Results 21 to 30 of about 1,225 (202)

A review of machine learning in geochemistry and cosmochemistry: Method improvements and applications

, 2022
The development of analytical and computational techniques and growing scientific funds collectively contribute to the rapid accumulation of geoscience data.
Wen, Tao, Zhang, Shuang, He, Yuyang, Ma, Xiaogang, Zhu, Yueqin, Zhou, You, Huang, Fang, 何雨旸, Zou, Xinyu, Yueqin Zhu, You Zhou, Shuang Zhang, Yuyang He, Fang Huang, Xiaogang Ma, Xinyu Zou, Tao Wen   +16 more
core   +1 more source

Origin of ocean island basalts in the West African passive margin without mantle plume involvement

Nature Communications, 2019
The genesis of hotspot magmatism remains controversial especially at continental margins such as offshore West Africa. Here, by analysing trace element and Pb isotopes of intraplate basalts, the authors conclude that their generation was caused by the ...
Iyasu Getachew Belay, Ryoji Tanaka, Hiroshi Kitagawa, Katsura Kobayashi, Eizo Nakamura   +4 more
doaj   +1 more source

Cretaceous-Tertiary boundary deposits in Denmark: A diachroneity [PDF]

Journal of the Serbian Chemical Society, 2004
The lateral distribution of predominantly terrestrial kerogen or humics enriched with copper(II) porphyrins (Cu-P) across the Danish marine basin implies that the alleged Cretaceous-Tertiary (KT) boundary deposits in western Denmark (at the Nye Kløv ...
Premović Pavle I.
doaj   +1 more source

The vanadium isotopic constitution of petroleum asphaltenes: La Luna Formation (Venezuela) [PDF]

Journal of the Serbian Chemical Society, 2000
High resolution mass spectrometry indicates that the isotopic abundance of 50Vanadium (V) of the Late Cretaceous La Luna petroleum asphaltenes and related source kerogen of marine origin (both highly enriched with V > 2000 ppm) is higher by ...
Premović Pavle I., Đorđević Dragan M., Tonsa Ivan A.R., López Liliana, Lomonaco Salvador, Pavlović Mirjana S., Veljković Miomir V., Nešković Olivera M.   +7 more
doaj   +1 more source

A New Insight Into Seawater-Basalt Exchange Reactions Based on Combined δ18O—Δ′17O—87Sr/86Sr Values of Hydrothermal Fluids From the Axial Seamount Volcano, Pacific Ocean

Frontiers in Earth Science, 2021
The δ18O values of submarine vent fluids are controlled by seawater-basalt exchange reactions, temperature of exchange, and to a lesser extent, by phase separation.
D. O. Zakharov, R. Tanaka, D. A. Butterfield, E. Nakamura   +3 more
doaj   +1 more source

Thermochemical equilibrium calculations of high-temperature O2 generation on the early Earth: Giant asteroid impact on land [PDF]

Journal of the Serbian Chemical Society, 2003
Earth’s atmosphere is composed primarily of N2 and O2. The origin of free O2 in the early Earth’s atmosphere is still subject of considerable debate.1 Theoretical models suggest that the initial form of free O2 in the atmosphere has been oceanic H2O ...
Premović Pavle I.
doaj   +1 more source

Evidence for Very Early Planetesimal Formation and 26Al/27Al Heterogeneity in the Protoplanetary Disk

The Astrophysical Journal Letters, 2023
We present a U-corrected Pb–Pb age of 4566.19 ± 0.20 Ma (1.11 ± 0.26 Myr after t _0 ) for the moderately volatile element rich, andesitic meteorite Erg Chech 002 (EC002). Our Al–Mg isochron defines a ^26 Al/ ^27 Al initial ratio of (8.65 ± 0.09) × 10 ^−6
J. N. Connelly, J. Bollard, E. Amsellem, M. Schiller, K. K. Larsen, M. Bizzarro   +5 more
doaj   +1 more source

Diversity, Equity, and Inclusion: tackling under-representation and recognition of talents in Geochemistry and Cosmochemistry [PDF]

, 2021
Diversity, at every step along the scientific path, drives innovative research. Scientific societies, like the Geochemical Society (GS) and the European Association of Geochemistry (EAG), have a significant influence over which discoveries and innovators
Carbonne, Johanna Marin, Anand, Pallavi, Middleton, Jennifer, Bots, Pieter, Dosseto, Anthony, Marin Carbonne, Johanna, Riches, Amy J.V., Ngwenya, Bryne, Arndt, Sandra, Li, Zimin, Riches, Amy, Pourret, Olivier, Riches, Amy A.J.V., J. V. Riches, Amy, Pieter Bots, Zimin Li, Amy J.V. Riches, Johanna Marin Carbonne, Pallavi Anand, Anthony Dosseto, Jennifer Middleton, Sandra Arndt, Bryne Ngwenya, Olivier Pourret   +23 more
core   +4 more sources

A brief history of the Department of Cosmoecology and Cosmic Mineralogy (to 50-anniversary of M. P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation NAS of Ukraine)

Геофизический журнал, 2019
The history of origin and evolution in Ukraine of mineralogical studies of cosmic samples, mainly meteorites, and the main stages of formation of the Department of Сosmoecology and Cosmic Mineralogy at the M. P.
V. P. Semenenko
doaj   +1 more source

More than 30 000 volunteers involved in identification of tiny rare interstellar dust particle candidates collected by the Stardust mission

Heidelberger Jahrbücher Online, 2017
The NASA Stardust mission returned the first tiny samples of interstellar dust from beyond the borders of our solar system. This region is almost devoid of matter and the interstellar dust particles floating through our solar system are extremely rare ...
Andrew J. Westphal, Mario Trieloff
doaj   +1 more source