From Magma Formation to Eruption: Temperature Path of Two Late Carboniferous Post-Collisional Calderas (Bohemian Massif)

IF 3 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
I. Olšanská, F. Tomek, C. Robustelli Test, E. Zanella, M. Svojtka, J. Trubač, F. Cifelli, F. Finger
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Abstract

The thermal evolution of magmatic systems of the Altenberg-Teplice and Tharandter Wald calderas, which erupted during the terminal post-collisional phase of the Variscan orogeny in the Bohemian Massif, was investigated. The zircon saturation temperatures and Ti-in-zircon thermometer indicate that the intrusive and extrusive units of the two calderas were sourced from medium- to high-temperature (∼770–930°C) felsic lower crustal magma. Using an integrated rock-magnetic and paleomagnetic approach through thermal demagnetization and stepwise thermomagnetic curves, it was estimated that intracaldera ignimbrites reached temperatures of 550–600°C. The low-temperature component (350–450°C) likely corresponds to the alteration of magnetic minerals during cooling or late-stage magmatic/hydrothermal events. Placing these findings in the broader context of Variscan post-collisional magmatism might suggest a trend of decreasing magma temperatures from 330 Ma to 302 Ma within the two lower-to mid-crustal (Moldanubian) and upper-crustal (Saxothuringian) units of the Bohemian Massif, possibly reflecting the cooling of the hot collisional orogen. Lastly, we suggest that a combination of zircon temperature estimates with the rock-magnetic methods may provide a comprehensive framework for further research on the thermal evolution of felsic magmatic systems.

Abstract Image

从岩浆形成到喷发:两个晚石炭世碰撞后火山口(波西米亚地块)的温度路径
研究了波希米亚地块Variscan造山末期喷发的Altenberg-Teplice火山口和Tharandter Wald火山口岩浆系统的热演化过程。锆石饱和温度和锆石ti -in-锆石温度表表明,两个破火山口的侵入和挤压单元来源于中~高温(~ 770 ~ 930℃)长英质下地壳岩浆。通过热退磁和逐步热磁曲线的综合岩石磁性和古磁学方法,估计火山口内的火成岩温度达到550-600°C。低温成分(350-450℃)可能对应于冷却或晚期岩浆/热液事件中磁性矿物的蚀变。将这些发现放在Variscan碰撞后岩浆活动的大背景下,可能表明在波西米亚地块的两个中下地壳(Moldanubian)和上地壳(Saxothuringian)单元内岩浆温度从330 Ma下降到302 Ma,可能反映了热碰撞造山带的冷却。最后,我们认为将锆石温度估算与岩石磁学方法相结合,可以为进一步研究长英质岩浆系统的热演化提供一个全面的框架。
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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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