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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Zircon geochronology suggests a long-living and active magmatic system beneath the Ciomadul volcanic dome field (eastern-central Europe)
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Zircon geochronology suggests a long-living and active magmatic system beneath the Ciomadul volcanic dome field (eastern-central Europe)

机译：锆石地理学表明，在Ciomadul火山圆顶领域（中欧东部）下方的长生和活跃的岩石系统

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Ciomadul is the youngest volcano in eastern-central Europe. Although its last eruption occurred at ca. 30 ka, there are independent indications for a high-crystallinity magma reservoir persisting beneath the volcano until present. In order to further test the hypothesis of long-lived melt presence and to better constrain the nature and timescales associated with the subvolcanic magma storage system, over 500 zircon U-Th and U-Pb spot ages (crystal interiors and outer surfaces) were interpreted from dacitic rocks of the most productive eruptive period (the Young Ciomadul Eruptive Period; YCEP, 160-30 ka). Zircon surface ages from lava dome and pumice samples range from ca. 600 ka up to the youngest eruption event at 30 ka. They form a continuous age distribution and some single crystals reveal significant age zonation (>150 kyr difference from core to rim). The oldest zircon ages of YCEP overlap with the last eruption events of the Old Ciomadul Eruptive Period (1000-330 ka). The zircon age spectra, combined with textural data, point to a prolonged (several 100's kyr) residence in a highly crystalline mush state. The range in zircon crystallization temperature (from similar to 750 degrees C to the solidus at similar to 680 degrees C) is consistent with the results of thermometry on amphibole and plagioclase from felsic crystal clots, which represent crystal mush fragments. To maintain magma reservoir for such a long time above solidus, continuous magma input by deeper recharge is required. Zircon crystallization model calculations constrained by thermal modelling imply an average rate of magma input of about 1.3 x 10(-4) km(3)/yr over 2 Myr. Such estimate allows us to calculate an extrusive/intrusive ratio of 1:25-1:30. The model calculations suggest that a crystal mush zone of about 35 km(3) is still present within the subvolcanic magma reservoir. Importantly, the Ciomadul plumbing system thus remains thermally primed and renewed magma injection could lead to rapid reawakening and eruption of the apparently inactive volcano. (C) 2021 The Authors. Published by Elsevier B.V.
机译：乔马杜尔火山是欧洲中东部最年轻的火山。尽管其最后一次喷发发生在约30 ka，但有独立迹象表明，高结晶度岩浆储层一直存在于火山下方，直到现在。为了进一步验证长期熔体存在的假设，并更好地限制次火山岩浆储存系统的性质和时间尺度，从最具生产力的喷发期（年轻的Ciomadul喷发期；YCEP，160-30 ka）的英安岩岩石中解释了500多个锆石U-Th和U-Pb斑点年龄（晶体内部和外部表面）。熔岩穹隆和浮石样品的锆石表面年龄从约600 ka到最年轻的喷发事件30 ka不等。它们形成了一个连续的年龄分布，一些单晶显示出明显的年龄分带（从核到边缘的差异大于150 kyr）。YCEP最古老的锆石年龄与古乔马杜尔喷发期（1000-330 ka）的最后一次喷发事件重叠。锆石年龄谱，结合结构数据，表明在一种高度结晶的糊状状态下有一个长时间（几百kyr）的居住地。锆石结晶温度的范围（从750摄氏度到680摄氏度的固相线）与长英质晶体凝块中的角闪石和斜长石的测温结果一致，后者代表晶体糊状碎片。为了使岩浆储层在固相线以上保持如此长的时间，需要通过更深的补给持续输入岩浆。受热模拟约束的锆石结晶模型计算表明，岩浆输入的平均速率约为1.3 x 10（-4）km（3）/yr，超过2 Myr。这样的估计使我们能够计算出1:25-1:30的突出/侵入比率。模型计算表明，次火山岩浆储层中仍存在约35 km（3）的结晶糊状带。重要的是，Ciomadul管道系统因此仍处于热启动状态，重新注入的岩浆可能会导致这座看似不活跃的火山迅速苏醒和喷发。（c）作者2021。由Elsevier B.V.出版。

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