Needles in a haystack: Detrital zircon U Pb ages and the maximum depositional age of modern global sediment

Sharman, Glenn R.; Malkowski, Matthew A.

doi:10.1016/j.earscirev.2020.103109

Cited by 97 publications

(59 citation statements)

References 136 publications

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“…155-150 Ma for thrusting and subsequent deformation of the Galice Formation in the Klamath Mountains (Harper et al, 1994;MacDonald et al, 2006). Based on the degree of concurrence with paleontologic ages and the high proportion of young zircon in the Galice Formation samples (i.e., Cawood, 2012;Dickinson and Gehrels, 2009b;Spencer et al, 2016;Herriott et al, 2019;Sharman and Malkowski, 2020), we suggest that our MDAs are reasonable estimates for turbidite deposition in the Galice Formation.…”

Section: Maximum Depositional Agessupporting

confidence: 53%

“…Samples from the Rattlesnake Creek terrane cover sequence do not contain a high proportion of young ages (e.g., as low as 7% total Mesozoic ages; Table 3), making MDA assessment nonideal (Dickinson and Gehrels, 2009b;Spencer et al, 2016;Andersen et al, 2019;Coutts et al, 2019;Herriott et al, 2019;Gehrels et al, 2020;Sharman and Malkowski, 2020). Nonetheless, our samples do include 38 grains younger than the previously assigned minimum age of 193 Ma (Wright and Wyld, 1994) and thus provide new constraints on the timing of deposition for por-tions of the Rattlesnake Creek terrane cover sequence.…”

Section: Maximum Depositional Agesmentioning

confidence: 80%

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A crucial geologic test of Late Jurassic exotic collision versus endemic re-accretion in the Klamath Mountains Province, western United States, with implications for the assembly of western North America

et al. 2021

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Differing interpretations of geophysical and geologic data have led to debate regarding continent-scale plate configuration, subduction polarity, and timing of collisional events on the western North American plate margin in pre–mid-Cretaceous time. One set of models involves collision and accretion of far-traveled “exotic” terranes against the continental margin along a west-dipping subduction zone, whereas a second set of models involves long-lived, east-dipping subduction under the continental margin and a fringing or “endemic” origin for many Mesozoic terranes on the western North American plate margin. Here, we present new detrital zircon U-Pb ages from clastic rocks of the Rattlesnake Creek and Western Klamath terranes in the Klamath Mountains of northern California and southern Oregon that provide a test of these contrasting models. Our data show that portions of the Rattlesnake Creek terrane cover sequence (Salt Creek assemblage) are no older than ca. 170–161 Ma (Middle–early Late Jurassic) and contain 62–83% Precambrian detrital zircon grains. Turbidite sandstone samples of the Galice Formation are no older than ca. 158–153 Ma (middle Late Jurassic) and contain 15–55% Precambrian detrital zircon grains. Based on a comparison of our data to published magmatic and detrital ages representing provenance scenarios predicted by the exotic and endemic models (a crucial geologic test), we show that our samples were likely sourced from the previously accreted, older terranes of the Klamath Mountains and Sierra Nevada, as well as active-arc sources, with some degree of contribution from recycled sources in the continental interior. Our observations are inconsistent with paleogeographic reconstructions that are based on exotic, intra-oceanic arcs formed far offshore of North America. In contrast, the incorporation of recycled detritus from older terranes of the Klamath Mountains and Sierra Nevada, as well as North America, into the Rattlesnake Creek and Western Klamath terranes prior to Late Jurassic deformation adds substantial support to endemic models. Our results suggest that during long-lived, east-dipping subduction, the opening and subsequent closing of the marginal Galice/Josephine basin occurred as a result of in situ extension and subsequent contraction. Our results show that tectonic models invoking exotic, intra-oceanic archipelagos composed of Cordilleran arc terranes fail a crucial geologic test of the terranes’ proposed exotic origin and support the occurrence of east-dipping, pre–mid-Cretaceous subduction beneath the North American continental margin.

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Section: Maximum Depositional Agessupporting

confidence: 53%

Section: Maximum Depositional Agesmentioning

confidence: 80%

A crucial geologic test of Late Jurassic exotic collision versus endemic re-accretion in the Klamath Mountains Province, western United States, with implications for the assembly of western North America

et al. 2021

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“…The reliability of the detrital zircon dating technique for sedimentary sequences will not be reviewed here, having been discussed and assessed by many others who have identified biases, methodological issues, and interpretative problems with detrital zircons (Allen & Campbell, 2012;Andersen, Elburg & Magwaza, 2019;Coutts, Matthews & Hubbard, 2019;Horstwood et al, 2016;Johnstone, Schwartz & Holm-Denoma, 2019;Klötzli et al, 2009;Košler et al, 2013;Sharman & Malkowski, 2020).…”

Section: Winton Formation Agementioning

confidence: 99%

A new giant sauropod,Australotitan cooperensisgen. et sp. nov., from the mid-Cretaceous of Australia

