干旱区生态环境知识资源中心(Arid): Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India

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DOI	10.1007/s12517-021-08638-3
	Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India
	Kumar, Alok; Singh, Alok K.; Paul, Debajyoti; Kumar, Abhishek
通讯作者	Singh, AK (corresponding author), Rajiv Gandhi Inst Petr Technol, Dept Petr Engn & Geoengn, Jais 229304, Amethi, India.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:22
英文摘要	This study provides detailed information about the geochemistry and coal petrography of Paleogene lignite deposits of Bikaner-Nagaur Basin and the Barmer Basin of Rajasthan, India, which have been used to reconstruct paleoclimatic, paleovegetational, and paleodepositional conditions. Petrographic characteristics show the dominance of huminite group macerals followed by inertinite and liptinite group macerals in Rajasthan lignites. The mean random huminite reflectance value (%Ro(m)) ranges from 0.27 to 0.33%, which put these lignites as low-rank lignite 'B'. 13C NMR spectra show sharp peaks in the aliphatic region, indicting immaturity of organic matter. These peaks confirm the presence of aliphatic CH2, aliphatic -CH3 bonding, protonated aromatic carbons, and oxygenated aromatic carbon atoms (Ar-O). delta C-13 values in xylite-rich lithotype range from - 25.04 to - 25.61 parts per thousand, indicating the contribution of gymnosperm plants (Taxodiaceae during) in peat. Whereas, delta C-13 in matrix-rich lithotype range from - 26.82 to - 27.44 parts per thousand, and show the presence of angiosperm taxa (Typhaceae, Iridaceae, and Gramineae) during peat formation in the study area. The samples dominated by huminite group macerals have a slightly low delta C-13 value than inertinite-rich samples. In contrast, the least delta C-13 value has been recorded in the liptinite rich samples. delta C-13 values also suggest C-3 plants to be the main peat-forming vegetation in the study area during the Paleogene. The mineralogical study indicates peat formation in semi-arid to slightly arid climatic conditions. The presence of framboidal pyrite, alginite, funginite macerals, and high sulfur content of the studied lignites indicate marine incursion in the basin.
英文关键词	Paleogene Lignite Organic petrography 13C NMR Carbon isotope (delta C-13) Paleoenvironment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000715949600003
WOS关键词	BIKANER-NAGAUR BASIN ; CARBON ISOTOPIC COMPOSITION ; LATE PERMIAN COALS ; STATE C-13 NMR ; WESTERN INDIA ; SAURASHTRA BASIN ; ORGANIC-MATTER ; GEOCHEMICAL CHARACTERIZATION ; SONGZAO COALFIELD ; THERMAL MATURITY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368203
作者单位	[Kumar, Alok; Singh, Alok K.] Rajiv Gandhi Inst Petr Technol, Dept Petr Engn & Geoengn, Jais 229304, Amethi, India; [Paul, Debajyoti; Kumar, Abhishek] Indian Inst Technol Kanpur, Dept Earth Sci, Kanpur 208016, Uttar Pradesh, India
推荐引用方式 GB/T 7714	Kumar, Alok,Singh, Alok K.,Paul, Debajyoti,et al. Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India[J],2021,14(22).
APA	Kumar, Alok,Singh, Alok K.,Paul, Debajyoti,&Kumar, Abhishek.(2021).Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India.ARABIAN JOURNAL OF GEOSCIENCES,14(22).
MLA	Kumar, Alok,et al."Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India".ARABIAN JOURNAL OF GEOSCIENCES 14.22(2021).