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MARIN 1. Repeated analyses of fragments of Durango fluorapatite crystals yields an average age of This overlaps the long-term average of Durango fluorapatite measured in laboratories worldwide. The analysis of multiple single apatite crystals of a Precambrian basement sample from Serra do Mar, southeastern Brazil, yields an average He age The non-uniform distribution of the parent elements can affect diffusive He loss by modifying the spatial distribution of He concentration in crystal e. Variation in the extent of radiation damage and grain size can cause dispersion of ages of single minerals from the same rock. The accumulation of radiation damage in apatite crystals has been shown to impede He diffusion, such that single apatite crystals with higher parent element concentrations have higher closure temperatures and record older ages e. Larger apatite crystals have a greater effective diffusion dimension and therefore retain a higher proportion of the radiogenic He than smaller apatite Farley

Geochronology and thermochronology on detrital material provides unique constraints on sedimentary provenance, depositional ages, and orogenic evolution of source terrains. Typically these ages correspond to crystallization and exhumation or eruption ages, and their combination can be used to more confidently resolve candidate source terrains, establish maximum depositional ages, and constrain the thermal histories of orogenic source regions. We present examples from Mesozoic aeolian sandstones, both modern and Paleogene fluvial sediments, and active margin turbidite assemblages from the Cascadia and Kamchatka margins. Important results include the fact that detritus from ancient orogens may dominate sediments thousands of kilometers away, crustal melting and exhumation appear to be spatially-temporally decoupled in at least two orogens, and first-cycle volcanic zircons older than depositional age are surprisingly rare in most settings except in the continental interior. In the case of the Kamchatkan, and possibly Olympic, turbidites, zircon He ages are partially reset. User Name Password Sign In. Abstract Geochronology and thermochronology on detrital material provides unique constraints on sedimentary provenance, depositional ages, and orogenic evolution of source terrains.

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Based on a study of pyrite from the Uzelga Cu-Zn volcanogenic massive sulfide VMS deposit South Urals the age of ore mineralization was first determined with the direct age-dating method, based on the fraction of radiogenic helium, incorporated into the pyrite crystal lattice from submicron inclusions of U and Th minerals. Author for correspondence. Petersburg, ISSN Print. User Username Password Remember me Forgot password? Notifications View Subscribe.

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The method is based on the accumulation of helium atoms produced by the alpha decay of U, Th, and in some cases Sm isotopes. These early helium dates had perhaps the greatest intellectual impact of any ages ever measured. They provided independent and quantitative evidence for the great antiquity of rocks, thus establishing a modern framework for understanding Earth history and, of particular importance,

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