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Magmatic Evolution of Garnet-Bearing highly Fractionated Granitic Rocks from Macao,Southeast China:Implications for Granite-Related Mineralization Processes

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Journal of Earth Science 2021年第6期32卷 1454-1471页

作者： Pedro Quelhas João Mata Ágata Alveirinho Dias Institute of Science and Environment University of Saint JosephRua de Londres106MacaoChina Instituto Dom Luiz Faculdade de CiênciasUniversidade de Lisboa1749-016LisboaPortugal

The widespread W-(Mo)-Sn-Nb-Ta polymetallic mineralization in Southeast(SE)China is genetically associated with Mesozoic highly fractionated granitic *** rocks have enigmatic mineralogical and geochemical features,making its petrogenesis an intensely debated *** better understand the underlying magma evolution processes,petrography,garnet chemistry and whole-rock major and trace element data are reported for Jurassic highly fractionated granitic rocks and associated microgranite and aplitepegmatite dikes from Macao and compared with coeval similar granitic rocks from nearby areas in SE *** the fact that the most evolved rocks in Macao are garnet-bearing aplite-pegmatite dikes,the existence of coeval two-mica and garnet-bearing biotite and muscovite granites displaying more evolved compositions(e.g.,lower Zr/Hf ratios)indicates that the differentiation sequence reached higher degrees of fractionation at a regional *** crystal fractionation played an important role,late-stage fluid/melt interactions,involving F-rich fluids,imparted specific geochemical characteristics to Macao and SE China highly fractionated granitic rocks such as the non-CHARAC(CHArge-and-RAdius-Controlled)behavior of trace elements,leading,for example,to non-chondritic Zr/Hf ratios,Rare Earth Elements(REE)tetrad effects and Nb-Ta enrichment and *** process contributed to the late-stage crystallization of accessory phases only found in these highly evolved *** the latter,two populations of garnet were identified in MGI(Macao GroupⅠ)highly fractionated granitic rocks:small grossular-poor euhedral grains and large grossular-rich skeletal garnet grains with quartz *** first group was mainly formed through precipitation from highly evolved Mn-rich slightly peraluminous melts under low-pressure and relatively low temperature(~700℃)*** of upper crust metasedimentary materials may have contributed as a source of Mn and

关键词： highly fractionated granites aplite Macao(South China) Jurassic late-stage fluid/melt interactions garnet non-CHARAC REE tetrad effect

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