近日，伊朗沙希德·贝赫什提大学Mohsen Zadsaleh团队报道了利用伊朗北部达马万德层状火山飞地追踪化石岩浆储层的岩石成因。相关论文发表在2026年2月2日出版的《地球化学学报》杂志上。

达马万德复式火山位于伊朗北部阿尔布尔士山脉中段。针对该火山在阿尔布尔士山脉形成的地球动力学机制及控制因素，已有诸多研究进行探讨。火山体由多期熔岩流与火山碎屑沉积构成，岩性以粗面岩与粗面安山岩为主。熔岩流中常包含多种岩性的捕虏体，如二长岩、二长闪长岩和二长辉长岩，这些捕虏体为理解达马万德火山的岩浆历史与演化提供了重要线索。

同位素数据（¹⁴³Nd/¹⁴⁴Nd = 0.512559–0.512623；⁸⁷Sr/⁸⁶Sr = 0.704745–0.704929；¹⁷⁶Hf/¹⁷⁷Hf = 0.282722–0.282773）显示火山活动期间岩浆源区存在变化，尽管捕虏体与寄主岩石具有相似的¹⁴³Nd/¹⁴⁴Nd 与⁸⁷Sr/⁸⁶Sr比值，且接近全硅酸盐地球值。微量元素特征表明达马万德火山在地球化学上具有埃达克质属性（主要为低硅埃达克岩）。捕虏体与寄主岩的εNd值对⁸⁷Sr/⁸⁶Sr同位素比值进一步支持了这些岩石主要来源于增厚下地壳的埃达克岩这一解释。

岩相学、元素与同位素数据的综合解译表明，达马万德火山的捕虏体并非源自单次喷发或单一阶段。相反，这些捕虏体是古老岩浆房在深部结晶后，被后续喷发携带至地表的碎片。εNd与⁸⁷Sr/⁸⁶Srr同位素比值进一步揭示，随着火山随时间演化，岩浆迁移呈现出由地壳深部向浅部运移的趋势。这一过程反映了火山系统内岩浆生成与运移动力学的动态变化，为解析达马万德火山的复杂演化提供了关键依据。通过研究这些过程，研究组能够深入理解火山系统的岩浆历史、活动行为及其演化规律。

附：英文原文

Title: Tracing the petrogenesis of fossil magma reservoirs using enclaves in the Damavand stratovolcano, northern Iran

Author: Zadsaleh, Mohsen, Pourkhorsandi, Hamed, Debaille, Vinciane, de Jong, Jeroen, Fontijn, Karen, Masoudi, Fariborz

Issue&Volume: 2026-02-02

Abstract: Damavand stratovolcano is situated within the central Alborz Mountains in northern Iran. Numerous studies have delved into the geodynamics and the factors contributing to the formation of Damavand volcano in the Alborz Mountains. The volcano comprises multiple lava flows and pyroclastic deposits, predominantly consisting of trachyte and trachyandesite. The lava flows often contain enclaves with various lithological compositions like monzonite, monzodiorite and monzogabbro, and these provide valuable insights into the magmatic history and evolution of Damavand volcano. Isotopic data (143Nd/144Nd=0.512559–0.512623; 87Sr/86Sr=0.704745–0.704929; 176Hf/177Hf=0.282722–0.282773) indicate changes in the magma source during volcanic activity, although isotopic compositions of both the enclaves and their host rocks have similar 143Nd/144Nd vs 87Sr/86Sr values, which lie close of the Bulk Silicate Earth values. Trace elements indicate that Damavand volcano is geochemically adakitic (mainly low-silica adakites). The εNd values vs 87Sr/86Sr isotope ratios for both the enclaves and the host rocks further support the interpretation that these rocks are primarily adakites derived from a thickened lower crust.

The interpretation of the petrographic, elemental and isotopic data suggests that the enclaves at Damavand volcano did not originate from a single eruption or phase. Instead, these enclaves are fragments of ancient magma reservoirs that crystallized at depth and were later brought to the surface by subsequent eruptions. The εNd vs 87Sr/86Sr isotope ratios further indicate that, as the volcano evolved over time, magma migration occurred from deeper to shallower depths in the Earth’s crust. This trend reflects the changing dynamics of magma generation and movement within the volcanic system, shedding light on the complex evolution of Damavand volcano. By studying these processes, we can gain valuable insights into the magmatic history and behavior of the volcanic systems and their evolution.

DOI: 10.1007/s11631-026-00853-7

Source: https://link.springer.com/article/10.1007/s11631-026-00853-7