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http://hdl.handle.net/10773/21129
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DC Field | Value | Language |
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dc.contributor.author | Moghadam, H. S. | pt |
dc.contributor.author | Li, X. | pt |
dc.contributor.author | Santos, J. F. | pt |
dc.contributor.author | Stern, R. J. | pt |
dc.contributor.author | Griffin, W. L. | pt |
dc.contributor.author | Ghorbani, G. | pt |
dc.contributor.author | Sarebani, N. | pt |
dc.date.accessioned | 2017-12-13T09:57:06Z | - |
dc.date.issued | 2017-09-15 | - |
dc.identifier.issn | 0012-821X | pt |
dc.identifier.uri | http://hdl.handle.net/10773/21129 | - |
dc.description.abstract | Magmatic “flare-up” is common in the formation of continental arc roots. The best-studied examples of such flare-ups are known from Cretaceous and younger continental arcs, but more ancient examples are preserved in Late Ediacaran-Cambrian or Cadomian arcs that formed along the northern margin of Gondwana. In this paper, we report new trace-element, isotopic and geochronological data on Cadomian magmatic rocks from the Taknar complex, NE Iran, and use this information to better understand episodes of flare-up, crustal thickening and magmatic periodicity in the Cadomian arcs of Iran and Anatolia. Igneous rocks in the Taknar complex include gabbros, diorites, and granitoids, which grade upward into a sequence of metamorphosed volcano-sedimentary rocks with interlayered rhyolites. Granodioritic dikes crosscut the Taknar gabbros and diorites. Gabbros are the oldest units and have zircon U-Pb ages of ca 556 Ma. Granites are younger and have U-Pb zircon ages of ca 552-547 Ma. Rhyolites are coeval with the granites, with U-Pb zircon ages of ~551 Ma. Granodioritic dikes show two U-Pb zircon ages; ca 531 and 548 Ma. Geochemically, the Taknar igneous rocks have calc-alkaline signature typical of continental arcs. Whole-rock Nd and zircon O-Hf isotopic data from Taknar igneous rocks show that these rocks were generated via mixing of juvenile magmas with older continental-crust components at an active continental margin. Compiled geochronological and geochemical data from Iran and Anatolia allow identification of a long magmatic flare-up along northern Gondwana. The compiled U-Pb results from both magmatic and detrital zircons indicate a flare-up started ~572 Ma and ended ~ 528 Ma. The Cadomian flare-up was linked to strong crustal extension above a S-dipping subduction zone beneath northern Gondwana. The Iran-Anatolian Cadomian arc represents a site of crustal differentiation and stratification and involved older (Archean?) continental lower-middle crust, which has yet to be identified in situ, to form the continental nuclei of Anatolia and Iran. The Cadomian crust of Anatolia and Iran formed a single block “Cimmeria”, that rifted away from northern Gondwana and was accreted to southern Eurasia in late Paleozoic time. | pt |
dc.language.iso | eng | pt |
dc.publisher | Elsevier | pt |
dc.relation | Chinese Academy of Sciences (grants XDB18000000 and 2015VEC063) | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147458/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | Cadomianmagmatism | pt |
dc.subject | U–Pb zircon geochronology | pt |
dc.subject | Magmatic flare-up | pt |
dc.subject | Active continental magmatism | pt |
dc.subject | Gondwana | pt |
dc.title | Neoproterozoic magmatic flare-up along the N. Margin of Gondwana: The Taknar complex, NE Iran | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 83 | pt |
degois.publication.lastPage | 96 | pt |
degois.publication.title | Earth and Planetary Science Letters | pt |
degois.publication.volume | 474 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.identifier.doi | 10.1016/j.epsl.2017.06.028 | pt |
Appears in Collections: | DGeo - Artigos GeoBioTec - Artigos |
Files in This Item:
File | Description | Size | Format | |
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ShafaiiMoghadametal2017.pdf | Documento publicado | 2.11 MB | Adobe PDF |
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