布鲁塞尔山,门县,威斯康辛州:一个神秘的不安的基岩区域

IF 1.5 4区 地球科学 Q2 GEOLOGY Journal of Geology Pub Date : 2020-06-11 DOI:10.1086/709276
M. Bjornerud, Juliana E. Olsen-Valdez, Emily E. Zawacki, Drae Rogers, Kirstin Edwards, Colin Nevins
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引用次数: 0

摘要

位于威斯康辛州门县南部的布鲁塞尔山,是一个局部的断层和角化基岩区域,位于一个未变形的下志留纪白云岩区域,该区域已被初步解释为一个陨石坑。受扰动岩石的区域与一个近圆形的、宽2公里的平顶小山重合,该小山高出周围景观约40米。角化基岩上的冰川侵蚀和抛光、条纹表面表明,这种扰动早于最后一次冰进,表明这座山在冰川作用之前可能更高。角化白云岩中含海绿石砂岩的异常侵入体可能来自该地区地下400 m的寒武系地层。在扰动中心钻取103米的岩心,恢复了70米角砾白云岩和页岩,其中大部分为水泡状,但没有显示出震荡变质的特征。岩心下部33 m处为上奥陶统Maquoketa组,呈亚水平状,仅局部破碎。这是令人费解的,因为来自更深层次的材料必须通过这一层。如此破碎的岩石构成了地形高地,这一事实也很难解释。布鲁塞尔山可能是超音速撞击的地点,但不能排除一种内生过程,如在一个双极的上部剧烈破碎。
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Brussels Hill, Door County, Wisconsin: An Enigmatic Area of Disturbed Bedrock
Brussels Hill in southern Door County, Wisconsin, is a localized area of faulted and brecciated bedrock in a region of otherwise undeformed lower Silurian dolostone that has been tentatively interpreted as an impact crater. The area of disturbed rock coincides with a nearly circular, 2-km-wide, flat-topped hill that stands about 40 m above the surrounding landscape. Glacial till and polished, striated surfaces on the brecciated bedrock indicate that the disturbance predated the last ice advance and suggest that the hill may have been even higher before glaciation. Anomalous, apparently intrusive bodies of glauconite-bearing sandstone within the brecciated dolostone were likely derived from Cambrian strata, which are normally 400 m in the subsurface in the area. A 103-m drill core into the center of the disturbance recovered 70 m of brecciated dolostone and shale, much of it vesicular, but with no features diagnostic of shock metamorphism. The lowest 33 m of the core sampled the upper Ordovician Maquoketa Formation, which appeared to be subhorizontal and only locally disrupted. This is puzzling, given that material from greater depth must have been brought up through this level. The fact that an area of such fragmented rock stands as a topographic high is also hard to explain. Brussels Hill may have been the site of supersonic impact, but an endogenous process such as violent fragmentation in the upper part of a diatreme cannot be ruled out.
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来源期刊
Journal of Geology
Journal of Geology 地学-地质学
CiteScore
3.50
自引率
5.60%
发文量
0
审稿时长
3 months
期刊介绍: One of the oldest journals in geology, The Journal of Geology has since 1893 promoted the systematic philosophical and fundamental study of geology. The Journal publishes original research across a broad range of subfields in geology, including geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. Many of its articles have wide appeal for geologists, present research of topical relevance, and offer new geological insights through the application of innovative approaches and methods.
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