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Triassic (Anisian and Rhaetian) palaeomagnetic poles from the Germanic Basin (Winterswijk, the Netherlands)
Journal of Palaeogeography ( IF 2.5 ) Pub Date : 2019-11-08 , DOI: 10.1186/s42501-019-0046-2
Lars P. P. van Hinsbergen , Douwe J. J. van Hinsbergen , Cor G. Langereis , Mark J. Dekkers , Bas Zanderink , Martijn H. L. Deenen

In this paper, we provide two new Triassic palaeomagnetic poles from Winterswijk, the Netherlands, in the stable interior of the Eurasian plate. They were respectively collected from the Anisian (~ 247–242 Ma) red marly limestones of the sedimentary transition of the Buntsandstein Formation to the dark grey limestones of the basal Muschelkalk Formation, and from the Rhaetian (~ 208–201 Ma) shallow marine claystones that unconformably overlie the Muschelkalk Formation. The magnetization is carried by hematite or magnetite in the Anisian limestones, and iron sulfides and magnetite in the Rhaetian sedimentary rocks, revealing for both a large normal polarity overprint with a recent (geocentric axial dipole field) direction at the present latitude of the locality. Alternating field and thermal demagnetization occasionally reveal a stable magnetization decaying towards the origin, interpreted as the Characteristic Remanent Magnetization. Where we find a pervasive (normal polarity) overprint, we can often still determine well-defined great-circle solutions. Our interpreted palaeomagnetic poles include the great-circle solutions. The Anisian magnetic pole has declination D ± ∆Dx = 210.8 ± 3.0°, inclination I ± ∆Ix = − 26.7 ± 4.9°, with a latitude, longitude of 45.0°, 142.0° respectively, K = 43.9, A95 = 2.9°, N = 56. The Rhaetian magnetic pole has declination D ± ∆Dx = 32.0 ± 8.7°, inclination I ± ∆Ix = 50.9 ± 8.1°, with a latitude, longitude of 60.6°, 123.9° respectively, K = 19.3, A95 = 7.4°, N = 21. The poles plot close to the predicted location of global apparent polar wander paths (GAPWaPs) in Eurasian coordinates and are feasible for future apparent polar wander path construction. They confirm that the intracontinental, shallow-marine Germanic Basin, in which the Muschelkalk Formation was deposited, existed at a palaeolatitude of 14.1° [11.3, 17.1] N, in a palaeo-environment reminding of the Persian Gulf today. In Rhaetian times, palaeolatitudes of 31.6° [24.8, 39.8] N were reached, on its way to the modern latitude of 52°N.

中文翻译:

来自日耳曼盆地(荷兰温特斯韦克)的三叠纪(阿尼西亚和雷蒂亚)古地磁极

在本文中,我们在欧亚板块的稳定内部提供了来自荷兰 Winterswijk 的两个新的三叠纪古地磁极。它们分别是从 Buntsandstein 组向基底 Muschelkalk 组的深灰色石灰岩的沉积过渡的 Anisian (~ 247-242 Ma) 红色泥质灰岩和 Rhaetian (~ 208-201 Ma) 浅海相粘土岩中收集的它不整合地覆盖在 Muschelkalk 组上。磁化由 Anisian 石灰岩中的赤铁矿或磁铁矿以及 Rhaetian 沉积岩中的硫化铁和磁铁矿携带,揭示了在该地区的当前纬度具有最近(地心轴偶极子场)方向的大法向极性叠印。交变场和热退磁偶尔会显示向原点衰减的稳定磁化,解释为特征剩磁。在我们发现普遍(正常极性)叠印的地方,我们通常仍然可以确定明确定义的大圆解决方案。我们解释的古地磁极包括大圆解。Anisian磁极的磁偏角D±ΔDx=210.8±3.0°,倾角I±ΔIx=-26.7±4.9°,经纬度分别为45.0°、142.0°,K=43.9,A95=2.9°, N = 56. 雷氏磁极磁偏角 D ± ∆Dx = 32.0 ± 8.7°,倾角 I ± ∆Ix = 50.9 ± 8.1°,纬度、经度分别为 60.6°、123.9°,K = 19.3,A95 = 7.4°,N = 21。极点图靠近欧亚坐标中全球视极漂移路径 (GAPWaPs) 的预测位置,对于未来的视极漂移路径构建是可行的。他们证实,沉积 Muschelkalk 组的陆内浅海日耳曼盆地位于北纬 14.1° [11.3, 17.1] 的古纬度,古环境让人想起今天的波斯湾。在雷蒂亚时代,古纬度达到了 31.6° [24.8, 39.8] N,并在通往现代纬度 52°N 的途中。
更新日期:2019-11-08
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