scholarly journals Detrital zircon U–Pb geochronology, trace-element and Hf isotope geochemistry of the metasedimentary rocks in the Eastern Himalayan syntaxis: Tectonic and paleogeographic implications

2017 ◽  
Vol 41 ◽  
pp. 207-221 ◽  
Author(s):  
Liang Guo ◽  
Hong-Fei Zhang ◽  
Nigel Harris ◽  
Wang-Chun Xu ◽  
Fa-Bin Pan
Keyword(s):  
Trace Element ◽  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Metasedimentary Rocks ◽  
Eastern Himalayan Syntaxis

scholarly journals U–Pb Age and Hf Isotope Geochemistry of Detrital Zircons from Cambrian Sandstones of the Severnaya Zemlya Archipelago and Northern Taimyr (Russian High Arctic)

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 36 ◽  
Author(s):  
Victoria B. Ershova ◽  
Andrei V. Prokopiev ◽  
Andrey K. Khudoley ◽  
Tom Andersen ◽  
Kåre Kullerud ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
High Arctic ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Magmatic Arc ◽  
Novaya Zemlya ◽  
Late Neoproterozoic ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago

U–Pb and Lu–Hf isotope analyses of detrital zircons collected from metasedimentary rocks from the southern part of Kara Terrane (northern Taimyr and Severnaya Zemlya archipelago) provide vital information about the paleogeographic and tectonic evolution of the Russian High Arctic. The detrital zircon signatures of the seven dated samples are very similar, suggesting a common provenance for the clastic detritus. The majority of the dated grains belong to the late Neoproterozoic to Cambrian ages, which suggests the maximum depositional age of the enclosing sedimentary units to be Cambrian. The εHf(t) values indicate that juvenile magma mixed with evolved continental crust and the zircons crystallized within a continental magmatic arc setting. Our data strongly suggest that the main provenance for the studied clastics was located within the Timanian Orogen. A review of the available detrital zircon ages from late Neoproterozoic to Cambrian strata across the wider Arctic strongly suggests that Kara Terrane, Novaya Zemlya, Seward Peninsula (Arctic Alaska), Alexander Terrane, De Long Islands, and Scandinavian Caledonides all formed a single tectonic domain during the Cambrian age, with clastics predominantly sourced from the Timanian Orogen.

scholarly journals Preferential dissolution of uranium-rich zircon can bias the hafnium isotope compositions of granites

Geology ◽  
2021 ◽  
Author(s):  
Peng Gao ◽  
Chris Yakymchuk ◽  
Jian Zhang ◽  
Changqing Yin ◽  
Jiahui Qian ◽  
...  
Keyword(s):  
Low Temperature ◽  
Trace Element ◽  
Partial Melting ◽  
Hf Isotope ◽  
Geochemical Data ◽  
Metasedimentary Rocks ◽  
Higher Temperature ◽  
Isotope Analyses ◽  
Preferential Dissolution ◽  
Temperature Melting

Hafnium (Hf) isotopes in zircon are important tracers of granite petrogenesis and continental crust evolution. However, zircon in granites generally shows large Hf isotope variations, and the reasons for this are debated. We applied U-Pb geochronology, trace-element, and Hf isotope analyses of zircon from the Miocene Himalayan granites to address this issue. Autocrystic zircon had εHf values (at 20 Ma) of –12.0 to –4.3 (median = –9). Inherited zircon yielded εHf values (at 20 Ma) of –34.8 to +0.3 (median = –13); the majority of εHf values were lower than those of autocrystic zircon. The εHf values of inherited zircon with high U concentrations resembled those of autocrystic zircon. Geochemical data indicates that the granites were generated during relatively low-temperature (<800 °C) partial melting of metasedimentary rocks, which, coupled with kinetic hindrance, may have led to the preferential dissolution of high-U zircon that could dissolve more efficiently into anatectic melt due to higher amounts of radiation damage. Consequently, Hf values of autocrystic zircon can be biased toward the values of U-rich zircon in the source. By contrast, literature data indicate that granites generated at high temperatures (<820–850 °C) generally contain autocrystic and inherited zircons with comparable Hf isotope values. During higher-temperature melting, indiscriminate dissolution of source zircon until saturation is reached will result in near-complete inheritance of Hf isotope ratios from the source. Our results impose an extra layer of complexity to interpretation of the zircon Hf isotope archive that is not currently considered.

scholarly journals Supplemental material: Detrital zircon U-Pb geochronology and Hf isotope geochemistry of Paleozoic and Triassic passive margin strata of western North America

2013 ◽  
Author(s):  
George Gehrels ◽  
Mark Pecha
Keyword(s):  
North America ◽  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Passive Margin ◽  
Western North America ◽  
File Size ◽  
Image File ◽  
Supplemental File

Geosphere, February 2014, v. 10, p. 49-65, doi:10.1130/GES00889.1, Supplemental File 2 - CL image file (238 pages). File size is ~23 MB.

scholarly journals Supplemental material: Detrital zircon U-Pb geochronology and Hf isotope geochemistry of Paleozoic and Triassic passive margin strata of western North America

2013 ◽  
Author(s):  
George Gehrels ◽  
Mark Pecha
Keyword(s):  
British Columbia ◽  
North America ◽  
Detrital Zircon ◽  
Southern California ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Passive Margin ◽  
Western North America ◽  
Standard Data ◽  
Data Table

Geosphere, February 2014, v. 10, p. 49-65, doi:10.1130/GES00889.1, Supplemental Tables - Zipped file containing 13 Excel table files. Table 1: Alaska U-Pb data. Table 2: Northern British Columbia U-Pb data. Table 3: Southern British Columbia U-Pb data. Table 4: Nevada-Utah U-Pb data. Table 5: Southern California U-Pb data. Table 6: Sonora U-Pb data. Table 7: Hf standard data. Table 8: Alaska Hf data. Table 9: Northern British Columbia Hf data. Table 10: Southern British Columbia Hf data. Table 11: Nevada-Utah Hf data. Table 12: Southern California Hf data. Table 13: Sonora Hf data.

scholarly journals Petrology, Trace Element and Sr, Nd, Hf Isotope Geochemistry of the North Lanzo Peridotite Massif (Western Alps, Italy)

2012 ◽  
Vol 53 (11) ◽  
pp. 2259-2306 ◽  
Author(s):  
Luisa Guarnieri ◽  
Eizo Nakamura ◽  
Giovanni B. Piccardo ◽  
Chie Sakaguchi ◽  
Nobumichi Shimizu ◽  
...  
Keyword(s):  
Trace Element ◽  
Isotope Geochemistry ◽  
Western Alps ◽  
Hf Isotope ◽  
The North
Sign in / Sign up

Export Citation Format

Share Document