We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Generation of Tholeiitic Magmas in the Interaction Zone of Evolving Ridge, Fracture Zone, and Plume: Evidence from Basalts in 332В Hole, DSDP Leg 37, North Atlantic.
- Authors
Sushchevskaya, N. M.; Dubinin, E. P.; Shcherbakov, V. D.; Belyatsky, B. V.; Zhilkina, A. V.
- Abstract
New petrogeochemical data (lithophile element contents and Sr, Nd and Pb isotope composition) on basalts recovered in the DSDP hole 332B in the 37° N region showed that the generation area of deep tholeiites 3 Ma experienced impact of the Azores plume. This led to the formation of tholeiites weakly enriched in a component compositionally similar to the enriched basalts of the Azores. In turn, sources of basaltic melts of the Azores Archipelago resemble those of enriched alkaline magmas of the Iberian margin, which were formed through melting of continental lithospheric fragments of Eurasia. Two types of olivines with different trace element fractionation trends (Ni, Co, Ca) were identified for the first time in the tholeiites from the DSDP hole 332B at the Azores Triple Junction (ATJ). The compositions of olivines with an elevated Ni content are close to those of the basalts of the Azores Archipelago and indicate the presence of lithospheric mantle fragments in the area of tholeiitic magma generation. The observed global and local compositional mantle heterogeneities could have arisen from the complex geodynamic evolution of the ATJ, the formation of which was accompanied by the impact of the Azores plume near fracture zone, spreading axis jumping, and the involvement of continental lithospheric fragments in melting.
- Subjects
AZORES; MAGMAS; BASALT; OLIVINE; CHALCOGENS; TRACE elements
- Publication
Geochemistry International, 2021, Vol 59, Issue 10, p903
- ISSN
0016-7029
- Publication type
Article
- DOI
10.1134/S0016702921090068