伊拉克苏莱曼尼大学Tola A. Mirza团队研究了伊拉克库尔德斯坦地区Penjween地区Sirginil千枚岩群的矿物学和地球化学特征：对物源和源区风化的影响。这一研究成果发表在2025年4月24日出版的《地球化学学报》上。

研究组对Penjween地区出露的Sirginil千枚岩群进行了调查，以确定源区的物源和风化程度。千枚岩的岩相学研究表明，它们的成分几乎均匀，并且具有高度的细颗粒。最突出的特征是扭结带结构和网状组构，主要由绿泥石、白云母、石英和斜长石的细粒矿物组合组成。地球化学数据表明，千枚岩代表了页岩和杂砂岩的前体，作为其原岩，经历了强烈的化学风化而没有分选。

此外，石墨的存在作为有机物的指示，表明原岩沉积岩的快速运输和埋藏，起源于一个独特的源区。化学蚀变指数和化学风化指数的平均值表明，源材料在潮湿环境中发生了高度风化。Th/U比值以及Th和U的浓度表明了原岩沉积过程中的沉积起源和氧化条件。

REE模式与显著的负Eu异常和低Th/Sc比值相结合，以及La/Sc与Th/Sc、La/Yb与La/Ce和Th/Yb相对于Ta/Yb的图，表明大陆边缘是沉积原岩的古环境。所研究样品的Th/Sc比值表示起源于主要的长英质火成岩源，而Zr/Sc比值的中值表示所有研究样品中只有轻微的分选和锆石添加。

附：英文原文

Title: Mineralogical and geochemical features of Sirginil phyllite group from Penjween area, Iraqi Kurdistan region: Implications for provenance and source-area weathering

Author: Mirza, Tola A., Kalaitzidis, Stavros P., Abdalla, Shahra O., Tsiotou, Sofia

Issue&Volume: 2025-04-24

Abstract: The Sirginil Phyllite Group being outcropping in Penjween area is investigated to determine the provenance and weathering level of the source area. Petrographic investigation of the phyllites shows that they are almost homogeneous in composition and highly crenulated. The most prominent features are kink band structures and network fabrics, consisting mainly of fine-grained mineral assemblages of chlorite, muscovite, quartz, and plagioclase feldspar. The geochemical data indicate that the phyllite rocks represent precursors of shales and greywackes as their protolith, having undergone an intensive degree of chemical weathering without sorting. Additionally, the presence of graphite, as an indication of organic matter, points to quick transport and burial of the protolith sedimentary rocks, which originated from a unique source area. The average values of the chemical alteration index and chemical weathering index indicate that a high degree of weathering of the source materials occurred in a humid environment. The Th/U ratio, as well as the concentrations of Th and U, indicates a sedimentary origin and oxidizing conditions during sedimentation of the protolith rocks. The REE pattern coupled with prominent negative Eu anomaly and low Th/Sc ratios, as well as the plots of La/Sc versus Th/Sc, La/Yb versus La/Ce, and Th/Yb versus Ta/Yb, indicates a continental margin as the paleoenvironment of the sedimentary protolith. The Th/Sc ratios for the studied samples denote origin from a predominantly felsic igneous source, while the median Zr/Sc ratio indicates only a minor degree of sorting and zircon addition in all the studied samples.

DOI: 10.1007/s11631-025-00778-7

Source: https://link.springer.com/article/10.1007/s11631-025-00778-7