干旱区生态环境知识资源中心(Arid): Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-weathering, Provenance and Tectonic Setting

Arid

DOI	10.1007/s12594-022-1962-9
	Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-weathering, Provenance and Tectonic Setting
	Sonowal, Poly; Khan, Tavheed; Gogoi, Mousumi; Kumar, T. Satish; Walling, Temsulemba; Phukan, Sarat
通讯作者	Phukan, S (corresponding author)，Gauhati Univ, Dept Geol Sci, Gauhati 781014, India.
来源期刊	JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
ISSN	0016-7622
EISSN	0974-6889
出版年	2022
卷号	98 期号:2 页码:219-231
英文摘要	Geochemical and mineralogical studies were carried out on the sandstones of the Eocene Kopili Formation, Shillong Plateau to evaluate paleo-weathering, provenance and tectonic setting. The study area is located on the bank of the Lubha River along the Badarpur-Jowai road section. The Kopili Formation is represented by a sequence of alternation of shales and sandstones. The sandstone beds are usually thin, fine grained, ferruginous and mostly parallel laminated. The thickness of the sandstone beds increases towards the top with decreasing numbers of shale beds. Petrographically the sandstones are dominated by monocrystalline and polycrystalline quartz followed by feldspar, mica and rock fragments. The matrix content does not exceed 15% and hence the sandstones can he classified as arenite. The Kopili sandstones are classified as quartz arenite to sublitharenite, and arkose to sublitharenite based on their petrographic and geochemical parameters respectively. Aren itic composition and high SiO2/Al2O3 ratio indicate that the Kopili sandstones are highly mature. The weathering indices mostly indicate low to moderate (except 49D sample) degree of chemical weathering under arid to semi humid climatic conditions. The major and trace element-based diagrams and their ratios indicate that the Kopili sandstone received sediments from felsic dominated source with minor contribution from basic source rocks and are deposited in tectonically passive margin setting.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000755129500013
WOS关键词	PENNSYLVANIAN-PERMIAN AGE ; SEDIMENTARY-ROCKS ; SILICICLASTIC SEDIMENTS ; GEODYNAMIC EVOLUTION ; INDIA IMPLICATIONS ; GREENSTONE-BELT ; CLASTIC ROCKS ; SHALES ; HILLS ; SR
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/2XILL650/376421
作者单位	[Sonowal, Poly; Gogoi, Mousumi; Phukan, Sarat] Gauhati Univ, Dept Geol Sci, Gauhati 781014, India; [Khan, Tavheed] CSIR Natl Geophys Res Inst, Geochem Div, Hyderabad 500007, India; [Kumar, T. Satish] Oil India Ltd, Ctr Excellence Energy Studies, Gauhati 781022, India; [Walling, Temsulemba] Nagaland Univ, Dept Geol, Kohima 797004, India
推荐引用方式 GB/T 7714	Sonowal, Poly,Khan, Tavheed,Gogoi, Mousumi,et al. Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-weathering, Provenance and Tectonic Setting[J],2022,98(2):219-231.
APA	Sonowal, Poly,Khan, Tavheed,Gogoi, Mousumi,Kumar, T. Satish,Walling, Temsulemba,&Phukan, Sarat.(2022).Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-weathering, Provenance and Tectonic Setting.JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA,98(2),219-231.
MLA	Sonowal, Poly,et al."Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-weathering, Provenance and Tectonic Setting".JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA 98.2(2022):219-231.