Results 51 to 60 of about 47,799 (141)

REE minerals at the Songwe Hill carbonatite, Malawi: HREE-enrichment in late-stage apatite [PDF]

, 2017
Compared to all published data from carbonatites and granitoids, the fluorapatite compositions in the Songwe Hill carbonatite, determined by EPMA and LA ICP-MS, have the highest heavy (H)REE concentration of any carbonatite apatite described so far.
Gunn, Gus, Brady, Aoife E., Dawes, William, Wall, Frances, Broom-Fendley, Sam   +4 more
core   +1 more source

Fluorapatite from a Pegmatite with Miarolitic Cavities in the Larsemann Hills, East Antarctica: ID-TIMS U-Pb Ages and LA-ICP-MS Trace-Element Constraints on the Late Pan-African Orogenic Evolution

Geosciences
Pegmatites with miarolitic cavities have not previously been reported from the Larsemann Hills, East Antarctica, and their age and origin remain poorly constrained.
Ivan A. Babenko, Nailya G. Rizvanova, Sergey G. Skublov, Yuri A. Bishaev, Irina V. Talovina, Olga L. Galankina, Alexander V. Kuznetsov   +6 more
doaj   +1 more source

Modeling the geochemical distribution of rare earth elements (REEs) using multivariate statistics in the eastern part of Marvast placer, the Yazd province

Journal of Economic Geology, 2017
Introduction Nowadays, exploration of rare earth element (REE) resources is considered as one of the strategic priorities, which has a special position in the advanced and intelligent industries (Castor and Hedrick, 2006).
Amin Hossein Morshedy, Amir Hossein Kouhsari , Mohammad Reza Shakery Varzaneh   +2 more
doaj   +1 more source

Mineralogical and geochemical study of apatite and dolomite from the Bayan Obo giant Fe-REE-Nb deposit in Inner Mongolia: New evidences for genesis

, 2019
The Bayan Obo Fe-REE-Nb deposit is the world's largest resource of REE and its origin still remains controversial. To decipher the genesis of this unique deposit, we conducted a detailed mineralogical observations using scanning electron microscope (SEM),
REN, Yisu, YANG, Xiaoyong, WANG, Shuangshuang, Ozturk, Hüseyin, Yisu Ren, Xiaoyong Yang, Shuangshuang Wang, Hüseyin Öztürk   +7 more
core   +1 more source

Relative REE abundances of porewater in Pacific pelagic sediment: estimation by equilibrium calculations based on REE composition of Mn-oxide and apatite components [PDF]

2007-12-25In order to reveal REE mobilization in sediment during early diagenesis, we estimate the REE composition of porewater in Pacific sediments deposited in the Equatorial area.
YAMAMOTO, Koshi, TAKEBE, Masamichi, 31591, 31590   +3 more
core   +2 more sources

CI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.
Abstract CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.
Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang   +11 more
wiley   +1 more source

Mine waste from carbonatite deposits as potential rare earth resource: Insight into the Phalaborwa (Palabora) Complex [PDF]

, 2022
The Phalaborwa (Palabora) Igneous Complex (PIC), South Africa, has been mined for the last six decades for copper and phosphate, among others commodities. As a result, more than 4500 Mt. of mining wastes have been deposited in waste rock dumps (WRDs) and
Heerden, Esta van, Maleke, Maleke, Caraballo, Manuel A., Yesares Ortiz, María Dolores, Sáez Ramos, Reinaldo, Gómez Arias, Alba, Vermeulen, Danie, Nieto Liñán, José Miguel, Sáez, Reinaldo, Nieto, José Miguel, Díaz, Joaquín, Caraballo Monge, Manuel Antonio, Castillo Hernández, Julio Cesar, Julio Castillo, Lola Yesares, Manuel A. Caraballo, Esta van Heerden, Reinaldo Sáez, Danie Vermeulen, José M. Nieto, Maleke Maleke, Joaquín Díaz, Alba Gómez-Arias   +22 more
core   +1 more source

Multidisciplinary Analyses of Terrestrial Samples Used to Interpret an Inorganic Origin (Anhydrite:Ce3+) for the 304 and 325‐nm Doublet Fluorescence Detected by the Mars 2020 SHERLOC Instrument at Jezero Crater

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract Doublet fluorescence at 304 and 325‐nm under deep ultraviolet (DUV) excitation was detected on Mars at Jezero crater by the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument onboard the Mars 2020 rover Perseverance.
N. C. Haney, R. V. Morris, R. S. Jakubek, J. V. Clark, J. I. Simon, W. P. Buckley, R. T. Downs, E. B. Rampe, R. M. G. Armytage, T. G. Graff, A. S. Burton, F. M. McCubbin, E. L. Berger, V. M. Tu, P. D. Casbeer, S. A. Mertzman, K. H. Williford, E. L. Scheller, T. Fornaro, S. Siljeström, A. Steele, K. P. Hand, T. J. Lapen   +22 more
wiley   +1 more source

Early, deep magnetite-fluorapatite mineralization at the Olympic Dam Cu-U-Au-Ag deposit, South Australia

, 2017
The Olympic Dam iron oxide copper-gold (IOCG)-uranium-silver deposit (South Australia) is hosted in the large Olympic Dam breccia complex within the ~1.59 Ga Roxby Downs Granite.
Cristiana L. Ciobanu, Vadim S. Kamenetsky, Jocelyn McPhie, Thompson, J., McPhie, J., Apukhtina, O., Kathy Ehrig, Kamenetsky, V., Nigel J. Cook, Maas, R., Kamenetsky, M., Cook, N., Maya B. Kamenetsky, Ehrig, K., Olga B. Apukhtina, Roland Maas, Jay Thompson, Ciobanu, C.   +17 more
core   +2 more sources

Apatite in Bennu samples indicates multiple stages of aqueous alteration

Meteoritics &Planetary Science, Volume 61, Issue 3, Page 504-521, March 2026.
Abstract Calcium phosphates are ubiquitous in planetary materials, including samples returned from asteroid Bennu by the OSIRIS‐REx mission. We characterized apatite [Ca5(PO4)3(F,Cl,OH)] grains in Bennu samples by scanning electron microscopy, electron microprobe analysis, and transmission electron microscopy to investigate their compositions, mineral ...
Laura B. Seifert, T. M. Erickson, L. P. Keller, J. J. Barnes, K. Thomas‐Keprta, L. Le, J. Gorce, Z. Rahman, T. J. Zega, H. C. Connolly Jr, D. S. Lauretta   +10 more
wiley   +1 more source