Results 71 to 80 of about 26,069 (224)
The potential of obsidian "big data"
UISPP Journal, 2019 Studies of obsidian provenance have been a core component of the archaeological sciences from the mid-1960s onward. With the growing application of portable X-ray Fluorescence Spectrometers (PXRF) in obsidian research, the number of such studies, and the
Mark Golitko
doaj +1 more source
Open Archaeology, 2019 The Aeolian island of Lipari, just north of eastern Sicily, was a major geological source of high quality obsidian that was volcanically formed in the Late Mesolithic, followed by another major production in the 1st millennium AD. A much earlier volcanic
Tykot Robert H.
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Oxygen isotopic evidence for accretion of Earth's water before a high-energy Moon-forming giant impact [PDF]
, 2018 The Earth-Moon system likely formed as a result of a collision between two large planetary objects. Debate about their relative masses, the impact energy involved, and the extent of isotopic homogenization continues.
Barrat +19 more
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Earth and Space Science, Volume 13, Issue 5, May 2026.Abstract The Lunar Trailblazer mission launched in February of 2025 with the goal of characterizing lunar surface water through a targeted campaign. One instrument on the mission, the Lunar Thermal Mapper (LTM), was tasked with measuring the surface temperature to compare with maps of the form and abundance of water on the lunar surface.
Katherine A. Shirley +11 more
wiley +1 more source
Tracing the source of obsidian from prehistoric sites in Bulgaria
Българско е-Списание за Археология, 2017 Portable X-ray fluorescence (pXRF) spectrometry was used to obtain source determinations for 11 obsidian artefacts from five archaeological sites in Bulgaria. The results show that all the archaeological specimens can be linked to obsidian sources in the
Clive Bonsall +7 more
doaj
Constraining the Hydration of Clay Minerals and Abundances of Amorphous Phases in Gale Crater, Mars
Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.Abstract Both water and organic matter are required for the development and persistence of life. Phyllosilicates (clay minerals) have high surface areas that easily sorb water and organic matter. The Curiosity rover has investigated several hundred meters of stratigraphy in Gale crater, including where clays were detected from orbit.
Sean Czarnecki +3 more
wiley +1 more source
Measurement of water in rhyolitic glasses; calibration of an infrared spectroscopic technique [PDF]
, 1986 A series of natural rhyolitic obsidians were analyzed for their total water contents by a vacuum extraction technique. The grain size of the crushed samples can significantly affect these analyses.
Epstein, Samuel +2 more
core
Aqueous alteration in C2‐ung Bells through the analysis of carbonates – Does a CR origin ring true?
Meteoritics &Planetary Science, Volume 61, Issue 5, Page 927-941, May 2026.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
Journal of Lithic Studies, 2018 The aim of this paper is to report the first analyses carried out on obsidian artifacts recovered from two archaeological sites of the Tafí valley (Tucumán, Argentina), dating to the first and second millennium C.E.
Juan Manuel Montegú +2 more
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Character of the opposition effect and negative polarization [PDF]
Photometric and polarimetric properties at small phase angles were measured for silicates with controlled surface properties in order to distinguish properties that are associated with surface reflection from those that are associated with multiple ...
Pieters, Carle M. +2 more
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