南极洲南设得兰群岛利文斯顿岛巴纳德角岩浆岩从侵入到喷出的案例研究

Stoyan Georgiev, Eleonora Balkanska, Stefan Velev, Stefan Metodiev, Neven Georgiev, M. Guillong, Sergiy Kurylo
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摘要

分析了从海平面到 Mac Kay Peak 463 米处花岗闪长岩巴纳德角岩体主岩阶段的三个样本。U-Pb锆石地质年代显示岩浆结晶时间为43.89±032Ma。钙闪石测温显示了地壳浅层的形成(5-3.5 千米,温度为 810-750 °C)。利用磷灰石裂变轨迹分析,可区分与唐格拉山隆起和浴成岩掘出相对应的两个主要阶段。这些模型显示,在 40 至 33 Ma 之间,最初的冷却速度非常快,达到 ~ 80-90 °C;在 22 至 15 Ma 之间,发生了第二次隆起和适度冷却,达到地表温度。得到的年龄-高度正相关表明,中度隆升速率为340 m/Ma。对湿度最低的样本进行的热模拟显示,从 8 Ma 到最近,地表温度出现了一次中等程度的冷却,这与布兰斯菲尔德大裂谷的起始时间相吻合。
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From pluton intrusion to its exhumation: a case study from Barnard Point Batholith, Livingston Island, South Shetland Archipelago, Antarctica
Three samples from the main phase of the Barnard Point Batholith of granodiorite from the sea level up to 463 m of Mac Kay Peak – are analyzed. The U-Pb zircon geochronology reveals magmatic crystallization at 43.89±032 Ma. The Ca-amphibole thermobarometry shows a shallow crustal level emplacement (5–3.5 km and temperatures of 810–750 °C). Two main episodes that correspond to the uplift of the Tangra Mountain and exhumation of the batholith are distinguished using apatite fission-track analysis. The models reveal initial very rapid cooling to ~ 80–90 °C between 40 and 33 Ma and a second episode of uplift and moderate cooling to surface temperatures between 22 and 15 Ma. The obtained positive age-altitude correlation suggests moderate exhumation rate of 340 m/Ma. The thermal modelling of the hypsometrically lowest sample reveals a later moderate cooling event to surface temperatures from 8 Ma to recent times, which corresponds to the Bransfield Rift initiation.
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