北部高原(摩洛哥)Aïn Beni Mathar Guefaït盆地的首次磁地层学结果:上新世-更新世Dhar Iroumyane复合剖面

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2023-02-01 DOI:10.1016/j.geobios.2023.01.004
Josep M. Parés , Hamid Haddoumi , Mathieu Duval , Hassan Aouraghe , Claudia Álvarez-Posada , Sila Pla-Pueyo , Alfonso Benito-Calvo , Antonio Rodríguez-Hidalgo , Jan Van der Made , Pedro Piñero , Jordi Agustí , Aïcha Oujaa , Rainer Grün , María Gema Chacón , Robert Sala-Ramos
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引用次数: 2

摘要

Aïn Beni Mathar-Guefaït盆地位于高原地区(摩洛哥),被穆卢亚河东部主要支流扎河切割,扎河在上新世-更新世沉积物中切割了150多米。本研究的主要目的是基于磁地层学和电子自旋共振(ESR)的结合,为这种盆地充填提供一个初步的地质年代学框架。这些综合结果对古生物记录的年代、穆卢雅河的演化以及划分盆地的断层的活动都有影响。我们研究的沉积岩基本上是平坦的,是冲积和湖相/湖相的。在平均每个地点2.5米的地方取样了大约140米厚的剖面,从而建立了一个包括9次地磁反转的局部磁极性地层学。虽然没有折叠测试,但双极性和岩磁分析的存在使我们相信磁化方向是主要的。然后,我们利用生物地层资料和当地地质观测资料,将获得的磁带锚定在地磁极性时间标度(GPTS)上。我们提出的基于磁地层学的年代学揭示了一个上新世-更新世的沉积充填,跨越了Gauss至Olduvai时代。下部的碎屑地层大多属于正常的高斯年代期,而上部的湖相和滩相碳酸盐,几乎分布在沉积充填体的顶部,在年龄上属于奥杜瓦伊。这些结果为高原最大的山间盆地之一的盆地填充物提供了第一个年代限制。新的磁地层学还揭示了导致北马格里布从冲积到湖滩条件转换的主要环境变化发生在约2.6 Ma的gaus - matuyama反转附近。此外,该遗址Guefaït-4的年龄比石英颗粒的ESR年龄大约早1 myr。讨论了这种低估的可能来源。然而,我们也承认并讨论了对当前数据的其他可能的年代地层解释,尽管可能性较小。
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First magnetostratigraphic results in the Aïn Beni Mathar-Guefaït Basin, Northern High Plateaus (Morocco): The Pliocene-Pleistocene Dhar Iroumyane composite section

The Aïn Beni Mathar-Guefaït Basin, in the High Plateau Region (Morocco), is dissected by the Za River, the main eastern tributary of the Moulouya, which incises more than 150 m into Plio-Pleistocene sediments. The main goal of the present study is to provide an initial geochronologic framework for such basin infill based on a combination of magnetostratigraphy and electron spin resonance (ESR). The combined results have implications on the age of the paleontological record, the evolution of the Moulouya River, and the activity of the faults that delimit the basin. We have studied sedimentary rocks that are essentially flat-lying and of an alluvial and lacustrine/palustrine origin. An approximately 140 m-thick section has been sampled at an average of 2.5 m per site, allowing to build a local magnetic polarity stratigraphy that includes nine geomagnetic reversals. Although no fold test is available, the presence of dual polarities and rockmagnetic analysis give us confidence that magnetization directions are primary. We then anchored the obtained magnetozones to the Geomagnetic Polarity Timescale (GPTS) using the biostratigraphic data as well as local geological observations. Our proposed magnetostratigraphy-based chronology reveals a Plio-Pleistocene sedimentary infill spanning from Gauss to Olduvai Chrons. The lower, detrital formations mostly fall within the normal Gauss Chron, whereas the upper lacustrine and palustrine carbonates, which are almost widespread to the top of the sedimentary fill, are Olduvai in age. These results provide the first chronological constraints for the basin fill in one of the largest intermontane basins of the High Plateaus. The new magnetostratigraphy also reveals that the major environmental change that triggered a switch from alluvial to lacustrine-palustrine conditions in Northern Maghreb occurred near the Gauss-Matuyama reversal, ca. 2.6 Ma. In addition, it shows that the age of the paleontological site Guefaït-4 is approximately 1 myr older than the ESR ages obtained from the quartz grains. The possible sources for this underestimation are discussed. However, we also acknowledge and discuss other possible chronostratigraphic interpretations of the current data, although less likely.

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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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