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Journal: Earth Science

Abbreviation

Publisher

China University of Geosciences Press

Journal Volumes

ISSN

1000-2383

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20251
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Publications 1 - 1 of 1
  • Sedimentary Records of Volcanic Activity in Paleogene of Alps and Geological Significance
    Item type: Journal Article
    Lu, Gang; Gao, Liang; Wang, Changcheng; et al. (2025)
    Earth Science
    During the Middle Eocene to Early Oligocene, the collision between the European and Adriatic plates led to large-scale magmatic activity in the Alpine orogenic belt, and pyroclastic rocks were recorded in the back arc basin. This study focuses on the geochronology and geochemistry of pyroclastic rocks, and reveals the volcanic activity and structural evolution characteristics of the Alpine orogenic belt. The results indicate that the peak ages of zircons in pyroclastic rocks are mainly concentrated at ~47 Ma, 40 Ma, and 37 Ma. The Hf isotopes of zircons show negative values. It indicates that they were mainly formed in magma with partially melted crust during plate subduction. In addition, the crustal thickness was calculated by using magmatic zircon isotopes. It is demonstrated that the Alpine orogenic belt experienced not only vertical crustal compression thickening caused by plate subduction and collision, but also crustal extension thinning caused by plate stretching.
Publications 1 - 1 of 1