Advances in the Lower Ordovician of the western Iberian Chain, NE Spain

IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
J. Álvaro, Blanca Martínez-Benítez
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引用次数: 0

Abstract

The western Iberian Chain of NE Spain represents a lateral prolongation of the West AsturianLeonese Zone. As other proximal sectors fringing NW Gondwana, the chain comprises a con formable and continuous Furongian‒Tremadocian transition, comprising a thick (3600‒4500 m) Lower Ordovician sedimentary succession, exclusively composed of siliciclastic strata and deposited in mid-latitude (temperate) waters. Although the shelly fossil record is not abun dant, some key trilobites and brachiopods allow the identification of distinct biogeographic links with the Argentinian margin of West Gondwana, Oaxaca (Mexico), and the neighbouring Montagne Noire (France), with which a common biostratigraphic biozonation can be en vis aged. Two phosphoritic interbeds rich in linguliformean brachiopods punctuate the Valconchán and Borrachón formations, and represent event beds related to condensation processes and sedimentation of explosive ignimbritic tuffs, respectively.
西班牙东北部西伊比利亚链下奥陶统的进展
西班牙东北部的西伊比利亚链代表了西阿斯图里-莱昂带的横向延伸。与NW Gondwana相邻的其他近端板块一样,该链包括一个整合的连续的furonian - tremadocian过渡,包括一个厚(3600-4500米)的下奥陶统沉积序列,完全由硅屑地层组成,沉积在中纬度(温带)水域。虽然壳类动物的化石记录并不丰富,但一些关键的三叶虫和腕足类动物可以识别出与西冈瓦纳的阿根廷边缘、瓦哈卡(墨西哥)和邻近的黑山脉(法国)之间独特的生物地理联系,从而可以看到一个共同的生物地层生物带。两个富含舌状臂足类的磷质互层分别位于Valconchán组和Borrachón组,分别代表了与爆炸型火成岩凝灰岩凝聚作用和沉积作用有关的事件层。
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来源期刊
Estonian Journal of Earth Sciences
Estonian Journal of Earth Sciences 地学-地球科学综合
CiteScore
1.50
自引率
9.10%
发文量
11
审稿时长
>12 weeks
期刊介绍: The Estonian Journal of Earth Sciences is an international scientific open access journal published by the Estonian Academy of Sciences in collaboration with the Tallinn University of Technology, the University of Tartu, the Estonian University of Life Sciences and the Talllinn University. The journal publishes primary research and review papers in the English language. All articles are provided with short Estonian summaries. All papers to be published in the journal are peer reviewed internationally. The journal is open for publications in all fields of Earth sciences, including besides different geological sensu lato disciplines, also geography and oceanography having certain connection with our part of the world, North Europe and the Baltic area in particular.
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