Magmatism of the eastern Red Sea margin in the northern part of Yemen from Oligocene to present

Manetti, P, Capaldi, G, Chiesa, S, Civetta, L, Conticelli, S, Gasparon, M, Lavolpe, L and Orsi, G (1991) Magmatism of the eastern Red Sea margin in the northern part of Yemen from Oligocene to present. Tectonophysics, 198 2-4: 181-202. doi:10.1016/0040-1951(91)90150-Q


Author Manetti, P
Capaldi, G
Chiesa, S
Civetta, L
Conticelli, S
Gasparon, M
Lavolpe, L
Orsi, G
Title Magmatism of the eastern Red Sea margin in the northern part of Yemen from Oligocene to present
Journal name Tectonophysics   Check publisher's open access policy
ISSN 0040-1951
Publication date 1991-11-20
Sub-type Article (original research)
DOI 10.1016/0040-1951(91)90150-Q
Volume 198
Issue 2-4
Start page 181
End page 202
Total pages 22
Language eng
Subject 1904 Performing Arts and Creative Writing
1908 Geophysics
Abstract The northern part of Yemen during the last 30 Ma has been the site of an intense magmatic activity which can be divided into three main episodes. The first episode lasted from 30 to 18 Ma and was characterized by two climaxes. Huge flood basalt eruptions between 30 to 26 Ma were succeeded by massive ignimbrite sheet deposits and intrusion of silicic subvolcanic masses 22 to 20 Ma ago. Contemporaneously, along the present-day western margin of the Yemen Plateau a basaltic dike swarm was emplaced. Additionally, alkaline and peralkaline granites were intruded at the end of the first climax and throughout the second. After a long quiescence, magmatic activity occurred again in Late Miocene time (about 10 Ma) with extrusion of lava flows in scattered areas (e.g. Al Harf, Wadi As Sirr, Maswar Al Hada, Jabal An Nar). The third magmatic episode has been concentrated in three well defined areas. It began about 6.5 Ma ago in the Dhamar Rada area and later in the San'a Amram and Sirwah Marib areas. New chemical and isotopic data on the magmatic products of North Yemen indicate that extensive crustal contamination, together with simple crystal fractionation processes, have been operating during the magmatic evolution. The most primitive products of each of the three episodes share isotopic and petrological features suggesting a similar mantle source. Isotope geochemistry indicates an important asthenospheric component in the mantle source for the magmas of all three episodes. Finally, a comparison between the coeval igneous rocks of the Yemen and Ethiopia plateaus is attempted.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 02 Feb 2016, 16:19:41 EST by Associate Professor Massimo Gasparon