The mafic enclaves from Mesozoic intermediate-acid magmatic rocks, widely developed along Fujian coast, are considered to be the results of large-scale crust-mantle interaction and magma mixing. In this paper, petrography, mineralogy, and geochemistry of granites and mafic microgranular enclaves (MMEs) in Langqi Island are studied to provide new information for tracing crust-mantle interaction. The zircon U-Pb dating results show that the Langqi rocks were formed at ∼101 Ma, which are metaluminous, enriched in silica and high-K calc-alkaline I-type granites. The enclaves have a typical magmatic structure, which is characterized by magma mixing between high-temperature basic magma and low-temperature acidic magma through injecting. The enclaves and host granites show a tendency to mixed major and trace elements, displaying a clear-cut contact relationship, which is indicative of coeval magmatism. The genesis of Langqi rocks is related to the extensional setting caused by the subduction of Paleo-Pacific Plate, and they are the results of mixing of subduction-related metasomatized mantle-derived mafic and induced crustal-melted granitic magma originating from partial melting of the crustal material.

中文翻译：

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福建省琅岐岛早白垩世晚期岩浆混合：岩石学，地球化学和锆石年代学的证据

在福建沿海广泛发育的中生代中酸性岩浆岩中的镁铁质飞地被认为是大规模地壳-地幔相互作用和岩浆混合的结果。本文研究了琅岐岛花岗岩和镁铁质微粒飞地的岩石学，矿物学和地球化学特征，为追踪地幔相互作用提供了新的信息。锆石U-Pb测年结果​​表明，郎岐岩形成于〜101 Ma，富含金属元素，富含二氧化硅和高钾钙碱性I型花岗岩。这些飞地具有典型的岩浆结构，其特征在于通过注入将高温基本岩浆与低温酸性岩浆混合。飞地和主花岗岩显示出将主要元素与微量元素混合的趋势，显示出清晰的接触关系，这表明了当时的岩浆作用。琅岐岩石的成因与古太平洋板块俯冲引起的伸展背景有关，是俯冲相关交代变质的地幔基性岩浆与地壳熔融花岗岩岩浆混合的结果。地壳材料。