[1]) with terrestrial standard samples used in this study (red). JA-1 is the most K-rich.. VENUS GEOCHEMICAL ANALYSIS BY REMOTE LASER-INDUCED BREAKDOWN SPECTROSCOPY (LIBS). S. M. Clegg, J. E. Barefield, R. C. Wiens, S. K. Sharma, A. K. Misra, J. Tucker, M. D. Dyar, J. Lambert, S. Smrekar, A. Treiman. Los Alamos National Laboratory, P.O. Box 1663 MS J565, Los Alamos, NM 87545, [email protected], j...

Recharge events that deliver electron acceptors such as O2, NO3, SO4, and Fe3+ to anaerobic, contaminated aquifers are likely important for natural attenuation processes. However, the specific influence of recharge on (bio)geochemical processes in ground water systems is not well understood. The impact of a moderate-sized recharge event on ground water chemistry was evaluated at a shallow, sand...

Introduction: Since January 2004, the twin rovers Spirit and Opportunity of the Mars Exploration Rover (MER) mission have been able to investigate their respective landing sites thanks to the Athena Science Payload [1]. This scientific payload includes the Alpha Particle X-ray Spectrometer (APXS) instrument [2], whose role is to determine the elemental composition of martian soils and rocks. Du...

Until recently, measurement of trace elements with ppm concentrations has been inaccessible to STEM EDS. Development of fast SDD detectors with solid angles > 1/2 steradian and faster processors are now making such measurements a reality. STEM EDS measurements already have a low brehmsstrahlung background owing to thin samples. However, the combination of high beam currents required to attain s...

A comparison is made of the probability of the process of two neutrino double beta decay for Se in direct (counter) and geochemical experiments. It is shown that the probability is systematically lower in geochemical experiments, which characterize the probability of ββ(2ν) decay a few billions years ago. The experimental data for Te are also analyzed. It is shown that geochemical measurements ...

Historical sediment nutrient concentrations and heavy-metal distributions were studied in fi ve embayments in the Gulf of Finland and an adjacent lake. Th e main objective of the study was to examine the response of these water bodies to temporal changes in human activities. Sediment cores were collected from the sites and dated using 210Pb and 137Cs. Th e cores were analyzed for total carbon (...

The geochemical history of an upper deltaic plain pending tidal wetland restoration was reconstructed to assess remobilization of redox-sensitive constituents in sediment, identify depositional processes promoting geochemical retention, and determine the extent of contamination with Hg, As, Pb, Cu, and Zn. Three 12-14-m sediment cores were analyzed for bulk sediment geochemistry using ICP-AES. ...

Analysis of the distribution of major components and heavy metals in a section of post-Jurassic deposits of southern Hess Rise (Deep Sea Drilling Project Site 465), the results of processing analytical data by factor analysis, interpretation of information on mineralogy and lithology of sediments, and evaluation of rates of component accumulation enable distinction of the main stages in the geo...

This report presents some strategies to predict metal mobility at mining sites. These strategies are based on chemical, physical, and geochemical information about metals and their interactions with the environment. An overview of conceptual models, metal sources, and relative mobility of metals under different geochemical conditions is presented, followed by a discussion of some important phys...

Editorial Geochemical Transactions, the first online-only journal in geochemistry and environmental chemistry, is now the first major open access journal in this subject area. All issues of Geochemical Transactions, including the back content, will be fully and permanently available online to all, without a subscription charge. Copyright of all future articles will be retained by the authors. G...