Results 11 to 20 of about 7,307 (154)

K isotopes as a tracer of seafloor hydrothermal alteration [PDF]

Proceedings of the National Academy of Sciences of the United States of America, 2017
Significance Elemental exchange between seawater and oceanic crust is important both in modulating the ionic composition of seawater over geologic time and in controlling the elemental and isotopic makeup of various solid-earth reservoirs.
Stein Jacobsen
exaly   +5 more sources

Eu isotope fractionation and hydrothermal alteration [PDF]

Scientific Reports
Europium (Eu) has two naturally stable isotopes (151Eu and 153Eu). The Eu anomalies produced by feldspar crystallization during magma differentiation have provided valuable geochemical information for understanding the evolutionary history of magma in ...
Seung-Gu Lee, ShuangShuang Chen, Tae Jong Lee, Hyeoncheol Kim, Seung Ryeol Lee, Sung Hi Choi, Ung San Ahn, Youn Soo Lee   +7 more
doaj   +5 more sources

ASTER and GF-5 Satellite Data for Mapping Hydrothermal Alteration Minerals in the Longtoushan Pb-Zn Deposit, SW China

Remote Sensing, 2022
Hydrothermal alteration minerals are an effective prospecting indicator. Advanced spaceborne thermal emission and reflection radiometer (ASTER) satellite data are some of the most commonly adopted multispectral data for the mapping of hydrothermal ...
Jia-Xi Zhou
exaly   +3 more sources

Lithological and Hydrothermal Alteration Mapping of Epithermal, Porphyry and Tourmaline Breccia Districts in the Argentine Andes Using ASTER Imagery

Remote Sensing, 2018
The area of interest is located on the eastern flank of the Andean Cordillera, San Juan province, Argentina. The 3600 km2 area is characterized by Siluro-Devonian to Neogene sedimentary and igneous rocks and unconsolidated Quaternary sediments ...
Cecilia Villanueva, David R Cooke
exaly   +3 more sources

Mineralogical evidence for hydrothermal alteration of Bennu samples. [PDF]

Nat Geosci
Samples of asteroid (101955) Bennu delivered by the OSIRIS-REx mission offer the opportunity to study pristine planetary materials unchanged by exposure to the terrestrial environment. Here we use a combination of X-ray diffraction and various electron microscopy techniques to explore the detailed mineralogy of Bennu samples and determine the ...
Zega TJ, McCoy TJ, Russell SS, Keller LP, Gainsforth Z, Singerling SA, Manga VR, Harrison C, Libourel G, Prince BS, Thomas-Keprta K, King A, Portail M, Guigoz V, Tu V, Le L, Thompson M, Benner MC, Kerrison NA, Barnes JJ, Ong I, Haenecour P, Chaves L, Smith L, Kontogiannis M, Vega Santiago N, Hill D, Zeszut Z, Domanik K, Chang YJ, Corrigan CM, Ray S, Wardell LR, Gooding T, Rose TR, Bates HC, Schofield PF, Almeida NV, Salge T, Najorka J, Seifert LB, Lunning N, Righter K, Nguyen AN, Brenker FE, Eckley SA, Dworkin JP, Jones RH, Sandford SA, Marcus MA, Bechtel HA, Dominguez G, Yurimoto H, Kawasaki N, Bajo K, Sakamoto N, Zanetta PM, Tachibana S, Busemann H, Hamilton VE, Franchi IA, Grady M, Greenwood RC, Tait K, Timms N, Bland P, Jourdan F, Reddy SM, Rickard W, Saxey D, Vincze L, Connolly HC, Lauretta DS.   +72 more
europepmc   +6 more sources

Integrated geophysical, mineralogical, and geochemical investigation of gold and associated hydrothermal minerals in the Um Balad Area, Eastern Desert, Egypt [PDF]

Scientific Reports
Gold exploration in structurally complex Precambrian terranes remains challenging due to the heterogeneous distribution of hydrothermal alteration zones and the difficulty of distinguishing mineralization-related structures from regional tectonic ...
Mohamed H.Mahmoud, Mahmoud Abd El-Rahman Hegab, Abdelhamid Elbshbeshi, Sultan A. S. Araffa   +3 more
doaj   +2 more sources

Hydrothermal alteration in the Witwatersrand goldfields

Ore Geology Reviews, 2015
Abstract Alteration is recorded throughout much of the 3 km thick Upper Witwatersrand succession in South Africa, and extends for 300 km around the basin and 50 km into the basin. The evidence for this alteration comes from petrography, mineralogy, geochemistry, rock fabrics and stratigraphy.
G Neil Phillips
exaly   +2 more sources

Surface Alteration of Pollucite under Hydrothermal Conditions [PDF]

Journal of Nuclear Science and Technology, 1990
In connection with studies for evaluating the leachability of Cs from solidified radio-active waste, the surface alteration of pollucite was studied under hydrothermal conditions. Pollucite exposed to NaCl or KCl at 300°C formed on its surface a precipitate phase of analcime in the case of NaCl or leucite in the case of KCl.
Hitoshi Mimura, Kenichi Akiba
exaly   +2 more sources

Quantifying Hydrothermal Alteration: A Review of Methods

Geosciences (Switzerland), 2018
Hydrothermal alteration is proximal to many base and precious metal deposits, and its products can provide insights into the characteristics of hydrothermal systems.
Lucie Mathieu
exaly   +3 more sources

Hydrothermal weakening and slope instability at Vulcano (Italy) analyzed using drones and in-situ strength measurements [PDF]

Communications Earth & Environment
Instability at volcanic edifices poses significant hazards, yet the processes driving rock weakening, particularly on steep, eroding flanks, remain poorly understood due to limited accessibility.
Benjamin F. De Jarnatt, Thomas R. Walter, Michael J. Heap, Daniel Müller, Antonino Fabio Pisciotta   +4 more
doaj   +2 more sources