In Situ-Produced Cosmogenic Nuclides and Quantification of Geological Processes

2006 ◽  
Author(s):  
Ana María Alonso-Zarza ◽  
Lawrence H. Tanner
Keyword(s):  
Cosmogenic Nuclides ◽  
Geological Processes

scholarly journals A Photometric Study of Regolith Intimate Mixing with Ice-Like Impurity

2021 ◽  
Author(s):  
Dwaipayan Deb ◽  
Pavan Chakraborty
Keyword(s):  
Solar System ◽  
Linear Trend ◽  
Geological Processes ◽  
Solar System Objects ◽  
Shadowing Effect ◽  
Mixing Proportion ◽  
In Situ Observations ◽  
End Members ◽  
Reflectance Data

Abstract Surfaces of solid solar system objects are covered by layers of particulate materials called regolith originated from their surface bedrock. They preserve important information about surface geological processes. Often regolith is composed of more than one type of particle in terms of composition, maturity, size, etc. Experiments and theoretical works are being carried out to constrain the result of mixing and extract the abundance of compositional end-members from regolith spectra. In this work we have studied, photometric light scattering from simulated surfaces made of two different materials – one is highly bright quartz particles ≈ 80µm and the other moderately bright sandstone particles ≈ 250µm. The samples were mixed with varying proportions and investigated at normal illumination conditions to avoid the shadowing effect. Said combinations may resemble ice mixed regolith on various solar system objects and therefore important for in situ observations. We find that the combinations show a linear trend in the corresponding reflectance data in terms of their mixing proportion and some interesting facts come out when compared to previous studies.

Biogeochemistry and Climate

2019 ◽  
pp. 29-43
Author(s):  
Han Dolman
Keyword(s):  
Ice Cores ◽  
Atmospheric Composition ◽  
System Modelling ◽  
Biogeochemical Processes ◽  
Sources And Sinks ◽  
Direct Observations ◽  
Geological Processes ◽  
In Situ Observations ◽  
Insight Into

This chapter focuses on tools for climate research: biogeochemical observations and models. It discusses physical climate observations, such as temperature and humidity, and in situ observations of atmospheric composition. Turning these into reliable climate records appears to be non-trivial. The chapter describes how isotopes are used to get insight into biogeochemical processes. A special category of observations is biogeochemical proxy observations, used to gain insight into geological processes when no direct observations are possible. The example of climate proxy observations, such as those obtained via ice cores, is described. Models are increasingly used to gain insight into sensitivity of climate to changes in the forcing. Earth system modelling has become increasingly complex over the last two decades, including often detailed biogeochemical processes in the ocean and on land. The parametrization of these remains an important research subject. Inverse modelling is being used to identify sources and sinks of greenhouse gases.

Surface exposure dating by in-situ produced cosmogenic nuclides: chemical mineral separation of purified quartz

2001 ◽  
Vol 89 (11-12) ◽  
Author(s):  
M. Altmaier ◽  
W. Klas ◽  
U. Herpers
Keyword(s):  
Cosmic Radiation ◽  
Cosmogenic Nuclides ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Mineral Separation

The interaction of cosmic radiation with terrestrial matter leads to the

Initial incision of the Jinshan Gorge of the Yellow River, China, constrained by terrestrial in situ cosmogenic nuclides chronology

2020 ◽  
Vol 550 ◽  
pp. 111-119 ◽  
Author(s):  
Zhongyun Li ◽  
Ke Zhang ◽  
Hao Liang ◽  
Zhen Chen ◽  
Xiaoyang Li ◽  
...  
Keyword(s):  
Yellow River ◽  
Cosmogenic Nuclides ◽  
The Yellow River
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