Abstract The Biga Peninsula (NW Turkey) is an area where magmatic and tectonic events are observed together, and post-collisional plutons are extensively seen. Two plutons in this peninsula were studied; the Goloba Pluton is composed of quartz monzonite, granite and granodiorite, and the Şaroluk Pluton is composed of quartz monzonite, monzonite and granodiorite. U–Pb zircon dating yielded 20.87 ± 0.31 Ma for the Goloba pluton, 19.69 ± 0.25 Ma for a quartzmonzonite porphyry vein cutting this pluton, and 22.18 ± 0.40 to 21.51 ± 0.37 Ma for the Şaroluk pluton, revealing an Early Miocene emplacement age for these pluton magmatism. These plutons are geochemically similar to each other with high-K calc-alkaline compositions. Their A/CNK values range between 0.84 and 1.48, suggesting I-type and metaluminous to slightly peraluminous characteristics. The rock samples show linear-like correlations in major oxide and trace element variation diagrams, which indicate main mineral phase’ fractionation. The Goloba and Şaroluk plutons also exhibit enrichment in large ion lithophile elements (K, Sr, Rb and Ba), Ce and Th, with decreases in high field strength elements (Ti and Y), Ta and Nb. Chondrite normalised REE diagrams of the plutonic rocks show concave upward patterns (LaN/LuN = 11–34), and slight negative Eu anomalies (EuN/Eu* = 0.51–1.03). In the Goloba pluton samples, 87Sr/86Sr(i), 143Nd/144Nd(i) and ƐNd(i) values vary from 0.706792 to 0.707250, from 0.512435 to 0.512489, and from −2.36 to −3.41, respectively. In the Şaroluk pluton samples, 87Sr/86Sr(i) and 143Nd/144Nd(i) isotopic values range within 0.706978–0.707669 and 0.512456–0.512520 respectively, and ƐNd(i) values are between −1.75 and −2.99. Fractional crystallisation, rather than assimilation and mixing, seems to have been important in the evolution of the studied plutons. All geochemical data suggest that the parental magma(s) of the studied plutons were hybrid magma that originated from enriched lithospheric mantle and lower/middle crust end-members. According to the regional geology and petrological data, Neogene magmatism in the Biga Peninsula has post-collisional feature, and was closely related to slab break-off.

中文翻译：

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土耳其西北部比加半岛早中新世 Göloba 和 Şaroluk 岩体的 U-Pb 锆石年代学和岩石学：对碰撞后岩浆作用和地球动力学演化的影响

摘要 比加半岛（土耳其西北部）是一个同时观察到岩浆和构造事件的地区，并且广泛地看到了碰撞后的岩体。研究了这个半岛的两个岩体；Goloba Pluton 由石英二长岩、花岗岩和花岗闪长岩组成，而 Şaroluk Pluton 由石英二长岩、二长岩和花岗闪长岩组成。Goloba 岩体的 U-Pb 锆石测年结果为 20.87 ± 0.31 Ma，切割该岩体的石英二长斑岩脉为 19.69 ± 0.25 Ma，22.18 ± 0.40 至 21.51 ± 0.37 Ma 揭示了 Şplacement 早期的 Plutone,岩浆作用。这些岩体在地球化学上彼此相似，具有高 K 钙碱性成分。它们的 A/CNK 值介于 0.84 和 1.48 之间，表明 I 型和金属铝到微铝的特性。岩石样品在主要氧化物和微量元素变化图中显示出线性相关性，表明主要矿物相的分异。Goloba 和 Şaroluk 岩体还富含大离子亲石元素（K、Sr、Rb 和 Ba）、Ce 和 Th，而高场强元素（Ti 和 Y）、Ta 和 Nb 则减少。深成岩的球粒陨石归一化 REE 图显示凹向上模式（LaN/LuN = 11-34），和轻微的负 Eu 异常（EuN/Eu* = 0.51-1.03）。在 Goloba 岩体样本中，87Sr/86Sr(i)、143Nd/144Nd(i) 和ƐNd(i) 值分别从 0.706792 到 0.707250、从 0.512435 到 0.512489 和从 -312486 到 -31.36 变化 在 Şaroluk 岩体样品中，87Sr/86Sr(i) 和 143Nd/144Nd(i) 同位素值分别在 0.706978–0.707669 和 0.512456–0.512520 之间，ƐNd(i) 值介于 -1.) 之间 75 和 -2.99。分数结晶，而不是同化和混合，似乎在研究的岩体演化中很重要。所有地球化学数据表明，所研究岩体的母岩浆是源自富集岩石圈地幔和下/中地壳端部的混合岩浆。根据区域地质和岩石学资料，比加半岛新近纪岩浆活动具有后碰撞特征，与板块断裂关系密切。