scholarly journals A multidisciplinary Earth science research program in China

Eos ◽  
2011 ◽  
Vol 92 (38) ◽  
pp. 313-314 ◽  
Author(s):  
Shuwen Dong ◽  
Tingdong Li ◽  
Rui Gao ◽  
Hesheng Hou ◽  
Yingkang Li ◽  
...  
Keyword(s):  
Research Program ◽  
Earth Science ◽  
Science Research

Russian Earth Science Research Program on ISS

1999 ◽  
Author(s):  
N. A. Armand ◽  
Yu. G. Tishchenko
Keyword(s):  
Research Program ◽  
Earth Science ◽  
Science Research

scholarly journals Stalagmite Layers Reveal Hidden Climate Stories

Eos ◽  
2021 ◽  
Vol 102 ◽  
Author(s):  
Andy Baker ◽  
Gregoire Mariethoz ◽  
Laia Comas-Bru ◽  
Andreas Hartmann ◽  
Silvia Frisia ◽  
...  
Keyword(s):  
Earth Science ◽  
Science Research ◽  
Growth Properties

A global investigation discovers where annually laminated stalagmites are found, analyzes their growth properties, and explains how they can be best used in Earth science research.

scholarly journals The R package “eseis” – a software toolbox for environmental seismology

2018 ◽  
Vol 6 (3) ◽  
pp. 669-686 ◽  
Author(s):  
Michael Dietze
Keyword(s):  
Data Science ◽  
Earth Science ◽  
Science Research ◽  
Worked Examples ◽  
R Package ◽  
Research Field ◽  
Data Sets ◽  
Research Fields ◽  
Scientific Disciplines ◽  
Analysis Environment

Abstract. Environmental seismology is the study of the seismic signals emitted by Earth surface processes. This emerging research field is at the intersection of seismology, geomorphology, hydrology, meteorology, and further Earth science disciplines. It amalgamates a wide variety of methods from across these disciplines and ultimately fuses them in a common analysis environment. This overarching scope of environmental seismology requires a coherent yet integrative software which is accepted by many of the involved scientific disciplines. The statistic software R has gained paramount importance in the majority of data science research fields. R has well-justified advances over other mostly commercial software, which makes it the ideal language to base a comprehensive analysis toolbox on. The article introduces the avenues and needs of environmental seismology, and how these are met by the R package eseis. The conceptual structure, example data sets, and available functions are demonstrated. Worked examples illustrate possible applications of the package and in-depth descriptions of the flexible use of the functions. The package has a registered DOI, is available under the GPL licence on the Comprehensive R Archive Network (CRAN), and is maintained on GitHub.

Experimental fluid-mediated alteration of zircon under lower greenschist facies conditions

2020 ◽  
Vol 58 (2) ◽  
pp. 247-265
Author(s):  
Colter J. Kelly ◽  
Daniel E. Harlov ◽  
David A. Schneider ◽  
Simon E. Jackson ◽  
Renelle Dubosq
Keyword(s):  
Ion Exchange ◽  
Inductively Coupled Plasma ◽  
Earth Science ◽  
Science Research ◽  
Aqueous Fluid ◽  
Mapping Technique ◽  
Geological Time ◽  
Geological Time Scale ◽  
Chemically Modified ◽  
Geological Processes

ABSTRACT The use of zircon in the dating of geological processes and tectonic events has become a standard approach in many aspects of Earth science research. As a result, understanding how zircon interacts with aqueous fluids during metasomatism has become increasingly important. The alteration of natural zircon is driven primarily by coupled dissolution–reprecipitation or by ion-exchange with an aqueous fluid. In this study, whole and intact, euhedral light-brown zircon crystals (100–250 μm in length; 2 mg) from the Oligocene Fish Canyon Tuff (FCT) were experimentally reacted with an alkali-bearing reactive fluid and a REE + P source (0.5 mg CePO4 or 0.5 mg YPO4). Experiments were conducted in sealed Au metal capsules at 350 °C and 100 MPa for 182 days. During the experiment, the zircon became colorless, indicating annealing of the radiation damage in the crystal. Two-dimensional element maps of the outermost 3 μm of unpolished zircon crystal surfaces were produced using a grind of contiguous 7 μm analytical spots via laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The chemical maps indicate that the surface of the zircon crystals from each experiment heterogeneously reacted with the fluid, such that the Ce and Y concentration of chemically modified areas increased (by an order of magnitude) in the CePO4-bearing and YPO4-bearing experiments, respectively, when compared with the chemical maps of unaltered zircon grain surfaces. Helium ion microscopy of polished crystals revealed discontinuous micron-scale altered domains at the crystal margin, consistent with the findings of the unpolished mapping technique. Interestingly, the Th and U concentration of the altered zircon grain surfaces were consistent with the unaltered zircon regardless of the experiment. Incorporation of REEs on the zircon grain surface likely occurred via the coupled substitution REE3+ + P5+ ↔ Zr4+ + Si4+. The results from these experiments imply that the surfaces of minimally metamict zircon can be chemically modified by alkali-bearing fluids via ion exchange under lower greenschist pressures and temperatures over relatively short time periods with respect to the geological time scale.

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