Results 81 to 90 of about 6,544,459 (237)

Correlated errors in U-Pb geochronology.

GEOCHEMICAL JOURNAL, 1979
Formulae are derived for the correlation of errors in the most used lead-lead and uranium-lead diagrams. It is emphasized that with the usual measurement schemes, error correlation is high in the conventional diagrams. An inverse lead-lead diagram is described in which, by proper choice of the measurement scheme, there is no correlation between errors.
openaire   +2 more sources

Изотопная геология древнейших образований Южного Урала

Литосфера, 2019
С помощью современных методов изотопной геологии в сочетании с петрологическими и структурными исследованиями изучены древнейшие полиметаморфические комплексы Южного Урала - Тараташский и Александровский, являющиеся уникальными объектами, в летописи ...

doaj  

Uso do chumbo em urina como indicador de exposição e sua relação com chumbo no sangue Use of urine lead level as an exposure indicator and its relationship to blood lead

Cadernos de Saúde Pública, 2008
O objetivo deste trabalho foi verificar se há correlação estatisticamente significativa entre as concentrações de chumbo no sangue (Pb-S) e urina (Pb-U).
Maria de Fátima Ramos Moreira, Eduardo Borba Neves   +1 more
doaj   +1 more source

LA-MC-ICP-MS dating of zircon from chromitite of the Archean Bangur Gabbro Complex, Orissa, India – Ambiguities and constraints

Geologica Acta, 2015
The Mesoarchean chromitites in the Singhbhum craton provide the main source of chromium in India. We report here results of dating zircon grains that were found in the chromitite of ultramafic rocks belonging to the southern part of the Archean Baula ...
P. V. SUNDER-RAJU, E. HANSKI, Y. LAHAYE
doaj  

EDADES U-Pb DEL BATOLITO ANTIOQUEÑO

Boletín de Ciencias de la Tierra, 2007
El batolito Antioqueño enclavado en el centro del departamento de Antioquia es por varias razones el cuerpo intrusivo más importante de la Cordillera Central colombiana. Cubre un área de casi 8000 km2 y se compone esencialmente de granodiorita y tonalita.   Análisis K-Ar en biotitas describen un intervalo de edades, entre 63 Ma y 90 Ma.
Ordóñez C., Oswaldo, Martins Pimentel, Marcio, Henrique Laux, Jorge   +2 more
openaire   +3 more sources

Appendix A: SIMS zircon U-Pb isotopic analysis of the Beiwu, Linong and Lunong intrusions

, 2011
Appendix A: SIMS zircon U-Pb isotopic analysis of the Beiwu, Linong and Lunong ...
Xian-wu, Bi, Chen Heng (7969622), Hu Rui-zhong (7969613), Zhong Hong (7969619), Zhu Jing-jing (7969610), Bi Xian-wu (7969616), Rui-zhong, Hu, Heng, Chen, Hong, Zhong, Jing-jing, Zhu   +9 more
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From subduction to collision in the northern Tibetan plateau : evidence from the early Silurian clastic rocks, northwestern China [PDF]

, 2012
The Qilian Orogen records early Paleozoic collisional suturing of the Qaidam Block and the Central Qilian Block to the North China Craton. The composition and U-Pb age of detrital zircons and the composition of Cr-spinels from the Early Silurian ...
Jianghai Yang, Peter A. Cawood, Yuansheng Du, Yajun Xu, Yang, Jianghai, Xu, Yajun, Cawood, Peter A., Du, Yuansheng   +7 more
core   +1 more source

U redox state tracked in mineralized hydrothermal carbonate with implications for U-Pb geochronology

Communications Earth & Environment
U-Pb carbonate geochronology can directly constrain the timing and rates of important geological processes. However, the mechanisms and controls on U incorporation, distribution, and retention in carbonate minerals remain unclear, limiting geological ...
Sarah Bowie, Catherine Mottram, E. Troy Rasbury, Paul Northrup, Ryan Tappero, Dawn Kellett   +5 more
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T-t Evolution of the Early Proterozoic Rocks in the Northern Ladoga Region from the Data on U-Pb, Rb-Sr and Sm-Nd Systems in Minerals

Геодинамика и тектонофизика
This paper presents the results of a study of isotopic systems in minerals and rocks in southern margin of the epi-Archean Karelian craton in the zone of its junction with the Svecofennian mobile belt.
Sh. K. Baltybaev, V. M. Savatenkov, M. E. Petrakova   +2 more
doaj   +1 more source

The results of U-Pb SHRIMP-II dating of zircon from granitoids of Talitsky molybdenum-bearing massif (eastern slope of the Middle Urals)

Литосфера, 2017
Age position and geodynamic conditions of molybdenum metallization and productive granitoids of the Urals formation are very little studied now. This publication contains the results of isotopic dating of granites from Talitsa Cu-Mo-porphyry deposit ...
N. Smirnov Vladimir, S. Ivanov Kirill, P. Shokalsky Sergey, L. Ronkin Yury   +3 more
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