A search for shocked quartz at the Triassic-Jurassic boundary in the Fundy and Newark basins of the Newark Supergroup

Mossman, David J.; Grantham, Robert G.; Langenhorst, F.

doi:10.1139/cjes-35-2-101

Cited by 7 publications

(11 citation statements)

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“…Besides these very few cases, no planar features or lamellae potentially representing planer deformation features were observed. Thus, as was the case for Mossman et al (1998), the search for shocked quartz grains was not successful.…”

Section: Resultsmentioning

confidence: 97%

“…Although shocked quartz has not been reported from eastern North America, Bice et al (1992) reported it from a Tr-J boundary section in Tuscany, and there is an additional report from the Kendelbach section in Austria (Badjukov et al, 1987). However, in both cases the shocked quartz was identified only petrographically, which is now not considered definitive (e.g., Grieve et al, 1996;Mossman et al, 1998), and in neither case has there been a subsequent attempt at independent confirmation. Of course, if the impact site were very distant, or in oceanic crust, it is possible that shocked quartz would be very rare or absent.…”

Section: Relationship To Possible Impactmentioning

confidence: 92%

“…Smith et al (1988) looked specifically for an Ir anomaly in the same units in the Jacksonwald syncline that we examine here, but the amounts present were below their detectable limits. Mossman et al (1998) looked for shocked quartz and Ir anomalies without reported success in the same interval. Fowell (1994).…”

Section: Newark Basin Geochemical and Mineralogical Anomaliesmentioning

confidence: 99%

“…Mossman et al (1998) examined the stratigraphic region near the Tr-J boundary, including at Partridge Island, for shocked quartz and Ir. Although some planar features were seen, they concluded that none were characteristic of shocked metamorphism.…”

Section: Tr-j Boundary In Other Pangean Continental Riftsmentioning

confidence: 99%

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Continental Triassic-Jurassic boundary in central Pangea: Recent progress and discussion of an Ir anomaly

Olsen

Koeberl²,

Huber³

et al. 2002

Catastrophic Events and Mass Extinctions: Impacts and Beyond

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The Triassic-Jurassic (Tr-J) boundary marks one of the five largest mass extinctions in the past 0.5 b.y. In many of the exposed rift basins of the Atlantic passive margin of eastern North America and Morocco, the boundary is identified as an interval of stratigraphically abrupt floral and faunal change within cyclical lacustrine sequences. A comparatively thin interval of Jurassic strata separates the boundary from extensive overlying basalt flows, the best dates of which (ca. 202 Ma) are practically indistinguishable from recent dates on tuffs from marine Tr-J boundary sequences. The pattern and magnitude of the Tr-J boundary at many sections spanning more than 10Њ of paleolatitude in eastern North America and Morocco are remarkably similar to those at the Cretaceous-Tertiary boundary, sparking much debate on the cause of the end-Triassic extinctions, hypotheses focusing on bolide impacts and climatic changes associated with flood basalt volcanism.Four prior attempts at finding evidence of impacts at the Tr-J boundary in these rift basin localities were unsuccessful. However, after more detailed sampling, a modest Ir anomaly has been reported (up to 285 ppt, 0.29 ng/g) in the Newark rift basin (New York, New Jersey, Pennsylvania, United States), and this anomaly is directly associated with a fern spike.

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Section: Resultsmentioning

confidence: 97%

Section: Relationship To Possible Impactmentioning

confidence: 92%

Section: Newark Basin Geochemical and Mineralogical Anomaliesmentioning

confidence: 99%

Section: Tr-j Boundary In Other Pangean Continental Riftsmentioning

confidence: 99%

See 2 more Smart Citations

Continental Triassic-Jurassic boundary in central Pangea: Recent progress and discussion of an Ir anomaly

Olsen

Koeberl²,

Huber³

et al. 2002

Catastrophic Events and Mass Extinctions: Impacts and Beyond

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show abstract

“…1992) and the Northern Calcareous Alps, Austria (Badjukov et al. 1987) but unequivocal signs of shock could not be confirmed (Hallam 1990, 2002; Mossman et al. 1998; Simms 2007).…”

Section: Discussionmentioning

confidence: 99%

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Schmieder

Buchner

Schwarz

et al. 2010

Meteorit & Planetary Scien

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Abstract-40 Ar ⁄ 39 Ar dating of potassium feldspar (primary spherulitic-blocky and secondary idiomorphic K-feldspar) separated from impact-metamorphosed gneiss found near Videix in the western central part of the Rochechouart impact structure (NW Massif Central, France) yielded a Rhaetian combined age of 201 ± 2 Ma (2r), indistinguishable within uncertainty from the age of the Triassic ⁄ Jurassic boundary. Ballen quartz intergrown with the primary K-feldspar indicates post-shock temperatures exceeding approximately 1000°C that affected the precursor gneiss. Geochemically, both feldspar types represent essentially pure potassium end-members. Apart from the approximately 15 km diameter impact deposit area, the youngest crystallization age known for basement rocks in this part of the Massif Central is approximately 300 Ma. No endogenic magmatic-thermal events are known to have occurred later in this region. The K-feldspar recrystallized from local feldspar melts and superimposed post-shock hydrothermal crystallization, probably within some thousands of years after the impact. It is, therefore, suggested that the 40 Ar ⁄ 39 Ar age for the Videix gneiss (as a potassic ''impact metasomatite'') dates the Rochechouart impact, in consistence with evidence for K-metasomatism in the Rochechouart impactites. The new age value is distinctly younger than the previously obtained Karnian-Norian age for Rochechouart and, thus, contradicts the Late Triassic multiple impact theory postulated some years ago. In agreement with the paleogeographic conditions in the western Tethys domain around the Triassic ⁄ Jurassic boundary, the near-coastal to shallow marine Rochechouart impact is compatible with the formation of seismites and tsunami deposits in the latest Triassic of the British Isles and possible related deposits in other parts of Europe.

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Multiple Ir anomalies in uppermost Triassic to Jurassic-age strata of the Blomidon Formation, Fundy basin, eastern Canada

Tanner

Kyte

Walker

2008

Earth and Planetary Science Letters

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A search for shocked quartz at the Triassic-Jurassic boundary in the Fundy and Newark basins of the Newark Supergroup

Cited by 7 publications

References 0 publications

Continental Triassic-Jurassic boundary in central Pangea: Recent progress and discussion of an Ir anomaly

Continental Triassic-Jurassic boundary in central Pangea: Recent progress and discussion of an Ir anomaly

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Multiple Ir anomalies in uppermost Triassic to Jurassic-age strata of the Blomidon Formation, Fundy basin, eastern Canada

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A search for shocked quartz at the Triassic-Jurassic boundary in the Fundy and Newark basins of the Newark Supergroup

Cited by 7 publications

References 0 publications

Continental Triassic-Jurassic boundary in central Pangea: Recent progress and discussion of an Ir anomaly

Continental Triassic-Jurassic boundary in central Pangea: Recent progress and discussion of an Ir anomaly

A Rhaetian40Ar/39Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Multiple Ir anomalies in uppermost Triassic to Jurassic-age strata of the Blomidon Formation, Fundy basin, eastern Canada

Contact Info

Product

Resources

About

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record