Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Erik B. Melchiorre"'
Autor:
Akumbom Vishiti, Cheo Emmanuel Suh, Ralain Bryan Ngatcha, Erik B. Melchiorre, Elisha Mutum Shemang, Benjamin Odey Omang, Terence Cho Ngang, Fernando Castro Valdez, Sharila Gillian Sekem
Publikováno v:
Minerals, Vol 14, Iss 6, p 567 (2024)
The identification of trace element anomalies in soils has been proven to assist semi-mechanized small-scale gold operations. This study employs soil geochemistry combined with the microchemical signature of particulate gold from the Batouri goldfiel
Externí odkaz:
https://doaj.org/article/c08db60709554d3d9634ffa9bfe9cd2d
Publikováno v:
Minerals, Vol 13, Iss 11, p 1444 (2023)
Geochemical overprinting on placer gold deposits produces complex deposits with apparently paradoxical geochemical and morphological attributes. The La Cholla placer gold deposits near Quartzsite, Arizona, USA, contain sharp and often undamaged gold
Externí odkaz:
https://doaj.org/article/8619526e38b7423f8195a8274c0796af
Publikováno v:
Journal of Marine Science and Engineering, Vol 7, Iss 7, p 209 (2019)
Black crusts that formed on gold coins recovered from the 1857 shipwreck of the SS Central America played a key role in their preservation in a near original state. Within a few years of the sinking, the significant quantities of iron and steel on th
Externí odkaz:
https://doaj.org/article/83d93e230e9f49cb89bf29aa1aa88683
Autor:
Erik B. Melchiorre, Paul M. Orwin, Frank Reith, Maria Angelica D. Rea, Jeff Yahn, Robert Allison
Publikováno v:
Minerals, Vol 8, Iss 2, p 56 (2018)
Placer gold from the Devils Nest deposits at Rich Hill, Arizona, USA, was studied using a range of micro-analytical and microbiological techniques to assess if differences in (paleo)-environmental conditions of three stratigraphically-adjacent placer
Externí odkaz:
https://doaj.org/article/cee65db82c574ac3bfa352157850039e
Autor:
Erik B. Melchiorre
Publikováno v:
Mineralogical Magazine. 86:634-643
The Girilambone copper deposit of New South Wales, Australia, serves as an end-member model for development of a classic oxidation-zone profile in an environment virtually free of both the effects of active tectonics and significant fluctuation in th
Publikováno v:
Mineralogical Magazine. 85:39-48
The assayers’ ingots recovered in 2014 from the SS Central America contain geochemical signatures and anomalies which convey information about the culture of miners and assayers in the late 1850s. A significant number of ingots (21%) contain elevat
Autor:
Justin Henderson, Erik B. Melchiorre
Publikováno v:
Ore Geology Reviews. 109:348-357
Topography plays a major role in the morphology, geochemistry , and mineral inclusion profiles of placer gold from the East Fork of the San Gabriel River. These trends are consistent with a significant change in topographic gradient over a short dist
Publikováno v:
Minerals
Volume 10
Issue 3
Minerals, Vol 10, Iss 3, p 215 (2020)
Volume 10
Issue 3
Minerals, Vol 10, Iss 3, p 215 (2020)
Spectral features for natural stichtite at 1042, 1096, 1360, 1638, and 3482 cm&minus
1 provide insights on mineral structure, with peaks consistent with OH&minus
stretching modes bound to Mg or Cr, CO32&minus
antisymmetric stretches an
1 provide insights on mineral structure, with peaks consistent with OH&minus
stretching modes bound to Mg or Cr, CO32&minus
antisymmetric stretches an
Publikováno v:
Precambrian Research. 310:198-212
A record of the conditions and duration of Archean serpentinization is preserved as chemical, isotopic, and textural properties of the magnesium-chromium hydroxycarbonate mineral stichtite. This provides a window into the conditions associated with a
Publikováno v:
Journal of Arid Environments. 148:45-53
Arid environment nitrate deposits are economically important and analogous to Martian environments, but their formation is poorly understood. Detailed N, O, and C isotope stratigraphy suggests Atacama Desert nitrate deposits form abiologically by dif