نتایج جستجو برای: geochemical potential mapping

تعداد نتایج: 1258017  

2015
SIWAN M DAVIES

From its Icelandic origins in the study of visible tephra horizons, tephrochronology took a remarkable step in the late 1980 s with the discovery of a ca. 4300-year-old microscopic ash layer in a Scottish peat bog. Since then, the search for these cryptotephra deposits in distal areas has gone from strength to strength. Indeed, a recent discovery demonstrates how a few fine-grained glass shards...

2007
W. W. SHILTS

Drift compositional studies were initiated at the Geological Survey of Canada (GSC) in the mid-1960's in projects that drew heavily on the technology and approaches developed in Fennoscandia over the previous century. As this research progressed and expanded in the 1970's, its Fennoscandian character diminished and, like the geochemical exploration research program that it closely paralleled, d...

2013
Lauren P. Birgenheier Tracy D. Frank Christopher R. Fielding Michael C. Rygel

Proxy geochemical records from high-latitude, ice-proximal deposits have the potential to provide key insights into past icehouse climates, but such records are rare. The Permian System of eastern Australia contains a rich record of environmental and climatic changes that occurred in areas proximal to glaciation during the acme and waning stages of the late Paleozoic ice age. Within this succes...

2016
Chloé E. A. Amberg Tim Collart Wout Salenbien Lisa M. Egger Axel Munnecke Arne T. Nielsen Claude Monnet Øyvind Hammer Thijs R. A. Vandenbroucke

Ordovician limestone-marl alternations in the Oslo-Asker District have been interpreted as signaling glacio-eustatic lowstands, which would support a prolonged "Early Palaeozoic Icehouse". However, these rhythmites could alternatively reflect differential diagenesis, without sedimentary trigger. Here, we test both hypotheses through one Darriwilian and three Katian sections. Our methodology con...

2000
G. F. Bonham-Carter F. P. Agterberg

A variety of regional geoscience datasets from Nova Scotia have been co-registered and analyzed using a geographic information system (GIS). The datasets include bedrock and surficial geological maps, airborne geophysical survey data, geochemistry of lake-sediment samples, and mineral occurrence data. A number of line features, including structural lineaments, fold axes and formation contacts, ...

In this study, it is attempted to analyze sensitivity and reliability in order to evaluate the liquefaction potential in soil layers in Tabriz. 62 boreholes that had possible conditions for liquefaction were selected. Seismic mapping was simulated using finite fault method and then the effect of soil layers on PGA was estimated. In continue, the liquefaction potential index was estimated and th...

Journal: :Nature Reviews Earth & Environment 2021

Geochemical data are vital for understanding Earth’s past, present and future. However, currently only a fraction of geochemical findable, accessible, interoperable reusable, limiting their use in the broadest range scientific studies. There is an urgent need international coordination methods to unlock full research potential.

2013
Avner Vengosh Nathaniel Warner Rob Jackson Tom Darrah

Advances in drilling technologies and production strategies such as horizontal drilling and hydraulic fracturing have significantly improved the production of natural gas by stimulating fluid flow from wells. Since 2008, these technological developments have spurred exponential growth of gas well drilling across the U.S. While the new drilling for shale gas and hydraulic fracturing technologies...

Journal: :Brazilian Journal of Geology 2022

We present this manuscript as a methodological approach and general guidelines for geochemical mapping background/baseline projects environmental assessment in tropical areas. A case study was carried out the Itacaiúnas River watershed (IRW), Eastern Amazon, to fill gap knowledge on distribution of chemical elements, particularly those potentially toxic, near-surface environment area. The high-...

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