Magnetosusceptability Stratigraphy (MSS): Key to "Floating" Orbitally Forced Timescales, Cyclostratigraphy, and Cyclochronology

9628202克里克正在开发一种基于生物地层控制和快速、易于执行的磁测量相结合的高分辨率旋回对比和旋回年代学的新方法。我们称这种方法为磁感应地层学(MSS)。MSS的高分辨率来自于轨道强迫旋回控制下的高频事件，目前的Milankovitch频段(19-23，41，54,100,413ka)。用于证明这一建议的初步数据来自一些泥盆纪海相层序：摩洛哥，因为它拥有突出的露头、出色的生物地层控制和艾菲尔/吉维辛GSSP；欧洲，法国南部蒙塔涅黑海的两个国际公认的泥盆纪层序(包括弗拉斯尼亚/法门期GSSP)；以及俄克拉荷马州南部的弗拉斯尼亚-图尔奈斯。拟议的工作将使人们能够证明：(1)MSS是有效的，(2)它能够以高于最佳生物带分辨率的方式在盆地内、盆地之间和区域之间提供相互关系，(3)MSS曲线固有的趋势是海侵/退缩或加深/变浅序列的证据，(4)利用近距离采样的MSS替代轨道强迫循环，以及(5)一旦根据所关注的地质时间进行校准，从较长和合理完整的地层剖面中确定的轨道强迫循环的持续时间可用于建立或构建“浮动”轨道强迫时间尺度。虽然认识到可以通过沉积物中留下的记录追踪轨道周期是一项重要贡献，但更重要的是在创建“浮动”轨道强迫时间尺度方面重要的周期持续时间。这些时间尺度是基于对几个轨道强迫旋回的认识，而不是参考一条锚定在全新世的曲线，将有助于加深我们对演化和沉积力量的理解，并将生物地层带的持续时间固定在L辐射测量时间的精确框架内。这种循环年代学最终必须产生一个连贯的地质年代学，其分辨率至少比目前使用的分辨率提高一个数量级。

9628202 Crick Are developing a new method for high-resolution cyclocorrelation and cyclochronology based on a combination of biostratigraphic control and quick, easily performed magnetic measurements. We are calling the method magnetosusceptibility stratigraphy (MSS). The high resolution of Mss is derived from high-frequency events under the control of orbital forcing cycles with current frequencies of the Milankovitch band (19-23, 41, 54, 100, 413 ka). The preliminary data used to document the proposal are from a number of Devonian marine sequences: Morocco, an area chosen because it contains outstanding outcrop exposures, excellent biostratigraphic control, and the Eifelian/Givetian GSSP; Europe, two internationally recognized Devonian sequences in the Montagne Noire, southern France (including the Frasnian/Famennian GSSP); and the Frasnian-Tournaisian of southern Oklahoma. The proposed work will allow use to demonstrate that (1) MSS works, (2) it can provide correlations at better than the best biozone resolution within basins, among basins, and between regions, (3) trends inherent to the MSS curves are evidence of transgressive/regressive or deepening/shallowing sequences, (4) with close sampling MSS proxies for orbital forcing cycles, and (5) once calibrated for the geologic time of interest, the duration of orbital forcing cycles identified from long and reasonably complete stratigraphic sections can be used to establish or construct "floating" orbital forcing timescales. While the recognition that orbital cycles can be traced by the record left in sediments is an important contribution, even more important is the duration of cycles important in the creation of "floating" orbital forcing timescales. These timescales, based on the recognition of the several orbital forcing cycles but not referenced to a curve anchored in the Holocene, will serve to further our understanding of the forces of evolution and sedimentation and to fix the duration of biostratigraphic zones within the l ess precise framework of radiometric time. Such cyclochronologies must eventually lead to a coherent geochronology with increased resolution of at least one order of magnitude over that presently in use.