Five hundred million years of punctuated addition of juvenile crust during extension in the Goochland Terrane, central Appalachian Piedmont Province

Martin, Aaron J.; Kadel-Harder, Irene M.; Owens, Brent E.; Kitajima, Kouki; Samson, Scott D.; Verma, Sanjeet K.

doi:10.1080/00206814.2019.1622156

Cited by 4 publications

(9 citation statements)

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“…DOI: https://doi.org/10.2138/am-2021-7436. http://www.minsocam.org/ Martin et al, 2020, Removal of barite from detrital zircon Milling the barite and zircon mixture caused loss of zircon grains in all our experiments.…”

Section: Resultsmentioning

confidence: 77%

“…DOI: https://doi.org/10.2138/am-2021-7436. http://www.minsocam.org/ Martin et al, 2020, Removal of barite from detrital zircon the University of Texas-Austin and the other in the Arizona LaserChron Center at the University of Arizona (Table 1). Our procedures followed the standard operating practices in each laboratory.…”

Section: Design Of Experimentsmentioning

confidence: 99%

“…DOI: https://doi.org/10.2138/am-2021-7436. http://www.minsocam.org/ Martin et al, 2020, Removal of barite from detrital zircon followed by sieving and drying as for experiment UT1X. After this step, barite was not visible in the coarse fraction, so we poured the coarse grains onto wax paper for transport to the imaging facility.…”

Section: Design Of Experimentsmentioning

confidence: 99%

“…DOI: https://doi.org/10.2138/am-2021-7436. http://www.minsocam.org/ Martin et al, 2020, Removal of barite from detrital zircon chemical method did not disturb the Lu-Hf isotopic system in zircon, so this technique appears viable for studies that make use of the Lu-Hf isotopic system alone.…”

Section: Comments and Recommended Workflowmentioning

confidence: 99%

“…DOI: https://doi.org/10.2138/am-2021-7436. http://www.minsocam.org/ Martin et al, 2020, Removal of barite from detrital zircon Milling the zircon and barite mixture is a widespread practice and some geologists may assume that the zircon is not significantly broken because of its greater tenacity. However, the extent of comminution and loss of zircon grains during milling in a ball mill followed by sieving has not been tested.…”

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Experiments on two techniques for the removal of barite from detrital zircon

Martin

Guerrero-Juarez

Rocha-Estopier

2021

American Mineralogist

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Barite (BaSO 4) is a common mineral in sandstone that must be removed during separation of detrital zircon (ZrSiO 4). One widespread technique for the removal of barite exploits its lesser tenacity by milling the barite and zircon mixture in a ball mill. Here we test the extent to which such milling affects zircon and thus whether the milling could introduce bias into the detrital zircon sample. We then describe a new chemical technique for the removal of barite from detrital zircon. We find that milling a mixture of barite and zircon both breaks and causes loss of zircon grains, potentially introducing bias into a detrital zircon sample. Boiling barite in a 0.94 molar aqueous solution of sodium carbonate for four hours converts most grains to barium carbonate. The barium carbonate grains are opaque white and thus visually distinguishable from zircon, allowing separation by hand under a stereoscopic microscope. Alternatively, the barium carbonate grains can be dissolved by boiling in sixteen weight percent nitric acid for thirty minutes. In our experiments, boiling zircon in sodium carbonate solution and/or concentrated (sixty-five weight percent) nitric acid cleaned the surfaces of and the cracks in the grains but did not visibly change the zircon surfaces in other ways. Boiling only in concentrated nitric acid did not measurably affect the U-Pb and Lu-Hf isotopic systems in zircon interiors and boiling in a sodium carbonate solution followed by nitric acid did not detectably alter the Lu-Hf isotopic system. However, boiling in a concentrated sodium carbonate solution followed by nitric acid did disturb the U-Pb isotopic system in zircon interiors. Our results highlight the importance of proper technique during zircon isolation to minimize the introduction of bias into the sample. This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Resultsmentioning

confidence: 77%

Section: Design Of Experimentsmentioning

confidence: 99%

Section: Design Of Experimentsmentioning

confidence: 99%

Section: Comments and Recommended Workflowmentioning

confidence: 99%

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Experiments on two techniques for the removal of barite from detrital zircon

Martin

Guerrero-Juarez

Rocha-Estopier

2021

American Mineralogist

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Defining the Hafnium Isotopic Signature of the Appalachian Orogen through Analysis of Detrital Zircons from Modern Fluvial Sediments

Counts,

Craddock,

Gooley

2023

The Journal of Geology

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Redefinition of the Petersburg batholith and implications for crustal inheritance in the Dinwiddie terrane, Virginia, USA

et al. 2023

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Field relations as well as geochemical and petrologic studies of meta-igneous rocks assigned to the Pennsylvanian–Permian Petersburg batholith identify at least two distinct rock types: foliated metagranitoid gneiss and massive to porphyritic granite. Foliated metagranitoid gneiss of mostly granodioritic composition is geochemically distinct from associated massive and porphyritic granitic rocks. These gneissic rocks yield radiometric ages from ca. 425 Ma to ca. 403 Ma and document that many of the rocks assigned to the late Paleozoic Petersburg batholith are 100 m.y. older than the youngest portions of the composite batholith and are part of an earlier infrastructural terrane. Two samples of massive equigranular granite southwest of Petersburg, Virginia, yield ages of ca. 321 Ma and ca. 317 Ma, which are 15–20 m.y. older than ca. 300 Ma ages for porphyritic granite, massive granite, and monzodiorite near Richmond, Virginia. Geologic mapping shows that the Early Pennsylvanian granite southwest of Petersburg is separated from Late Pennsylvanian to early Permian granite near Richmond by a map-scale septum of Silurian–Devonian foliated metagranitoid gneiss, referred to herein as the informal Pocoshock Creek gneiss. Laser ablation–inductively coupled plasma–mass spectrometry data from one sample of a quartz-muscovite felsic schist xenolith show a peak age mode of ca. 529 Ma that we interpret to be the maximum depositional age. Inherited zircons from foliated metagranitoid gneiss and massive equigranular granite range from ca. 631 Ma to ca. 376 Ma, but many are Cambrian. Neoproterozoic–Cambrian quartz-muscovite felsic schist and amphibolite, Silurian–Devonian Pocoshock Creek gneiss, and Pennsylvanian–Permian granite comprise a fault-bounded terrane referred to herein as the Dinwiddie terrane. Ages of inherited cores in zircon from igneous rocks and limited detrital zircon geochronology suggest the terrane is of peri-Gondwanan affinity. U/Pb ages of healed fractures in zircon grains from foliated metagranitoid gneiss indicate low-grade deformation of the gneiss at ca. 378–376 Ma, while ca. 320–280 Ma rims on many grains record intrusion of late Paleozoic granite. The temperature-time-deformation history of the Dinwiddie terrane is distinct from the adjacent Goochland and Roanoke Rapids terranes. Orogen-scale dextral transpression likely translated the Dinwiddie terrane southward during the Alleghanian orogeny, at which time they were intruded by Pennsylvanian to Permian granite.

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Five hundred million years of punctuated addition of juvenile crust during extension in the Goochland Terrane, central Appalachian Piedmont Province

Cited by 4 publications

References 74 publications

Experiments on two techniques for the removal of barite from detrital zircon

Experiments on two techniques for the removal of barite from detrital zircon

Defining the Hafnium Isotopic Signature of the Appalachian Orogen through Analysis of Detrital Zircons from Modern Fluvial Sediments

Redefinition of the Petersburg batholith and implications for crustal inheritance in the Dinwiddie terrane, Virginia, USA

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