Results 1 to 10 of about 3,672,412 (277)

Chemical composition and crystal structure of merrillite from the Suizhou meteorite [PDF]

American Mineralogist, 2015
Merrillite, ideally Ca9NaMg(PO4)7, is an important accessory phosphate mineral in many different groups of meteorites, including martian meteorites, and a major carrier of rare earth elements (REE) in lunar rocks. By means of electron microprobe analysis,
Xiangping Gu, Xiande Xie, Robert Downs   +2 more
exaly   +3 more sources

THE COMPOSITION OF THE CHASSIGNY METEORITE

Meteoritics, 1976
Spark source mass spectrometric analysis of the Chassigny meteorite has given the following data (in ppm): Rb 0.4, Sr 7.2, Y 0.64, Zr 1.5, Nb 0.32, Ba 7.1, La 0.39, Ce 1.12, Pr 0.13, Nd 0.54, Sm 0.11, Eu 0.038, Gd 0.11, Tb 0.02, Dy 0.12, Ho 0.03, Er 0.09, Yb 0.10, Pb 1.0, Th 0.057, U 0.021.
Brian Mason, J.A. Nelon, P. Muir, S.R Taylor   +3 more
exaly   +3 more sources

The petrography and chemical composition of the Bruderheim meteorite [PDF]

Journal of Geophysical Research, 1961
The Bruderheim meteorite, a hypersthene chondrite, has been examined both petrographically and chemically. The minerals of the meteorite are olivine (Fo_(78)), hypersthene (En_(78)), plagioclase (Ab_(95)), apatite, merrillite, chromite, troilite, and metallic iron-nickel.
Duke, Michael, Maynes, Donald, Brown, Harrison   +2 more
semanticscholar   +5 more sources

Meteorite zircon constraints on the bulk Lu−Hf isotope composition and early differentiation of the Earth

Proceedings of the National Academy of Sciences of the United States of America, 2015
Significance The radioactive decay of lutetium-176 to hafnium-176 has been used to study Earth’s crust−mantle differentiation that is the primary agent of the chemical and thermal evolution of the silicate Earth.
Yuri Amelin, Tsuyoshi Iizuka, Yuki Hibiya   +2 more
exaly   +2 more sources

Connecting Meteorite Spectra to Lunar Surface Composition Using Hyperspectral Imaging and Machine Learning

Universe
We present an innovative, cost-effective framework integrating laboratory Hyperspectral Imaging (HSI) of the Bechar 010 Lunar meteorite with ground-based lunar HSI and supervised Machine Learning (ML) to generate high-fidelity mineralogical maps.
Fatemeh Fazel Hesar, Mojtaba Raouf, Amirmohammad Chegeni, Peyman Soltani, Bernard Foing, Elias Chatzitheodoridis, Michiel J. A. de Dood, Fons J. Verbeek   +7 more
doaj   +2 more sources

Polycyclic aromatics in the Chang’E 5 lunar soils [PDF]

Nature Communications
Polycyclic aromatics are ubiquitous in the interstellar medium and meteorites, yet the search for lunar polycyclic aromatics remains a significant challenge. Here, we analyze Chang’E-5 lunar soil samples, revealing polycyclic aromatic concentrations of 5.
Guangcai Zhong, Xin Yi, Shutao Gao, Shizhen Zhao, Yangzhi Mo, Lele Tian, Buqing Xu, Fu Wang, Yuhong Liao, Tengfei Li, Liangliang Wu, Yunpeng Wang, Yingjun Chen, Yue Xu, Sanyuan Zhu, Linbo Yu, Jun Li, Ping’an Peng, Gan Zhang   +18 more
doaj   +2 more sources

Kivesvaara C2 chondrite: silicate petrography and chemical composition [PDF]

Bulletin of the Geological Society of Finland, 1983
Fragments of the Kivesvaara meteorite were said to have been found in Paltamo, northern Finland in 1968. The chemical and mineral composition and the textural features show that this meteorite is a rare C2 carbonaceous chondrite.
K.A. Kinnunen, R. Saikkonen
doaj   +1 more source

Ore Petrography, Mineralogical and Chemical Composition of New Iron Meteorite (Al-Sherqat Meteorite) from Iraq

Iraqi Geological Journal, 2021
The meteorite with a single total mass of 630 gm as a visible meteorite has fallen on 22 March 2021, at 10:00 a.m. in Al-Sherqat subdistrict within Salah Al-Din, northern Iraq; and therefore, was named Al-Sherqat meteorite by the authors.
Salih Awadh
doaj   +1 more source

Terrestrial modification of the Ivuna meteorite and a reassessment of the chemical composition of the CI type specimen [PDF]

Geochimica et Cosmochimica Acta, 2019
The rare CI carbonaceous chondrites are the most aqueously altered and chemically primitive meteorites but due to their porous nature and high abundance of volatile elements are susceptible to terrestrial weathering.
A. King, K. Phillips, S. Strekopytov, C. Vita-Finzi, S. Russell   +4 more
semanticscholar   +1 more source

Quantitative Analysis of Meteorite Elements Based on the Multidimensional Scaling–Back Propagation Neural Network Algorithm Combined with Raman Mapping-Assisted Micro-Laser Induced Breakdown Spectroscopy

Chemosensors, 2023
Meteorites are an essential reference for human exploration of the universe and its cosmic evolution and an essential research object for searching for extraterrestrial life. Ways to quickly identify and screen suspected meteorite samples have become the
Hongpeng Wang, Yingjian Xin, Peipei Fang, Yian Wang, Mingkang Duan, Wenming Wu, Ruidong Yang, Sicong Liu, Liang Zhang, Xiong Wan   +9 more
doaj   +1 more source