Santonian-Campanian dinoflagellate cyst biostratigraphy and paleoenvironment of the Krishna-Godavari Basin, India

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2022-03-30 DOI:10.1111/iar.12443
Ashish K. Mishra, Arun Deo Singh, Vandana Prasad
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Abstract

The present study deals with the biostratigraphic framework of Late Cretaceous sediments of the subsurface Well (DNG) “A” (2085–1840 m depth) from the Raghavapuram/Chintalapalli Shale of the Krishna-Godavari Basin and analyzed the palynological assemblage. The recorded palynological assemblage is dominated by marker dinoflagellate cyst viz. Areoligera coronata, Areoligera senonensis, Heterosphaeridium spinaconjunctum, Nelsoniella aceras, Nelsoniella semireticulata, Odontochitina porifera, Xenascus ceratioides, and Xenascus gochtii species. The last occurrence (LO) of significant species of dinoflagellate cysts is considered for the biostratigraphic establishment. On the basis of dinoflagellate cyst biostratigraphy, the examined sequences correspond to the Santonian-Campanian age. The dominance of gonyaulacoid dinoflagellate cysts is interpreted in terms of sea-level fluctuation and other paleoenvironmental signals through this biostratigraphic establishment. The recorded dinoflagellate cysts indicate the outer neritic, cool depositional environment. The sea-level rise, recorded in our study is linked with the transgressive phase during the Late Cretaceous (Santonian-Campanian) period.

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印度Krishna‐Godavari盆地Santonian‐Campanian甲藻囊生物地层学和古环境
本研究涉及地下井(DNG)“A”(2085–1840)晚白垩世沉积物的生物地层学框架 m深度),并分析了孢粉组合。已记录的孢粉组合主要由标志性甲藻囊肿组成,即冠藻Areoligera coronata、senonensis Areoliger、刺突异球藻Heterospheridium spinaconcynjectum、针叶Nelsoniella aceras、半网状Nelsoniela、多孔Odontochitina porifera、角状Xenascus ceratioides和戈氏Xenascuss gochtii物种。重要物种甲藻囊肿的最后一次出现(LO)被认为是生物地层学的建立。根据甲藻囊肿生物地层学,所检查的序列对应于Santonian‐Campanian时代。通过这一生物地层学建立,从海平面波动和其他古环境信号的角度解释了gonyaulacoid甲藻囊肿的优势。记录到的甲藻囊肿表明了外部浅海、凉爽的沉积环境。我们的研究中记录的海平面上升与晚白垩世(Santonian‐Campanian)时期的海侵阶段有关。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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