Pegmatite dikes in the Malayer–Boroujerd–Shazand magmatic complex, located in the Sanandaj-Sirjan zone of the Zagros orogen, are hosted in both granitoid rocks and their contact and regional metamorphic aureoles. In this study, we report the geochronology, geochemistry and mineral chemistry of these pegmatite dikes. The granitoid rocks in the Malayer–Boroujerd–Shazand magmatic suites are mainly monzogranite, quartz diorite, granodiorite and quartz monzonite characterized by metaluminous to peraluminous I-type compositions of the calc-alkaline series and display the geochemical characteristics of volcanic arc granites related to an active continental margin. The pegmatite dikes mainly consist of quartz, feldspar (albite and orthoclase), tourmaline, muscovite and less common biotite and garnet. The tourmaline content in the igneous-hosted pegmatite dikes is higher than those of metamorphic rocks, whereas the muscovite content is lower in the igneous-hosted pegmatite dikes. The K/Rb ratio and the Rb content of pegmatite dikes and their minerals (K-feldspar and muscovite) indicate that they are less evolved. Pegmatite dikes display a typical calc-alkaline affinity of I-type granites and are classified as peraluminous Lithium-Caesium-Tantalum (LCT) family (barren sub-type) to muscovite class. The tourmaline is a schorl-foitite type, which is common in the early crystallization stage of less evolved pegmatites. U–Pb zircon dating of the Boroujerd and Shazand pegmatite dikes yield weighted mean ²⁰⁶Pb/²³⁸U ages of 160.2 ± 1.8 and 121.8 ± 1.5 Ma, respectively. In contrast, U–Pb zircon dating of the Malayer pegmatite dike gives a mean ²⁰⁶Pb/²³⁸U age of 43.2 ± 1.5 Ma. Our new geochronological data indicate that the first group of pegmatite dikes (older pegmatite dikes) in the Boroujerd district (160.2 ± 1.8 Ma) shows an overlap with the main and first magmatic episode in the Sanandaj–Sirjan zone during Jurassic times, simultaneous with the Middle Cimmerian Orogenic phase, and formed during the subduction initiation. The second group of pegmatite dikes in the Shazand district (121.8 ± 1.5 Ma) formed in the Early Cretaceous and shows a temporal overlap with previously reported ages (ca. 130–114 Ma) during the early Alpine tectonic movements (Late Cimmerian Orogenic phase). Finally, the younger group of pegmatite dikes in the Malayer district (43.2 ± 1.5 Ma) formed in the Eocene overlapping with previously reported ages (ca. 34–52 Ma) which is equivalent to the Laramian phase. These data reveal that the magmatism in the Malayer–Boroujerd–Shazand magmatic complex started in the Early-Middle Jurassic resembling adjacent areas in the Sanandaj–Sirjan zone (e.g., Hamedan region) by melting of crustal protoliths in a subduction tectonic setting. The second and third groups of pegmatite dikes formed during the late subduction to syn-collisional process, respectively. These pegmatite generation marked the subduction initiation to syn-collisional span in the region. The zircon geochemistry (negative Ce anomalies and positive Eu anomalies) is indicative of the relatively oxidized conditions of the parent magma and shows characteristics of continental crust zircon.

