Characteristics and paleoenvironmental indications of caddisfly larval cases-stromatolite bioherms in the Lower Cretaceous in Liupanshan Basin, Central China

IF 1.9 3区 地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-08-08 DOI:10.1016/j.cretres.2024.105973
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Abstract

Fossil caddisfly larval cases (CLCs) are of great significance for reflecting the habits of ancient caddisfly and indicating the paleoenvironment. Multiple layers with bioherms formed by fossil CLCs and stromatolites were found to be distributed in the Lower Cretaceous in Liupanshan Basin, Central China. In order to deeply understand the characteristics and formation environment of the CLCs-stromatolite bioherms, a series studies were conducted on the Yaoshan section in the northeastern of the basin. Morphological anatomy, mineralogy, element geochemistry, and isotope geochemistry are included in the studies. It reveals that the CLCs-stromatolite bioherms in Yaoshan are mainly composed of calcite and dolomite mineralogically, and CLCs and stromatolite morphologically.

In the bioherms, a large number of fossil CLCs stacked orderly, with a conical shape perpendicular to the stratum distribution. The bioherms were deposited in a semi-enclosed saline lake in hot and dry paleoclimate, and they were mainly formed during the periods when the evaporation increased, the water body became shallower, and the supply of terrestrial material increased.

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华中六盘山盆地下白垩统笛毛蝇幼虫-叠层石生物群落特征及古环境指示
蝶形花幼虫化石对反映古蝶形花的生活习性和古环境具有重要意义。在华中六盘山盆地下白垩统中,发现了由蝶形幼虫化石和叠层石形成的多层生物圈。为深入了解CLCs-叠层石生物圈的特征和形成环境,对盆地东北部的尧山剖面进行了系列研究。研究内容包括形态解剖、矿物学、元素地球化学和同位素地球化学。研究发现,瑶山CLCs-叠层石生物群在矿物学上主要由方解石和白云石组成,在形态学上主要由CLCs和叠层石组成。生物圈沉积在古气候干热的半封闭盐湖中,主要形成于蒸发量增加、水体变浅、陆地物质供应增加的时期。
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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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