Zobrazeno 1 - 10
of 108
pro vyhledávání: '"John S. Armstrong-Altrin"'
Autor:
Armel Zacharie Ekoa Bessa, Marie Ganmo Koutchouo, Elvine Paternie Edjengte Doumo, Naomie Kayitesi Manishimwe, Romeo Junior Ngnitedem Tanantsap, Jordan Garcia Tchadji Djoban, Boris Secke Bekonga Gouott, John S. Armstrong-Altrin
Publikováno v:
Geosystems and Geoenvironment, Vol 3, Iss 1, Pp 100249- (2024)
This study aims to assess the pollution levels and sources of heavy metals (Al, Mn, Co, Ni, Sc and V) and radionuclides (Th and U) in sediments of Lékié Watershed in Cameroon. Surface sediment samples were collected from 14 stations across differen
Externí odkaz:
https://doaj.org/article/4a07cc0afa6f497a80769e9024ada90c
Autor:
Victorine Ambassa Bela, Armel Zacharie Ekoa Bessa, John S. Armstrong-Altrin, Francis Aonsi Kamani, Estelle Diane Biami Nya, Gabriel Ngueutchoua
Publikováno v:
Solid Earth Sciences, Vol 8, Iss 2, Pp 105-122 (2023)
The provenance of clastic sediments in stream beds, river terraces, rivers, swamps, lakes and beaches from different geological settings was investigated based on their compositional and geochemical variations. The geochemistry data of 622 sediment s
Externí odkaz:
https://doaj.org/article/112d7363bb60477ea258ac3f47f42ee8
Autor:
John S. Armstrong-Altrin
Publikováno v:
Journal of Palaeogeography, Vol 9, Iss 1, Pp 1-27 (2020)
Abstract Zircons are abundant in the beach sediments. In this study, surface microtexture, mineralogy, bulk sediment geochemistry, trace element composition and U–Pb isotopic geochronology of detrital zircons collected from the Riachuelos and Palma
Externí odkaz:
https://doaj.org/article/85c9370703d14da7a610647a85877881
Autor:
Abigail Anaya-Gregorio, John S. Armstrong-Altrin, María Luisa Machain-Castillo, Patricia C. Montiel-García, Mayla A. Ramos-Vázquez
Publikováno v:
Journal of Palaeogeography, Vol 7, Iss 1, Pp 1-19 (2018)
Abstract Texture, mineralogy, geochemistry, and 14C ages of two deep-sea sediment cores (GM6 and GM7) recovered in the southwestern Gulf of Mexico were investigated to infer their provenance and depositional condition. The sediments are enriched in f
Externí odkaz:
https://doaj.org/article/5e9b2dfa8e444a1ba49385ae8faf4ca0
Autor:
Surendra P. Verma, Sanjeet K. Verma, M. Abdelaly Rivera-Gómez, Darío Torres-Sánchez, Lorena Díaz-González, Alejandra Amezcua-Valdez, Beatriz Adriana Rivera-Escoto, Mauricio Rosales-Rivera, John S. Armstrong-Altrin, Héctor López-Loera, Fernando Velasco-Tapia, Kailasa Pandarinath
Publikováno v:
Journal of Spectroscopy, Vol 2018 (2018)
We applied both the ordinary linear regression (OLR) and the new uncertainty weighted linear regression (UWLR) models for the calibration and comparison of a XRF machine through 59 geochemical reference materials (GRMs) and a procedure blank sample.
Externí odkaz:
https://doaj.org/article/77e50682270b46749008ca2cb1ac2cd5
Autor:
John S. Armstrong-Altrin
Publikováno v:
Carpathian Journal of Earth and Environmental Sciences. 17:245-258
The Terminos Lagoon is a region of great environmental and economic importance, due to its biodiversity, abundance of natural resources and proximity to the Campeche Sound. These characteristics encourage the development of numerous human activities
Publikováno v:
Journal of Palaeogeography. 11:256-274
Publikováno v:
Arabian Journal of Geosciences. 16
Autor:
Francis Aonsi Kamani, Yasser A. El‑Amier, Vanisa Njimanu Njong, Gabriel Ngueutchoua, Leonel Ngueudong Zebaze, Victorine Ambassa Bela, John S. Armstrong‑Altrin, Franck Eitel Kemgang Ghomsi, Christelle Aimée Kamguem Fotso, Mohammad Valipour, Armel Zacharie Ekoa Bessa
Publikováno v:
Earth Systems and Environment. 6:175-187
Beach sediment samples collected along the central part of the Littoral zone of Cameroon were geochemically analyzed using ICP–MS to investigate the distribution characteristics and to identify trace metal concentrations. The textural characteristi
Textural characteristics and abundance of microplastics in Tecolutla beach sediments, Gulf of Mexico
Publikováno v:
Environmental Monitoring and Assessment. 194