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在东海地区浅钻ZK2304的片麻岩中,保存了高压—超高压变质矿物组合和一系列复杂的退变结构及相应的变质反应。除石榴石、硬玉质辉石和金红石外,其它峰期高压—超高压阶段(M_2)变质矿物包括多硅白云母、文石和柯石英(假像),典型的峰期矿物组合为:石榴石(Gt)硬玉质辉石(Jd-Cpx)+金红石(Rt)+柯石英(Coe);石榴石(Gr)+硬玉质辉石(Jd-Cpx)+多硅白云母(Phe)+金红石((Rt)(柯石英(Coe);石榴石(Gt)+硬玉质辉石(Jd-Cpx)+文石(Arg)+金红石(Rt)(柯石英(Coe)。石榴石中的钙铝榴石(Gro)分子含量偏高,最高可达50.1 mol％,多硅白云母SiO_2含量明显偏高,为54.37％～54.84％之间,相应的化学单位(Pfu)硅原子数Si=3.54～3.57之间,柯石英假像主要以包体形式存在于石榴石晶体中。
In the gneiss of ZK2304 drilled in the East China Sea, the high-pressure-high-pressure metamorphic mineral assemblage and a series of complex degenerated structures and corresponding metamorphic reactions are preserved. Except for garnet, jadeite and rutile, the other peak metamorphic minerals of high pressure-high pressure stage (M_2) include picene, aragonite and coesite (artifact), and the typical peak mineral assemblages are garnet ( Gt) Jd-Cpx + Rt + Coe; Gr + Jd-Cpx + Phe + Rutile ( Rt (Coe); Garnet (Gt) + Jadeite (Jd-Cpx) + Aragonite + Rutile (Coe) (Gro), the highest content is 50.1 mol%, the content of Silica Muscovite SiO 2 is obviously higher, ranging from 54.37% to 54.84%, and the corresponding chemical unit (Pfu) Si = 3.54 ~ 3.57 Between, Ke Shiying artifacts mainly in the form of inclusions in garnet crystals.