Li Haina, Han Jun, Li Fengli, Li Heyang, Zhao Zhonghai, Liu Yang, Chen Jiayu, Yin Yechang, Han Yu
College of Mining, Liaoning Technical University, Fuxin, 123000, Liaoning, China.
Liaoning Key Laboratory of Green Development of Mineral Resources, Liaoning Technical University, Fuxin, 123000, Liaoning, China.
Sci Rep. 2024 Dec 30;14(1):31985. doi: 10.1038/s41598-024-83550-w.
Apatite is widely used as an indicator mineral to reflect the characteristics and petrogenesis of host magma. In this study, we present apatite geochemical and in-situ Sr-Nd isotopic data of monzogranite, granodiorite and dioritic enclave in the eastern Songnen-Zhangguangcai Range Massif, aiming to fingerprinting their petrogenesis and magmatic evolution processes. Based on apatite textures and geochemistry characteristics, the apatites were categorized into two distinct groups. Group 1 apatites have subhedral-anhedral textures and high Sr content (> 500 ppm). The majority of their ε(t) values are relatively consistent with those of host monzogranites, indicating that they crystallized from crustal-derived material. Conversely, Group 2 magmatic apatites have euhedral-subhedral and core-rim textures, as well as low Sr content (< 500 ppm). This group can further be divided into two subgroups of Group 2A and 2B based on zoned textures and compositions. Group 2A zoned apatites exhibit high Sr/Nd and Sr/Y ratios at the rim and have discontinuous Ba contents, suggesting that they were derived from magma mixing and the granodiorite may be the felsic end-member. The Group 2B apatites are characterized by high Ce and Eu contents with low Y contents and Sm/Nd ratios, indicating that they originated from metaluminous I-type granitoids. The apatites also record the magmatic evolution processes, including fractional crystallization of plagioclase and titanite, as well as fluid exsolution. Combining apatite and whole rock geochemistry, it is shown that the parental magma was related to subduction of Mudanjiang Oceanic crust.
磷灰石被广泛用作指示矿物，以反映寄主岩浆的特征和成岩作用。在本研究中，我们展示了松嫩-张广才岭地块东部二长花岗岩、花岗闪长岩和闪长质包体的磷灰石地球化学及原位Sr-Nd同位素数据，旨在确定它们的成岩作用和岩浆演化过程。根据磷灰石的结构和地球化学特征，磷灰石被分为两个不同的组。第1组磷灰石具有半自形-他形结构，Sr含量较高（>500 ppm）。它们的大多数ε(t)值与寄主二长花岗岩的ε(t)值相对一致，表明它们由地壳源物质结晶形成。相反，第2组岩浆磷灰石具有自形-半自形和核-边结构，以及低Sr含量（<500 ppm）。根据分带结构和成分，该组可进一步分为2A和2B两个亚组。第2A组分带磷灰石在边缘显示出高Sr/Nd和Sr/Y比值，且Ba含量不连续，表明它们源自岩浆混合，花岗闪长岩可能是长英质端元。第2B组磷灰石的特征是Ce和Eu含量高，Y含量和Sm/Nd比值低，表明它们源自准铝质I型花岗岩类。磷灰石还记录了岩浆演化过程，包括斜长石和钛铁矿的分离结晶以及流体出溶。结合磷灰石和全岩地球化学，表明母岩浆与牡丹江洋壳的俯冲有关。
