WHEN LIFE GOT HARD: AN ENVIRONMENTAL DRIVER FOR METAZOAN BIOMINERALIZATION

IF 0.8 4区地球科学 Q3 GEOLOGY

Estudios Geologicos-Madrid Pub Date : 2019-09-25 DOI:10.1130/abs/2019am-336386

A. J. Kaufman, Les Kriesfeld, P. Vickers-Rich, G. Narbonne

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引用次数: 1

Abstract

espanolLa repentina aparicion de metazoos biomineralizados en las facies calcareas del Miembro de Pockenbank (Namibia) parece reflejar un rapido cambio en el estado redox, la concentracion de calcio y la alcalinidad del oceano. La combinacion de una importante innovacion biologica con el final de una profunda excursion de isotopos de carbono respalda la idea de que la anomalia Shuram fue un fenomeno tectonico y oceanografico, en contraposicion a una “conspiracion” diagenetica mundial. La concordancia temporal de estos profundos acontecimientos, tal como se conservan en los estratos de Namibia meridional puede considerarse, por tanto, como marcadores geologicos excepcionales para la base del Ediacarico terminal. EnglishThe sudden appearance of biomineralized metazoans in limestone facies of the Pockenbank Member (Namibia) appears to reflect a rapid change of redox state, calcium concentration and alkalinity of the ocean. The coupling of a major biological innovation with the end of a profound carbon isotope excursion supports the view that the Shuram was a tectonic and oceanographic phenomenon, as opposed to a global diagenetic conspiracy. The temporal concordance of these profound events as preserved in strata from southern Namibia may thus be considered as exceptional geological markers for the base of the terminal Ediacaran.

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当生活变得艰难:后生动物生物矿化的环境驱动因素

在Pockenbank成员(纳米比亚)的钙质相中，生物矿化后生动物的突然出现似乎反映了氧化还原状态、钙浓度和海洋碱度的快速变化。一项重大的生物学创新与碳同位素深度漂移的结束相结合，支持了舒兰异常是一种构造和海洋学现象的观点，而不是全球成岩“阴谋”。因此，保存在纳米比亚南部地层中的这些深层事件的时间一致性可以被认为是埃迪卡拉纪晚期底部的特殊地质标志。Pockenbank成员(纳米比亚)石灰岩相中生物矿化后生动物的突然出现，似乎反映了海洋氧化还原状态、钙浓度和碱度的迅速变化。= =地理= =根据美国人口普查，这个县的面积为，其中土地面积为，其中土地面积为。这些events as preserved迅速的临时性concordance strata from纳米比亚南部可能因此被视为as特殊地质markers for The of The terminal Ediacaran基地。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Estudios Geologicos-Madrid GEOLOGY-

CiteScore

1.40

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Since 1945 Estudios Geologicos publishes original research works, as well as reviews, about any topic on Earth Sciences. Estudios Geologicos is published as one yearly volume, divided into two half-yearly issues. It is edited by the Spanish National Research Council (Consejo Superior de Investigaciones Científicas, CSIC) at the Instituto de Geociencias (CSIC-UCM). Estudios Geologicos provides free access to full-text articles through this electronic edition. Accepted articles appear online as "Forthcoming articles" as soon as the galley proofs have been approved by the authors and the Editor-in-Chief. No changes can be made after online publication.