干旱区生态环境知识资源中心(Arid): Biotic response to environmental shift during the Permian-Triassic transition: Assessment from organic geochemical proxies and palynomorphs in terrestrial sediments from Raniganj Sub-basin, India

Arid

DOI	10.1016/j.palaeo.2021.110483
	Biotic response to environmental shift during the Permian-Triassic transition: Assessment from organic geochemical proxies and palynomorphs in terrestrial sediments from Raniganj Sub-basin, India
	Bhattacharya, Sharmila; Ankit, Yadav; Murthy, Srikanta; Kushwaha, Vasudev
通讯作者	Bhattacharya, S (corresponding author), Indian Inst Sci Educ & Res Mohali, Dept Earth & Environm Sci, Sect 81, Mohali 140306, Punjab, India.
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2021
卷号	576
英文摘要	The Permian-Triassic (P/T) mass extinction qualifies as the severest biotic perturbation in the history of our planet. Biomarkers, stable isotopes and palynomorphs are excellent proxies offering glimpses into palaeobiota and past ecosystems. These were investigated from coal-bearing upper Permian (Raniganj Formation) and Lower Triassic (Panchet Formation) Gondwana sediments recovered from the Raniganj Sub-basin, eastern India. The geochemical and palaeobotanical data suggest a shift in the terrestrial vegetation during the Early Triassic. A distinct change occurs from high abundance of n-C-23 and n-C-25 alkanes and higher CPI values in the upper Permian sediments to predominantly n-C-27 and n-C-29 alkanes along with relatively lower CPI values in the Lower Triassic. A sharp decline of the diterpenoid compounds and Glossopteridales pollens with a concomitant rise in lycopsid spores in the Lower Triassic sediments reflects the waning of a gymnosperm-dominated mire and onset of a stressed environment. Unlike the Glossopteridales, the Coniferales appear to be a resilient floral group with several new genera adapting to the growing arid conditions in the Early Triassic. The microbial community also responded to the contemporaneous ecosystem shift, with higher concentration of C-27 sterane relative to C-29 sterane in Lower Triassic sediments indicating proliferation of algal phytoplankton. The decreasing moretane/hopane (M/H) suggests that the soil bacteria were adversely affected plausibly due to enhanced soil erosion at the early part of the Triassic. A marked shift in the bulk isotopic composition (delta C-13(org)) from higher values in the upper Permian sediments (-21.0 to -24.1 parts per thousand) to lower values in the Lower Triassic sediments (-21.2 to -32.5 parts per thousand) is diagnostic of a vegetation changeover as a result of environmental deterioration. This is the first integrated study using molecular organic geochemical proxies and palynology from terrestrial Gondwana sediments in the Indian subcontinent, designed to investigate the pattern of floral and microbial restructuring as a result of an environmental shift during the Permian-Triassic transition.
英文关键词	Biomarkers Bulk carbon isotope Spores Pollen Vegetation turnover Palaeoenvironment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000668458200021
WOS关键词	N-ALKANE DISTRIBUTIONS ; CARBON-ISOTOPE STRATIGRAPHY ; PHOTIC-ZONE EUXINIA ; MASS-EXTINCTION ; KAROO-BASIN ; SIBERIAN TRAPS ; 2 EPISODES ; PANTHALASSIC OCEAN ; VEGETATION HISTORY ; BOUNDARY SECTIONS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368529
作者单位	[Bhattacharya, Sharmila; Ankit, Yadav; Kushwaha, Vasudev] Indian Inst Sci Educ & Res Mohali, Dept Earth & Environm Sci, Sect 81, Mohali 140306, Punjab, India; [Murthy, Srikanta] Birbal Sahni Inst Palaeosci, 53 Univ Rd, Lucknow 226007, Uttar Pradesh, India
推荐引用方式 GB/T 7714	Bhattacharya, Sharmila,Ankit, Yadav,Murthy, Srikanta,et al. Biotic response to environmental shift during the Permian-Triassic transition: Assessment from organic geochemical proxies and palynomorphs in terrestrial sediments from Raniganj Sub-basin, India[J],2021,576.
APA	Bhattacharya, Sharmila,Ankit, Yadav,Murthy, Srikanta,&Kushwaha, Vasudev.(2021).Biotic response to environmental shift during the Permian-Triassic transition: Assessment from organic geochemical proxies and palynomorphs in terrestrial sediments from Raniganj Sub-basin, India.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,576.
MLA	Bhattacharya, Sharmila,et al."Biotic response to environmental shift during the Permian-Triassic transition: Assessment from organic geochemical proxies and palynomorphs in terrestrial sediments from Raniganj Sub-basin, India".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 576(2021).