Results 1 to 10 of about 7,236 (215)

U-Pb SHRIMP geochronology data from the eastern Central Kibalian Superterrane, Bomu-Kibalian Craton, northeastern DRC: Implications for the tectonic evolution of the Kilo Terrane [PDF]

Data in Brief, 2021
This brief presents new U-Pb SHRIMP (Sensitive High-Resolution Ion Microprobe) geochronology data on zircons and titanites dated from the gold-rich Kilo Terrane in the eastern Central Kibalian Superterrane, northeastern DRC. Out of 40 rock samples (Table
J.M. Kabete, N.J. McNaughton, A. Bashizi, B. Kiza   +3 more
doaj   +2 more sources

Examination of the accuracy of SHRIMP U–Pb geochronology based on samples dated by both SHRIMP and CA-TIMS [PDF]

Geochronology, 2023
Estimations of the reproducibility of U–Pb ages from SHRIMP (Sensitive High-Resolution Ion MicroProbe) instruments are based on data from studies that are nearly 2 decades old.
C. W. Magee Jr., S. Bodorkos, C. J. Lewis, J. L. Crowley, C. J. Wall, R. M. Friedman   +5 more
doaj   +3 more sources

Extreme isotopologue disequilibrium in molecular SIMS species during SHRIMP geochronology [PDF]

Geoscientific Instrumentation, Methods and Data Systems, 2017
The current limitation in the accuracy and precision of inter-element analysis in secondary ion mass spectrometry (SIMS) is the ability to find measurable quantities that allow relative differences in ionization and transmission efficiency of secondary
C. W. Magee Jr., C. W. Magee Jr., M. Danišík, T. Mernagh, T. Mernagh   +4 more
doaj   +4 more sources

Probing the ‘Zircon Zip’: Geochronology (FT and SHRIMP) [PDF]

ASEG Extended Abstracts, 2006
Zircon megacrysts are associated with gem ruby- sapphire deposits along a 12 000 km long zone, from eastern Australia in the south, through South East Asia, to far eastern Russia in the north. Representative zircons were studied from some 6 sites along this zone.
Ian Graham, Lin Sutherland, Richard Armstrong   +2 more
openaire   +1 more source

Resolving the timescales of magmatic and hydrothermal processes associated with porphyry deposit formation using zircon U–Pb petrochronology [PDF]

Geochronology, 2020
Understanding the formation of economically important porphyry Cu–Au deposits requires knowledge of the magmatic-to-hydrothermal processes that act within the much larger magmatic system and the timescales on which they occur.
S. J. E. Large, S. J. E. Large, J.-F. Wotzlaw, M. Guillong, A. von Quadt, C. A. Heinrich, C. A. Heinrich   +6 more
doaj   +1 more source

Sensitive High Resolution Ion Microprobe (SHRIMP IIe/MC) of the Institute of Geosciences of the University of São Paulo, Brazil: analytical method and first results [PDF]

Geologia USP. Série Científica, 2014
This paper presents the characteristics of the high resolution secondary ion mass spectrometer coupled with an Ion Micro - probe (SHRIMP IIe/MC), installed at the Institute of Geosciences of the University of São Paulo (IGc-USP), as well as the ...
Kei Sato, Colombo Celso Gaeta Tassinari, Miguel Angelo Stipp Basei, Oswaldo Siga Júnior, Artur Takashi Onoe, Artur Takashi Onoe, Maurício Dias de Souza   +6 more
doaj   +1 more source

Further SHRIMP geochronology on the early Cambrian of South China [PDF]

American Journal of Science, 2008
Zircon 206Pb/238U ages are reported for bentonites from two Cambrian sections in South China, the Meishucun and the Fandian. The analyzed zircons vary widely in age because of the presence of detrital and altered grains. Spot ages were corrected for calibration drift during analysis, and the age of reference zircon SL13 was calibrated as 580 Ma against
Compston, W., Zhang, Z., Cooper, J., Ma, G., Jenkins, R.   +4 more
openaire   +2 more sources

U-Pb SHRIMP zircon dating of Grenvillian metamorphism in Western Sierras Pampeanas (Argentina) : correlation with the Arequipa-Antofalla craton and constraints on the extent of the Precordillera Terrane [PDF]

, 2006
The Sierras Pampeanas of Argentina, the largest outcrop of pre-Andean crystalline basement in southern South America, resulted from plate interactions along the proto-Andean margin of Gondwana, from as early as Mesoproterozoic to Late Paleozoic times (e ...
C. Mark Fanning, Carlos W. Rapela, Carmen Galindo, Casquet, Casquet, Cesar Casquet, Corrievau, Damm, Edgardo Baldo, Galindo, Jose M. González-Casado, Juan A. Dahlquist, Kretz, Loewy, Martignole, McDonough, Pankhurst, Porcher, Powell, Ramos, Ramos, Ramos, Rapela, Rapela, Rivers, Robert J. Pankhurst, Thomas, Tosdal, Varela, Vavra, Vujovich, Wasteneys   +31 more
core   +6 more sources

Examination of SHRIMP U-Pb zircon geochronology accuracy from samples dated by both SHRIMP and CA-TIMS

, 2022
Abstract. Estimations of the reproducibility of U-Pb ages from SHRIMP instruments are based on data from studies nearly two decades old. Since that time, refinement of analytical procedures and manufacturing and installation improvements may have reduced the fundamental uncertainties of SHRIMP U-Pb analysis.
Charles Magee Jr., Simon Bodorkos, Christopher Lewis, James Crowley, Corey Wall, Richard Friedman   +5 more
openaire   +1 more source

An algorithm for U–Pb geochronology by secondary ion mass spectrometry [PDF]

Geochronology, 2022
Secondary ion mass spectrometry (SIMS) is a widely used technique for in situ U–Pb geochronology of accessory minerals. Existing algorithms for SIMS data reduction and error propagation make a number of simplifying assumptions that degrade the precision
P. Vermeesch
doaj   +1 more source