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Leckie, R.M., Sigurdsson, H., Acton, G.D., and Draper, G. (Eds.), 2000 Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 165
 

Summary: Leckie, R.M., Sigurdsson, H., Acton, G.D., and Draper, G. (Eds.), 2000
Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 165
149
9. PALEOLATITUDE OF THE CARIBBEAN PLATE SINCE THE LATE CRETACEOUS1
Gary D. Acton,2
Bruno Galbrun,3
and John W. King4
ABSTRACT
We used paleomagnetic results from Sites 998, 999, 1000, and 1001 to estimate the paleolatitude of the Caribbean region
over the past 80 m.y. The data include remanence measurements of split-core sections (typically 1.5 m long) and discrete sam-
ples (612 cm3 in volume) from volcanic and sedimentary rocks. From these, we computed 15 new paleolatitude estimates for
Sites 999 and 1001 on the Caribbean plate and three new paleolatitude estimates for Site 998 on the Cayman Rise, currently on
the southern North American plate. One estimate from Site 1001 is based on 230 measurements made along split-core sections
of basalt after demagnetization of 2025 mT. The other 17 estimates are based on principal component analysis of demagneti-
zation data from 438 discrete paleomagnetic samples from sedimentary units. Where necessary, the 18 new paleolatitude esti-
mates are corrected for a polarity ambiguity bias that occurs when averaging paleomagnetic data from drill cores that have
shallow inclinations and are not azimuthally oriented. We also investigated the contribution of additional biases that may arise
from a compaction-related inclination error, which could affect the sedimentary units, though not the basalt units. Several lines
of evidence, including the lack of a correlation between porosity (or water content) and inclination, indicate that the inclination
error is small, if present at all.

  

Source: Acton, Gary - Department of Geology, University of California, Davis

 

Collections: Geosciences