Results 51 to 60 of about 34,079 (237)
Meteoritics &Planetary Science, EarlyView.Abstract We report new results from a study of shock‐related features in the L6 ordinary chondrites Northwest Africa (NWA) 4672 and NWA 12841. Our observations confirm the occurrence of eight high‐pressure (HP) minerals in each meteorite, namely, ringwoodite, majorite, akimotoite, wadsleyite, albitic jadeite, lingunite, tuite, and xieite.
I. Baziotis +5 more
wiley +1 more source
Geologia Croatica, 2016 The paper presents data about geology, geochemistry, structure, genesis and specific features of the Bučim, porphyry Cu deposit with active mining in Macedonia.
Todor Serafimovski +4 more
doaj +1 more source
Analysis and evaluation of fragment size distributions in rock blasting at the Erdenet Mine [PDF]
, 2015 Master's Project (M.S.) University of Alaska Fairbanks, 2015Rock blasting is one of the most important operations in mining. It significantly affects the subsequent comminution processes and, therefore, is critical to successful mining productions.
Dondov, Erdenebaatar +1 more
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Microspherules Formed by Lightning Strikes
Meteoritics &Planetary Science, EarlyView.Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley +1 more source
Geophysical Research Letters, 2023 Porphyry copper ore‐forming intrusions are distinguished from barren arc magmas by high oxidation state and “adakitic” high Sr/Y and La/Yb. Controversy over petrogenesis of adakites has centered on ambiguities in interpretation of their steep rare earth ...
Lucas Tatnell +2 more
doaj +1 more source
The Geologic Features of the Occurrence of Copper in North America [PDF]
, 1933 Copper is of such widespread natural occurrence in North America and there are so few metal-mining districts that have not contributed to its production that it is obviously necessary in any brief general treatment of the geology of the copper deposits ...
Ransome, F. L.
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Mountain‐top spherules: Criteria to identify natural and synthetic particles
Meteoritics &Planetary Science, EarlyView.Abstract Natural microspherules are important tracers of geologic and environmental processes in modern and ancient deposits. However, anthropogenic contamination can dilute natural collections by releasing synthetic microspherules into the environment.
M. R. Boyd, M. J. Genge
wiley +1 more source
Platonism and Christian Thought in Late Antiquity [PDF]
, 2019 Platonism and Christian Thought in Late Antiquity examines the various ways in which Christian intellectuals engaged with Platonism both as a pagan competitor and as a source of philosophical material useful to the Christian faith.
Emilsson, Eyjolfur +3 more
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A laboratory study on cold-mix, cold-lay emulsion mixtures [PDF]
, 2009 This paper describes laboratory experiments and presents results for the performances of cold-mix, cold-lay emulsion mixtures. The main objective of the experiments was to evaluate and improve the properties of the cold mixtures.
Aderson A. +23 more
core +1 more source
Aqueous alteration in C2‐ung Bells through the analysis of carbonates – Does a CR origin ring true?
Meteoritics &Planetary Science, EarlyView.Abstract Bells is an ungrouped carbonaceous chondrite that has in recent years been proposed as a CR‐an. This link to CR chondrites has previously been identified through the analysis of anhydrous silicates, for example, oxygen isotopic compositions of olivine (Marrocchi et al., 2023).
L. J. Riches +4 more
wiley +1 more source