位于Zagros造山带的Sanandaj-Sirjan带中的Malayer-Boroujerd-Shazand岩浆复合体中的伟晶岩堤坝均存在于花岗岩岩石中，以及它们的接触和区域变质金矿。在这项研究中，我们报告了这些伟晶岩堤防的地质年代，地球化学和矿物化学。Malayer-Boroujerd-Shazand岩浆组中的花岗岩类岩石主要是钙锰矿，石英闪长岩，花岗闪长岩和石英绿柱石，其特征是钙-碱性系列的金属型至高铝型I型成分，并显示出与弧形花岗岩相关的火山弧花岗岩的地球化学特征。活跃的大陆边缘。伟晶岩堤防主要由石英，长石（斜长石和正长石），电气石，白云母和较少见的黑云母和石榴石组成。火成岩伟晶岩堤防中的电气石含量高于变质岩，而白云母含量在火成岩伟晶岩中较低。伟晶岩堤防及其矿物（钾长石和白云母）的K / Rb比和Rb含量表明它们的演化较少。伟晶岩堤防表现出I型花岗岩的典型的钙碱性亲和力，并被归为白云母锂钙钽钽（LCT）族（贫亚型）至白云母类。电气石是schorl-foiteite类型，在较少演化的伟晶岩的早期结晶阶段很常见。Boroujerd和Shazand伟晶岩堤防的U–Pb锆石测年产生加权平均值 伟晶岩堤防及其矿物（钾长石和白云母）的K / Rb比和Rb含量表明它们的演化较少。伟晶岩堤防表现出I型花岗岩的典型的钙碱性亲和力，并被归为白云母锂钙钽钽（LCT）族（贫亚型）至白云母类。电气石是schorl-foiteite类型，在较少演化的伟晶岩的早期结晶阶段很常见。Boroujerd和Shazand伟晶岩堤防的U–Pb锆石测年产生加权平均值 伟晶岩堤防及其矿物（钾长石和白云母）的K / Rb比和Rb含量表明它们的演化较少。伟晶岩堤防表现出I型花岗岩的典型的钙碱性亲和力，并被归为白云母锂钙钽钽（LCT）族（贫亚型）至白云母类。电气石是schorl-foiteite类型，在较少演化的伟晶岩的早期结晶阶段很常见。Boroujerd和Shazand伟晶岩堤防的U–Pb锆石测年产生加权平均值 电气石是schorl-foiteite类型，在较少演化的伟晶岩的早期结晶阶段很常见。Boroujerd和Shazand伟晶岩堤防的U–Pb锆石测年产生加权平均值 电气石是schorl-foiteite类型，在较少演化的伟晶岩的早期结晶阶段很常见。Boroujerd和Shazand伟晶岩堤防的U–Pb锆石测年产生加权平均值²⁰⁶ Pb / ²³⁸ U年龄分别为160.2±1.8和121.8±1.5 Ma。相比之下，Malayer伟晶岩堤坝的U–Pb锆石测年平均值为²⁰⁶ Pb / ²³⁸U年龄43.2±1.5 Ma。我们的新的年代学数据表明，在侏罗纪时期，Boroujerd地区（160.2±1.8 Ma）的第一组伟晶岩堤（旧的伟晶岩）与Sanandaj–Sirjan地区的主要岩浆和第一岩浆事件重叠。中西里米期造山相，并在俯冲作用起始阶段形成。沙赞德地区的第二伟晶岩堤防（121.8±1.5 Ma）形成于白垩纪早期，并在早期的高山构造运动（晚西里尔造山相）中与先前报道的年龄（约130–114 Ma）存在时间重叠。 。最后，在始新世形成的Malayer地区年轻的伟晶岩堤防（43.2±1.5 Ma）与先前报道的年龄（约34-52 Ma）重叠，这与Laramian相相等。这些数据表明，Malayer-Boroujerd-Shazand岩浆复合体的岩浆作用始于侏罗纪早期-中侏罗纪，类似于Sanandaj-Sirjan地带（例如，Hamedan地区）的邻近地区，是在俯冲构造环境中融化了地壳原生质而形成的。第二组伟晶岩和第三组伟晶岩分别在俯冲作用到同碰撞过程的后期形成。这些伟晶岩的产生标志着该区域的俯冲作用开始于同碰撞跨度。锆石的地球化学（负的Ce异常和正的Eu异常）指示了母岩浆的相对氧化条件，并显示了陆壳锆石的特征。，哈密丹地区）在俯冲构造环境中通过熔化地壳原始岩层而形成。第二组和第三组伟晶岩堤坝分别在俯冲作用晚期至同碰撞过程中形成。这些伟晶岩的产生标志着该区域的俯冲作用开始于同碰撞跨度。锆石的地球化学（负的Ce异常和正的Eu异常）指示了母岩浆的相对氧化条件，并显示了陆壳锆石的特征。，哈密丹地区）在俯冲构造环境中通过熔化地壳原始岩层而形成。第二组伟晶岩和第三组伟晶岩分别在俯冲作用到同碰撞过程的后期形成。这些伟晶岩的产生标志着该区域的俯冲作用开始于同碰撞跨度。锆石的地球化学（负的Ce异常和正的Eu异常）指示了母岩浆的相对氧化条件，并显示了陆壳锆石的特征。