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oai:docta.ucm.es:20.500.14352/714972023-08-11T07:01:11Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Álvaro, J.J. author Ghobadi Pour, Mansoureh author Sánchez García, Teresa author Kebria-ee Zadeh, Mohammad-Reza author Hairapetian, Vachik author Popov, Leonid E. 2023-06-22T10:43:13Z 2023-06-22T10:43:13Z 2022-08-01 1367-9120 10.1016/j.jseaes.2022.105240 https://hdl.handle.net/20.500.14352/71497 https://doi.org/10.1016/j.jseaes.2022.105240 Recent reconnaissance geological mapping, identification of unconformities and chronostratigraphic dating of Miaolingian to Ordovician strata in the eastern Alborz Mountains have led to recognition of synsedimentary uplift episodes associated with block tilting and partial erosion of the Cambrian Mila and Ordovician Simeh Kuh, Qumes and Lashkarak formations. A chronostratigraphic revision of the Miaolingian-Late Ordovician fossil content is presented, and the Steptoean Positive Carbon Isotope Excursion (SPICE) chemostratigraphic shift, marking the Miaolingian–Furongian boundary, is constrained close to the Members 2/3 contact of the Mila Formation. Upper Ordovician basaltic lava flows embedded in the Abarsaj Formation and Devonian sills and dykes intruded in the Mila and Simeh-Kuh formations were geochemically analysed and compared with the voluminous lava eruptions recognized in the Katian-Llandovery Soltan-Maidan and Gorgan Schists formations, and in the ?Emsian-Eifelian Mighan Formation. They represent successive magmatic pulses of alkaline to subalkaline activities, separated by background (quiescent) intervals of up to 35 m.y., characterizing an intraplate field (continental rift) affinity compatible with OIB-like (ΔNb greater than 0) mantle sources. Successive Miaolingian-Mid Ordovician (volcanic-free) uplift episodes were related to lithospheric doming preceding the onset of stepwise plume-related rift pulses, which shaped a large igneous province with transects of about 600 km, linking the Damghan and Alestan domains of the eastern Alborz Mountains with South Kopet-Dagh and some blocks of Central Iran. eng Stratigraphic and volcanic signatures of Miaolingian-Late Ordovician rift pulses in the Alborz Mountains, northern Iran journal article URL https://docta.ucm.es/bitstreams/491d9f5b-a68f-4600-ac23-01719411c3aa/download File MD5 041211a706ff01cd1ba9e05a3bf77dca 30747645 application/pdf Stratigraphic and volcanic signatures of Miaolingian-Late Ordovician rift pulses in the Alborz Mountains, northern Iran.pdf URL https://docta.ucm.es/bitstreams/581baf75-a103-49d3-964b-13f4ff7efeeb/download File MD5 aec4b4181ef9b1df59570cc2e2020f3e 192669 text/plain Stratigraphic and volcanic signatures of Miaolingian-Late Ordovician rift pulses in the Alborz Mountains, northern Iran.pdf.txt