Abstract
The paper presents the first data on the Sr and Nd isotope composition of rocks from a unique collection of magmatic rocks of all petrographic types (basalts, gabbro, and peridotites) belonging to the lithosphere at the convergent plate boundary in the Aleutian Arc area. The rock samples were collected over large areas in the Northwest Pacific and Bering Sea. The results of this study provide reliable information on the geodynamic nature of the central segment of the Shirshov Rise, which is made up of magmatic rocks whose isotopic–geochemical features indicate that they were produced by magmatic melts that evolved within the crust and were derived by the partial melting of MORB parental source, which may have belonged to a mantle wedge. The isotopic–geochemical characteristics of the rocks at the Shirshov Rise suggest that the mafic–ultramafic rocks association may have been produced at a backarc spreading center. Petrological and isotopic–geochemical traits of rocks dredged at the northwestern flank of the Stalemate Ridge indicate that the sources of the parental melts were heterogeneous. Data on the rocks suggest that magmatism in this part of the Northwest Pacific may have involved a source responsible for the origin of the oldest seamounts in the Hawaiian–Emperor Volcanic Chain. Ultramafic rocks in the northwestern segment of the Stalemate Ridge show similarities with plutonic rocks found as xenoliths in volcanics of the Aleutian Island Arc. With regard for the scarcity of information on the structure of the lithosphere in this part of the Pacific, it can be cautiously suggested that the oceanic slope of the Aleutian Trench and adjacent segment of the Stalemate Ridge involve fragments of the basement of the Aleutian Island Arc.
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Notes
Here and below, the numbers of the dredge sites are quoted with specifying the number of the cruise, whereas the numbers of rock sample specify only the number of the dredge.
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ACKNOWLEDGMENTS
The authors thank M.V. Portnyagin (Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences; GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany), K. Hernle, and R. Werner (GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany) for close cooperation during Cruises 201 and 249 of the R/V Sonne and for fruitful discussion of the results.
Funding
This study was supported by the Russian Foundation for Basic Research, project no. 18-05-00001a, and government-financed Project 0137-2018-0004 “Problems of the Origin and Evolution of the Oceanic and Continental Lithosphere”. Cruises S0201 and So249 were conducted under Projects KALMAR (in 2009) and BERING (in 2016), which were supported by the Ministry for Science and Education of Germany.
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Silantyev, S.A., Kostitsyn, Y.A., Shabykova, V.V. et al. Geodynamic Nature of Magmatic Sources in the Northwest Pacific: An Interpretation of Data on the Sr and Nd Isotope Composition of Rocks Dredged at the Stalemate Ridge, Ingenstrem Depression, and Shirshov Rise. Petrology 27, 655–674 (2019). https://doi.org/10.1134/S0869591119060079
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DOI: https://doi.org/10.1134/S0869591119060079