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首页> 外文期刊>Contributions to Mineralogy and Petrology >Zircon geochronology and geochemistry to constrain the youngest eruption events and magma evolution of the Mid-Miocene ignimbrite flare-up in the Pannonian Basin, eastern central Europe
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Zircon geochronology and geochemistry to constrain the youngest eruption events and magma evolution of the Mid-Miocene ignimbrite flare-up in the Pannonian Basin, eastern central Europe

机译：锆石的年代学和地球化学，以限制中欧东部Pannonian盆地中新世中生火成岩爆发的最年轻的喷发事件和岩浆演化

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A silicic ignimbrite flare-up episode occurred in the Pannonian Basin during the Miocene, coeval with the syn-extensional period in the region. It produced important correlation horizons in the regional stratigraphy; however, they lacked precise and accurate geochronology. Here, we used U-Pb (LA-ICP-MS and ID-TIMS) and (UTh)/He dating of zircons to determine the eruption ages of the youngest stage of this volcanic activity and constrain the longevity of the magma storage in crustal reservoirs. Reliability of the U-Pb data is supported by (U-Th)/He zircon dating and magnetostratigraphic constraints. We distinguish four eruptive phases from 15.9 +/- 0.3 to 14.1 +/- 0.3 Ma, each of which possibly includes multiple eruptive events. Among these, at least two large volume eruptions (>10 km(3)) occurred at 14.8 +/- 0.3 Ma (Demjen ignimbrite) and 14.1 +/- 0.3 Ma (Harsany ignimbrite). The in situ U-Pb zircon dating shows wide age ranges (up to 700 kyr) in most of the crystal-poor pyroclastic units, containing few to no xenocrysts, which implies efficient recycling of antecrysts. We propose that long-lived silicic magma reservoirs, mostly kept as high-crystallinity mushes, have existed in the Pannonian Basin during the 16-14 Ma period. Small but significant differences in zircon, bulk rock and glass shard composition among units suggest the presence of spatially separated reservoirs, sometimes existing contemporaneously. Our results also better constrain the time frame of the main tectonic events that occurred in the Northern Pannonian Basin: We refined the upper temporal boundary (15 Ma) of the youngest counterclockwise block rotation and the beginning of a new deformation phase, which structurally characterized the onset of the youngest volcanic and sedimentary phase.
机译：中新世期间，潘诺尼盆地发生硅质火成岩爆发事件，与该区域的同伸展期同时发生。它在区域地层学中产生了重要的相关视野。但是，他们缺乏精确的年代学。在这里，我们使用锆石的U-Pb（LA-ICP-MS和ID-TIMS）和（UTh）/ He测年来确定该火山活动最年轻阶段的喷发年龄，并限制了地壳中岩浆储存的寿命水库。 U-Pb数据的可靠性受到（U-Th）/ He锆石测年和地磁地层学约束的支持。我们从15.9 +/- 0.3 Ma到14.1 +/- 0.3 Ma区分了四个喷发阶段，每个阶段可能包括多个喷发事件。其中，至少两次大爆发（> 10 km（3））分别发生在14.8 +/- 0.3 Ma（Demjen易燃物）和14.1 +/- 0.3 Ma（Harsany易燃物）。原位U-Pb锆石测年表明，在大多数晶体贫乏的火成碎屑单元中，年龄范围很广（最高700 kyr），几乎没有或几乎没有异种晶，这意味着前体的有效回收。我们认为，潘诺尼盆地在16-14 Ma时期存在着长寿命的硅质岩浆储集层，大部分保持为高结晶度糊状。单位之间锆石，块状岩石和玻璃碎片成分的微小但显着差异表明存在空间分隔的储层，有时会同时存在。我们的结果还更好地限制了北部Pannonian盆地发生的主要构造事件的时间框架：我们优化了逆时针最小旋转的上部时间边界（15 Ma）和新的变形阶段的开始，这在结构上表征了最年轻的火山和沉积期开始。

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