Geochemistry and geodynamic setting of Paleoproterozoic granites of Lesser Garhwal Himalaya, India

Mishra, Sumit; Singh, Vinod K.; Слабунов, А. И.; Nainwal, H. C.; Singh, Pradip K.; Chaudhary, Neeraj; Nainwal, Deepak

doi:10.25299/jgeet.2019.4.2-2.2138

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…The scarce old cores of zircons can be divided into three age groups: Paleoarchean (3.52 Ga), Neoarchean (2.78 Ga and 2.62 Ga), and Paleoproterozoic (2.1 Ga). This diversity suggests that granites originated from sediments formed by the destruction of rocks varying in age from Paleoarchean to Paleoproterozoic and supports the notion that these granites are S-type granites [50].…”

Section: Discussionsupporting

confidence: 71%

Zircons from Collisional Granites, Garhwal Himalaya, NW India: U–Th–Pb Age, Geochemistry and Protolith Constraints

et al. 2021

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In the present work, we studied zircons from the less foliated granites of the Chail Group, which form a thrust sheet of the Lesser Himalayan Sequences, Garhwal region. Compositionally, these granites are S–type, formed in a collisional tectonic setting. Zircons possess an internal structure, mineral inclusions, and geochemical characteristics typical of magmatic origin. The U–Th–Pb geochronology and geochemistry were assessed using the laser ablation multi–collector inductively coupled plasma spectrometry (LA–ICP–MS) technique. U–Th–Pb isotope dating of zircons from two different samples revealed their age, estimated from the upper intersection of the discordia, to be 1845 ± 19 Ma. Zircons from one sample contained inherited cores belonging to three age groups: Paleoarchean (3.52 Ga), Neoarchean (2.78 Ga and 2.62 Ga), and Paleoproterozoic (2.1 Ga). Zircons with ages of 3.52, 2.62, and 2.1 Ga were interpreted as magmatic based on their geochemical characteristics. The 2.78 Ga core was interpreted as metamorphic. The observed inheritance is consistent with the melting of sedimentary rocks. The inherited zircons could have originated from Aravalli and Bundelkhand Craton and Paleoproterozoic Aravalli Fold Belt rocks. This confirms that the studied granites are S–type and could have been formed in a collisional environment at 1.85 Ga on the western flank of the Columbia Supercontinent.

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Section: Discussionsupporting

confidence: 71%

Zircons from Collisional Granites, Garhwal Himalaya, NW India: U–Th–Pb Age, Geochemistry and Protolith Constraints

et al. 2021

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“…The granite rocks are well exposed around Toneta village (Figure 3a; Negi, Sinha, & Pandey, 1980; Mishra et al, 2019). The U–Th–Pb age of these granites is 1,845 ± 19 Ma (Mishra et al, 2021).…”

Section: Field and Petrographic Characteristics Of The Studied Rocksmentioning

confidence: 99%

Palaeoproterozoic S‐type granites from Garhwal Himalaya, NW India: Geochemistry, Sm–Nd isotope systematics and tectonic implications

et al. 2022

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A combined geochemical and Sm-Nd isotopic study on the Palaeoproterozoic (1,845 Ma) granites of the Lesser Himalayan Crystalline Sequence (LHCS) in the Garhwal region of NW India has been done in the present study. These granite samples are characterized by high silica, alumina, and potash and belong to a peraluminous to strongly peraluminous series, having molar A/CNK values of 1.01 to 2.4. The low P 2 O 5 contents and its negative correlation with SiO 2 presiding out that the granites have S-type affinity, also supported by various classification diagrams (ACF; SiO 2 vs. P 2 O 5 , Na 2 O + K 2 O-CaO, and Th). The concentration of trace elements Ba, Sr, Nb, and Ti are low, and Rb, Th, U, and Pb are found to be high. The granites have low total rare earth elements contents of 56.19-229.16 ppm with enrichment in Light rare earth elements (LREE) ([La/Yb] N = 1.61-15.08) and negativeeuropium anomaly (Eu/Eu* = 0.12-0.31). Sm-Nd isotope studies were also performed for three granite samples. Estimated model ages as 2.5-2.7 Ga, indicates the contribution of the Archean crustal substrate as their protolith source. Therefore, we assume that the melting of metasedimentary rocks with Archean protolith can form these peraluminous granites in an accretional-collisional event, during the Palaeoproterozoic on the western flank of the Columbia supercontinent.

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“…And the granite in Toneta is of tourmaline variety which was at place chlorite rich also. (12,13) The villages in these areas constitute High-risk areas.…”

Section: Higher Himalayas-rock Sequence North To the Main Central Thrustmentioning

confidence: 99%

Geomedical Assessment of Areas Having Varying Groundwater Fluoride Levels in Rudraprayag District, Uttarakhand

Nidhi Sharma,

Vartika Saxena,

Manisha Naithani

et al. 2021

IJPHRD

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Background: Fluorosis is a public health problem caused by excess intake of fluoride through drinking water. Groundwater around the rocks composed of fluoride-rich compounds may have a high concentration of fluoride. Thus, analyzing the geology of the area may serve as a guide for easy surveillance of fluorosis disease. Methods: The geological maps of the district were analyzed to develop a fluoride risk map for the occurrence of fluorosis i.e., the district was divided into three geological categories; high risk, intermediate, and low-risk areas. This map was correlated to the groundwater fluoride levels and prevalence and severity of dental fluorosis in the population of the corresponding area. A cross-sectional study was conducted using a purposive cluster sampling method, a total of 12 villages were selected from the district. Dental fluorosis was recorded in 558 children and 36 groundwater samples of these villages. Results: Fluoride contamination was almost nil (< 0.6ppm) in the areas composed of quartz and limestone which also showed an absence of fluorosis in the dependent population. It was moderate (0.6-1.5ppm) in areas ofaugen gneiss, porphyritic gneiss with mica schist which showed around 59.9% prevalence of fluorosis. Whereas, heavy contamination of fluoride (> 1.5ppm) was seen where granite was the main soil-forming parent rock and around 93% of the related population was affected by fluorosis. Conclusions: This study confirms the positive association between the presence of fluoride-rich rocks around the water source and the prevalence of fluorosis in the population of the area. Based on the finding of this study, geological maps of each district of the state may help in indicating the higher chances of occurrence of fluorosis in the respective districts.

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Geochemistry and geodynamic setting of Paleoproterozoic granites of Lesser Garhwal Himalaya, India

Cited by 4 publications

References 12 publications

Zircons from Collisional Granites, Garhwal Himalaya, NW India: U–Th–Pb Age, Geochemistry and Protolith Constraints

Zircons from Collisional Granites, Garhwal Himalaya, NW India: U–Th–Pb Age, Geochemistry and Protolith Constraints

Palaeoproterozoic S‐type granites from Garhwal Himalaya, NW India: Geochemistry, Sm–Nd isotope systematics and tectonic implications

Geomedical Assessment of Areas Having Varying Groundwater Fluoride Levels in Rudraprayag District, Uttarakhand

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