Accessory mineral constraints on crustal evolution: elemental fingerprints for magma discrimination
Accessory mineral constraints on crustal evolution: elemental fingerprints for magma discrimination
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DOI：
10.7185/geochemlet.2006
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发表时间：
2020-02
影响因子：
4.9
通讯作者：
E. Bruand;M. Fowler;C. Storey;O. Laurent;C. Antoine;M. Guitreau;E. Heilimo;O. Nebel
中科院分区：
文献类型：
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作者：
E. Bruand;M. Fowler;C. Storey;O. Laurent;C. Antoine;M. Guitreau;E. Heilimo;O. Nebel
未被充分勘探的副矿物，如钛铁矿和磷灰石，有可能使人们深入了解其寄主岩石的性质和岩石成因。它们的微量元素和富稀土成分记录了它们的结晶历史和源区的化学特征。此外，钛铁矿和某种程度上的磷灰石在沉积循环中具有抗侵蚀性，这使它们成为重建长期侵蚀大陆地块历史的理想材料。在这里，我们报告了新的微量元素数据磷灰石和钛的花岗岩类的不同太古代的花岗岩和比较花岗岩类的中生代。这两种矿物的微量元素特征揭示了Y，LREE和Sr含量的系统化学趋势与其寄主岩浆的性质，这是用来构建区分图描绘太古代TTG sanukitoids，和现代埃达克岩S/I型花岗岩。通过比较太古代花岗岩类（TTG和sanukitoids）和他们的中生代同行（埃达克岩和高Ba-Sr花岗岩），我们表明，这些阶段的强大的性质，使他们可靠的记录员的岩石成因信息，太古代岩石，通常受到影响的次生过程（变质，变形，热液活动）。应用于岩石记录，这两个阶段可能提供详细的档案岩浆演化的时间。
Underexplored accessory minerals such as titanite and apatite have the potential to give insights into the nature and the petrogenesis of their host rock. Their trace element and REE- rich compositions carry a record of crystallisation history and chemical characteristics of their source. Moreover, titanite and, to a certain extent, apatite are resistant to erosion during sedimentary cycles which makes them ideal to reconstruct the history of long-eroded continental landmasses. Here we report new trace element data on apatite and titanite from granitoids of different Archean cratons and comparative granitoids from the Phanerozoic. Trace element signatures of both minerals reveal systematic chemical trends in Y, LREE and Sr contents related to the nature of their host magma, which are used to construct discrimination diagrams delineating Archean TTGs from sanukitoids, and modern adakites from S/I-type granites. By comparing Archean granitoids (TTG and sanukitoids) and their Phanerozoic counterparts (adakite and high Ba-Sr granites), we show that the robust nature of these phases makes them reliable recorders of petrogenetic information from Archean rocks, that usually have been affected by secondary processes (metamorphism, deformation, hydrothermal activity). Applied to the rock record, both phases potentially provide detailed archives of magmatic evolution through time.