Results 251 to 260 of about 32,006 (319)

Dynamics, EPMA Th‐U‐Total Pb Monazite Geochronology and Tectonic Implications of Deformational Fabric in the Lower‐Middle Crustal Rocks: A Case Study of Ambaji Granulite, NW India

Tectonics, 2019
Strain fabric and monazite microstructure were studied and dated by Electron Probe Microanalyser (EPMA) in situ Th‐U‐total Pb monazite geochronology in the Ambaji granulite, South Delhi terrane, NW India.
S. K. Tiwari, T. K. Biswal
semanticscholar   +1 more source

Water Vapor-Assisted "Universal" Nonmatrix-Matched Analytical Method for the in Situ U-Pb Dating of Zircon, Monazite, Titanite, and Xenotime by Laser Ablation-Inductively Coupled Plasma Mass Spectrometry.

Analytical Chemistry, 2018
The U-Pb geochronologic analysis of accessory minerals has played an important role in Earth and solar system science in constraining the ages of a wide variety of rocks and minerals. Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS)
Tao Luo, Zhaochu Hu, Wen Zhang, Yongsheng Liu, K. Zong, Lian Zhou, Junfeng Zhang, Shenghong Hu   +7 more
semanticscholar   +1 more source

Paleoproterozoic metamorphism in the northern Fennoscandian Shield: age constraints revealed by monazite

Soviet Economy, 2019
We have identified two contrasting styles of Paleoproterozoic metamorphism in the northern part of the Fennoscandian Shield. The Karelia and Lapland-Kola Provinces, comprising Archean and overlying Paleoproterozoic supracrustal rocks, show a typical ...
P. Hölttä, H. Huhma, Y. Lahaye, I. Mänttäri, S. Lukkari, H. O’Brien   +5 more
semanticscholar   +1 more source

Constraining the timing and character of crustal melting in the Adirondack Mountains using multi-scale compositional mapping and in-situ monazite geochronology

American Mineralogist, 2019
Migmatites are common in the hinterland of orogenic belts. The timing and mechanism (in situ vs. external, P-T conditions, reactions, etc.) of melting are important for understanding crustal rheology, tectonic history, and orogenic processes.
Michael L. Williams, T. Grover, M. Jercinovic, S. Regan, Claire R. Pless, Kaitlyn A. Suarez   +5 more
semanticscholar   +1 more source

Provenance analysis of detrital monazite, zircon and Cr‐spinel in the northern Tibetan Plateau: Implications for the Paleozoic tectonothermal history of the Altyn Tagh and Qimen Tagh Ranges

Basin Research, 2019
Sediment provenance studies have proven to be an effective method to extract the sediment provenance and tectonic process information recorded by detrital minerals.
Wenping Zhu, Chaodong Wu, Jialin Wang, Tianqi Zhou   +3 more
semanticscholar   +1 more source

Constitution of Monazite

Nature, 1948
X-RAY examination of monazite has been carried out by Hadding1, Gliszczynski2 and Parrish3, and the space group and crystal class uniquely determined. According to Goldschmidt4, the thorium which is usually present is ‘‘captured during crystallization of the phosphate from its parent magma because of its favourable ionic size.
openaire   +1 more source

Lead diffusion in monazite

Geochimica et Cosmochimica Acta, 1997
Abstract We have measured the tracer diffusion rate of Pb in natural, annealed, gem-quality monazite from Alexander Co., NC, USA, and Riverside Co., CA, USA. Observations from the literature concerning low T annealing in monazite suggest the possibility that Pb diffusion at geologic conditions occurs, in effect, within a similarly annealed lattice ...
Harold A. Smith, Bruno J. Giletti
openaire   +1 more source

Controlled leaching of monazites

Journal of Geophysical Research, 1967
The difficulties of obtaining a clear-cut geological interpretation of calculated isotopic ages are often increased by the presence of discordant age patterns. Although such patterns have been reported for most uranium-thorium bearing minerals, age determinations on monazites may exhibit distinctly more pronounced discrepancies.
A. J. Burger, L. O. Nicolaysen, L. H. Ahrens   +2 more
openaire   +1 more source

Oxygen diffusion in monazite

Earth and Planetary Science Letters, 2004
Abstract We report measurements of oxygen diffusion in natural monazites under both dry, 1-atm conditions and hydrothermal conditions. For dry experiments, 18O-enriched CePO4 powder and monazite crystals were sealed in Ag–Pd capsules with a solid buffer (to buffer at NNO) and annealed in 1-atm furnaces.
D.J. Cherniak, X.Y. Zhang, M. Nakamura, E.B. Watson   +3 more
openaire   +1 more source

Deformation twinning in monazite

Acta Materialia, 2003
Abstract Polycrystalline monazite (LaPO4) was deformed at room temperature by a spherical indenter. Deformation twins were identified by TEM in 70 grains. Five twin planes were found: (1 0 0) was by far the most common; (0 0 1) and (1 2 0) were less common; ( 1 2 2 ) was rare, and kinks in (1 2 0) twins were identified as irrational ′(
R.S Hay, D.B Marshall
openaire   +1 more source