SHRIMP ion probe zircon geochronology and Sr and Nd isotope geochemistry for southern Longwood Range and Bluff Peninsula intrusive rocks of Southland, New Zealand [PDF]
, 2006 Permian–Jurassic ultramafic to felsic intrusive complexes at Bluff Peninsula and in the southern Longwood Range along the Southland coast represent a series of intraoceanic magmatic arcs with ages spanning a time interval of 110 m.y.
Ireland, Trevor R. +7 more
core +1 more source
Apatite: a U-Pb thermochronometer or geochronometer?
Lithos, 2018 Abstract Apatite is an accessory mineral that is frequently found in both igneous and clastic sedimentary rocks. It is conventionally considered to be characterized by a closure temperature range between 375 and 600 °C and hence has been employed to address mid-temperature thermochronology questions relevant to the reconstruction of thermal events in
Kirkland, C. L. +6 more
openaire +4 more sources
Uranium-Lead dating of hominid fossil sites in South Africa [PDF]
, 2005 Discoveries of hominid, or apeman, fossils in the twentieth century have brought human evolution into the scientific spotlight. It is important that ages are assigned to such hominids so that their place in human evolution can be established.
Walker, Joanne
core +5 more sources
Adjustment of small-span masonry arch bridges to present-day demands
Građevinar, 2014 An overview of deterioration mechanisms and damage to masonry arch bridges, methods for inspection of existing structures, and conservative and sophisticated assessment methods, is presented in this paper.
Alex Kindij +2 more
doaj +1 more source
Boletín de Ciencias de la Tierra, 2023 El Complejo Migmatítico de la Cocha-Río Téllez está localizado en el flanco oriental de los Andes Colombianos, entre los departamentos de Nariño y Putumayo. Aflora a manera de ventanas entre depósitos volcánicos y fluvio-volcánicos recientes.
Gabriel Rodríguez-García +1 more
doaj +1 more source
Modeling apparent Pb loss in zircon U–Pb geochronology [PDF]
GeochronologyThe loss of radiogenic Pb from zircon is known to be a major factor that can cause inaccuracy in the U–Pb geochronological system; hence, there is a need to better characterize the distribution of Pb loss in natural samples.
G. R. Sharman, M. A. Malkowski
doaj +1 more source
Detrital zircon geochronology of Paleoproterozoic metasedimentary rocks from Jämsä, Central Finland [PDF]
Bulletin of the Geological Society of FinlandIn this short communication, we present new detrital single grain zircon U-Pb data for six metasedimentary rock samples from Jämsä, Central Finland.
Perttu Mikkola +2 more
doaj +1 more source
NanoSIMS and EPMA dating of lunar zirconolite
Progress in Earth and Planetary Science, 2021 Zirconolite is a common Zr-rich accessary mineral in mafic rocks. It is also an ideal U–Pb/Pb–Pb chronometer because it commonly contains high U content (mostly 0.1–10 wt%) and negligible initial Pb.
Nian Wang +4 more
doaj +1 more source
Petrology and geochemistry of a U and Th enriched nephelinite from Mt. Nyiragongo, Zaire: Its bearing on ancient mantle metasomatism [PDF]
Bulletin of the Geological Society of Finland, 1985 Unusual large Pb isotope variations found by Vollmer and Norry (1983 a) in nephelinites from Nyiragongo and related volcanoes date a 500 Myr old U(Th)/Pb fractionation.
R. Vollmer, P.H. Nixon, E. Condliffe
doaj +1 more source
1.88 Ga granitoids at Sorsakoski, Central Finland: A-type magmatism within the Raahe-Ladoga suture zone [PDF]
Bulletin of the Geological Society of FinlandFour quartz monzonite – granite intrusions forming the Sorsakoski granite lithodeme, are found within the Raahe-Ladoga suture zone in Central Finland. The prevailing potassium feldspar megacrystic quartz monzonites and granites form a bimodal association
Perttu Mikkola +3 more
doaj +1 more source