Abstract

The typical rocks composing the base of the sedimentary cover of the guyots on the Magellan Seamounts are described. The upper part of the volcanic basement of the guyots is overlain by Aptian deposits of shallow reef ecosystems represented by terrigenous (beach) and organic-chemical (coral, shell-and-detritus, and oolitic) carbonate rocks. These deposits encircle the western part of the Fedorov and Ilyichev guyots, and the satellite buildings of the Alba and Pallada guyots in the form of an almost complete ring, extending from the edge of the plateau summit to 2500–3000 m depth. Down the slope they are replaced by planktonic (nanoforaminiferal) sediments and edaphogenic breccias. The appearance of pelagic limestone is associated with a sea-level rise during the Late Albian–Cenomanian eustatic transgression. Exposures of reef and planktonic limestones of up to 300 km² in area are also recorded on some guyots.

中文翻译：

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太平洋麦哲伦山脉古伊特人上的Aptian–Cenomanian沉积岩的主要类型

摘要

描述了构成麦哲伦海山上古铁的沉积覆盖层基础的典型岩石。盖奥特火山火山基底的上部被浅礁生态系统的Ap​​tian沉积所覆盖，这些浅礁生态系统以陆源（海滩）和有机化学（珊瑚，壳屑和碎屑以及碳酸盐）碳酸盐岩为代表。这些矿床围绕着Fedorov和Ilyichev盖奥特的西部，以及几乎完整的环形形式的Alba和Pallada盖奥特的卫星建筑，从高原山顶的边缘一直延伸到2500-3000 m深度。下坡时，它们被浮游（纳米植物）沉积物和成水角砾岩所取代。上层石灰岩的出现与晚期阿尔比亚－西诺曼尼亚海侵期间海平面上升有关。一些贵族人也记录了该地区的^2人。