This zircon thus represents the earliest evidence for continental crust and oceans on the earth. How faithfully do the geochronological and geochemical. Upb detrital zircon geochronology and provenance of the. Detrital zircon ages from southern norway springerlink. 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. Detrital zircon grains of the sedimentary rocks from the yunmengshan fm.
The upb ages of detrital zircon range from 3078 to 30 ma, suggesting that sediment input is derived from multiple sources. Analyzing detrital zircon datasets can be useful in many ways, including. A total of 1642 detrital zircon grains with unbroken crystal. How should corerim detrital zircon ages be reported in a. The zircon ages indicate that the geste formation was derived from nearby highrelief ranges composed of ordovician metasedimentary rocks. Global compilation of radiometrically dated detrital zircon. The download provides an empty database it does not include data previously captured by the author. 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. As illustrated in table 1, other attempts to construct global zircon databases. Upb detrital zircon geochronology and provenance of the tertiary kootznahoo formation, southeastern alaska.
This database provides a reference block for provenance analysis by future detrital zircon. Resolving the architecture and early evolution of a. Detrital zircon doubledating of forearc basin strata reveals magmatic, exhumational. Published detrital zircon geochronological data was compiled to form the global detrital zircon database gdzdb. Record of earlymiddle jurassic arc volcanism and transition to crustal extension. Detrital zircon provenance analysis of the great valley. A new method for evaluating age distributions of detrital. Software for evaluation of data distributions in u. Pdf detrital zircon geochronology and provenance of the. 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.
Detrital zircon ages and heavy mineral composition along the gulf of tonkin. Detrital zircon geochronology for neoproterozoic to cambrian sediment sources of the deep creek range and the pilot range in the southwestern united states. Detrital zircons are extracted from bulk sample using heavy liquid and frantz magnetic separation. 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 sediment yields and erosion rates under the assumption that age spectra broadly reflect the proportions of areal exposures of source rocks. Detrital zircon upb ages of sandstones in continental red. Detrital zircon provenance of mesoproterozoic to cambrian. Upb ages are collected from individual zircon grains, using laser ablation. 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.
Detrital zircon provenance of the pipe formation, ospwagan. Constraints on mountain building in the northeastern tibet. Results from the zircon reference set offset plot experiment gehrels. Gsa publications data repository 2019 geological society of. The majority of the data were collected in reconnaissance mode six isotopes per four scans. The latest version of the database includes over 284,000 single age determinations from upb dating of detrital zircons. Sedimentary provenance and maximum depositional age. Detrital zircon ages of neoproterozoic sequences of the. The composition of singlegrain detrital zircons is an effective provenance indicator of loess, and sheds new light on dust formation and transportation.
Lithofacies control in detrital zircon provenance studies. 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. Cirdles is creating cyber infrastructure for geochronology in an interdisciplinary collaboration among our software engineers and geochemists from two nsfsupported initiatives, earthtime and. A sedimentary record of coast mountains exhumation nathan evenson senior integrative. The detrital zircon age frequency distribution for this formation was strongly unimodal with a peak at 400450 ma and a paucity of grenvilleage zircons. These zircons represent 5,600 detrital zircon age frequency distributions. To promote compatibility with other software, detritalpy includes the option. While sandstone petrography continues to provide unique information about provenance, more recently, detritalzircon geochronology has evolved as the choice for provenance studies. 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. 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.
Evaporite deposition in the midneoproterozoic as a driver for changes in. Detrital zircons as tracers of sedimentary provenance. Most sampling sites for zircon upb analyses are selected to address local. The use of databases and gis software were essential for. Gsa data repository 2019154 supplementary table dr1.
If one has a detrital zircon with a core age of 1100 ma and a rim age of 400 ma and one wanted to construct one of the many graphs for visualizing such data e. Detrital zircon geochronology for neoproterozoic to. 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. In order to provide a comprehensive data set, we combined eight new detrital zircon ages from this area together with previously published data. 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. The detrital zircon upb age data available in the database july 2019 are summarised in fig. Quantitative estimation of the contribution of dust.
In light of the above, the linkage of detrital zircon upb ages of sedimentary. Statistical analyses of global upb database 2017 sciencedirect. Here we present a new technique for analyzing detrital zircon populations that uses all upb analyses, independent of. 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. Vermeesch visualisation and comparison of detrital age distributions part1. These data are now available from the web version of dateview, which is available from the database page of this site. Evidence from detrital zircons for the existence of continental crust and oceans on the earth 4. Geochron is a global database that hosts geochronologic and thermochronologic information from detrital minerals. Morphology of detrital zircon as a fingerprint to trace sediment provenance. 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. Methods and application of using detrital zircons to trace. Upb detrital zircon constraints on the depositional age and provenance of the. Detrital zircon geochronology of cordilleran retroarc. Abstract detrital geochronology and thermochronology have.
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. The improved resolution of sediment provenance from detrital zircon analysis of great valley stratigraphy enables recognition of previously undocumented arc magmatism and the evolution of regional. A detrital zircon transect across the son valley sector of. Pdf morphology of detrital zircon as a fingerprint to. Detrital zircon upb ages and luhf compositions fail the test of paleogeographic uniqueness, which is a prerequisite for using this tool to distinguish laurentian from baltican provenance, and. A total of 32,328 individual detrital zircon grain analysis have been compiled from 371 samples, as described in 36 different publications. A relational database of global upb ages sciencedirect. Results from the data processing software comparison jackson coming soon. Detrital zircon geochronology and sandstone provenance of basement waipapa terrane triassiccretaceous and cretaceous cover rocks northland allochthon and houhora complex in.