Abstract

Gabbroic enclave in intermediate ignimbrites: The youngest eruptive event in the northern Luzon Arc-Taiwan region

Highlights

  • Mafic enclaves are usually present in igneous rocks that are associated with calc-alkaline igneous suites (Didier 1973)

  • We suggest that the gabbroic enclave and andesitic breccias in the ignimbrites were formed from different magmas passed through the same magma reservoir

  • The field occurrences, petrography, geochronology and geochemistry studies of the gabbroic enclave and andesitic breccias and bombs from the Shihtiping ignimbrite lead us to the following conclusions: (1) The zircon U-Pb dating results show that at approximately 4 Ma, the gabbroic enclave had the same age as the andesitic breccias in the ignimbrite, suggesting that a mafic shallow intrusion coexisted with the intermediate magma eruption

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Summary

Introduction

Mafic enclaves are usually present in igneous rocks that are associated with calc-alkaline igneous suites (Didier 1973) They are formed from source rock partial melting or cumulates at earlier stages of crystallization in the magma reservoir (Maury et al 1978; Bacon 1986; Chappell et al 1987; Dorais et al 1990), and might provide information on the origin and evolution of magma. These mafic enclaves are well documented in volcanic occurrences such as diverse compositions of lava flows or domes. A recharged magma arose and triggered the intermediate magma to assimilate with the gabbroic wall rock and eventually erupted to form ignimbrite

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