Ultramafic–Mafic Assemblage of Plutonic Rocks and Hornblende Schists of Shirshov Rise,Bering Sea,and Stalemate Ridge,Northwest Pacific: Geodynamic Interpretations of Geochemical Data     

S. A. Silantyev  I. V. Kubrakova  M. V. Portnyagin  O. A. Tyutyunnik  A. V. Zhilkina  A. S. Gryaznova  K. Hoernle  R. Werner 《Petrology》2018,26(5):492-514

The paper presents data on plutonic and metamorphic rocks dredged during Cruise 249 of the German R/V Sonne to the Stalemate Ridge, Northwest Pacific Ocean and the Shirshov Rise, western Bering Sea. Dredges in the northwestern sector of the Stalemate Ridge and central portion of the Shirshov Rise show that the plutonic and metamorphic rocks obtained here are amazingly similar. Our petrologic and geochemical data led us to view the rocks as members of a mafic–ultramafic assemblage typical of cumulate portions of ophiolite complexes and backarc spreading centers. The plutonic complexes of the Shirshov Rise and Stalemate Ridge show similarities not only in the petrography and mineralogy of their protoliths but also in the character of their metamorphic transformations. Plutonic rocks from both areas display mineralogical evidence of metamorphism within a broad temperature range: from the high-temperature amphibolite facies to the greenschist facies. Relations between the index mineral assemblages indicate that the metamorphic history of plutonic complexes in the Stalemate Ridge and Shirshov Rise proceeded along a retrograde path. Hornblende schists accompanying the plutonic rocks of the Stalemate Ridge and Shirshov Rise are petrographically close to foliated amphibolites in subophiolitic metamorphic aureoles. Within the framework of geodynamic interpretations of our results, it is realistic to suggest that the examined plutonic complexes were exhumed from subduction zones of various age.  相似文献   

New Data on the Structure of the Megatransform System of the Doldrums (Central Atlantic)     

Skolotnev  S. G.  Sanfilippo  A.  Peyve  A. A.  Muccini  F.  Sokolov  S. Yu.  Sani  C.  Dobroliubova  K. O.  Ferrando  C.  Chamov  N. P.  Pertsev  A. N.  Gryaznova  A. S.  Sholukhov  K. N.  Bich  A. S. 《Doklady Earth Sciences》2020,491(1):131-134

Doklady Earth Sciences - The geological and geophysical data acquired during cruise 45 of R/V Akademik Nikolaj Strakhov regarding the structure of the Doldrums megatransform system in the Central...  相似文献   

Multidisciplinary Investigation of the Transform Fault Zones Doldrums and Vema during Cruise 45 of the R/V “Akademik Nikolaj Strakhov”     

Ivanova  E. V.  Skolotnev  S. G.  Borisov  D. G.  Demidov  A. N.  Bich  A. S.  Gippius  F. N.  Gryaznova  A. S.  Dobroliubova  K. O.  Zinger  T. F.  Korshunov  D. M.  Levchenko  O. V.  Mashura  V. V.  Muccini  F.  Nemchenko  N. V.  Peyve  A. A.  Pertsev  A. N.  Sani  K.  Sanfilippo  A.  Simagin  N. V.  Sokolov  S. Yu.  Ferrando  C.  Chamov  N. P.  Shakhovskoy  I. B.  Sholukhov  K. N. 《Oceanology》2020,60(3):424-426

Oceanology - Herein we provide information on the integrated geological, geophysical, sedimentological, paleoceanographic, hydrophysical and biological investigations in the Central Atlantic during...  相似文献