Hocknull

Wilkinson

Lawrence

et al. 2021

PeerJ

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A new giant sauropod, Australotitan cooperensis gen. et sp. nov., represents the first record of dinosaurs from the southern-central Winton Formation of the Eromanga Basin, Australia. We estimate the type locality to be 270–300 m from the base of the Winton Formation and compare this to the semi-contemporaneous sauropod taxa, Diamantinasaurus matildae Hocknull et al., 2009, Wintonotitan wattsi Hocknull et al., 2009 and Savannasaurus elliottorum Poropat et al., 2016. The new titanosaurian is the largest dinosaur from Australia as represented by osteological remains and based on limb-size comparisons it reached a size similar to that of the giant titanosaurians from South America. Using 3-D surface scan models we compare features of the appendicular skeleton that differentiate Australotitan cooperensis gen. et sp. nov. as a new taxon. A key limitation to the study of sauropods is the inability to easily and directly compare specimens. Therefore, 3-D cybertypes have become a more standard way to undertake direct comparative assessments. Uncoloured, low resolution, and uncharacterized 3-D surface models can lead to misinterpretations, in particular identification of pre-, syn- and post-depositional distortion. We propose a method for identifying, documenting and illustrating these distortions directly onto the 3-D geometric surface of the models using a colour reference scheme. This new method is repeatable for researchers when observing and documenting specimens including taphonomic alterations and geometric differences. A detailed comparative and preliminary computational phylogenetic assessment supports a shared ancestry for all four Winton Formation taxa, albeit with limited statistical support. Palaeobiogeographical interpretations from these resultant phylogenetic hypotheses remain equivocal due to contrary Asian and South American relationships with the Australian taxa. Temporal and palaeoenvironmental differences between the northern and southern-central sauropod locations are considered to explain the taxonomic and morphological diversity of sauropods from the Winton Formation. Interpretations for this diversity are explored, including an eco-morphocline and/or chronocline across newly developed terrestrial environments as the basin fills.

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“…This calculation was based on the weighted average age of the youngest clusters of multiple analyses (at least three analyses, n ⩾ 3) with overlapping in age at 2σ (statistical error in millions of years), as proposed by Dickinson and Geherels (2009). This method provides a conservative measure of the depositional age compared to the youngest single grain ages, especially for ancient samples (Dickinson andGeherels 2009, Sharman andMalkowski 2020). These calculated ages were compared with the youngest peak age population of each unit (Tab.…”

Section: Maximum Depositional Agesmentioning

confidence: 99%

Depositional setting and U-Pb detrital record of rift-related deposits in the Moeda Formation (Minas Supergroup) at the Gandarela and Ouro Fino synclines, Quadrilátero Ferrífero, Brazil

et al. 2021

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The Moeda Formation (Caraça Group, base of Minas Supergroup) registers the initial rift stages of the Minas Basin in the Quadrilátero Ferrífero, Southern São Francisco craton, SE-Brazil. We present stratigraphic and U-Pb detrital zircon dating analyses of the Moeda Formation that contribute to the comprehension of its sedimentary evolution in the southernmost Gandarela and Ouro Fino synclines (Central-Eastern Quadrilátero Ferrifero). The Moeda Formation sequence consists of a basal proximal alluvial fan with clast-supported conglomerates, grading upward into an alluvial floodplain with quartz arenites, and upper massive sandstones from distal fluvial fans. Because the Moeda Formation is normally limited by similar lithologies at both its base (Nova Lima Group, Rio das Velhas Supergroup) and top (Batatal Formation, uppermost Caraça Group) and stratigraphic inversion has occurred in the study area, U-Pb detrital zircon dating was also extended to these units to differentiate them stratigraphically. The youngest clusters of detrital zircon ages in the Nova Lima Group and Moeda and Batatal formations were 2716, 2777 and 2786 Ma, respectively. Based on our data and relevant literature, the depositional age of the Moeda Formation was interpreted as between 2716 and 2520 Ma with the Mesoarchean continental crust, the Rio das Velhas Supergroup and the Archean TTG complexes as its main source areas.

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Needles in a haystack: Detrital zircon U Pb ages and the maximum depositional age of modern global sediment

Cited by 97 publications

References 136 publications

A crucial geologic test of Late Jurassic exotic collision versus endemic re-accretion in the Klamath Mountains Province, western United States, with implications for the assembly of western North America

A crucial geologic test of Late Jurassic exotic collision versus endemic re-accretion in the Klamath Mountains Province, western United States, with implications for the assembly of western North America

A new giant sauropod,Australotitan cooperensisgen. et sp. nov., from the mid-Cretaceous of Australia

Depositional setting and U-Pb detrital record of rift-related deposits in the Moeda Formation (Minas Supergroup) at the Gandarela and Ouro Fino synclines, Quadrilátero Ferrífero, Brazil

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