Composition of volcanic rocks from the Alchan Basin, Northwestern Primorie ...

• Main Authors: Simanenko, V P, Golozubov, V V, Sakhno, V G
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Archive of Ocean Data ARCOD; Bear Island
• Online Access: https://dx.doi.org/10.1594/pangaea.788330; https://doi.pangaea.de/10.1594/PANGAEA.788330

Geological, petrochemical, and geochemical data are reported for volcanic rocks of a Cretaceous pull-apart basin in the Tan Lu strike-slip system, Asian continental margin. A comparison of these volcanic rocks with magmatic rocks from typical Cenozoic transform margins in the western North America and rift zones of Korea made it possible to distinguish some indicator features of transform-margin volcanic rocks. Magmatic rocks from strike-slip extension zones bear island-arc, intraplate, and occasionally depleted MORB geochemical signatures. In addition to calc-alkaline rocks there are bimodal volcanic series. The rocks are characterized by high K2O, MgO, and TiO2 contents. They show variable enrichment in LILE relative to HFSE, which is typical of island-arc magmas. At the same time they are rich in compatible transition elements, which is a characteristic of intraplate magmas. Trace element distribution patterns normalized to MORB or primitive mantle usually show a negative Ta-Nb anomaly typical of ... : Supplement to: Simanenko, V P; Golozubov, V V; Sakhno, V G (2006): Geochemistry of volcanic rocks from transform margins: evidence from the Alchan Basin, Northwestern Primorie. Translated from Geokhimiya, 2006, 12, 1251-1265, Geochemistry International, 44(12), 1157-1169 ...