干旱区生态环境知识资源中心(Arid): Petrography and tectonic provenance of the Miocene Surma Group in parts of the Naga-Manipur hills, in and around Nungba,Northeast India

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	Petrography and tectonic provenance of the Miocene Surma Group in parts of the Naga-Manipur hills, in and around Nungba,Northeast India
	Sangeeta Angom; Pandey N; Kingson Oinam
来源期刊	Acta Geochimica
ISSN	2096-0956
出版年	2019
卷号	38 期号:6 页码:834-847
英文摘要	The Miocene molassic Surma sandstones in parts of the Naga-Manipur hills, in and around Nungba,Northeast India have been studied for their tectonic provenance using petrography and heavy mineral contents. The poorly-to-moderately-sorted sub-litharenite to lithicarkose type Surma sandstones display predominance of monocrystalline quartz(av. 61%)and include undulose and non-undulose varieties and almost equal amounts of feldspars(av. 22%)and rock fragments(av. 17%). The heavy mineral suite of Surma sandstones is dominated by transparent varieties(96%)that include garnet, zircon, tourmaline,rutile, staurolite, scapolite, phlogopite,chondrodite, humite, wollastonite, hedenbergite. sphene,chlorite, sillimanite, glauconite, glaucophane, and chloritoid. These heavy minerals characterize the granitic and silicic metamorphic complexes(GM)as well as the basic metamorphic rocks(MT)like greenstones, green schist,and amphibolites relating to passive continental margin setup. The opaque grains constitute nearly 4% of the total heavy minerals. The presence of euhedral, as well as abraded heavy mineral grains, further supports a mixed provenance having substantial contribution from sedimentary and metamorphic rocks. A ZTR index of approximately 45% indicates mineralogically sub-mature nature of Surma sandstones. Based on the light and heavy mineral suites coupled with the type of terrain available in the vicinity of the study area, it may be visualized that the sediment supply was largely made by the Himalaya, the IMR, the Shillong plateau, and the Mikir Hills under the influence of semi-arid to semi-humid climatic conditions. An overall supply from a recycled orogen provenance has been envisaged.
英文关键词	Petrography Tectonic provenance Miocene Surma Group Naga-Manipur hills Nungba, Northeast India
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Geology
CSCD记录号	CSCD:6623215
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336224
作者单位	Sangeeta Angom, Department of Earth Science, Assam University, Silchar, 788011, India.; Pandey N, Department of Earth Science, Assam University, Silchar, 788011, India.; Kingson Oinam, Department of Earth Science, Pondicherry University, Puducherry, 605014, India.
推荐引用方式 GB/T 7714	Sangeeta Angom,Pandey N,Kingson Oinam. Petrography and tectonic provenance of the Miocene Surma Group in parts of the Naga-Manipur hills, in and around Nungba,Northeast India[J],2019,38(6):834-847.
APA	Sangeeta Angom,Pandey N,&Kingson Oinam.(2019).Petrography and tectonic provenance of the Miocene Surma Group in parts of the Naga-Manipur hills, in and around Nungba,Northeast India.Acta Geochimica,38(6),834-847.
MLA	Sangeeta Angom,et al."Petrography and tectonic provenance of the Miocene Surma Group in parts of the Naga-Manipur hills, in and around Nungba,Northeast India".Acta Geochimica 38.6(2019):834-847.