Platinum group element enrichments and possible chondritic Ru:Ir across the Frasnian–Famennian boundary, western New York State

Over, D. Jeffrey; Conaway, C.A.; Katz, David; Goodfellow, Wayne D.; Grégoire, D. Conrad

doi:10.1016/s0031-0182(97)00064-3

Cited by 20 publications

(9 citation statements)

References 29 publications

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“…Leroux et al [19] reported the shocked quartz related to the impact event. Over et al [20] documented Platinum group element enrichments and possible chondritic Ru/Ir across the Frasnian-Famennian boundary, confirming the impact cause for the F-F event. Girard [27] revealed iridium richness, Ni-rich spinel bearing spherules and glassy micotektites related to impact event at the F-F boundary of the standard section in southern France.…”

Section: Discussionmentioning

confidence: 92%

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Devonian Frasnian-Famennian transitional event deposits of Guangxi, South China and their possible tsunami origin

Gong

Zeng

et al. 2008

Sci. China Ser. D-Earth Sci.

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A suite of event deposits, isochronous and interrelated in origin, occurs widely near the FrasnianFamennian boundary in Guangxi, South China. It is mainly distributed in the facies areas of the platform-margin slope and inter-platform rift-trough. The rudstone or calcirudite occur in the Liujing section of Hengxian and Luoxiu and Baqi sections of Xiangzhou in the facies area of platform-margin slope. The turbidites are observed in the sections of Yangdi and Baisha of Guilin, Du'an of Debao, Nandong and Sanli of Wuxuan, Xiangtian, Ma'anshan of Xiangzhou, Nayi of Chongzuo, Yunpan of Shanglin in the facies area of inter-platform rift-trough. The massive homogenites occur in sections of Mangchang, Luofu and Road from Nandan to Tian'e and Ma'anshan etc in the facies area of inter-platform rift-trough. Herein event deposits can be correlated in stratohorizon to the turbidite in the bottom of the Lower triangularis Zone in Hony railroad cut of Belgium, Devils Gate of Nevada, USA, Atrous of Morocco, South Urals and Fore-Kolyma of northeastern Siberia of Russia, and erosional discontinuities and brecciation in the Frasnian-Famennian boundary in South Polish-Moravian shelf. The event deposits could be caused by a violent tsunami related to bolide impacts into ocean.

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Section: Discussionmentioning

confidence: 92%

“…Leroux et al [19] recognized the shocked quartz related to the impact event. Furthermore, Over et al [20] suggested the impact genesis to the F-F event through Platinum group element enrichments and possible chondritic Ru/Ir across the Frasnian-Famennian boundary. Robert and Playford [21] studied the iridium anomaly at the F-F boundary.…”

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confidence: 99%

Devonian Frasnian-Famennian transitional event deposits of Guangxi, South China and their possible tsunami origin

Gong

Zeng

et al. 2008

Sci. China Ser. D-Earth Sci.

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“…East of Beaver Meadow Creek the boundary horizon has not been resolved to a discrete horizon. Geochemical analysis of this interval did not yield significant concentrations of platinum group elements or microspherules indicative of a bolide impact in association with the boundary horizon (McGhee et al, 1984;Over et al, 1997). Branson and Mehl, 1938 Conodont biostratigraphy of the Java Formation, Upper Devonian, W. New York 167 (Stauffer).…”

Section: Frasnian-famennian Boundarymentioning

confidence: 98%

Conodont biostratigraphy of the Java Formation (Upper Devonian) and the Frasnian-Famennian boundary in western New York State

Over¹

1997

Paleozoic Sequence Stratigraphy, Biostratigraphy, and Biogeography: Studies in Honor of J. Granville ("Jess") Johnson

