安哥拉宽扎盆地 Sumbe 地区阿尔卑-土伦沉积物的古植物学:对古环境、古气候和古地理的影响

IF 1.9 3区 地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-07-01 DOI:10.1016/j.cretres.2024.105953
Cristina Rodrigues , Márcia Mendes , Zélia Pereira , Pedro Claude Nsungani , Paulo Fernandes , Luís Vítor Duarte , Belarmino Chitangueleca , Lúmen Sebastião , Benedito Aida , Davide Degli Esposti , Domingos Freitas
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引用次数: 0

摘要

在安哥拉宽扎盆地的 Sumbe 地区进行的古生物学调查在 Mucanzo、Cabo Ledo 和 Itombe 地层的 Quissonde Facie 的四个地段发现了阿尔卑斯至都龙纪的集合体。这些研究旨在确定它们的生物地层年龄,并推断古环境、古气候和古地理模型。Odontochitina costata、Palaeohystrichophora infusorioides 和 Xiphophoridium alatum 囊蚴的存在支持了 Mucanzo 地层的上白垩世至下新元古代年龄。在 Cabo Ledo 地层中发现的 Litosphaeridium siphoniphorum 囊体和 Elateroplicites africaensis 花粉表明该地层的年代为仙人纪,而 Conosphaeridium striatoconum、Heterosphaeridium difficile 和 Dinogymnium acuminatum 则支持伊通贝地层下部的年代为都元纪。所有样本都主要含有浮游植物降解产生的荧光无定形有机质(AOM),最上层单元的 AOM 越来越多,表明在缺氧-缺氧条件下的内海沉积。在下白垩世至中白垩世期间,冈瓦纳群岛的解体引起了重大变化,古植物学表明,该地区与特提斯亲缘关系密切,一些高纬度类群表明该地区分布于世界各地。集合体的亚热带至热带性质以及高纬度物种表明,白垩纪中期,中大西洋和南大西洋之间的水域连接一直延伸到宽扎盆地。
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Palynology of the Albian–Turonian sediments from the Sumbe region, Kwanza Basin (Angola): Implications for paleoenvironment, paleoclimate, and paleogeography

Palynological investigations in the Sumbe region of the Kwanza Basin, Angola, have identified Albian to Turonian assemblages in four sections of the Quissonde Facies of the Mucanzo, Cabo Ledo, and Itombe formations. These studies aimed to determine their biostratigraphic ages and infer paleoenvironmental, paleoclimatic, and paleogeographic models. The presence of Odontochitina costata, Palaeohystrichophora infusorioides, and Xiphophoridium alatum cysts supports an upper Albian to lower Cenomanian age for the Mucanzo Formation. Litosphaeridium siphoniphorum cyst and the Elateroplicites africaensis pollen found In the Cabo Ledo Formation suggest a Cenomanian age, while Conosphaeridium striatoconum, Heterosphaeridium difficile, and Dinogymnium acuminatum supports a Turonian age for the lower part of the Itombe Formation. All samples predominantly contain fluorescent amorphous organic matter (AOM) derived from phytoplankton degradation, with increasing AOM in the uppermost units, indicating inner neritic marine deposition under dysoxic-anoxic conditions. During the Lower to mid-Cretaceous, the Gondwana breakup caused significant changes, with the palynological indicating a Tethyan affinity with some high-latitude taxa, suggesting a cosmopolitan distribution. The subtropical to tropical nature of the assemblages, along with high-latitude species, indicates a mid-Cretaceous water connection between the Central Atlantic and the South Atlantic oceans, extending to the Kwanza Basin.

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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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