Integrated geophysical and geological methods to investigate the inner and outer structures of the Quaternary Mýtina maar (W-Bohemia, Czech Republic)

Integrated geophysical and geological methods to investigate the inner and outer structures of the Quaternary Mýtina maar (W-Bohemia, Czech Republic)
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综合地球物理和地质方法研究第四纪 Mátina maar(捷克共和国西波希米亚)的内部和外部结构

DOI:
10.1007/s00531-014-1136-0
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发表时间:
2015
影响因子:
2.3
通讯作者:
Seidel
Seidel
中科院分区:
地球科学3区
文献类型:
--
作者:
Flechsig;Heinicke;Mrlina;Kämpf;Nickschick;Schmidt;Günther;Rücker;Seidel

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Mingtina maar是波希米亚地块中第一个已知的第四纪maar。根据Mrlina等人的研究结果(J Volcanol Geother Res 182:97 - 112,2009),进行了多参数地球物理(电阻率层析成像、重力测量、磁力测量、地震)和地质/石油化学研究。对这些数据的解释提供了关于火山杂岩内部结构的新信息:(1)火山后沉积充填物深度的说明(可达~100米);(2)一个(或两个)被解释为侵入体或火山渣锥遗迹的隐藏火山结构的磁性和电阻率迹象。对玛珥外部结构的调查结果包括:(1)玛珥外部环形断裂带的证据;(2)地表火山喷出物和火山碎屑沉积物的探测和分布;(3)Mechtina maar和Hecelezná hecrka火山渣锥之间区域的电阻率层析成像和重力数据的迹象,该区域被解释为一个被火山碎屑岩填充的古山谷,并沿塔霍夫断裂带走向线(NW-SE)沿着排列。这些发现是有价值的贡献,以扩大知识的结构玛珥火山一般。由于切布盆地东北部持续活跃的岩浆作用(约1000年),Mechtina maar-diatreme火山及其周围地区是一个合适的关键研究区域,旨在重建波希米亚地块的古火山演化和评估未来可能的潜在危险。
The Mýtina maar is the first known Quaternary maar in the Bohemian Massif. Based on the results of Mrlina et al. (J Volcanol Geother Res 182:97–112, 2009), a multiparametric geophysical (electrical resistivity tomography, gravimetry, magnetometry, seismics) and geological/petrochemical research study had been carried out. The interpretation of the data has provided new information about the inner structure of the volcanic complex: (1) specification of the depth of post-volcanic sedimentary fill (up to ~100 m) and (2) magnetic and resistivity signs of one (or two) hidden volcanic structures interpreted as intrusions or remains of a scoria cone. The findings at the outer structure of the maar incorporate the (1) evidence of circular fracture zones outside the maar, (2) detection and distribution of volcanic ejecta and tephra-fall deposits at the surface, and (3) indications from electrical resistivity tomography and gravity data in the area between the Mýtina maar and Železná hůrka scoria cone, interpreted as a palaeovalley, filled by volcaniclastic rocks, and aligned along the strike line (NW–SE) of the Tachov fault zone. These findings are valuable contributions to extend the knowledge about structure of maar volcanoes in general. Because of ongoing active magmatic processes in the north-east part of the Cheb Basin (ca. 15–30 km north of the investigation area), the Mýtina maar-diatreme volcano and surroundings is a suitable key area for research directed to reconstruction of the palaeovolcanic evolution and assessment of possible future hazard potential in the Bohemian Massif.
DOI: --
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