WebFracture pattern, pseudotachylite veins and breccia dikes were studied in the basement rocks of the Rochechouart structure to clarify their genetic relationship to the impact event. The structural investigations led to the conclusion that the impact-induced fractures... WebOct 11, 2006 · [1] High temperature impact melt breccias from the Rochechouart (France) meteorite crater record a magnetization component with antipodal, normal and reverse polarities. The corresponding paleomagnetic pole for this component lies between the 220 Ma and 210 Ma reference poles on the Eurasian apparent polar wander path, consistent …

A new high-precision Ar/ 5 Ma older than the Triassic Jurassic …

WebDuring the pressure shock, the crystalline structure of quartz will be deformed along planes inside the crystal. These planes, which show up as lines under a microscope, are called planar deformation features (PDFs), or shock lamellae. Commonly found in impact craters. Web三疊紀-侏羅紀滅絕事件（Triassic–Jurassic extinction event）是顯生宙五大生物集群滅絕事件之一，發生於三疊紀與侏羅紀之間，大約是1億9960萬年前（另一說法是2億140萬年前）。 這次滅絕事件的影響程度遍及陸地與海洋。在海洋生物中，有20%的科消失，包含著名的牙形石 ；許多大型伪鳄类、大部分獸 ... choline intake

File:Montoume Breccia (214 Ma, Late Triassic; Rochechouart …

WebAug 21, 2024 · All impactite formations of the Rochechouart impact structure have a clear electrical signature Large-scale electrical investigations unveil a rough transition between … Rochechouart impact structure or Rochechouart astrobleme is an impact structure in France. Erosion has over the millions of years has mostly destroyed its impact crater, the initial surface expression of the asteroid impact leaving highly deformed bedrock and fragments of the crater's floor as evidence of it. In … See more Named after the town of Rochechouart, the Rochechouart impact structure is located on the western margin of the French Massif Central near the city of Limoges, approximately 350 km (220 mi) south of Paris. Rochechouart … See more The impact origin of the structure was recognized by F. Kraut in 1969. The occurrence of an unusual set of rock types referred to as … See more Geophysicist David Rowley, working with John Spray and Simon Kelley, suggested that Rochechouart may have been part of a hypothetical … See more The Rochechouart impact structure is composed of central sub circular zone approximately 12 km (7.5 mi) in diameter exposing breccias and impact melt rocks (represented in grey … See more The age of the Rochechouart impact is a matter of debate. The ages (within the error bars) spans from less than 150 million years ago to … See more The Rochechouart impact structure is located on the margin of the French Massif Central. The target rocks exposed both in the center of … See more The geometrical center of the structure is located 4 km (2.5 mi) west of Rochechouart, near the little village of la Judie (see map). … See more http://www.impact-structures.com/impact-france/the-rochechouart-impact-rocks/ choline in supplements for children