Results 51 to 60 of about 1,938 (228)

Zircon Hf isotope of Iranian porphyry copper deposits: Constraints on the source of porphyry Cu magma [PDF]

پترولوژی, 2016
In this research, zircon Hf isotopic ratios from Sungun, Sar Cheshmeh, Meiduk, Darreh Zar and Bondar Hoza porphyry mineralized intrusions has been studied.
Mehraj Aghazadeh
doaj  

Low δ18O zircon grains in the Neoarchean Rum Jungle Complex, northern Australia: An indicator of emergent continental crust

, 2014
The timing of widespread continental emergence is generally considered to have had a dramatic effect on the hydrological cycle, atmospheric conditions, and climate.
Cross, A.J., Hollis, J., van Kranendonk, M.J., Kirkland, Chris, Armstrong, R.A., Allen, C., Kirkland, C.L., Cross, A., Hollis, J.A., Armstrong, R., Allen, C.M.   +10 more
core   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source

The 3.5 Ga Siurua trondhjemite gneiss in the Archaean Pudasjärvi Granulite Belt, northern Finland [PDF]

Bulletin of the Geological Society of Finland, 2003
In the Archaean Pudasjärvi Complex the pyroxene-bearing rocks are considered to form a belt, the Pudasjärvi Granulite Belt (PGB). The major rock types of the PGB are meta-igneous mafic and felsic granulites, and trondhjemite gneisses Red alaskites, white
T. Mutanen, H. Huhma
doaj   +1 more source

Some observations on the use of zircon U-Pb geochronology in the study of granitic rocks

, 1992
In situ, microscale, U-Pb isotopic analyses of zircon using the SHRIMP ion microprobe demonstrate both the potential and the limitations of zircon U-Pb geochronology. Most zircons, whether from igneous or metamorphic rocks, need to be considered as mixed
Ian S. Williams
core   +1 more source

Reidite Formation From Zircon Subjected to 20, 40, and 60 GPa Shock Experiments

Journal of Raman Spectroscopy, EarlyView.
Structure disordering as a result of shock pressure: In zircon shocked from 20 to 60 GPa, the shock‐induced structural disorder increases with increasing shock pressure (gray area). Shock disorder of zircon is an integral part of its transformation to reidite: Reidite occurs after amorphous material.
Dmitry A. Zamyatin, Elizaveta Kovaleva
wiley   +1 more source

Metamorphism and geochronology of the spinel−cordierite granulite in the Mirror Peninsula, East Antarctica

Dizhi lixue xuebao, 2023
Objective  The Prydz Bay belt in East Antarctica recorded two significant tectono-thermal events, the Grenvillian event and the Pan-African event, which are considered to be closely related to the evolution of the Rodinia and Gondwana supercontinents ...
LIU Xinshu, WANG Wei-(RZ), BAO Hong, GONG Tingnan, ZHAN Liqing, LIU Xiaochun, ZHAO Yue   +6 more
doaj   +1 more source

Tables S1 and S2: Lower crustal hot zones as zircon incubators? Inherited zircon antecrysts in diorites from a mafic mush reservoir

, 2023
Method: U–Pb in zircon (Table S1) and Method: Hf isotopes in zircon (Table ...
Hoseong Lim (14318490), Yona Nebel-Jacobsen (9548182), Jongkyu Park (4230034), Peter A. Cawood (2842526), Bora Myeong (14318496), Oliver Nebel (9548179), Roberto F. Weinberg (8869376), Vitor R. Barrote (14318493)   +7 more
core   +2 more sources

Automated particle analysis of D.B. Cooper's tie

Journal of Forensic Sciences, EarlyView.
Abstract Automated particle analysis (APA) using scanning electron microscopy (SEM) and energy‐dispersive x‐ray spectrometry (EDS) is a well‐known method in forensics, especially as it is applied to gunshot residue analysis. Here we describe the analysis of particles lifted from D.B. Cooper's tie, which was left on the hijacked plane in 1971.
Thomas G. Kaye, Kent L. Rhodes
wiley   +1 more source

U-Pb geochronology and Hf isotopes of the Grenvillian Río Hondo gneisses, Puebla: redefining the western edge of Oaxaquia

Revista Mexicana de Ciencias Geológicas
In situ Río Hondo (Puebla, southern Mexico) gneiss samples, as well as clastic samples recovered from the nearby-outcropping latest Paleozoic Matzitzi Formation, a fluvial unit mainly sourced by Grenvillian rocks,  were historically interpreted as ...
Luigi A. Solari, Mariano Elías Herrera, Guillermo Espejo-Bautista, Mariana Jaramillo-Jaramillo, María del Consuelo Macías Romo, Carlos Ortega-Obregón   +5 more
doaj   +1 more source