Eocene foraminifers of the Naga Hills of Manipur, Indo-Myanmar Range (IMR): Implications on age and basin evolution

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Eocene foraminifers of the Naga Hills of Manipur, Indo-Myanmar Range (IMR): Implications on age and basin evolution

机译：印度－缅甸山脉（IMR）曼尼普尔邦纳迦山的始新世有孔虫：对年龄和盆地演化的影响

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The Disang Group incorporates the oldest Cenozoic clastic sedimentary rocks that crop out in a series of NNE SSW trending ridges and valleys throughout much of the Naga Hills. The stratigraphic position of this unit is not well constrained due to a paucity of definitively recognisable, in situ fossils. We report forty-four species attributable of twenty-eight genera. Based on our new reported foraminiferal assemblages, we refine the age and paleoenvironmental interpretations for the Upper Disang Formation. We recognize Planktonic Foraminiferal Zones E14-16 correlative to upper middle Eocene to upper Eocene in the Upper Disang Formation within the Naga Hills. A basin model for this lithological unit involving an upper bathyal bathymetry, rapidly shallowing in a restricted basin with slump deposits where anoxic conditions prevailed is proposed based on field observations, foraminiferal assemblages, and published data.

机译：迪桑集团整合了最古老的新生代碎屑沉积岩，这些岩屑生长在整个纳迦丘陵的一系列NNE SSW趋势山脊和山谷中。由于缺乏明确可识别的原地化石，因此该单元的地层位置没有得到很好的限制。我们报告了二十四属的四十四种。基于我们新报道的有孔虫组合，我们完善了上迪桑组的年龄和古环境解释。我们认识到与纳卡丘陵上迪桑组中的上中新世到上新世有关的浮游有孔虫带E14-16。基于现场观测，有孔虫组合和已发表的数据，提出了该岩性单元的盆地模型，该模型涉及上层深海测深法，在缺氧条件普遍存在的坍落沉积物受限的盆地中迅速变浅。

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《Journal of Asian earth sciences》 |2020年第15期|104259.1-104259.13|共13页
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Wadia Inst Himalayan Geol 33 GMS Rd Dehra Dun 248001 Uttarakhand India;

Univ Queensland Sch Earth & Environm Sci Brisbane Qld 4072 Australia;

KDMIPE ONGC Paleontol Div Geol Grp Dehra Dun 248001 Uttarakhand India;

Directorate Geol & Min Dimapur 797112 Nagaland India;

Sri Sannidhi Grand Prabhu Gardens JN Rd Rajahmundry 533103 AP India;

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正文语种 eng
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关键词
Anoxia; Eocene; Manipur; Naga Hills; Upper Disang Formation; Planktonic foraminifers;

机译：缺氧;始新世马尼布尔娜迦山上迪桑组;浮游有孔虫;

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Eocene foraminifers of the Naga Hills of Manipur, Indo-Myanmar Range (IMR): Implications on age and basin evolution

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