The tectonomagmatic evolution of the Rhodope area, Bulgaria

在保加利亚南部的Rhodope地区构成了一个非常适合的地形，以调查过程中活跃的晚碰撞后的构造制度。作为涉及沉积学和结构研究的跨学科项目（Bündelantrag）的一部分，拟议项目的目的是研究（1）高压蛇绿岩和（2）碰撞后高钾火山岩。在项目的头几个月，我们收集了大量的样品，包括HP榴辉岩和镁铁质到长英质火山岩。取样的熔岩几乎涵盖了全世界在这种环境中发现的K富集的全部范围，包括钾玄岩和Absarokites。在第一个模型中，这种成分的传播被解释为反映俯冲过程中的变量源富集。对高压榴辉岩的地质温度和Lu-Hf年代学的初步结果表明，两个不同的高峰期变质（白垩纪和第三纪）。在项目的第二阶段，我们打算对火山岩进行额外的微量元素和同位素测量，并最终确定Lu-Hf和Sm-Nd地质年代学。研究结果将有助于对高压地体演化和高钾岩浆活动成因的全面认识。

The Rhodope area in Southern Bulgaria constitutes a highly suited terrain to investigate processes active in a late- to post-collisional tectonic regime. As part of an interdisciplinary project (Bündelantrag) involving sedimentological and structural studies, the aim of the proposed project was to examine (1) HP ophiolites and (2) post-collisional high-K volcanic rocks. In the first months of the project we collected an extensive sample suite including HP eclogites and mafic to felsic volcanic rocks. The sampled lavas virtually cover the complete range of K enrichment found in such settings worldwide, including shoshonites and absarokites. In a first model, this compositional spread is interpreted to mirror variable source enrichment by subduction processes. Initial results on the geothermometry and Lu-Hf geochronology of the HP eclogites suggest two different periods of peak metamorphism (Cretaceous and Tertiary). In the second phase of the project, we intend to carry out additional trace element and isotope measurements on the volcanic rocks as well as to finalize Lu-Hf and Sm-Nd geochronology. The results will significantly contribute to the general understanding of the evolution of HP terrains and the origin of high-K magmatism.