巴西米纳斯吉拉斯州包鲁组玛丽亚地层恐龙肋骨的岩石学和古生物学研究

IF 1.9 3区 地球科学 Q1 GEOLOGY
Vinícius José Maróstica Paio , Isabela Jurigan , Rafael Delcourt , Rafael Souza de Faria , Alessandro Batezelli , Fresia Ricardi-Branco
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引用次数: 0

摘要

包鲁群(坎帕尼亚-马斯特里赫特)是南美洲白垩纪化石记录最丰富的地区之一。该单元的所有恐龙化石都被归入金龙类,其中大部分化石保存较差。我们介绍了对米纳斯吉拉斯州西部马里利亚地层恐龙背肋骨片段的组织学和岩石学分析。我们制作了薄片来描述骨组织的微观结构以及保存标本的化石过程。此外,还进行了元素分析,以验证化石和岩石基质的化学成分。在肋骨皮层中发现了哈弗斯骨,没有发现生长痕迹或外部基本系统。由于肋骨呈板状和椭圆形横截面,它很可能属于萨里斯恐龙。我们推断出了有关岩石学过程的假设。根据骨骼外表面的大量断裂和磨损痕迹,推断出骨骼经过了长时间的地下暴露,随后进行了高能量迁移。黄铁矿假形体(framboids)表明骨骼是在还原环境中沉积的。埋藏后,方解石的快速沉淀和碱性稳定性使得磷灰石在重结晶阶段得以保存。在早期成岩过程中,氢氧化锰沉积在磷灰石晶体上。我们得出的结论是,肋骨化石呈现出包鲁群脊椎动物化石中常见的岩石学偏向,这与骨骼暴露于干旱和半干旱气候、骨骼被搬运到沉积环境中以及化石成岩过程中的地层影响有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Taphonomy and paleohistology of a dinosaur rib from Marília Formation, Bauru Group, in the state of Minas Gerais, Brazil

The Bauru Group (Campanian–Maastrichtian) has one of the richest fossil records of Cretaceous in South America. All dinosaur fossils from this unit were assigned to Saurischia, most of them poorly preserved. We present the histological and taphonomic analysis of a dinosaur dorsal rib fragment from the Marília Formation in the western state of Minas Gerais. Thin sections were prepared to describe the microstructures of the bone tissue and the fossilization processes involved in preserving the specimen. An elemental analysis was also performed to verify the chemical composition of the fossil and rock matrix. Haversian bone was identified in the rib cortex, and no growth marks or an external fundamental system were found. The rib probably belonged to a saurischian dinosaur because of its plank shape and elliptical cross-section. Hypotheses regarding taphonomic processes were inferred. An extended period of subaerial exposure, followed by high-energy transport, was interpreted due to extensive fractures and signs of abrasion on the outer surface of the bone. Pyrite pseudomorphs (framboids) indicate that the bone was deposited in a reductive environment. After burial, the rapid precipitation of calcite and alkaline stability allowed the preservation of apatite during the recrystallization phase. The manganese hydroxides were deposited on apatite crystals during early diagenesis. We concluded that the fossil rib presented a common taphonomic bias identified among vertebrate fossils of the Bauru Group, which is associated with the exposure of the bones to arid and semiarid climates, their transport into the depositional environments and pedogenetic influence during fossil diagenesis.

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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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