Paleontology of Pennsylvanian transgressive deposits in northwestern Precordillera, San Juan province, Argentina

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2024-10-01 DOI:10.1016/j.jsames.2024.105178

V.S. Perez Loinaze , S.N. Césari , C.O. Limarino , L. Fauqué

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引用次数: 0

Abstract

In central-western Argentina, sedimentological and paleontological studies have identified changes in sea levels during the Pennsylvanian period. After the late Serpukhovian-early Bashkirian postglacial transgression, two main flooding events occurred. Among these, Pennsylvanian transgressions 1 and 2 are considered the most significant. New palynological samples recovered from the T1 transgression in Puesto Volcán, western Precordillera (San Juan province) reveal the presence of the Raistrickia densa-Convolutispora muriornata (DM) Biozone. The palynofloras are characterized by the recognition of Ahrensisporites cristatus, Lundbladispora spp., Raistrickia densa, Spelaeotriletes ybertii, and monosaccate pollen grains. The composition of the assemblages includes some taeniate pollen grains suggesting their assignment to the Subzone B. A new orthoconic cephalopod was also identified in the same stratigraphic interval, which adds to the invertebrate faunal record and confirms the marine environment. Imprints of foliage of Fedekurtzia argentina complete the paleofloristic assemblage. A late Bashkirian-earliest Moscovian age is suggested according to the well constrained radiometric control of the palynostratigraphy in the region.

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阿根廷圣胡安省 Precordillera 西北部宾夕法尼亚横切沉积的古生物学研究

在阿根廷中西部，沉积学和古生物学研究确定了宾夕法尼亚时期海平面的变化。在晚塞尔普霍维世-早巴什基尔世后冰期断裂之后，发生了两次主要的洪水泛滥事件。其中，宾西法尼亚第 1 次和第 2 次跃迁被认为是最重要的。在 Precordillera 西部（圣胡安省）Puesto Volcán，从 T1 回归期采集的新古生物样本揭示了 Raistrickia densa-Convolutispora muriornata (DM) 生物区的存在。古植物群落的特征是发现了Ahrensisporites cristatus、Lundbladispora spp.、Raistrickia densa、Spelaeotriletes ybertii和单囊花粉粒。在同一地层区间还发现了一种新的正口头足纲动物，这增加了无脊椎动物的记录，并证实了海洋环境。阿根廷Fedekurtzia的叶片印迹完善了古植物组合。根据对该地区古地层的辐射控制，推测该地区的年代为巴什基尔晚期-莫斯科早期。

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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.