A 493488 ma detrital zircon age peak is also found in upper cambrian sandstones from the sauk iiiii boundary in the wind river canyon on the wyoming craton, the melrose area of the southwest. This zircon thus represents the earliest evidence for continental crust and oceans on the earth. Results from the zircon reference set offset plot experiment gehrels. The use of databases and gis software were essential for. Upb detrital zircon geochronology and provenance of the tertiary kootznahoo formation, southeastern alaska. Upb detrital zircon geochronology and provenance of the. Read detrital zircon provenance of the mesoproterozoic midcontinent rift, lake superior region, u. Results from the data processing software comparison jackson coming soon. Vermeesch visualisation and comparison of detrital age distributions part1. Detrital zircon ages and heavy mineral composition along the gulf of tonkin. Detrital zircons as tracers of sedimentary provenance. Detrital zircon dating from neoproterozoic successions in the sirwa inlier of the antiatlas belt in morocco confirms that the maximum depositional age of the main stratigraphic groups is significantly. One resorbed, inner zircon core in a detrital grain is strongly discordant and gives a composite inner coremagmatic outer core 207pb206pb age of 2383 ma. In order to provide a comprehensive data set, we combined eight new detrital zircon ages from this area together with previously published data.
Most sampling sites for zircon upb analyses are selected to address local. In this case the proximity of points within a set refers to a graphical representation of the degree of similarity of detrital zircon age spectra between defined continental regionswithin any particular age bin. Detrital zircon geochronology of cordilleran retroarc foreland basin strata, western north america andrew k. Upb isotopic dating of detrital zircon from supracrustal proterozoic and cambrian arenites from the western united states and northern mexico reveal three main age groups, 1. Detrital zircon provenance analysis of the great valley. These zircons represent 5,600 detrital zircon age frequency distributions. The upb age distributions of zircons from granitoids and detrital zircons from. Geochemistry and detrital zircon records of the ruyang. Comparison of the dry fork sample to published east coast data and to the north american record from the gdzdb illustrate the unusual nature of the dry fork formation sample. In light of the above, the linkage of detrital zircon upb ages of sedimentary. Detrital zircon geochronology for neoproterozoic to cambrian sediment sources of the deep creek range and the pilot range in the southwestern united states. The detrital zircon age frequency distribution for this formation was strongly unimodal with a peak at 400450 ma and a paucity of grenvilleage zircons. The latest version of the database includes over 284,000 single age determinations from upb dating of detrital zircons.
Cirdles is creating cyber infrastructure for geochronology in an interdisciplinary collaboration among our software engineers and geochemists from two nsfsupported initiatives, earthtime and. The composition of singlegrain detrital zircons is an effective provenance indicator of loess, and sheds new light on dust formation and transportation. These data are now available from the web version of dateview, which is available from the database page of this site. Pdf morphology of detrital zircon as a fingerprint to. Detrital zircon provenance of mesoproterozoic to cambrian. Global compilation of radiometrically dated detrital zircon. A detrital zircon transect across the son valley sector of. Detrital zircon ages from southern norway springerlink. Methods and application of using detrital zircons to trace. This database provides a reference block for provenance analysis by future detrital zircon. Analyzing detrital zircon datasets can be useful in many ways, including. Detrital zircon geochronology and sandstone provenance of basement waipapa terrane triassiccretaceous and cretaceous cover rocks northland allochthon and houhora complex in. A total of 32,328 individual detrital zircon grain analysis have been compiled from 371 samples, as described in 36 different publications.
While matching detritalzircon age populations with crystallization ages of potential sources of sediment provides a nonunique identification of the possible provenance, critical analysis of dispersal systems seems to have lagged behind and is a clearly essential next step for provenance studies. The upb ages of detrital zircon range from 3078 to 30 ma, suggesting that sediment input is derived from multiple sources. A total of 1642 detrital zircon grains with unbroken crystal. Read detrital zircon ages of neoproterozoic sequences of the moroccan antiatlas belt, precambrian research on deepdyve, the largest online rental service for scholarly research with. Statistical analyses of global upb database 2017 sciencedirect. Detrital zircon geochronology of cordilleran retroarc. Upb detrital zircon constraints on the depositional age and provenance of the. How should corerim detrital zircon ages be reported in a. Discordant ages contain important information regarding the history of a detrital zircon population, for example the timing of pbloss or metamorphism, and removing these analyses may significantly bias a zircon dataset. Lithofacies control in detrital zircon provenance studies.
Detrital zircons are extracted from bulk sample using heavy liquid and frantz magnetic separation. As illustrated in table 1, other attempts to construct global zircon databases. Detrital zircon grains of the sedimentary rocks from the yunmengshan fm. A sedimentary record of coast mountains exhumation nathan evenson senior integrative. Resolving the architecture and early evolution of a.
Detrital zircon doubledating of forearc basin strata reveals magmatic, exhumational. Detrital zircon provenance of the pipe formation, ospwagan. First, the absence of any detrital zircon grains from the north qilian shan in the pre16 ma strata is the most remarkable contrast in the detrital zircon age distributions fig. Evidence from detrital zircons for the existence of. Constraints on mountain building in the northeastern tibet. The download provides an empty database it does not include data previously captured by the author. Discordant ages contain important information regarding the history of a detrital zircon population, for example the timing of pbloss or metamorphism, and removing these analyses may significantly bias a. Published detrital zircon geochronological data was compiled to form the global detrital zircon database gdzdb. Gsa data repository 2019154 supplementary table dr1. The zircon ages indicate that the geste formation was derived from nearby highrelief ranges composed of ordovician metasedimentary rocks. Upb ages are collected from individual zircon grains, using laser ablation. The majority of the data were collected in reconnaissance mode six isotopes per four scans. Detrital geochronology, generally focused on zircon only, is widely used not only to obtain qualitative information on source areas but also in quantitative provenance analysis aimed at calculating.
The detrital zircon upb age data available in the database july 2019 are summarised in fig. Pdf detrital zircon geochronology and provenance of the. Detrital zircon geochronology for neoproterozoic to. Abstract detrital geochronology and thermochronology have. A new method for evaluating age distributions of detrital. The detrital zircon upb geochronology of sedimentary rocks from the lower miocene to quaternary is examined in this study to investigate the temporal and spatial variations in provenance since the early miocene.
Detritalzircon geochronology and sedimentary provenance. Convergentmargin basins cmbs are commonly associated with active arcs, and hence are rich in detrital zircon dz whose ages closely reflect the timing of deposition. Software for evaluation of data distributions in u. It occurs as a common accessory mineral in igneous rocks as primary crystallization products, in metamorphic rocks and as detrital grains in sedimentary rocks. Sedimentary provenance and maximum depositional age. To promote compatibility with other software, detritalpy includes the option. Here we present a new technique for analyzing detrital zircon populations that uses all upb analyses, independent of. Gsa publications data repository 2019 geological society of. Detrital zircon upb ages of sandstones in continental red. Evaporite deposition in the midneoproterozoic as a driver for changes in. Geochron is a global database that hosts geochronologic and thermochronologic information from detrital minerals.
How faithfully do the geochronological and geochemical. Morphology of detrital zircon as a fingerprint to trace sediment provenance. While sandstone petrography continues to provide unique information about provenance, more recently, detritalzircon geochronology has evolved as the choice for provenance studies. This allowed analysis of a greater number of grains in a search. Quantitative estimation of the contribution of dust.
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