their crystallization of amphibole in the moderate to shallow crustal level at a maximum 6.7 km to a minimum 5.1 km depth. The ilmenite-magnetite thermometer based on Fe-Ti oxide equilibria shows that the Andirin region felsic magmas were at 717 °C and at an fO |
| Copyright of Geosciences Journal is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Complementary Index |
| FullText | Text: Availability: 0 CustomLinks: – Url: https://resolver.ebsco.com/c/xy5jbn/result?sid=EBSCO:edb&genre=article&issn=12264806&ISBN=&volume=27&issue=6&date=20231201&spage=689&pages=689-710&title=Geosciences Journal&atitle=Geochemistry%20and%20geochronology%20of%20Middle%20Eocene%20subduction-related%20felsic%20volcanics%20in%20the%20Misis-Andirin%20Complex%20of%20the%20Southeast%20Anatolian%20Orogenic%20Belt.&aulast=Nurlu%2C%20Nusret&id=DOI:10.1007/s12303-023-0027-4 Name: Full Text Finder (for New FTF UI) (s8985755) Category: fullText Text: Find It @ SCU Libraries MouseOverText: Find It @ SCU Libraries |
|---|---|
| Header | DbId: edb DbLabel: Complementary Index An: 173557297 RelevancyScore: 993 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 992.998962402344 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Geochemistry and geochronology of Middle Eocene subduction-related felsic volcanics in the Misis-Andirin Complex of the Southeast Anatolian Orogenic Belt. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Nurlu%2C+Nusret%22">Nurlu, Nusret</searchLink><br /><searchLink fieldCode="AR" term="%22Akinci%2C+Ahmet+Can%22">Akinci, Ahmet Can</searchLink><br /><searchLink fieldCode="AR" term="%22Kohút%2C+Milan%22">Kohút, Milan</searchLink> – Name: TitleSource Label: Source Group: Src Data: Geosciences Journal; Dec2023, Vol. 27 Issue 6, p689-710, 22p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22VOLCANOLOGY%22">VOLCANOLOGY</searchLink><br /><searchLink fieldCode="DE" term="%22GEOCHEMISTRY%22">GEOCHEMISTRY</searchLink><br /><searchLink fieldCode="DE" term="%22GEOLOGICAL+time+scales%22">GEOLOGICAL time scales</searchLink><br /><searchLink fieldCode="DE" term="%22FELSIC+rocks%22">FELSIC rocks</searchLink><br /><searchLink fieldCode="DE" term="%22EOCENE+Epoch%22">EOCENE Epoch</searchLink><br /><searchLink fieldCode="DE" term="%22CESIUM+isotopes%22">CESIUM isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22OROGENIC+belts%22">OROGENIC belts</searchLink><br /><searchLink fieldCode="DE" term="%22GEODYNAMICS%22">GEODYNAMICS</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: LA-ICP-MS zircon geochronology and geochemistry (whole-rock & mineral chemistry) from the Misis-Andirin Complex (MAC) volcanic rocks are reported. The MAC records magmatic, sedimentary, and tectonic processes operating at the northern active margin of the Neotethys (South Tethys) in the eastern Mediterranean district. The MAC represents an association of an originally active continental margin including the Engizek (in the NE), Andirin (central) and Misis (in the SW) segments. The felsic extrusives are depleted in HFSE (high-field-strength elements), enriched in LILE (large-ion lithophile elements) and have flat-type REE patterns; these trends and also biotite chemistry verify their supra-subduction zone tectonic environment. The studied volcanic unit consists of mainly rhyolite, dacite and rare andesite rocks, and is intercalated with Bulgurkaya Formation. These felsic extrusive rocks show relative depletions in Ti + Nb, and partial enrichment in Cs, Rb, Ba, and Th in the N-MORB (normal-mid ocean ridge basalt) normalized spider plot, suggesting their derivation from a supra-subduction geodynamic environment. The La/Nb (1.92–2.33) and Nb/Th (1.0–1.12) ratios of all the analysed extrusives from Andirin region present arc magmas or volcanic rocks affinity that could have been contributed by crustal source contents and also examined volcanics yield nearly flat Ba/La ratios with relatively increasing Th/Yb, suggesting the contribution of sediments or crustal contamination. The Al-in-hornblende thermobarometry (2.04 to 1.55 kbar) of Mg-Fe hornblende in the volcanics of the MAC represents their crystallization of amphibole in the moderate to shallow crustal level at a maximum 6.7 km to a minimum 5.1 km depth. The ilmenite-magnetite thermometer based on Fe-Ti oxide equilibria shows that the Andirin region felsic magmas were at 717 °C and at an fO<subscript>2</subscript> of approximately 2.16 log units (+1.51 NNO). The MAC extrusive volcanic rocks were produced throughout the Eocene period, and our new U-Pb zircon dating (47.13 ± 0.5 Ma) confirmed mainly younger Lutetian age of the volcanic activity in the Andirin area. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Geosciences Journal is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://login.libproxy.scu.edu/login?url=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edb&AN=173557297 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12303-023-0027-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 689 Subjects: – SubjectFull: VOLCANOLOGY Type: general – SubjectFull: GEOCHEMISTRY Type: general – SubjectFull: GEOLOGICAL time scales Type: general – SubjectFull: FELSIC rocks Type: general – SubjectFull: EOCENE Epoch Type: general – SubjectFull: CESIUM isotopes Type: general – SubjectFull: OROGENIC belts Type: general – SubjectFull: GEODYNAMICS Type: general Titles: – TitleFull: Geochemistry and geochronology of Middle Eocene subduction-related felsic volcanics in the Misis-Andirin Complex of the Southeast Anatolian Orogenic Belt. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Nurlu, Nusret – PersonEntity: Name: NameFull: Akinci, Ahmet Can – PersonEntity: Name: NameFull: Kohút, Milan IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 12264806 Numbering: – Type: volume Value: 27 – Type: issue Value: 6 Titles: – TitleFull: Geosciences Journal Type: main |
| ResultId | 1 |