土耳其卡拉德尼兹技术大学Arslan, Mehmet研究了土耳其东北部新生代基性火山活动成因，撰写了后碰撞下大陆岩石圈地幔的交代作用和不均一性综述。相关论文于2023年12月13日发表在《地球化学学报》杂志上。

研究人员表示，迄今为止，基性火山岩的传统全岩亲石地球化学资料对次大陆岩石圈地幔的来源具有重要的制约作用。基性火山岩的亲石元素和高亲铁元素地球化学的综合数据也揭示了次大陆岩石圈地幔存在的非均质性，这主要与之前的俯冲作用和碰撞后的壳幔相互作用在伸展环境下引起的可变交代作用有关。亲石元素地球化学特征表明，母岩浆源自交代的含尖晶石—石榴子石的次大陆岩石圈地幔源，用于始新世和中新世具有俯冲特征的基性火山岩，而源自含尖晶石至石榴子石的次大陆岩石圈地幔源，用于中新世—上新世和上新世—第四纪没有俯冲特征的玄武质火山岩。

亲石元素和高亲铁元素地球化学特征也表明，始新世和中新世基性火山岩比中新世—上新世和第四纪玄武质火山岩受道更明显的地壳岩浆的污染。此外，这些基性火山岩的亲石元素和高亲铁元素成分以及区域不对称岩石圈拆沉模型，揭示了新生代母岩浆形成的次大陆岩石圈地幔岩石的非均质性，在时间上发生了显著的成分变化(特别是由于交代作用)。

据介绍，土耳其东北部新生代碰撞后基性火山岩显示出全岩亲石元素和高亲铁元素(HSE)系统的时间变化，这主要与次大陆岩石圈地幔(SCLM)的性质和母熔体的生成有关。

附：英文原文

Title: A geochemical perspective on the genesis of Cenozoic basic volcanism in northeastern Turkey: an overview of metasomatism and heterogeneity of the sub-continental lithospheric mantle in a post-collisional setting

Author: Arslan, Mehmet, Temizel, rfan

Issue&Volume: 2023-12-13

Abstract: The post-collisional Cenozoic basic volcanic rocks in NE Turkey show temporal variations in whole-rock lithophile element and highly siderophile element (HSE) systematics that are mainly associated with the nature of sub-continental lithospheric mantle (SCLM) sources and parental melt generation. So far, the traditional whole-rock lithophile geochemical data of these basic volcanic rocks have provided important constraints on the nature of SCLM sources. Integrated lithophile element and HSE geochemical data of these basic volcanic rocks also reveal the heterogeneity of the SCLM source, which is principally related to variable metasomatism resulting from previous subduction(s) and post-collisional mantle-crust interactions in an extensional setting. Lithophile element geochemical features suggest that the parental magmas have derived from metasomatized spinel- to garnet-bearing SCLM sources for Eocene and Miocene basic volcanic rocks with subduction signatures whereas originated from spinel- to garnet-bearing SCLM sources for Mio-Pliocene and Plio-Quaternary basaltic volcanic rocks without the subduction signature. Lithophile element and HSE geochemistry also reveal that Eocene and Miocene basic volcanic rocks were affected by more pronounced crustal contamination than the basaltic volcanic rocks of Mio-Pliocene and Quaternary. Furthermore, the integrated lithophile element and HSE compositions of these basic volcanic rocks, together with the regional asymmetric lithospheric delamination model, reveal that the compositional variation (especially due to metasomatism) was significant temporally in the heterogeneity of the SCLM sources from which parental magmas formed during the Cenozoic era.

DOI: 10.1007/s11631-023-00659-x

Source: https://link.springer.com/article/10.1007/s11631-023-00659-x