印度东北部梅加拉亚邦晚古新世-早始新世剖面的大型底栖有孔虫和微相

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
Christer Dominique Pereira, S. Khanolkar, Santanu Banerjee, E. Özcan, P. Saraswati
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引用次数: 5

摘要

对印度东北部梅加拉亚邦Lakadong石灰岩(Mawmluh采石场)和Umlatdoh石灰岩(Komorrah采石场)的晚古新世-早始新世剖面进行了大型底栖有孔虫微相和碳同位素研究。我们使用更大的底栖有孔虫生物地层学生成了高分辨率的年龄模型,并记录了微相的变化。sbz3 (~ 58 ~ 60.7 Ma)和sbz4 (56 ~ 58ma)的LBF微相以杂藻、Glomalveolina、Ranikothalia、orthophragminids、dasycladalean绿藻和珊瑚红藻为主,表明沉积发生在斜坡内至中斜坡环境。沉积环境从开放海相拉孔洞灰岩到封闭海相拉孔洞砂岩跨越始新世纪的突变,可能表明始新世纪之后极端温暖时期的水文循环发生了重大变化。早始新世(SBZ 7-9,对应55.1-52.8 Ma),梅加拉亚邦持续海相沉积,形成了以halimmeda、Alveolina和百万粒岩为主的Umlatdoh灰岩。在梅加拉亚盆地,以晚古新世Ranikothalids和Glomalveolinids的灭绝和早始新世Umlatdoh石灰岩的Alveolinids和discocylinder的灭绝为标志,表明了更大的有孔虫灭绝和起源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Larger Benthic Foraminifera and Microfacies of Late Paleocene - Early Eocene Sections in Meghalaya, Northeast India
The Late Paleocene-Early Eocene sections from Lakadong Limestone (Mawmluh Quarry) and Umlatdoh Limestone (Komorrah Quarry) in Meghalaya, Northeast India were examined for larger benthic foraminiferal microfacies and carbon isotopes. We generated high-resolution age models using larger benthic foraminifera biostratigraphy and recorded the change in microfacies. The LBF microfacies in SBZ 3 (∼58–60.7 Ma) and SBZ 4 (56–58Ma) is dominated by Miscellanea, Glomalveolina, Ranikothalia, orthophragminids, dasycladalean green algae and coralline red algae, indicating that deposition occurred within inner to mid-ramp environments. An abrupt shift in the depositional setting from open marine Lakadong Limestone to restricted marine Lakadong Sandstone across the PETM possibly indicates major changes in hydrological cycle during the extreme warmth that followed the PETM. The marine sedimentation continued during the Early Eocene (SBZ 7–9 corresponding to 55.1–52.8 Ma) within Meghalaya that led to the formation of Umlatdoh Limestone dominated by Halimeda, Alveolina, and miliolids. The larger foraminiferal extinction and origination in the Meghalaya basin is marked by the extinction of late Palaeocene Ranikothalids, Glomalveolinids, dominating the Lakadong Limestone and the dominance of Alveolinids and Discocylinids in the early Eocene Umlatdoh Limestone.
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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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