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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Integrated stratigraphy and astrochronology of the Messinian GSSP at Oued Akrech (Atlantic Morocco)
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Integrated stratigraphy and astrochronology of the Messinian GSSP at Oued Akrech (Atlantic Morocco)

机译：Oued Akrech（摩洛哥大西洋）的墨西尼GSSP的综合地层和天文学

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摘要

A much improved high-resolution integrated stratigraphy (calcareous plankton biostratigraphy, magnetostratigraphy, cyclostratigraphy) is presented for the classic section of Oued Akrech (Atlantic Morocco) straddling the Tortonian-Messinian boundary. Magnetobiostratigraphic correlations with time-equivalent and astronomically dated sections in the Mediterranean indicate the cyclic alternations of indurated light beige coloured marls and softer, more clayey and reddish coloured marls are dominantly precession-controlled. Characteristic sedimentary cycle patterns, in particular those reflecting precession-obliquity interference, allow for one possible tuning, thus providing accurate astronomical ages for cycles, calcareous plankton events and magnetic reversals. The tuning further indicates that the reddish layers are the equivalent of sapropels in the Mediterranean. The Messinian Global boundary Stratotype Section and Point (GSSP) has recently been formally defined at the base of the reddish layer of cycle No. 15 in section Oued Akrech. This level coincides closely with the first regular occurrence of the Globorotalia miotumida group and is astronomically dated at 7.251 Ma. The global correlation potential is guaranteed by the straightforward calibration of the Oued Akrech magnetostratigraphy to the geomagnetic polarity time scale, locating the GSSP within C3Br.lr. In the marine realm the calcareous nannofossil genus Amaurolithus provides a series of extremely useful events to delimit the boundary on a global scale. The astronomical tuning guarantees a direct first-order calibration of the Messinian GSSP to the standard geological time scale once, as anticipated, the late Miocene part of the astronomical time scale has been incorporated.
机译：Oued Akrech（大西洋摩洛哥）横跨Tortonian-Messinian边界的经典地段，提出了一种改进的高分辨率综合地层（钙质浮游生物地层学，磁地层学，旋回地层学）。磁性地层学与地中海时间上等价的和天文年代的部分的相关性表明，硬质浅米色的泥灰岩和更软的，黏土状的和淡红色的泥灰岩的循环交替主要由岁差控制。特征性的沉积旋回模式，特别是那些反映进动-倾角干扰的沉积旋回模式，允许进行一种可能的调整，从而为旋回，钙质浮游生物事件和磁性反转提供准确的天文年龄。调整进一步表明，带红色的层相当于地中海中的腐殖土。最近，在Oued Akrech区域中第15号循环的红色层基础上正式定义了Messinian整体边界地层剖面和点（GSSP）。这个水平与首次出现的Goloborotalia miotumida组相吻合，并且在天文学上的日期为7.251 Ma。通过将Oued Akrech磁地层学直接校准到地磁极性时标，将GSSP定位在C3Br.lr中，可以保证全局相关电位。在海洋领域，钙质纳米化石属Amaurolithus提供了一系列极为有用的事件，可以在全球范围内划定边界。天文调谐保证，一旦纳入了天文时标的中新世晚期部分，就可以将墨西尼GSSP直接直接校准到标准地质时标。

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