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On the geodynamics of the Alpine collisional granitoids from Central Anatolia: petrology, age and isotopic characteristics of the granitoids of the Ekecikdağ Igneous Association (Aksaray/Turkey)
Geodinamica Acta Pub Date : 2019-01-01 , DOI: 10.1080/09853111.2019.1597677
Fatma Toksoy-Köksal 1
Affiliation  

ABSTRACT Granitoids of the Ekecikdağ Igneous Association (Central Anatolia/Turkey) are products of collisional–post-collisional magmatism in the Ekecikdağ area. These granitoids are granodiorite, microgranite and leucogranite. Field relations of granodiorites with microgranites is obscured, but leucogranites intrude both rock types. Mean zircon laser ablation (LA)-ICP-MS 206Pb-238U ages of granodiorites and microgranites are 84.52 ± 0.93 Ma and 80.7 ± 1.6 Ma, respectively, and age of leucogranites is suggested as 80 Ma, based on field relations combined with 206Pb/238U and Rb-Sr ages. Crystallisation temperatures of granodiorites, microgranites and leucogranites are 728°C-848°C, 797°C-880°C, 704°C-809°C, respectively. Geochemical characteristics including Sr-Nd isotopic evidences infer a non-cogenetic character, as there is a high crustal contribution in I-type granodiorite sources, a crustal source with insignificant and significant mantle inputs in S-type microgranites and leucogranites, respectively. LA-ICP-MS Lu-Hf isotope data from zircons reveal their crustal nature (εHf(t): −1.3 ± 0.5 to −8.8 ± 0.5). Crustal melting linked to the Alpine thickening during the Late Cretaceous led to formation of heterogeneous sourced granitoids with crustal dominated sources in the Ekecikdağ area. Understanding of the nature and evolution of collisional Ekecikdağ granitoids is not only important to put contribution in the geodynamic evolution of Central Anatolia and surrounding Alpine area, but also to better understand systematics of collisional magmatic systems.

中文翻译:

安纳托利亚中部高山碰撞花岗岩的地球动力学:Ekecikdağ火成岩协会(阿克萨赖/土耳其)花岗岩的岩石学、年龄和同位素特征

摘要 Ekecikdağ火成岩协会(安纳托利亚中部/土耳其)的花岗岩是Ekecikdağ地区碰撞后岩浆作用的产物。这些花岗岩是花岗闪长岩、微花岗岩和无色花岗岩。花岗闪长岩与微花岗岩的现场关系模糊不清,但白花岗岩侵入两种岩石类型。锆石激光烧蚀 (LA)-ICP-MS 206Pb-238U 平均花岗闪长岩和微花岗岩年龄分别为 84.52±0.93 Ma 和 80.7±1.6 Ma,根据野外关系结合/206P,建议白花岗岩年龄为 80 Ma 238U 和 Rb-Sr 年龄。花岗闪长岩、微花岗岩和淡色花岗岩的结晶温度分别为728℃-848℃、797℃-880℃、704℃-809℃。包括 Sr-Nd 同位素证据在内的地球化学特征推断出非共生特征,由于在 I 型花岗闪长岩源中有较高的地壳贡献,而在 S 型微花岗岩和淡色花岗岩中分别具有不显着和显着地幔输入的地壳源。来自锆石的 LA-ICP-MS Lu-Hf 同位素数据揭示了它们的地壳性质(εHf(t):-1.3 ± 0.5 至 -8.8 ± 0.5)。与晚白垩世高山增厚有关的地壳熔化导致在 Ekecikdağ 地区形成了以地壳为主的非均质花岗岩来源。了解碰撞 Ekecikdağ 花岗岩的性质和演化不仅对安纳托利亚中部和周围高山地区的地球动力学演化做出重要贡献,而且对于更好地理解碰撞岩浆系统的系统学也很重要。分别在 S 型微花岗岩和淡色花岗岩中具有微不足道和显着地幔输入的地壳源。来自锆石的 LA-ICP-MS Lu-Hf 同位素数据揭示了它们的地壳性质(εHf(t):-1.3 ± 0.5 至 -8.8 ± 0.5)。与晚白垩世高山增厚有关的地壳熔化导致在 Ekecikdağ 地区形成了以地壳为主的非均质花岗岩来源。了解碰撞 Ekecikdağ 花岗岩的性质和演化不仅对安纳托利亚中部和周围高山地区的地球动力学演化做出重要贡献,而且对于更好地理解碰撞岩浆系统的系统学也很重要。分别在 S 型微花岗岩和淡色花岗岩中具有微不足道和显着地幔输入的地壳源。来自锆石的 LA-ICP-MS Lu-Hf 同位素数据揭示了它们的地壳性质(εHf(t):-1.3 ± 0.5 至 -8.8 ± 0.5)。与晚白垩世高山增厚有关的地壳熔化导致在 Ekecikdağ 地区形成了以地壳为主的非均质花岗岩来源。了解碰撞 Ekecikdağ 花岗岩的性质和演化不仅对安纳托利亚中部和周围高山地区的地球动力学演化做出重要贡献,而且对于更好地理解碰撞岩浆系统的系统学也很重要。与晚白垩世高山增厚有关的地壳熔化导致在 Ekecikdağ 地区形成了以地壳为主的非均质花岗岩来源。了解碰撞 Ekecikdağ 花岗岩的性质和演化不仅对安纳托利亚中部和周围高山地区的地球动力学演化做出重要贡献,而且对于更好地理解碰撞岩浆系统的系统学也很重要。与晚白垩世高山增厚有关的地壳熔化导致在 Ekecikdağ 地区形成了以地壳为主的非均质花岗岩来源。了解碰撞 Ekecikdağ 花岗岩的性质和演化不仅对安纳托利亚中部和周围高山地区的地球动力学演化做出重要贡献,而且对于更好地理解碰撞岩浆系统的系统学也很重要。
更新日期:2019-01-01
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