Petrogenesis and its significance to continental dynamics of the Neogene high-potassium calc-alkaline volcanic rock association from North Qiangtang, Tibetan Plateau

Lai Shaocong*, Liu Chiyang, S. Y. O'Reilly

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Detailed studies indicate that the main rock type of the Neogene high-potassium calc-alkaline volcanic rock association from north Qiangtang is andesite, dacite and rhyolite. They belong to typical crust-generation magmatic system and originate from the special thickened crust of the Tibetan Plateau by dehydration melting. This group of rocks exhibits LREE enrichment but no remarkable Eu anomaly that shows their source region should be a thickened deep crust consisting of eclogitic mass group, implying that the crust had been thickened and an eclogitic deep crust had been formed during the Neogene period in Qiangtang area. This understanding is important and significant to making further discussion on the uplift mechanism and continental dynamics of the Tibetan Plateau.

    Original languageEnglish
    Pages (from-to)45-55
    Number of pages11
    JournalScience in China, Series D: Earth Sciences
    Volume44
    Publication statusPublished - 2001

    Keywords

    • Deep crust composition
    • Magma source region feature
    • Neogene volcanism
    • North Qiangtang
    • Petrology and geochemistry

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