Reconnaissance study of an inferred Quaternary maar structure in the western part of the Bohemian Massif near Neualbenreuth, NE-Bavaria (Germany)

Reconnaissance study of an inferred Quaternary maar structure in the western part of the Bohemian Massif near Neualbenreuth, NE-Bavaria (Germany)
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对位于巴伐利亚东北部纽阿尔本罗伊特附近的波希米亚地块西部推断的第四纪玛珥构造进行的勘察研究

DOI:
10.1007/s00531-017-1543-0
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发表时间:
2017
影响因子:
2.3
通讯作者:
Nowaczyk
Nowaczyk
中科院分区:
地球科学3区
文献类型:
--
作者:
Rohrmüller;Kämpf;Großmann;Mingram;Mrlina;Plessen;B.Stebich;Veress;C. Wendt;Nowaczyk

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经过全面的地球物理勘探后,位于两个第四纪火山渣锥Komorní hrka/Kammerbühl和Eisenbühl之间的第四纪Mtina Maar可能会在2007年在德国和捷克边境的科学钻探中被发现。进一步的地球物理现场调查发现了另一个地质构造,位于小镇Neualbenreuth(德国东北-巴伐利亚)东南偏东约2.5 km处,推测也是一个maar构造,是沿着西北-东南走向的Tachov断层带排列的第四个火山特征。在数字高程模型中,它只是模糊地显示为部分圆形边缘。虽然没有明确的磁异常,但地电和折射地震层析成像强烈地显示了一个充满低电阻率和低速物质的碗状凹陷,与-2.5 mGal的明确负重力异常很好地相关。下面,2015年,在一个100米长的沉积物岩心中发现了15米厚的碎片层,主要是层状沉积物的连续性。在岩芯的上部(22-30 m)和下部(70-86 m)分别发现了富含有机质和树花粉的精细层压层,可能是纹层,被解释为间冰期,而大多数成矿层压沉积物,有机质贫乏,树花粉(几乎)贫瘠,被解释为碎屑冰川沉积物。根据磁性地层学、孢粉学、放射性碳测年和旋回地层学的初步年龄模型,恢复的沉积物跨越约85 ka至约270 ka的时间窗口,涵盖海洋同位素阶段5-8。沉积速率在间冰期为10 cm ka− 1,在冰期为100 cm ka− 1。地层记录类似于Mechtina Maar的记录,其喷发日期来自附近的火山灰存款,为288 ± 17 ka,因此支持推断的Neualbenreuth Maar的年龄模式。
After a comprehensive geophysical prospecting the Quaternary Mýtina Maar, located on a line between the two Quaternary scoria cones Komorní hůrka/Kammerbühl and Železná hůrka/Eisenbühl, could be revealed by a scientific drilling at the German–Czech border in 2007. Further geophysical field investigations led to the discovery of another geological structure about 2.5 km ESE of the small town Neualbenreuth (NE-Bavaria, Germany), inferred to be also a maar structure, being the fourth volcanic feature aligned along the NW–SE trending Tachov fault zone. It is only faintly indicated as a partial circular rim in the digital elevation model. Though not expressed by a clear magnetic anomaly, geoelectric and refraction seismic tomography strongly indicates a bowl-shaped depression filled with low-resistivity and low-velocity material, correlating well with the well-defined negative gravity anomaly of − 2.5 mGal. Below ca. 15 m-thick debris layer, successions of mostly laminated sediments were recovered in a 100 m-long sediment core in 2015. Sections of finely laminated layers, likely varves, rich in organic matter and tree pollen, were recognized in the upper (22–30 m) and lower (70–86 m) part of the core, respectively, interpreted as interglacials, whereas mostly minerogenic laminated deposits, poor in organic matter, and (almost) barren of tree pollen are interpreted as clastic glacial deposits. According to a preliminary age model based on magnetostratigraphy, palynology, radiocarbon dating, and cyclostratigraphy, the recovered sediments span the time window from about 85 ka back to about 270 ka, covering marine isotope stages 5–8. Sedimentation rates are in the range of 10 cm ka−1in interglacials and up to 100 cm ka−1in glacial phases. The stratigraphic record resembles the one from Mýtina Maar, with its eruption date being derived from a nearby tephra deposit at 288 ± 17 ka, thus supporting the age model of the inferred Neualbenreuth Maar.
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发表时间: 2011
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发表时间: 2012
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