UPPER CISURALIAN-LOWER GUADALUPIAN BRACHIOPODS FROM THE QARARI UNIT, BATAIN PLAIN, NORTHEAST OMAN: SYSTEMATICS, PALAEOECOLOGY AND CORRELATION

IF 1.6 3区 地球科学 Q2 GEOLOGY
Marco Viaretti, A. Heward, A. Gementi, L. Angiolini
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引用次数: 2

Abstract

Permian brachiopods from Oman are well-known as valuable tools for correlation and palaeobiogeographical and palaeoclimatic reconstructions. Here, we describe a new brachiopod fauna from the Qarari Unit of the allochthonous Batain Group in northeast Oman. Brachiopods were collected from four localities: Wadi Khawr al Jaramah (WKJ), Jebel Qarari (JQ1), Jebel X (JX3) and Shiya (SH11). The age of the fossiliferous localities is wellconstrained to the late Kungurian-early Roadian by conodonts and fusulines, in agreement with the age suggested by the brachiopod ranges.The brachiopod fauna consists of 339 specimens belonging to 68 species of 8 orders, among which five species are here identified as new. Based on the taphonomic attributes and the analysis of the brachiopod life-styles, the assemblages from the Qarari Unit are interpreted as life assemblages thriving on varied substrates, with limited post-mortem exposure on the sea floor and rapid burial at depths around the storm wave base.Based on the generally high biodiversity indices (Shannon-Wiener and Margalef indices), the Qarari brachiopod fauna can be considered a biodiversity hotspot, only comparable, in term of biodiversity, to the coeval faunas from West Texas and South China. However, palaeobiogeographical affinities of the Qarari brachiopods with these faunas are scanty, as well as the affinities with coeval faunas from the northern Gondwana margin and the Cimmerian and Cathaysian blocks, except for some similarities with the upper Kungurian brachiopods of Myanmar. This may be explained by the fact that the Qarari succession was deposited in the Madagascan arm of Neo-Tethys, and thus rather isolated from the main Gondwanan margin.
阿曼东北部巴坦平原石英组上顺滑系-下瓜达鲁普系腕足动物:系统学、古生态学及对比
阿曼二叠纪腕足类是进行对比、古生物地理和古气候重建的宝贵工具。在这里,我们描述了阿曼东北部巴丹群Qarari单元的一种新的腕足动物群。腕足类从四个地方采集:Wadi Khawr al-Jaramah(WKJ)、Jebel Qarari(JQ1)、JebelX(JX3)和Shiya(SH11)。含化石地区的年龄被牙形刺和fusuline很好地限制在晚昆古里阶-早鲁地阶,与腕足类的年龄一致。腕足动物群包括339个标本,隶属于8目68种,其中5种为新物种。根据地震学属性和腕足动物生活方式的分析,Qarari单元的组合被解释为在各种基质上繁衍生息的生命组合,在海底的死后暴露有限,在风暴波基周围的深处快速埋葬。根据普遍较高的生物多样性指数(Shannon Wiener和Margalef指数),卡拉里腕足动物群可以被视为生物多样性热点,在生物多样性方面只能与德克萨斯州西部和中国南部的同时代动物群相媲美。然而,卡拉里腕足类与这些动物群的古生物地理亲缘关系,以及与冈瓦纳大陆北部边缘、齐默里阶和华夏阶同时代动物群的亲缘关系,除了与缅甸上昆古里阶腕足类有一些相似之处外,都很稀少。这可以解释为Qarari序列沉积在新特提斯的马达加斯加臂,因此与冈瓦纳大陆主边缘相当孤立。
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来源期刊
CiteScore
3.60
自引率
4.30%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.
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