Results 21 to 30 of about 1,306 (162)

Discordance dating: A new approach for dating alteration events [PDF]

Geochronology
Zircon is the premier geochronometer used to date igneous and metamorphic processes, constrain sediment provenance models, and monitor key events in Earth history such as the growth of continents and the evolution of the biosphere.
J. R. Reimink, R. Beckman, E. Schoonover, M. Lloyd, J. Garber, J. H. F. L. Davies, A. Cerminaro, A. Cerminaro, M. G. Perrot, M. G. Perrot, A. Smye   +10 more
doaj   +1 more source

New identification and significance of Early Cretaceous mafic rocks in the interior South China Block

Scientific Reports, 2021
Early Cretaceous mafic rocks are first reported in the northern Guangxi region from the western Qin-Hang belt in the interior South China Block. A systematic investigation of zircon U–Pb dating, whole-rock geochemistry, Sm–Nd isotopes and zircon Hf–O ...
Hui-Min Su, Shao-Yong Jiang, Jia-Bin Shao, Dong-Yang Zhang, Xiang-Ke Wu, Xi-Qiang Huang   +5 more
doaj   +1 more source

U-Pb (LA-ICPMS) zircon ages and Nd isotopes for granitoids of the Tamboril-Santa Quitéria Complex, Ceará Central Domain: implication for neoproterozoic syncollisional magmatism in north Borborema Province [PDF]

Geologia USP. Série Científica, 2013
The Tamboril-Santa Quitéria Complex (TSQC) is one of the largest Neoproterozoic plutonic manifestations in the northBorborema Province (NE Brazil). It represents an anatectic/igneous association characterized by a number of magmaticpulses that occurred ...
Felipe Grandjean da Costa, Carlos Eduardo Ganade de Araújo, Wagner da Silva Amaral, Antonio Maurilio Vasconcelos, Joseneusa Brilhante Rodrigues   +4 more
doaj   +1 more source

Provenance and tectonic setting of Paleogene sandstone in the center of the northern Qaidam Basin, China

Journal of Natural Gas Geoscience, 2020
The average thickness of Paleogene sandstones reaches about 3000 m or even 4000 m at the northern margin of the Qaidam Basin. However, the provenance of these sandstones has been uncertain; thus, more comprehensive research is needed. Integrated research
Guoqiang Sun, Yetong Wang, Yun Jiang, Shile Pan, Shuncun Zhang, Mingfeng Zhang   +5 more
doaj   +1 more source

Simultaneous Determination of U-Pb Age and Trace Elements of Zircon by Laser Ablation Sector Field Inductively Coupled Plasma-Mass Spectrometry

Yankuang ceshi
Laser ablation sector field inductively coupled plasma-mass spectrometry (LA-SF-ICP-MS) is widely applied in U-Pb dating of zircon due to its remarkable sensitivity.
Linghao ZHAO, Dongyang SUN, Mingyue HU, Jihai YUAN, Chenzi FAN, Xiuchun ZHAN   +5 more
doaj   +1 more source

A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating

Geologica Acta, 2006
The Miranda do Douro orthogneiss was believed to be the oldest magmatic rock of the Central Iberian Zone, on the base of a U-Pb discordia upper intercept of 618 ± 9 Ma.
F. BEA, P. MONTERO, C. TALAVERA, T. ZINGER   +3 more
doaj   +1 more source

SHRIMP Zircon U-Pb Dating of Mid-Pleistocene Dacite and Discussion of Relative Problems

Yankuang ceshi, 2015
K-Ar and U series disequilibria methods have been applied to geochronology research of young volcanic rocks in Tengchong, China. Previous K-Ar dating methods yielded ages of 0.013 to 17.84 Ma and isochron ages of 0.13 to 2.9 Ma in this area. The U series
LI Lin-lin, WANG Shu-bing, SHI Yu-ruo
doaj   +1 more source

U–Pb zircon ages of the host rocks of the Juomasuo Au–Co–Cu deposit, northeastern Finland [PDF]

Bulletin of the Geological Society of Finland, 2017
The Salittu Formation is one of the few metavolcanic successions in the U-Pb zircon single grain dating using the LA-MC-ICP-MS technique was utilized to determine the age of the host rocks of the Juomasuo Au-Co-Cu deposit located in the late Archean ...
P. Nikkola, I. Mänttäri, O.T. Rämö
doaj   +1 more source

AGE OF THE KINTEREP FORMATION OF THE NORTHWESTERN SALAIR: CHEMOSTRATIGRAPHY AND U-Pb ZIRCON DATING

Геодинамика и тектонофизика, 2022
A comprehensive study of the stratotype section of the Kinterep formation of the North-Western Salair was carried out, including geochemical and isotope (Sr, C, O) studies of carbonate rocks, and U-Pb dating (LA-ICP-MS) of igneous zircon crystals from ...
N. I. Vetrova, E. V. Vetrov, E. F. Letnikova, N. G. Soloshenko   +3 more
doaj   +1 more source

New craniodental materials of Falcarius utahensis (Theropoda: Therizinosauria) reveal patterns of intraspecific variation and cranial evolution in early coelurosaurians

The Anatomical Record, EarlyView.
Abstract Despite documented ecomorphological shifts toward an herbivorous diet in several coelurosaurian lineages, the evolutionary tempo and mode of these changes remain poorly understood, hampered by sparse cranial materials for early representatives of major clades. This is particularly true for Therizinosauria, with representative crania best known
William J. Freimuth, Lindsay E. Zanno
wiley   +1 more source