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(2020) Temporal Variation in Major Ion Concentrations and 87Sr/86Sr of Headwaters of the Godavari River Draining Basalt, India

Hishamunda V & Ramananda C


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14g: Plenary Hall, View in program

Valens Hishamunda View abstracts at 3 conferences in series
Chakrabarti Ramananda

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Submitted by Daniel Ibarra on
Nice dataset! Do you have discharge measurements? I'm curious about what the Sr concentration-discharge relationships look like? Do they somewhat follow Ca or Na? Could you further explain the vertical data in figure 7 87/86Sr versus 1/Sr, the bedrock and leach data. I'm not sure I understand what you are plotting here since they are not solute concentrations.
Dear Daniel .Thank you for your questions. Unfortunately ,I don't have discharge measurements for that particular location.There is no station there, the nearest station is about 100 km downstream of that location and the discharge data from data location may not be relevant to my study location. The relationship between discharge and Sr concentrations, according to my knowledge ,it should be negatively correlated. When discharge in drainage basin increases , the solute concentrations like Sr are expected to decrease due to dilution effect of rainwater. But this general statement can change depend on the lithology of a particular basin, for example when in a particular basin ,if there are exposed carbonates and silicate rocks, during monsoon , it is expected that more carbonates will weather easily than silicate, in that case dilution effect of rainwater can be minimized by effect of fast dissolution of carbonates, then in that case there will be positive correlation between Sr and discharge. In the case of my study area ,there is no exposed carbonate reported, except few carbonate nodules found in river bed. If I would have discharge data of that particular location, Ca, Na and discharges should follow the same relationship as the one between Sr and discharge since Ca ,Na and Sr are both mobile fluid during weathering. In fig 4. it shows correlation between 87sr/86Sr and 1/Sr. This figures show different end-members which control the river chemistry of my study location. first there are basalt (pink colors) which are more radiogenic and contribution from bulk carbonate nodules (but their contribution is less that 0.1 wt%) according to figure 5. However, all these components are not able to explain all variabilities in river water. That is why another component with more radiogenic 87Sr/86Sr with low Sr is required.That is what we are still investigating in this study. Except bedrocks, leached carbonates and bulk carbonates, others are solute concentrations.Different colours of nashik water are related to different seasons, PM=post-monsoon, M=monsoon, pre-M=pre-monsoon and winter. Thank you very much

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