Results 41 to 50 of about 4,709 (174)

Active geothermal systems with entrained seawater as analogues for low-sulphidation epithermal mineralization [PDF]

, 2005
The paradigm for low-sulphidation (LS) volcanic-arc associated mineralization is the active geothermal systems located along the Taupo Volcanic Zone (e.g. Broadlands). However, this analogue is inapt where fluid salinities are consistently in excess of 3.
Darbyshire, Fiona, Kilias, Stephanos P, Naden, Jonathan   +2 more
core   +1 more source

Does Palsa Thaw in Northern Finland Contribute to Remobilisation of Metals Accumulated in Peat Into Surface Waters?

Land Degradation &Development, EarlyView.
ABSTRACT Permafrost is rapidly degrading in the sporadic zone, including palsa mires in Scandinavia. Peatlands in the area have likely accumulated heavy metals from atmospheric deposition of industrial contaminants in the wider region. As the palsa mire chemical composition is not well known, and in other permafrost regions the permafrost thaw may ...
Joanna Katarzyna Jóźwik, Krystyna Kozioł, Marcin Frankowski, Marta Jakubiak, Kamil Nowiński, Mariusz Jędrysek, Danuta Szumińska, Żaneta Polkowska   +7 more
wiley   +1 more source

The patterns and implications of diurnal variations in the d-excess of plant water, shallow soil water and air moisture [PDF]

, 2014
Deuterium excess (d-excess) of air moisture is traditionally considered a conservative tracer of oceanic evaporation conditions. Recent studies challenge this view and emphasize the importance of vegetation activity in controlling the dynamics of air ...
Liu, X., Ruan, Y., Wang, Lixin, Xiao, H., Zhao, L., Zhou, M.   +5 more
core   +2 more sources

Cryostratigraphy of Rhythmic Segregated Ice in Colluvium and Implications for Permafrost Slope Stability

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The amount and stratigraphic setting of ground ice in permafrost slopes is a key control on the style and magnitude of permafrost mass wasting. Understanding the spatial and stratigraphic variations in ground ice distribution on permafrost slopes is therefore a fundamental property in assessing the stability of permafrost hillslopes.
Joseph M. Young, Alejandro Alvarez, Duane Froese   +2 more
wiley   +1 more source

O, H and C isotopic systematics of Icelandic groundwater [PDF]

E3S Web of Conferences, 2019
Stable water isotopes of oxygen and hydrogen have been studied in Icelandic natural waters since 1960 for hydrological and geothermal research. All the waters are of meteoric and seawater origin.
Sveinbjörnsdóttir Arny E., Stefánsson Andri, Heinemeier Jan   +2 more
doaj   +1 more source

Late Holocene moisture variability in Arctic Alaska from chitin δ18O

Boreas, EarlyView.
Amplified warming in the Arctic has resulted in reduced sea‐ice extent, which can impact regional climate dynamics. Elucidating past moisture variability in response to changing temperatures and sea‐ice conditions can offer insight into how anthropogenic climate change may impact Arctic areas such as the Alaskan North Slope in the future. We contribute
Briana A. Edgerton, Melissa L. Chipman
wiley   +1 more source

Stable Isotope clues to the formation and evolution of refrozen melt ponds on Arctic Sea ice. [PDF]

, 2018
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 123(12), (
Ackley, Stephen, Gao, Yongli, Maksym, Ted, Stammerjohn, Sharon E., Tian, Lijun, Weissling, Blake   +5 more
core   +1 more source

Droughts and human impact in the ancient Uaymil region of the Maya lowlands inferred from a 2800‐year sedimentary archive at Lake Kaná, Mexico

Boreas, EarlyView.
The relationship between the climate and societal transformation in Maya lowlands has long been debated, particularly the role of drought in shaping the civilization trajectory during the Classic Period. A high‐resolution, multi‐proxy, geochemical record from Lake Kaná, located in the underexplored Uaymil region of the Yucatán Peninsula in Mexico ...
Haydar B. Martinez‐Dyrzo, Priyadarsi D. Roy, Benjamin Gwinneth, Irma G. Vargas‐Martinez, Alejandro A. Aragon‐Moreno, Roger Medina‐Gonzales   +5 more
wiley   +1 more source

Geochemical characteristics of spring water in Baishuitai of Yunnan and their indicative significance on climatic environment

Carsologica Sinica
Understanding the geochemical characteristics and dynamic changes of groundwater (e.g., springs, etc.) is an important scientific reference for accurately interpreting the paleoclimatic and environmental information on karst deposits (e.g., stalagmites ...
Xi ZHAO, Hongyang XU, Hailing GAN, Aihua YE, Limin ZHOU, Xiangmin ZHENG   +5 more
doaj   +1 more source

Origin and residence time of groundwater based on stable and radioactive isotopes in the Heihe River Basin, northwestern China

Journal of Hydrology: Regional Studies, 2018
Study region: The Heihe River Basin (HRB) is one of several arid basins in which runoff from the Qilian Mountain recharges basin aquifers. Study focus: A basin-wide dataset (δ18O, D, 3H and 14C) is used to determine the present and past relationships ...
L.J. Zhao, C.J. Eastoe, X.H. Liu, L.X. Wang, N.L. Wang, C. Xie, Y.X. Song   +6 more
doaj   +1 more source