scholarly journals Supplemental Material: Detrital zircon geothermochronology reveals pre-Alleghanian exhumation of regional Mississippian sediment sources in the southern Appalachian Valley and Ridge Province

2021 ◽  
Author(s):  
M. McKay ◽  
et al.
Keyword(s):  
Detrital Zircon ◽  
Sediment Sources ◽  
Southern Appalachian ◽  
Sample Set ◽  
Valley And Ridge Province ◽  
Green Box

<div>Figure 4 is interactive. Hover over each sample set (right) to see stacked on composition-age fields (left) (A) 250–500 Ma and (B) 800– 1200 Ma. Layers may be viewed separately or in combination using the capabilities of the Acrobat (PDF) layering function (click “Layers” icon along vertical bar on left side of window for display of available layers; turn layers on or off by clicking the box to the left of the layer name). Figure 5 is interactive. Hover over the Th/U>75 (black-red) box and Th/U<75 (green) box in the lower part of the figure to view subset KDEs of each sample. Layers may be viewed separately or in combination using the capabilities of the Acrobat (PDF) layering function (click “Layers” icon along vertical bar on left side of window for display of available layers; turn layers on or off by clicking the box to the left of the layer name).<br></div>

scholarly journals Supplemental Material: Detrital zircon geothermochronology reveals pre-Alleghanian exhumation of regional Mississippian sediment sources in the southern Appalachian Valley and Ridge Province

2021 ◽  
Author(s):  
M. McKay ◽  
et al.
Keyword(s):  
Detrital Zircon ◽  
Sediment Sources ◽  
Southern Appalachian ◽  
Sample Set ◽  
Valley And Ridge Province ◽  
Green Box

<div>Figure 4 is interactive. Hover over each sample set (right) to see stacked on composition-age fields (left) (A) 250–500 Ma and (B) 800– 1200 Ma. Layers may be viewed separately or in combination using the capabilities of the Acrobat (PDF) layering function (click “Layers” icon along vertical bar on left side of window for display of available layers; turn layers on or off by clicking the box to the left of the layer name). Figure 5 is interactive. Hover over the Th/U>75 (black-red) box and Th/U<75 (green) box in the lower part of the figure to view subset KDEs of each sample. Layers may be viewed separately or in combination using the capabilities of the Acrobat (PDF) layering function (click “Layers” icon along vertical bar on left side of window for display of available layers; turn layers on or off by clicking the box to the left of the layer name).<br></div>

Detrital zircon geochronology and sandstone provenance of basement Waipapa Terrane (Triassic–Cretaceous) and Cretaceous cover rocks (Northland Allochthon and Houhora Complex) in northern North Island, New Zealand

2012 ◽  
Vol 150 (1) ◽  
pp. 89-109 ◽  
Author(s):  
C. J. ADAMS ◽  
N. MORTIMER ◽  
H. J. CAMPBELL ◽  
W. L. GRIFFIN
Keyword(s):  
New Zealand ◽  
Detrital Zircon ◽  
Upper Cretaceous ◽  
Zircon Geochronology ◽  
Sediment Sources ◽  
Detrital Zircon Geochronology ◽  
Submarine Fans ◽  
Western Province ◽  
Sandstone Provenance ◽  
A Minor

AbstractDetrital zircon U–Pb ages are reported for 14 sandstones of mainly Cretaceous age from the Northland Allochthon, Houhora Complex and Waipapa Terrane of northern North Island, New Zealand. Results from the Waipapa Terrane samples, selected from sequences in the Bay of Plenty, Coromandel Peninsula and Great Barrier Island, show that deposition continued into late Early Cretaceous time and, as in the Torlesse Composite Terrane, finally waned at c. 110–114 Ma. Upper Lower Cretaceous and Upper Cretaceous sedimentary successions in the Houhora Complex and Northland Allochthon have dominant sediment sources derived from local, contemporary volcanism, with a minor older contribution from the Murihiku Terrane to the west. As in eastern North Island, upper Upper Cretaceous sandstones lack major Albian magmatic components and their sources are solely in the Murihiku Terrane, and possibly the Western Province. We propose a Cretaceous palaeogeographic model that invokes a recently extinct orogen and a partially submerged continental borderland, dissected by rivers supplying submarine fans.

The mid-Cretaceous transition from basement to cover within sedimentary rocks in eastern New Zealand: evidence from detrital zircon age patterns

2012 ◽  
Vol 150 (3) ◽  
pp. 455-478 ◽  
Author(s):  
CHRISTOPHER J. ADAMS ◽  
NICK MORTIMER ◽  
HAMISH J. CAMPBELL ◽  
WILLIAM L. GRIFFIN
Keyword(s):  
New Zealand ◽  
Detrital Zircon ◽  
Passive Margin ◽  
Accretionary Wedge ◽  
Sediment Sources ◽  
Eastern Province ◽  
Zircon Age ◽  
Source Areas ◽  
Western Province ◽  
Age Patterns