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Conodonts from black shale beds and carbonate intervals in the JavaFormation (Pipe Creek Shale, Hanover Shale, and Wiscoy Sandstone) of the West Falls Group enable recognition of global event horizons: Lower Kellwasser interval, Upper Kellwasser interval, and the Frasnian-Famennian boundary. Palmatolepis winchelli, P. aff. P. hassi, and Polygnathus samueli indicate the Pipe Creek Member is in MN Zone 12 and equivalent to the lower Kellwasser interval in Europe. The lower and middle Hanover Shale contain conodonts indicative of MN Zone 13; the uppermost Hanover contains Famennian conodonts of the Lower and Middle triangularis zones. The Frasnian-Famennian boundary is resolved across western New York in the upper Hanover Shale Member to a discrete horizon within a black shale bed, marked by a cryptic disconformity. This black shale bed is equivalent to the upper Kellwasser interval. The occurrence of Palmatolepis triangularis, P. clarki, P. delicatula delicatula, and P. subperlobata in the basal Dunkirk Shale of the Canadaway Group indicates assignment to the Middle triangularis Zone or younger. Ancyrodella buckeyensis and Palmatolepis subperlobata are viable taxa; Ancyrognathus sp. A is a new species.

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“…As reviewed by Sandberg et al (2002), the Late Frasnian mass extinction occured just prior to 364 Ma (within 20,000 years), representing a major extinction event that decimated most groups of marine organisms. This event has been associated with alleged impact evidence, including a weak iridium enrichment found at the Frasnian/Famennian boundary in southern China (Wang et al 1991) and in a crossboundary section in the state of New York (Over et al 1997). …”

Section: Introductionmentioning

confidence: 99%

Laser argon dating of melt breccias from the Siljan impact structure, Sweden: Implications for a possible relationship to Late Devonian extinction events

Reimold

Kelley

Sherlock

et al. 2005

Meteoritics &Amp; Planetary Science

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Abstract-In earlier studies, the 65-75 km diameter Siljan impact structure in Sweden has been linked to the Late Devonian mass extinction event. The Siljan impact event has previously been dated by KAr and Ar-Ar chronology at 342-368 Ma, with the commonly quoted age being 362.7 ± 2.2 Ma (2 σ, recalculated using currently accepted decay constants). Until recently, the accepted age for the Frasnian/Famennian boundary and associated extinction event was 364 Ma, which is within error limits of this earlier Siljan age. Here we report new Ar-Ar ages extracted by laser spot and laser step heating techniques for several melt breccia samples from Siljan (interpreted to be impact melt breccia). The analytical results show some scatter, which is greater in samples with more extensive alteration; these samples generally yield younger ages. The two samples with the least alteration yield the most reproducible weighted mean ages: one yielded a laser spot age of 377.2 ± 2.5 Ma (95% confidence limits) and the other yielded both a laser spot age of 376.1 ± 2.8 Ma (95% confidence limits) and a laser stepped heating plateau age over 70.6% 39 Ar release of 377.5 ± 2.4 Ma (2 σ). Our conservative estimate for the age of Siljan is 377 ± 2 Ma (95% confidence limits), which is significantly different from both the previously accepted age for the Frasnian/Famennian (F/F) boundary and the previously quoted age of Siljan. However, the age of the F/F boundary has recently been revised to 374.5 ± 2.6 Ma by the International Commission for Stratigraphy, which is, within error, the same as our new age. However, the currently available age data are not proof that there was a connection between the Siljan impact event and the F/F boundary extinction. This new result highlights the dual problems of dating meteorite impacts where fine-grained melt rocks are often all that can be isotopically dated, and constraining the absolute age of biostratigraphic boundaries, which can only be constrained by age extrapolation. Further work is required to develop and improve the terrestrial impact age record and test whether or not the terrestrial impact flux increased significantly at certain times, perhaps resulting in major extinction events in Earth's biostratigraphic record.

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Platinum group element enrichments and possible chondritic Ru:Ir across the Frasnian–Famennian boundary, western New York State

Cited by 20 publications

References 29 publications

Devonian Frasnian-Famennian transitional event deposits of Guangxi, South China and their possible tsunami origin

Devonian Frasnian-Famennian transitional event deposits of Guangxi, South China and their possible tsunami origin

Conodont biostratigraphy of the Java Formation (Upper Devonian) and the Frasnian-Famennian boundary in western New York State

Laser argon dating of melt breccias from the Siljan impact structure, Sweden: Implications for a possible relationship to Late Devonian extinction events

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