干旱区生态环境知识资源中心(Arid): Micromorphology and major element geochemistry of calcretes in the Thoppukulam mine section, Sathankulam region, Southern Tamil Nadu, India: implications on depositional environment

Arid

DOI	10.1007/s12517-019-4544-4
	Micromorphology and major element geochemistry of calcretes in the Thoppukulam mine section, Sathankulam region, Southern Tamil Nadu, India: implications on depositional environment
	Velmayil, Perumal; Venu, Udayanapillai Alagaiah
通讯作者	Velmayil, Perumal
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2019
卷号	12 期号:12
英文摘要	The origin of carbonate sediments in continental region is subjected to numerous environmental controls. The calcrete is impure limestones which are formed within the regolith part either by evapotranspiration of alkaline-rich groundwater or by pedogenic leaching of surface water under arid and semi-arid climatic condition. Widespread deposits of calcrete profile occur between the Tertiary calcareous sandstone basement and Recent-Sub-Recent top red teri soil deposit located at Thoppukulam village, Southern Tamilnadu, India. The general sequential stratigraphic successions which were observed in and around the study area are given. The field observation proves the undulating occurrence of sub-surface calcrete profile which is in the form of dome (Sivalingam)-shaped structure below the teri soil. The undulation characteristics of calcrete below teri soil represent the differential evapotranspiration process of groundwater derived from the Tertiary calcareous sandstone aquifer. The macroscopic characters of calcrete appear as rhizome concretion, gravel, massive, oolitic, laminated, and chalky forms. The micromorphology of calcrete reveals calcified peloid, colloform, lensoidal, and rimming features with the clasts of quartz and clay, microtubules, calcified microcystis, calcified fungal hyphae, septarian nodule, and dendritic impregnation of deep brown sesquioxide mineral. The major element geochemistry of calcrete profile indicates CaO, SiO2, Al2O3, and Fe2O3 are in an elevated concentration above 1% than the other oxides, such as Na2O, K2O, MnO, MgO, TiO2, and P2O5. The major element geochemistry of two calcrete profile sections illustrates the geochemical implications and depositional environment.
英文关键词	Calcrete profile Evapotranspiration Pedogenic leaching Major element geochemistry Micromorphology
类型	Article
语种	英语
国家	India
收录类别	SCI-E
WOS记录号	WOS:000471224500001
WOS关键词	SEDIMENTARY-ROCKS ; SOILS ; CARBONATES ; PROVENANCE ; MINERALOGY ; PALEOSOLS ; GENESIS ; MEXICO ; SANDS ; BASIN
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/2XILL650/214334
作者单位	Alagappa Univ, Dept Geol, Karaikkudi 630003, Tamil Nadu, India
推荐引用方式 GB/T 7714	Velmayil, Perumal,Venu, Udayanapillai Alagaiah. Micromorphology and major element geochemistry of calcretes in the Thoppukulam mine section, Sathankulam region, Southern Tamil Nadu, India: implications on depositional environment[J],2019,12(12).
APA	Velmayil, Perumal,&Venu, Udayanapillai Alagaiah.(2019).Micromorphology and major element geochemistry of calcretes in the Thoppukulam mine section, Sathankulam region, Southern Tamil Nadu, India: implications on depositional environment.ARABIAN JOURNAL OF GEOSCIENCES,12(12).
MLA	Velmayil, Perumal,et al."Micromorphology and major element geochemistry of calcretes in the Thoppukulam mine section, Sathankulam region, Southern Tamil Nadu, India: implications on depositional environment".ARABIAN JOURNAL OF GEOSCIENCES 12.12(2019).