<p>I recently heard that the d98Mo isotope is not different from the d238U isotope in redox processes e.g. in black shale events. But I can't find any evidence except the figure from Zhang et al. unfortunately,
2018:</p>
<p><a href="https://i.sstatic.net/GeaLD.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/GeaLD.png" alt="enter image description here" /></a></p>
<p>But I know that the correlation is not really recognisable and the explanation is missing:D Can you give me literature or have an explanation at hand?</p>

CC BY-SA 4.0
2023-07-24T19:20:30.310Z
You might be interested in this: [*Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period*](https://www.uwspace.uwaterloo.ca/handle/10012/13781).
Fred
CC BY-SA 4.0
2023-07-24T19:23:45.560Z
There is also: [*An expanded shale d98Mo record permits recurrent shallow marine oxygenation during the Neoarchean*](https://uwaterloo.ca/scholar/bkendall/publications/expanded-shale-d98mo-record-permits-recurrent-shallow-marine-oxygenation) and [*Anomalous molybdenum isotope trends in Upper Pennsylvanian euxinic facies: Significance for use of d98Mo as a global marine redox proxy*](https://asu.elsevierpure.com/en/publications/anomalous-molybdenum-isotope-trends-in-upper-pennsylvanian-euxini-2).
Fred
CC BY-SA 4.0
2023-07-24T19:29:32.070Z
This has a little more information than the previous link [*Anomalous molybdenum isotope trends in Upper Pennsylvanian euxinic facies: Significance for use of δ98Mo as a global marine redox proxy*](https://www.sciencedirect.com/science/article/abs/pii/S000925411200232X).
Fred
CC BY-SA 4.0
2023-07-24T19:32:44.750Z
Out of interest, what does the d or δ in front of the isotope mean, as δ98Mo or d98Mo?
Fred
CC BY-SA 4.0
2023-07-25T15:22:38.830Z
I mean your Delta, i dont know how to tipe it:)
Weiss
CC BY-SA 4.0
2023-07-25T19:28:53.900Z
I just copied δ from the operating system character map & inserted it here.
Fred
<geochemistry><isotopic>
Co variance of isotopes in geochemical amplications
Weiss
# Co variance of isotopes in geochemical amplications

(Asked by: username_0 on 2023-06-18)

I recently heard that the d98Mo isotope is not different from the d238U isotope in redox processes e.g. in black shale events. But I can't find any evidence except the figure from Zhang et al. unfortunately,
2018:

[![enter image description here](https://i.sstatic.net/GeaLD.png)](https://i.sstatic.net/GeaLD.png)

But I know that the correlation is not really recognisable and the explanation is missing:D Can you give me literature or have an explanation at hand?

**Tags:** geochemistry, isotopic

> **Comments:**
> **username_1**: You might be interested in this: [*Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period*](https://www.uwspace.uwaterloo.ca/handle/10012/13781).  
> **username_1**: There is also: [*An expanded shale d98Mo record permits recurrent shallow marine oxygenation during the Neoarchean*](https://uwaterloo.ca/scholar/bkendall/publications/expanded-shale-d98mo-record-permits-recurrent-shallow-marine-oxygenation) and [*Anomalous molybdenum isotope trends in Upper Pennsylvanian euxinic facies: Significance for use of d98Mo as a global marine redox proxy*](https://asu.elsevierpure.com/en/publications/anomalous-molybdenum-isotope-trends-in-upper-pennsylvanian-euxini-2).  
> **username_1**: This has a little more information than the previous link [*Anomalous molybdenum isotope trends in Upper Pennsylvanian euxinic facies: Significance for use of δ98Mo as a global marine redox proxy*](https://www.sciencedirect.com/science/article/abs/pii/S000925411200232X).  
> **username_1**: Out of interest, what does the d or δ in front of the isotope mean, as δ98Mo or d98Mo?  
> **username_0**: I mean your Delta, i dont know how to tipe it:)  
> **username_1**: I just copied δ from the operating system character map & inserted it here.  

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## 0 answers

