Results 21 to 30 of about 50,766 (267)

A comparison between in situ monazite Lu–Hf and U–Pb geochronology [PDF]

Geochronology
In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted cooling versus multiphase growth).
A. T. De Vries Van Leeuwen, A. T. De Vries Van Leeuwen, A. T. De Vries Van Leeuwen, S. Glorie, S. Glorie, M. Hand, M. Hand, J. Mulder, S. E. Gilbert   +8 more
doaj   +1 more source

Age and origin of fluorapatite-rich dyke from Baranec Mt. (Tatra Mts., Western Carpathians): a key to understanding of the post-orogenic processes and element mobility

Geologica Carpathica, 2016
On the southeastern slope of the Baranec Mount in the Western Tatra Mountains (Slovakia) an apatite-rich pegmatite-like segregation was found in the subvertical fault zone cutting metapelitic rocks.
Gawęda Aleksandra, Szopa Krzysztof, Chew David, Klötzli Urs, Müller Axel, Sikorska Magdalena, Pyka Paulina   +6 more
doaj   +1 more source

Crustal evolution of the western part of the Archean Gavião Block, São Francisco Craton, based on U-Pb, Sm-Nd and Rb-Sr evidence [PDF]

Geologia USP. Série Científica, 2013
The western part of the Gavião Block (São Francisco Craton) is one of the oldest fragments of the South American Platform. It comprises the Riacho de Santana Gneissic Migmatitic complex, the Santa Isabel complex and the Riacho de Santana greenstone belt.
Natali da Silva Barbosa, Wilson Teixeira, Luiz Rogério Bastos Leal, Angela Beatriz de Menezes Leal   +3 more
doaj   +1 more source

U–Pb ages of angrites

Geochimica et Cosmochimica Acta, 2008
Abstract Precise U–Pb ages, determined with double spike ( 202 Pb– 205 Pb) thermal ionization m1ass spectrometry, are reported for angrites Angra dos Reis (AdoR), Lewis Cliff 86010 (LEW), and D’Orbigny. Nineteen of 23 acid-washed pyroxene fractions from these meteorites and whole rock fractions from D’Orbigny contain between 0.5 and 1.3 pg of total ...
openaire   +2 more sources

Spatial and glacial‐interglacial variations in provenance of the Chinese Loess Plateau

Geophysical Research Letters, 2012
The Chinese Loess Plateau (CLP) covers an extensive area over 440,000 km2and provides an unprecedented terrestrial record of Neogene climate. However, it is still unclear whether the provenance of these loess deposits is uniform or contains spatial and ...
Guoqiao Xiao, Keqing Zong, Gaojun Li, Zhaochu Hu, Guillaume Dupont‐Nivet, Shuzhen Peng, Kexin Zhang   +6 more
doaj   +1 more source

In situ U-Pb Dating of Calcite from the South China Antimony Metallogenic Belt

iScience, 2020
Summary: Accurately determining the age of hydrothermal ore deposits is difficult, because of lack of suitable mineral chronometers and techniques. Here we present the first LA-MC-ICPMS U-Pb age of carbonates from hydrothermal Sb deposits.
Kai Luo, Jia-Xi Zhou, Yue-Xing Feng, I. Tonguc Uysal, Ai Nguyen, Jian-Xin Zhao, Jiawei Zhang   +6 more
doaj   +1 more source

Redefinition of Early Mesoproterozoic (1800–1600 Ma) stratigraphy in the northern Kongling area, China: The nucleus of Yangtze Craton and its tectonic significance

China Geology, 2019
: The Wujiatai Formation, which is well exposed in Huangjiatai-Xichahe region of the northern Kongling area of central Yangtze Craton, is a suite of epimetamorphic conglomerates to pebbly sandstones to fine sandstone-dolostones deposited in littoral ...
Xiao-ming Zhao, Xiao-fei Qiu, Zhi-hui An, Nian-wen Wu, Li Tian, Yun-xu Wei, Tuo Jiang   +6 more
doaj   +1 more source

A relational database of global U–Pb ages

Geoscience Frontiers, 2018
Abstract Enhanced understanding of how sampling techniques affect estimates of the global U–Pb age-distribution have, in turn, constrained U–Pb database design. Recent studies indicate that each continent has a unique age-distribution, as determined by zircon ages dated by the U–Pb isotope method.
openaire   +1 more source

Laser ablation MC-ICPMS U-Th and U-Th-Pb dating of Quaternary zircons from Jeju Island, Korea

Journal of Analytical Science and Technology
Background Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) emerged in the mid-1980s and rapidly became a crucial dating tool. The advent of femtosecond LA systems has substantially reduced volatility-dependent mass fractionation ...
Youn-Joong Jeong, Min-Ji Jung, Ung-San Ahn, Albert Chang-sik Cheong   +3 more
doaj   +1 more source

Monazite and Cassiterite Dating and Pyrite S Isotopes of the Helukou Tungsten-Tin Polymetallic Deposit of the Guposhan Ore District, Nanling Range: Implications for Ore Genesis

Geosciences
The Guposh an orefield within the western segment of the Nanling Range hosts a globally significant tungsten and tin metallogenic province whose formation is tied to the intense Middle Jurassic granitic magmatism. Nonetheless, critical ambiguities remain
Ying’ai Zhou, Yiping Chen, Lujun Peng, Dezhen Zou, Jinlun Cai, Hao Lei, Jingya Cao   +6 more
doaj   +1 more source