Mafic adakite-like magmatism at the Cretaceous–Paleogene boundary from the Northwest Rhodopes, Bulgaria

P. Filipov
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引用次数: 0

Abstract

New findings of monzogabbro and gabbro-monzodiorite dykes aged 62 Ma reveal the existence of magmatism in the gap between termination of the Late Cretaceous subduction-related and start of the early–middle Eocene post-collisional magmatic stages in the Rhodope Massif. Their geochemical compositions strongly resemble adakitic signature as well as hornblende and epidote geobarometers predicted lower crustal conditions (20–30 km depth) of crystallization. Detailed studies on U-Pb geochronology of zircon populations and Sr-Nd-Hf isotopic compositions point to significant assimilation of the local basement and mixing of mantle-crust sources in the regime of a thickened crust.
保加利亚罗多彼山脉西北部白垩纪-古近纪交界处的黑云母类金刚岩浆活动
年龄为 62 Ma 的单斜辉长岩和辉长岩-单斜辉长岩岩体的新发现揭示了罗多彼山丘在晚白垩世俯冲相关阶段结束与早中新世碰撞后岩浆阶段开始之间的岩浆活动。它们的地球化学成分与阿达克特特征以及角闪石和榍石测地仪预测的低地壳结晶条件(20-30 千米深度)十分相似。对锆石群的 U-Pb 地球年代学和 Sr-Nd-Hf 同位素组成的详细研究表明,在地壳增厚的情况下,当地基底和地幔-地壳源混合的同化作用显著。
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