Dripwater organic matter and trace element geochemistry in a semi-arid karst environment: Implications for speleothem paleoclimatology

Controls on trace element Sr–Mg compositions of carbonate cave waters: implications for speleothem climatic records

Ž . At two caves Clamouse, S France and Ernesto, NE Italy , cave drip and pool waters were collected and sampled at intervals over a 2–3 year period. MgrCa and SrrCa concentration ratios, corrected for marine aerosols, are compared with those of bedrocks and, in some cases, aqueous leachates of soils and weathered bedrocks. Cave waters do not lie along mixing lines between calcite and dolomite ...

Geochemistry and dynamics of calcrete genesis in semi-arid regions

Calcretes are the calcite crusts widely developed at the Earth's surface in semi-arid regions (e.g., Goudie, 1983; Nahon, 1991; Wright and Tucker, 1991 ). Thickness of calcretes is tens of centimeters to a few meters, and increases downslope. Calcretes pseudomorphically replace all underlying silicate rocks. Parent rock structure and bulk volume are preserved. In the lower part of calcrete prof...

Trace Element Geochemistry of Iowa Coal

A land covers classification system for environment assessment in semi-arid regions of Iran

Land degradation is a major danger which restricting different areas of Iran. Systematic description of the environmentfor detection of environmental changes and the human-related causes and responses is essential in land cover changestudy. Use of land cover data allow detection of where certain changes occur, what type of change, as well as how theland is changing. Existing systems for classif...

Mg, Sr and Sr isotope geochemistry of a Belgian Holocene speleothem: implications for paleoclimate reconstructions

87 86 Ž In this study, variations in MgrCa, SrrCa and Srr Sr ratios in a Holocene Belgian speleothem cave secondary . carbonate deposit are interpreted in terms of changes in water residence time and changes in weathering processes, possibly Ž . induced by changes in West European climate. A stalagmite from the Pere Noel cave Belgium was dated with the TIMS ` ̈ UrTh method and was deposited bet...