U-Pb detrital zircon geochronology, petrography, and synthesis of the middle Neoproterozoic Visingsö Group, Southern Sweden

Pulsipher, Mikaela A.; Dehler, Carol M.

doi:10.1016/j.precamres.2018.11.011

Cited by 12 publications

(5 citation statements)

References 49 publications

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“…We targeted the mid‐Neoproterozoic Visingsö Group given an obvious dearth of data in the early and middle Neoproterozoic. The Visingsö Group comprises predominantly heterolithic siliciclastics (shale, sandstone, and conglomerate) and is estimated to be ~1000 m thick (Collini, 1951; c.f., Pulsipher & Dehler, 2018). The upper member (<580 m thick) is predominantly carbonaceous shale with subordinate beds of dolomite, sandstone, and dolomite/phosphorite nodules.…”

Section: Geological Setting and Geochronology Of The Visingsö Groupmentioning

confidence: 99%

“…The upper member (<580 m thick) is predominantly carbonaceous shale with subordinate beds of dolomite, sandstone, and dolomite/phosphorite nodules. This succession was deposited in an intracratonic basin that was affected by extensional tectonism, possibly related to the breakup of Rodinia (Larsen & Nørgaard‐Pedersen, 1988; Pulsipher & Dehler, 2018; Vidal, 1974).…”

Section: Geological Setting and Geochronology Of The Visingsö Groupmentioning

confidence: 99%

“…We determined the P content of >100 samples from the Visingsö Group that lacked evidence for macroscopic phosphates. Until now, the geochronologic age of the Visingsö Group was unconstrained—with the only direct age being a detrital zircon with a maximum depositional age of 886 ± 9 Ma (Moczydłowska et al, 2018; Pulsipher & Dehler, 2018). To address the need for better age constraints, we obtained a new Re–Os age for the phosphate‐rich Upper Formation in the Visingsö Group of 753.3 ± 5.9 Ma (Figures 2 and 3; Table S1).…”

Section: Geological Setting and Geochronology Of The Visingsö Groupmentioning

confidence: 99%

Section: G Eolog I C Al S E T Ting and G Eochronology Of The Vis Ing ...mentioning

confidence: 99%

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A sedimentary record of the evolution of the global marine phosphorus cycle

et al. 2022

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Phosphorus (P) is typically considered to be the ultimate limiting nutrient for Earth's biosphere on geologic timescales. As P is monoisotopic, its sedimentary enrichment can provide some insights into how the marine P cycle has changed through time. A previous compilation of shale P enrichments argued for a significant change in P cycling during the Ediacaran Period (635-541 Ma). Here, using an updated P compilation-with more than twice the number of samples-we bolster the case that there was a significant transition in P cycling moving from the Precambrian into the Phanerozoic. However, our analysis suggests this state change may have occurred earlier than previously suggested. Specifically in the updated database, there is evidence for a transition ~35 million years before the onset of the Sturtian Snowball Earth glaciation in the Visingsö Group, potentially divorcing the climatic upheavals of the Neoproterozoic from changes in the Earth's P cycle. We attribute the transition in Earth's sedimentary P record to the onset of a more modern-like Earth system state characterized by less reducing marine conditions, higher marine P concentrations, and a greater predominance of eukaryotic organisms encompassing both primary producers and consumers. This view is consistent with organic biomarker evidence for a significant eukaryotic contribution to the preserved sedimentary organic matter in this succession and other contemporaneous Tonian marine sedimentary rocks. However, we stress that, even with an expanded dataset, we are likely far from pinpointing exactly when this transition occurred or whether Earth's history is characterized by a single or multiple transitions in the P cycle.

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Section: Geological Setting and Geochronology Of The Visingsö Groupmentioning

confidence: 99%

Section: Geological Setting and Geochronology Of The Visingsö Groupmentioning

confidence: 99%

Section: Geological Setting and Geochronology Of The Visingsö Groupmentioning

confidence: 99%

Section: G Eolog I C Al S E T Ting and G Eochronology Of The Vis Ing ...mentioning

confidence: 99%

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A sedimentary record of the evolution of the global marine phosphorus cycle

et al. 2022

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“…Traditionally, in provenance studies, detrital zircon grain ages are compared with ages of probable source terranes, which delivered sediments to the depositional basin (Margalef et al, 2016;Shi et al, 2020;Tong et al, 2019;Wang, Wu, et al, 2018). On the other hand, numerous studies have proved that U-Pb dating of detrital zircon grains is a useful tool to reconstruct the tectonic evolution of a sedimentary basin, as well as to infer sediment pathway (Chaudhuri, Banerjee, & Le Pera, 2018;Gärtner et al, 2016;Kang et al, 2019;Pulsipher & Dehler, 2019;Saha, Burley, & Banerjee, 2018;Zhao et al, 2020).…”

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Microtexture and U–Pb geochronology of detrital zircon grains in the Chachalacas beach, Veracruz State, Gulf of Mexico

et al. 2020

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trace element concentrations, and U-Pb geochronology of detrital zircon grains recovered from the Chachalacas beach in the western Gulf of Mexico were investigated to infer palaeoenvironmental conditions. The mineralogy of bulk sediments revealed the presence of both chemically stable (titano-magnetite, zircon, and quartz) and unstable (amphibole and K-feldspar) minerals. The zircon grain microtextures or surface features were grouped as two types: (a) mechanical origin and (b) mechanical and chemical origin. The mechanical surface features such as V-marks, arc shaped, and meandering steps indicate a high-energy littoral and sub-aqueous marine environment. The chemical surface features like solution pits, precipitation, solution crevasses, adhered particles, and silica pellicle revealed a silica saturated marine environment. The well-rounded zircon grains with bulbous edges are characterized by long transport and aeolian origin. The Th/U ratio, a negative Eu (Eu/Eu* = $0.08-0.72) and positive Ce (Ce/Ce* = >1) anomalies in the chondrite-normalized REE patterns of all zircon grains suggested that they primarily formed from magmatic processes. The detrital zircon grain U-Pb ages showed a wide variation from Cenozoic to Proterozoic with an abundance of Cenozoic ages ($1.59-64.3 Ma; n = 44), interpreted as mixing of beach sediments by a longshore current. The comparison of zircon grain ages of this study with ages reported from the source terranes revealed that the likely source for Cenozoic zircon grains was the Eastern Alkaline Province of Mexico. Similarly, the Mesozoic ($68.5-241.9 Ma) and Palaeozoic ($253.2-284.8 Ma) zircon grains in the Chachalacas beach were possibly derived from the Valle de Huizachal and Mesa Central provinces. Proterozoic ages from $574 to 1846 Ma indicated a probable contribution from the Oaxacan and Chiapas Massif complexes, which are dominated by Grenvillian basement rocks.

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