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S.G.Pemberton, ZHOU Zhi cheng, J. MacEachern. Discusses on Preservational Potential of Event Bed[J]. Acta Sedimentologica Sinica, 2001, 19(1): 7-12.
Citation: S.G.Pemberton, ZHOU Zhi cheng, J. MacEachern. Discusses on Preservational Potential of Event Bed[J]. Acta Sedimentologica Sinica, 2001, 19(1): 7-12.

Discusses on Preservational Potential of Event Bed

  • Received Date: 2000-07-06
  • Publish Date: 2001-03-10
  • The increasing awareness of tcmpcstitcs in the ancient record has correspondingly led to much consideration of their prcscrvahility.The main factors influencing the prcscrvahilitv are the net sedimentation rate Tthe hiogcnic mixing rate } and the magnitude of physical reworking. Theateroft has put forward the concept of time scales to attempt to solve this problem.The terms of transit time and dissipation time arc introduced.Transit time is related to the thickness of the hiogcnic reworking zone,the thickness of event beds and sedimentation rate.The hiogcnic reworking zone is also controlled by the animal size and the behavior engaged in during its generation.The determination of transit time is difficult because of the unstcadv and unpredictable mination of dissipation time is even more complicated than that of transit time.The dissipation time is controlled by manv factors such as the size of infauna, the behavior engaged in by the organisms, the dynamic interplay between the hcnthic community and the dcpositional event itself the dcsirahilitv of the event bed as a site for colonization and as a repository of food resources and the absolute time available for burrowing ctc.Unfortu- natelv, the preceding factors appear to resist quantification and therefore severely limit the effectiveness of existing mathcmatical models to explain tcmpcstitcs preservation in the rock record. Physical reworking of the substrate has a profound effect on the preservation of both the event hcd and the fair-wcathcr deposits.On the basis of comprehensive analyses of all factors influencing prcscrvational potential of event beds and cmpirical ohservations} both proximal upper-shorcfacc and middle-shorcfacc and distal shelf and lower offshore favor prcscr-vation of tcmpcstitcs but for markedly different reasons.The lowest prcscrvational potential for tcmpcstitcs appears to occur somewhere between the proximal and distal extremes.Such zones appear to correspond to proximal Cruziana ichnofacics suite of the upper offshore and distal portion of the lower shorcfacc.
  • [1] 1 Aigner T,Reineck H E. Proximaiity trends in modern storm sands from the Heigoiand Bight(North Sea)and their impiications for basin anaiysis[J].Senckenbergiana Maritima,1982,14:183 ~ 215

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  • Received:  2000-07-06
  • Published:  2001-03-10

Discusses on Preservational Potential of Event Bed

Abstract: The increasing awareness of tcmpcstitcs in the ancient record has correspondingly led to much consideration of their prcscrvahility.The main factors influencing the prcscrvahilitv are the net sedimentation rate Tthe hiogcnic mixing rate } and the magnitude of physical reworking. Theateroft has put forward the concept of time scales to attempt to solve this problem.The terms of transit time and dissipation time arc introduced.Transit time is related to the thickness of the hiogcnic reworking zone,the thickness of event beds and sedimentation rate.The hiogcnic reworking zone is also controlled by the animal size and the behavior engaged in during its generation.The determination of transit time is difficult because of the unstcadv and unpredictable mination of dissipation time is even more complicated than that of transit time.The dissipation time is controlled by manv factors such as the size of infauna, the behavior engaged in by the organisms, the dynamic interplay between the hcnthic community and the dcpositional event itself the dcsirahilitv of the event bed as a site for colonization and as a repository of food resources and the absolute time available for burrowing ctc.Unfortu- natelv, the preceding factors appear to resist quantification and therefore severely limit the effectiveness of existing mathcmatical models to explain tcmpcstitcs preservation in the rock record. Physical reworking of the substrate has a profound effect on the preservation of both the event hcd and the fair-wcathcr deposits.On the basis of comprehensive analyses of all factors influencing prcscrvational potential of event beds and cmpirical ohservations} both proximal upper-shorcfacc and middle-shorcfacc and distal shelf and lower offshore favor prcscr-vation of tcmpcstitcs but for markedly different reasons.The lowest prcscrvational potential for tcmpcstitcs appears to occur somewhere between the proximal and distal extremes.Such zones appear to correspond to proximal Cruziana ichnofacics suite of the upper offshore and distal portion of the lower shorcfacc.

S.G.Pemberton, ZHOU Zhi cheng, J. MacEachern. Discusses on Preservational Potential of Event Bed[J]. Acta Sedimentologica Sinica, 2001, 19(1): 7-12.
Citation: S.G.Pemberton, ZHOU Zhi cheng, J. MacEachern. Discusses on Preservational Potential of Event Bed[J]. Acta Sedimentologica Sinica, 2001, 19(1): 7-12.
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