Himadri Basu

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Questions related from Himadri Basu

Analysis of a carbonate (calcite) vein sample yielded d18O of 6.09 (V-SMOW) and d13C of -4.23 (V-PDB), and only 47 ppm Sr. Can it be carbonatite?

Analysis of a carbonate (calcite vein) sample yielded d18O of 6.09 (V-SMOW) and d13C of -4.23 (V-PDB), and only 47 ppm Sr. Stable isotopic data indicate 'mantle signature', while Sr abundance is...

06 October 2021 2,088 6 View

Why is CO2 liberated during metamorphic decarbonation isotopically enriched relative to carbonates?

CO2 is normally isotopically depleted compared to carbonate rocks (e.g. limestone). However, CO2 liberated during decarbonation of carbonate rocks are enriched in both O18 and C13. Why?

08 June 2021 1,965 4 View

How to convincingly establish the hydrothermal origin of pyrite occurring in uranium mineralized limestone?

Pyrites are known to form in low-temperature sedimentary to high-temperature magmatic environments. They also form from extensively wide variety of ore-bearing fluids. S isotope data often helps...

12 May 2021 6,185 4 View

What is the source of detrital feldspar in the Badami Sediments?

The Badami sediments exposed NNE and NE of Belgaum comprise granular to fine-pebble conglomerate and fine- to medium-grained sandstone. Both the sandstone and conglomerate contain abundant angular...

04 March 2017 8,957 10 View

Cherts from which Proterozoic basins will be studied?

Globally there are a number of Proterozoic basins containing chert beds. The Palaeoproterozoic Vempalle Formation (Cuddapah Basin, Eastern Dharwar Craton) contains...

27 November 2016 8,879 2 View

Which REE normalization procedure shall I follow for geochemical study of shale? PAAS or Chondrite? Why?

For normalizing REE data of fine siliciclastic rocks both PAAS as well as Chondrite values are used. Ideally both would given similar normalized REE pattern. Please suggest me which normalization...

02 July 2016 7,737 11 View

Can I use shale geochemistry to infer palaeoclimate?

Sandstone geochemistry is often used to infer palaeoclimate e.g. Al2O3+K2O+Na2O vs. SiO2 plot of Suttner et al., 1986. Is there any similar study on shale?

30 January 2014 9,665 5 View

What is floating texture? How does it originate? Can anybody suggest to me some good references?

In a ferruginous sandstone sample I found very well rounded quartz grains are floating in ferruginous matrix and cement. I suspect it to be floating texture. I want more detailed information on it.

22 November 2013 6,573 3 View