Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Hf-isotopes"”.
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The use of Hf-isotopes and high field strength elements to constrain magmatic processes and magma sources
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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Paleogeography of Western North America: Insights from Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry
… techniques including U-Pb geochronology and Hf isotope geochemistry of detrital zircons, as well as, geologic mapping and paleocurrent analysis. The Neoproterozoic through Pennsylvanian Yukon-Tanana terrane (YTTs) in the Coast Mountains of southeastern Alaska, the Cretaceous through Eocene …
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Measurement and analysis of the resolved resonance cross sections of the natural hafnium isotopes
… section parameters for the six natural hafnium isotopes. Cross section measurements, supported by the NUDAME and EUFRAT projects, were performed at the IRMM Geel GELINA time-of-flight facility. Capture experiments were conducted on the 12 m, 28 m and 58 m flight paths using C\(_6\)D\(_6\) …
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Geochemical Insights into Crustal Melting in the Bhutan Himalaya
… currently appears unique to Bhutan. O, U-Pb, Hf isotopes in zircon confirm previous whole-rock findings that melting in the eastern Himalaya took place over 20 Myr, from 31 to 11 Ma. Increasingly radiogenic Nd and Hf isotope signatures are observed in younger leucogranites, which suggest a …
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The Global Detrital Zircon Database: Quantifying the Timing and Rate of Crustal Growth
… host sediment and for modern river sediments. Hf isotope model ages were also incorporated into the database where grains were dated with both U-Pb and Hf isotopes. The Hf isotope model ages suggest that the majority of detrital zircons U-Pb ages reflect crustal recycling events that generated …
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MULTISCALE GEOCHEMICAL STUDY OF THE CORNO ALTO COMPLEX (ADAMELLO BATHOLITH)
… zircon domains have significantly distinct Hf isotopes (up to 18 ƐHf units of variation) with some values trending towards the isotopic composition of the depleted mantle (DM). The evidence of multiple components in the petrogenesis of the Corno Alto is also supported by the occurrence of …
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AN IMBRICATE MID CRUSTAL SUTURE ZONE: THE MOJAVE-YAVAPAI PROVINCE BOUNDARY IN GRAND CANYON, ARIZONA
… remains uncertain. This paper analyzes the U-Pb-Hf isotopic composition of zircons from both the oldest plutons and metasedimentary rocks in Grand Canyon. My results show that the Vishnu Schist does not support suturing. Paradoxically, plutons east and west of the Crystal shear zone support …
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The Mesoproterozoic Hallandian event - a region-scale orogenic event in the Fennoscandian Shield
The Sveconorwegian Province occupies the southwestern part of the Fennoscandian Shield. The easternmost tectonic unit of the Province is the 1710-1660 Ma parautochthonous Eastern Segment, which bears the imprint of at least two metamorphic events; the 1460-1380 Ma Hallandian and the 1150-970 Ma …