The role of episodic bombardment in geophysics

Clube, S. V. M.; Napier, W. M.

doi:10.1016/0012-821x(82)90148-0

Cited by 31 publications

(8 citation statements)

References 45 publications

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“…The similarity of the impact cratering period to the dominant period detected in geological phenomena led to the renewed suggestion [38] that terrestrial tectonic/climatic processes might be modulated in some way by large-body impacts [69]. Periodic or quasi-periodic impacts could come from showers of comets [33 ].…”

Section: Discussionmentioning

confidence: 98%

Episodes of terrestrial geologic activity during the past 260 million years: A quantitative approach

Rampino

Caldeira

1992

Celestial Mech Dyn Astr

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Records of major geologic events of the past ~260 Myr including: biologic extinction events, ocean-anoxic and black-shale events, major changes in sea level, major ew~porite (salt) deposits, continental flood-basalt eruptions, first-order discontinuities in sea-floor spreading, and major mountain building events, have been aggregated and analyzed with moving-window and spectral techniques that facilitate recognition of clustering and possible cyclicity. Significant clustering of events suggests a model in which changes in rates and directions of sea-floor spreading ("ridge jumps") are associated with episodic rifting, volcanism, mountain building, global sea level and changes in the composition of the earth's atmosphere via the carbon cycle. Variation in atmospheric CO2 affects global climate, ocean circulation and marine productivity. The geologic data formally show a statistically significant underlying periodicity of 26.6 Myr for the Mesozoic and Cenozoic (the exact period differs with minor changes in geologic dating). Phase inIbrmation suggests that the most recent maximum of the cycle occurred within the last 9 Myr, and may be close to the present time. The quasi-regular pulses of activity might be related to internal earth processes. However, a similar periodicity in impact craters and in galactic dynamics, and a one-to-one correlation among mass extinctions, large impact events, and flood-basalt volcanism, indicate an extraterrestrial pacemaker.

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Section: Discussionmentioning

confidence: 98%

Episodes of terrestrial geologic activity during the past 260 million years: A quantitative approach

Rampino

Caldeira

1992

Celestial Mech Dyn Astr

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“…Since impacts of large extraterrestrial bodies develop gigantic amounts of energy [3,[17][18][19][20][21]: (Figure 11(b)) that may have world-wide influence, Jordan as located at the margin of the Arabian Plate, adjacent to the Jordan Valley Rift, and close to a triple junction (Figure 2), represents a "sensitive" geological setting with regard to convulsive events on globe that may initiate sea level changes, tsunamis, earthquakes, etc.…”

Section: Discussionmentioning

confidence: 99%

Did Major Impacts Affect Sedimentologic/Sequence-Analytical Pattern of the Early Palaeozoic Sedimentary Systems of Jordan, Arabian Plate?

Schneider¹,

Salameh²

2012

OJG

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Based on profound sequence-analytical data of the early Palaeozoic sedimentary systems of Jordan, Arabian Plate, a correlation attempt is proposed with regard to possible major impact events after Price [10]. His methodological concept tells that abrupt 441 Ma. Referring to the fact that major impacts may trigger, respectively influence, exogenic and endogenic processes on an over-regional, even global, extent, this paper put the “sensitive” geological setting of Jordan at the Arabian Platform’s margin into focus. That mainly concerns the early Palaeozoic coastlines as to sea level change as well as the Jordan Valley Rift as being possibly to susceptible for tectonic re-activation changes of both direction and speed of plate motions would indicate such convulsive processes as occurred on: 550 Ma, 526.5 Ma, 514 Ma, 502 Ma, 456/455.4 Ma, and following triggering of magmatism at the Precambrian/Cambrian boundary. The following phenomena are taken into account: Faulting and magmatism triggered along the Jordan Valley Rift (Wadi Araba) in connection with the Pan-African Orogeny, anoxic sediments, temporary high detrital input onto the adjoining stable platform from Gondwana hinterlands, and significant chemical weathering in the Gondwana source areas by intensive acid (nitric) rain directing mineral content variation in the “Nubian Sandstones” (e.g. feldspar, kaolinite/dickite, tourmaline)

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“…Myr periodicity has been reported in several other geological/geophysical records including biological mass extinctions, impact cratering and low sea levels of the past 250 Myr. Galactic forcing of terrestrial processes has long been suspected (Clube and Napier, 1982). McCrea (1981) has suggested the possible exogenetic forcing of various of the earth's processes including glaciation.…”

Section: A 33mentioning

confidence: 99%

‘Clean’ spectral analysis of long‐term sea‐level changes

1990

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A new ‘clean’ spectral technique has been applied, for the first time, to analyse a record of long‐term sea‐level fluctuation during the last 200 million year (Myr). The technique is based on a one dimensional complex deconvolution algorithm and removes the effects of the data sampling as well as the artifacts arising from the choice of data window. The analysis reveals a dominant periodicity of 33 Myr in the sea‐level variations. This periodicity compares well with the known half‐period of the Sun's oscillation perpendicular to the galactic plane. Interestingly, a 33 Myr periodicity can also be correlated with the reported mass extinction cycles and other geological periodicities. The results suggest galactic forcing as a possible driving mechanism for quasi‐periodic terrestrial processes.

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The role of episodic bombardment in geophysics

Cited by 31 publications

References 45 publications

Episodes of terrestrial geologic activity during the past 260 million years: A quantitative approach

Episodes of terrestrial geologic activity during the past 260 million years: A quantitative approach

Did Major Impacts Affect Sedimentologic/Sequence-Analytical Pattern of the Early Palaeozoic Sedimentary Systems of Jordan, Arabian Plate?

‘Clean’ spectral analysis of long‐term sea‐level changes

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