Paleoecology and Predominance Facies of Late Devonian Foraminifera in Successions of the Catskill Delta Complex, Western New York, U.S.A.

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
I-Hsien Li, K. Bartlett, C. Kowalski, Paul Bembia, K. C. Meehan
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引用次数: 2

Abstract

Beyond yielding signals of extinction or stressed ecological conditions, modern and ancient foraminiferal assemblages reflect specific marine depositional environments and depths. Foraminiferal predominance facies and benthic foraminiferal depth zonation has been successfully used to identify specific marine environments dating back to the Carboniferous. Using insights from modern equivalents, correlative assemblages allow for paleoecological analysis and insights. Middle to Late Devonian (Frasnian) black and gray shale beds of western New York contain hundreds of diminutive calcareous and agglutinated foraminifera. The genera within these beds are reminiscent of shallow modern predominance facies. These foraminiferal assemblages and their associated predominance facies correlate well with prior lithologic and geochemical investigations that establish this portion of the Appalachian Basin as a deltaic setting but suggest it is likely inner neritic zone. Dominant genera include several species of Ammobaculites and Saccammina which suggest that paleodepths did not exceed 50 m throughout the Frasnian. Opportunistic genera reflect a muted crisis associated with the punctata isotopic event (Rhinestreet Event) and Lower Kellwasser (Pipe Creek) events. While there are definite shifts in the diversity of assemblages between gray and black shale, the foraminiferal type and feeding mode, indicative of depth and oxygen availability respectively, there is little variation between the distinct shale units. No significance was found between total organic carbon and foraminiferal type of feeding mode. Identification at the species level is problematic but assemblages at the genus-level suggest that the depositional environment was stressed. However, the effects of these marine crisis events were not significant for these foraminifera in comparison to those frequently reported; we found no local extinction for foraminifera at least through the lower Hanover Shale, just prior to the Hangenberg marine crisis event, within this deltaic complex of the Appalachian Basin in western New York.
美国纽约西部卡茨基尔三角洲杂岩序列中晚泥盆世有孔虫古生态学及优势相
现代和古代有孔虫组合除了提供灭绝或生态条件紧张的信号外,还反映了特定的海洋沉积环境和深度。有孔虫优势相和底栖有孔虫深度分带已成功地用于确定可追溯到石炭纪的特定海洋环境。利用现代同类的见解,相关的组合允许进行古生态分析和见解。纽约西部中至晚泥盆世(弗拉斯纪)黑色和灰色页岩床含有数百种小型钙质和凝集有孔虫。这些层内的属使人想起浅层现代优势相。这些有孔虫组合及其相关的优势相与先前的岩性和地球化学研究相吻合,这些研究将阿巴拉契亚盆地的这一部分确定为三角洲环境,但表明它可能是内浅海带。优势属包括若干种Ammobaculites和Saccammina,这表明整个Frasnian的古深度不超过50 m。机会主义属反映了与点状同位素事件(Rhinestreet事件)和Lower Kellwasser (Pipe Creek事件)相关的温和危机。虽然灰色页岩和黑色页岩的组合多样性、有孔虫类型和供氧模式(分别指示深度和氧可用性)存在明显的变化,但不同页岩单元之间的变化不大。总有机碳与有孔虫取食方式无显著关系。在物种水平上的鉴定是有问题的,但在属水平上的组合表明沉积环境受到了压力。然而,与那些经常报道的相比,这些海洋危机事件对这些有孔虫的影响并不显著;我们没有发现有孔虫的局部灭绝,至少在汉诺威页岩下游,就在汉根堡海洋危机事件之前,在纽约西部阿巴拉契亚盆地的这个三角洲综合体内。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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