墨西哥东北部Aptian(下白垩统)首次发现的微腐化石Palaxius salataensis及其古生态学意义

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2020-04-11 DOI:10.1080/10420940.2020.1747060
M. Torres-Martínez, Fernando Núñez-Useche, R. Barragán
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引用次数: 0

摘要

salataensis微粪化石是虾酸虾产生的非骨骼碳酸盐颗粒。这种鱼的特征是:在两侧对称的平面上有四条纵管,横截面呈新月形。salataensis早前在国外和晚古生代至中生代地层中都有报道。在这项研究中,我们描述了该鱼种的第一个Aptian记录,北美白垩纪的第一个记录,以及世界范围内的第五个记录。salataensis在一种砾石-颗粒岩中发现,含有丰富的颗粒和常见的腹足类贝壳碎片和亚角状、分选差的内碎屑。古环境以高能量条件的浅水环境为特征,发生在风浪基与风浪基之间,靠近台地边缘,以富氧和富营养化条件为主。La Huasteca峡谷富含微腐化石的地层位于Cupido组上部鲕粒岩层的顶部,标志着早期阿普tian海洋缺氧事件1a (OAE 1a)的结束。P. salataensis在丘比多组上层的存在与有机质的有效性直接相关,而不是与氧的恢复有关。
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Ichnologic note first occurrence of the microcoprolite Palaxius salataensis in the Aptian (Lower Cretaceous) of northeast Mexico and its paleoecological implications
Abstract Microcoprolites of Palaxius salataensis are non-skeletal carbonate grains produced by callianassid shrimps. This ichnospecies is recognized by four longitudinal canals arranged around a bilateral plane of symmetry, with crescent outline in cross-section. Palaxius salataensis has been previously reported from other countries and in strata from the late Paleozoic to the Mesozoic. In this study, we describe the first Aptian record of the ichnospecies, the first Cretaceous occurrence in North America, and the fifth occurrence worldwide. Palaxius salataensis was found in a packstone-grainstone with abundant pellets and common gastropod shell fragments and subangular, poorly sorted intraclasts. The paleoenvironment was characterized by shallow-waters with high energy conditions, occurring between fair-weather wave base and storm wave base, close to the platform margin, where well-oxygenated and nutrient-rich conditions predominated. The microcoprolite-rich bed of the La Huasteca Canyon occurs on top of an oolitic grainstone interval in the upper levels of the Cupido Formation, interpreted as the termination of the early Aptian Oceanic Anoxic Event 1a (OAE 1a). The presence of P. salataensis in the upper levels of the Cupido Formation is directly related to the availability of organic matter rather than to oxygen recovery.
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来源期刊
CiteScore
2.50
自引率
12.50%
发文量
0
审稿时长
>12 weeks
期刊介绍: The foremost aim of Ichnos is to promote excellence in ichnologic research. Primary emphases center upon the ethologic and ecologic significance of tracemaking organisms; organism-substrate interrelationships; and the role of biogenic processes in environmental reconstruction, sediment dynamics, sequence or event stratigraphy, biogeochemistry, and sedimentary diagenesis. Each contribution rests upon a firm taxonomic foundation, although papers dealing solely with systematics and nomenclature may have less priority than those dealing with conceptual and interpretive aspects of ichnology. Contributions from biologists and geologists are equally welcome. The format for Ichnos is designed to accommodate several types of manuscripts, including Research Articles (comprehensive articles dealing with original, fundamental research in ichnology), and Short Communications (short, succinct papers treating certain aspects of the history of ichnology, book reviews, news and notes, or invited comments dealing with current or contentious issues). The large page size and two-column format lend flexibility to the design of tables and illustrations. Thorough but timely reviews and rapid publication of manuscripts are integral parts of the process.
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