In:
Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 88, No. 18 ( 2007-05), p. 199-199
Abstract:
The ‘Workshop on Surface Ages and Histories: Issues in Planetary Chronology’ brought together researchers from the impact cratering, radiometric analysis, and numerical modeling communities to discuss the current status of chronologic techniques and identify future research directions. Heavily cratered terrains suggest that the inner solar system impact rate was much higher 3.8–4.4 Ga ago (1 Ga = 10 9 years). Impact rates declined after this late heavy bombardment (LHB) period to a level that has been approximately constant for the past 3.8 Ga. A major question is whether the LHB was a gradual decline or a spike near 4.0 Ga. Dynamical modeling of outer planet migrations reveals a mechanism for perturbing material into the inner solar system between 3.8 and 4.0 Ga. Geochronologic evidences from the Moon, Earth, and asteroids also support a cataclysmic LHB.
Type of Medium:
Online Resource
ISSN:
0096-3941
,
2324-9250
DOI:
10.1029/2007EO180005
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2007
detail.hit.zdb_id:
24845-9
detail.hit.zdb_id:
2118760-5
detail.hit.zdb_id:
240154-X
SSG:
16,13
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