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Structure of the Melajo clay near Arima, Trinidad and strike-slip motion in the El Pilar fault zoneNo consensus has yet emerged on the sense, timing and amount of motion in the El Pilar fault zone. As a contribution to the study of this problem, a critical area within the zone in North Central Trinidad has been mapped. On the basis of the mapping, it is concluded that the El Pilar zone has been active in right-lateral strike-slip motion during the Pleistocene. Recognition of structural styles akin to those of the mapped area leads to the suggestion that the El Pilar zone is part of a 300 km wide plate boundary zone extending from the Orinoco delta northward to Grenada. Lateral motion of the Caribbean plate with respect to South America has been suggested to amount to 1900 km in the last 38 Ma. Part of this displacement since the Miocene can be readily accommodated within the broad zone identified here. No one fault system need account for more than a fraction of the total motion and all faults need not be active simultaneously.
Document ID
19860064901
Document Type
Conference Paper
Authors
Robertson, P. (Houston, University TX, United States)
Burke, K. (Lunar and Planetary Institute, Houston; Houston, University TX, United States)
Wadge, G. (Houston Univ. TX, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS5-28139
CONTRACT_GRANT: NASW-3389
Distribution Limits
Public
Copyright
Other