COLLABORATIVE RESEARCH: Carnian-Norian Magnetostratigraphy and Biostratigraphy at Silica Brezova (Slovakia)

9417594 Kent 最近从土耳其的两个海洋剖面和纽瓦克裂谷盆地的厚大陆（湖泊）剖面得出的高质量卡尼期-诺里安磁性地层图不容易关联。 即使两个土耳其剖面之间的相关性也是有问题的，并且通过假设这两个浓缩剖面在三叠纪晚期位于相反的半球而变得容易。 Silica Brezova（斯洛伐克）的 200m 厚的卡尼期-诺里安（上三叠统）剖面为解决卡尼期-诺里安磁性地层对比的不确定性提供了机会。 Silica Brezova 剖面包含所有晚卡尼期和诺里安牙形刺带，位于“哈尔施塔特石灰岩”相异常厚（未凝结）的剖面中。 牙形刺蚀变指数接近 1，表明包含该剖面的推力单元没有明显的掩埋。 对 Silica Brezova 剖面中部（Lacian）部分 35m 间隔进行的初步磁地层学研究得出了清晰的极性分带和阳性褶皱测试。 200m Silica Brezova 剖面的磁性地层学和生物地层学应提供从 Neward 盆地到海洋领域的高分辨率旋回地层学的第一个对比，这对于建立连接海洋和非海洋地层的晚三叠世综合时间尺度至关重要。

9417594 Kent High quality Carnian-Norian magnetostratigraphies derived recently from two marine sections in Turkey and a thick continental (lacustrine) section in the Newark Rift Basin are not easily correlated. The correlation even between the two Turkish sections is problematic, and is facilitated by supposing that the two condensed sections were in opposite hemispheres in Late Triassic time. A 200m thick Carnian-Norian (Upper Triassic) section at Silica Brezova (Slovakia) provides the opportunity to resolve the uncertainties in Carnian-Norian magnetostratigraphic correlations. The Silica Brezova section contains all Late Carnian and Norian conodont zones in an exceptionally thick (uncondensed) section of "Hallstatt Limestone" facies. The conodont alteration indices are close to 1, indicating no appreciable burial of the thrust unit which contains the section. A pilot magnetostratigraphic study on a 35m interval from the middle (Lacian) part of the Silica Brezova section has yielded a clear polarity zonation and a positive fold test. Magnetostratigraphy and biostratigraphy of the 200m Silica Brezova section should provide a first correlation of the high resolution cyclostratigraphy from the Neward Basin to the marine realm which is essential to the development of an integrated Late Triassic timescale linking marine and non-marine stratigraphies.