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Saini, N. K.
- A New Metabasic Reference Sample (MB-H) from Himalayan Orogenic Belt
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1 Wadia Institute of Himalayan Geology, 33-General Mahadeo Singh Road, Dehra Dun-248001, IN
1 Wadia Institute of Himalayan Geology, 33-General Mahadeo Singh Road, Dehra Dun-248001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 5 (1991), Pagination: 453-456Abstract
An attempt has been made to produce an international metabasic rock standard from the Rudraprayag Fonnation of Himalayan orogenic belt. The bulk sample collected has been processed and subjected to homogeneity test (F test). The salient petrographic features. proximate analysls and the F-ratio of the different fractions are presented in this paper.- Working Values for Major, Minor and Trace Elements for Meta-Basic Reference Sample (MB-H)
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Authors
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1 Wadia Institute of Himalayan Geology, 33-General Mahadeo Singh Road, Dehra Dun, IN
1 Wadia Institute of Himalayan Geology, 33-General Mahadeo Singh Road, Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 43, No 3 (1994), Pagination: 295-303Abstract
Proposal for the preparation of a metabasic reference sample (MB-H) from the Himalayas has attracted the participation of twenty four laboratories of repute from thirteen countries beside India. Tables of compiled data (1818 total individual results in all) are presented in this paper. Working values/information values have been assigned for 37 major, minor and trace elements including REEs after rigorous statistical as well as subjective data evaluation.Keywords
Trace Elements, Statistics, Geochemistry, Geostandard.- Evaluation of REE Determination in Geological Samples by Inductively Coupled Plasma Emission Spectrometry
Abstract Views :178 |
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Authors
Affiliations
1 Wadia institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehra Dun - 248 001, IN
1 Wadia institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehra Dun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 3 (1996), Pagination: 325-330Abstract
Rare earth elements were separated from ten intemational geological reference samples by the classical ion-exchange chromatographic technique. Concentrations of ten rare earth elements were measured by inductively coupled plasma emission spectrometry. Comparison with the conensus values show a fairly good accuracy (<10%) for all the elements except for Lu. REE data for MB-H a metabasic reference sample and G-2, a granite reference sample have been compiled to determine the long term precision. A RSD value of 5-8% for La, Ce, Nd, Sm, Eu, Gd, Dy, Er and Yb indicates good reproducibility of our values. RSD for Lu was found to be high and it reaches up to 22% in G-2. The high RSD and poor accuracy for Lu in some samples is mainly attributed to low abundance level of this element which is very close to its detection limit. Ce, Gd and Sm are preferred to be analysed against a separated REE fraction of a rock standard having similar matrix to avoid the interferences. However, rest of the REEs can be comfortably measured against a salt standard.Keywords
Analytical Geochemistry, Rare Earth Elements, ICP-AES.- A Proposed Amphibolite Reference Rock Sample (AM-H) from Himachal Pradesh
Abstract Views :198 |
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1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 799-802Abstract
An amphibolite sample named as AM-H is the third candidate reference rock in the series of reference samples from Himalaya. First two geostandards already characterized in the series being MB-H (metabasic) and DG-H (granite), are now in use for routine analysis at several laboratories. The sample is being distributed to several participating laboratories and analysts for contribution of analytical data. The sample was tested for its suitability as a reference standard in terms of its bulk homogeneity using F-test carried out for 16 fractions of the sample analyzed in duplicate. The results of homogeneity test along with relevant information like, location, geological set-up, mineralogical makeup, petrography and expected chemical composition are given for the benefit of potential analyst/contributors. The proposed reference sample may prove useful for analysis of metabasics and intermediate igneous rocks with high Cr and lower abundances of elements like Ba, Na, K, P, Nb and Zr.Keywords
Geochemistry, AM-H, Geostandard, Amphibolite, F-test, Himalaya.- Geochemical Dispersion Pattern of some Heavy Metals in Upper Alaknanda Catchment: Application in Mineral Exploration and Environmental Implications
Abstract Views :199 |
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Authors
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1 Wadia Institute of Himalayan Geology, 33, Gen. Mahadeo Singh Road, Dehra Dun, 248 001, IN
1 Wadia Institute of Himalayan Geology, 33, Gen. Mahadeo Singh Road, Dehra Dun, 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 1 (2007), Pagination: 97-108Abstract
Geochemical characteristics of active stream and river sediment from part of the main Alaknanda catchment including main tributaries (Nandakini, Pindar and Mandakini) in Garhwal Himalaya were investigated. Economically important and environmentally sensitive selected trace element (Cr, Ni, Pb, Zn, Cu, Th and U) abundance in the sediments were studied to evaluate their spatial distribution in relation to lithotectonic control, mineral prospects and environmental geochemistry. The background concentrations, as median values, are found perceptibly enriched for these elements with respect to upper crustal average. Distribution patterns of U, Th and Pb are distinctive and show intrinsic relationship with the medium-grade deformed rocks (granitoids) of central crystallines and are generally enriched, whereas Cu is depleted in the same area. Background concentration of Cr is many fold enriched as compared to crustal abundance. 5 However, Ni in relation to Cr is not so high. There is a good correlation between Cr and Ni in the areas of mafic volcanic occurrences within low-grade metasedimentry rocks. But the same is not true in case of Nandakini valley within Baijnath central crystallines where Cr enrichment is anomalously high with Ni showing antagonistic relationship. High U and Th content in sediments are observed within or near the central crystalline thrust sheets, whereas the Cu and Zn anomaly zones are restricted within the Garhwal group of rocks. Some of these anomalies are significant and seems to have a definite structural (thrust/Fault) and lithological control, such as crystallines for U and Th and carbonates for Cu and Zn. The present study, thus also provides some useful clues for mineral exploration. Whereas the high anomaly areas are highly potential for economic mineral deposits of Cu, Zn, U and Th, but at the same time are equally prone to toxic exposure of U and Th as well as risk of arsenic and cadmium contamination that are normally associated with Cu and Zn sulphides.Keywords
Trace element geochemistry, Heavy Metals, Stream Sediments, Background value, Mineralization, Environmental impact, Himalaya.- A New Geochemical Reference Sample of Granite (DG-H) from Dalhousie, Himachal Himalaya
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN