摩洛哥阿特拉斯西部的阿尔卑斯沉积作用

IF 1.9 3区 地球科学 Q1 GEOLOGY
Etienne Jaillard , Emmanuel Robert , Jean-Louis Latil , Moussa Masrour
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引用次数: 0

摘要

通过对野外切片的详细研究和对大量氨虫的收集,可以明确西阿特拉斯(摩洛哥)阿尔比系的沉积演化和年龄。在经历了最早阿尔卑斯时代的重大停滞之后,阿尔卑斯时代的横断面开始于杜维里克拉斯-莱顿斯带晚期,部分为碎屑沉积。随后出现了粘土质泥灰岩沉积(Douvilleiceras mammillatum 区),并向上演化为部分碳酸盐、层状沉积的早阿尔卑斯晚期至中阿尔卑斯早期(Lyelliceras pseudolyelli 至早 Lyelliceras lyelli 区)。包括大部分中白垩世在内的一个大断裂之后,又出现了一个新的断裂,首先是砂质沉积(Dipoloceras cristatum 和 Pervinquiria pricei 区),然后是粘土质泥灰岩和石灰岩结核(Pervinquieria inflata 区)。海平面的急剧下降(晚期 Pervinquieria inflata 至早期 Pervinquieria fallax 区)导致了浅海碳酸盐大陆架(Kechoula Formation)的形成。最后一次跨界脉冲使外陆架粘质泥灰岩得以沉积(Pervinquieria rostrata 至 Arrhaphoceras briacensis(?)在最近的早阿尔比世和晚阿尔比世记录了缺氧至缺氧条件,分别与莱恩哈特层和布雷斯特罗费层相关。与北非和南欧的阿尔卑斯继替的相关性表明,尽管阿尔卑斯晚期海平面下降可能因构造作用而加剧,但最重要的沉积断裂主要起源于震荡作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Albian sedimentation in western Atlas, Morocco

Detailed study of field sections and extensive ammonite collection allowed to specify the sedimentary evolution and age of the Albian series of the Western Atlas (Morocco). After a significant hiatus of earliest Albian age, the Albian transgression began in the late Douvilleiceras leightonense Zone with partly clastic deposits. A transgressive pulse gave way to clayey marl deposits (Douvilleiceras mammillatum Zone), which evolved upward to partly carbonate, laminated deposits of late early Albian to earliest middle Albian age (Lyelliceras pseudolyelli to early Lyelliceras lyelli zones). A major hiatus that encompassed most of the middle Albian, was followed by a new transgression marked first by sandy deposits (Dipoloceras cristatum and Pervinquiria pricei zones), and then by clayey marl and limestone nodules (Pervinquieria inflata Zone). A sharp sea level fall (late Pervinquieria inflata to early Pervinquieria fallax zones) led to the development of a shallow marine carbonate shelf (Kechoula Formation). A last transgressive pulse allowed deposition of outer shelf clayey marls (Pervinquieria rostrata to Arrhaphoceras briacensis (?) zones), interrupted near the Albian-Cenomanian boundary by a sea level fall and hiatus. Anoxic to disoxic conditions are recorded in the latest early Albian and the late Albian, which correlate with the Leenhardt and Breistroffer levels, respectively. Correlations with Albian successions in North Africa and southern Europe suggest a mainly eustatic origin for the most important sedimentary discontinuities, although the late Albian sea-level drop may be tectonically enhanced.

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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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