AbstractDetrital zircon U-Pb ages for 30 Late Jurassic and Cretaceous sandstones from the Eastern Province of eastern New Zealand, combined with previously-published geochronological and palaeontological data, constrain the time of deposition in the Pahau and Waioeka terranes of the Cretaceous accretionary margin of Zealandia, and their adjacent cover strata. The zircon age patterns also constrain possible sediment source areas and mid-Cretaceous geodynamic models of the transition from basement accretionary wedge to passive-margin cover successions. Pahau Terrane deposition was mainly Barremian to Aptian but continued locally through to late Albian time, with major source areas in the adjacent Kaweka and Waipapa terranes and minor inputs from the inboard Median Batholith. Waioeka Terrane deposition was mainly Albian, with distinctive and exclusive sediment sources, principally from the Median Batholith but with minor inputs from the Western Province. Alternative tectonic models to deliver such exclusive Median Batholith and Western Province-derived sediment to the mid-Cretaceous Zealandia continental margin are: (1) the creation of a rift depression across Zealandia or (2) sinistral displacement of South Zealandia with respect to North Zealandia, to expose Western Province rocks directly at the Zealandia margin. Detrital zircon age patterns of Cretaceous cover successions of the Eastern Province of eastern New Zealand demonstrate purely local sources in the adjacent Kaweka and Waipapa terranes. Cretaceous zircon components show a decline in successions of late Early Cretaceous age and disappear by late Late Cretaceous time, suggesting the abandonment or loss of access to both the Median Batholith and Western Province as sediment sources.

scholarly journals IDADE MÁXIMA DE SEDIMENTAÇÃO E PROVENIÊNCIA DO COMPLEXO JEQUITINHONHA NA ÁREA-TIPO (ORÓGENO ARAÇUAÍ): PRIMEIROS DADOS U-PB (LA-ICP-MS) DE GRÃOS DETRÍTICOS DE ZIRCÃO

2013 ◽  
Author(s):  
Tatiana Gonçalves-Dias ◽  
Antônio Carlos Pedrosa-Soares ◽  
Ivo Antônio Dussin ◽  
Fernando Flecha de Alkmim ◽  
Fabrício Andrade Caxito ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Passive Margin ◽  
Rift System ◽  
Sediment Sources ◽  
Chapada Diamantina ◽  
Mean Values ◽  
Type Area ◽  
Icp Ms ◽  
Detrital Zircon Ages ◽  
Araçuaí Orogen

O Complexo Jequitinhonha, situado no nordeste de Minas Gerais, é uma das unidades metassedimentares mais extensas do Orógeno Araçuaí. Na área-tipo, situada na região de Jequitinhonha -Almenara, este complexo consiste de paragnaisse peraluminoso (kinzigítico) migmatizado, com intercalações de quartzito, grafita gnaisse e rocha calcissilicática. Os dados isotópicos U-Pb (LA-ICP-MS) de 80 grãos detríticos de zircão de uma amostra de quartzito, coletada em corte da BR-367 cerca de 12 km a SW de Almenara, permitem identificar seis principais intervalos de idades, cujas médias das modas sugerem as seguintes fontes de sedimentos: o embasamento São Francisco-Congo (2541 ± 8 Ma e 2044 ± 6 Ma), o sistema Espinhaço-Chapada Diamantina (1819 ± 6 Ma, 1487 ± 5 Ma e 1219 ± 3 Ma) e o sistema de rifteamento Noqui-Zadiniano-Mayumbiano-Salto da Divisa (956 ± 4 Ma). A idade máxima de sedimentação em 898 ± 8 Ma é dada pelo zircão mais novo. Os espectros de idades desta amostra do Complexo Jequitinhonha e de rochas do Grupo Macaúbas são muito similares, indicando correlação entre estas unidades. Contudo, no Complexo Jequitinhonha inexiste evidência de glaciação. Assim, o Complexo Jequitinhonha na área-tipo é interpretado como depósito de margem passiva da bacia precursora do Orógeno Araçuaí, mais novo que a glaciação Macaúbas e, portanto, equivalente às formações Chapada Acauã Superior e Ribeirão da Folha.Palavras-chave: Complexo Jequitinhonha, geocronologia U-Pb, Orógeno AraçuaíABSTRACT: MAXIMUM SEDIMENTATION AGE AND PROVENANCE OF THE JEQUITINHONHA COMPLEX IN THE TYPE-AREA (ARAÇUAÍ OROGEN): FIRST U-PB (LA-ICP-MS) DATA FROM DETRITAL ZIRCON GRAINS.The Jequitinhonha Complex is one of the most extensive metasedimentary units of the Araçuaí Orogen. In the type-area, located in the Jequitinhonha-Almenara region, this complex includes migmatized peraluminous (kinzigitic) paragneiss with intercalations of quartzite, graphite gneiss and calcsilicate rock. U-Pb (LA-ICP-MS) data from 80 detrital zircon grains extracted from a quartzite sample, collected in a BR-367 road cut around 12 km SW from Almenara, yielded six main age intervals, which mode mean values suggest the following sediment sources: the São Francisco-Congo basement (2541 ± 8 Ma and 2044 ± 6 Ma), the Espinhaço-Chapada Diamantina system (1819 ± 6 Ma, 1487 ± 5 Ma and 1219 ± 3 Ma), and the Noqui-Zadinian-Mayumbian-Salto da Divisa rift system (956 ± 4 Ma). The maximum sedimentation age of 898 ± 8 Ma is constrained by the youngest zircon grain. Spectra of detrital zircon ages for this sample of the Jequitinhonha Complex and rocks of the Macaúbas Group are very similar and suggest a correlation between these units. However, this complex shows no evidence of glaciation. Therefore, the Jequitinhonha Complex in its type-area is interpreted as a passive margin deposit of the precursor basin of the Araçuaí Orogen, younger than the Macaúbas glaciation and, thus, equivalent of the Upper Chapada Acauã and Ribeirão da Folha formations.Keywords: Jequitinhonha Complex, U-Pb geochronology, Araçuaí Orogen

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