阿根廷中西部宾夕法尼亚产腕足类新分类群：jachalensis-Streptorhynchus inaequiornatus带生物地层学和古生物地理学意义

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-08-05 DOI:10.1016/j.jsames.2025.105727

Abner A. Calle Salcedo , Gabriela A. Cisterna , Karen Halpern

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引用次数: 0

摘要

阿根廷Río Blanco盆地圣胡安省石炭纪Quebrada Larga组腕足类两新种：这些新种增加了Tivertonia jachalensis-Streptorhynchus inaequiornatus带（TS, Moscovian-Kasimovian?）已知的腕足动物多样性，并有助于分析其在阿根廷中西部盆地（即western Paganzo， Río Blanco， Calingasta-Uspallata和San Rafael盆地）的组成变化和分布模式。通过对该地区13个地区的腕足动物的分布数据库进行分析，将其分为3个主要类群，以确定其组成在南北纬度梯度上的变化。这种多样性格局也受到环境特征（即水深梯度和养分有效性）的影响，这些环境特征与冈瓦纳这部分地区晚石炭世-早二叠纪时期的气候改善有关。

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New taxa of Pennsylvanian productide brachiopods from west-central Argentina: Implications for biostratigraphy and paleobiogeography in the Tivertonia jachalensis-Streptorhynchus inaequiornatus Zone

Two new species of productide brachiopods are described from the Carboniferous Quebrada Larga Formation, San Juan Province, in the Río Blanco Basin, Argentina: Brachiosvalbardia archboldi sp. nov. and Coronalosia vergelae sp. nov. These new species increase the known brachiopod diversity of the Tivertonia jachalensis-Streptorhynchus inaequiornatus Zone (TS, Moscovian-Kasimovian?) and contribute to the analysis of its compositional variations and distribution patterns across the central western Argentinian basins (i.e., Western Paganzo, Río Blanco, Calingasta-Uspallata, and San Rafael basins). Analysis of an occurrence database of brachiopods from the TS Fauna, including 22 genera from 13 localities in these basins, were grouped into three major groups that allow the identification of compositional variations along the north-south latitudinal gradient. This diversity pattern is also influenced by environmental features (i.e., bathymetric gradient and nutrient availability) related to the climatic amelioration registered in this part of Gondwana during the late Carboniferous-early Permian interval.

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.