Magnetostratigraphic dating of shallow-water carbonates from Mururoa atoll, French Polynesia: implications for global eustasy

Details Magnetostratigraphic dating of shallow-water carbonates from Mururoa atoll, French Polynesia: implications for global eustasy Magnetostratigraphic dating of shallow-water carbonates from Mururoa atoll, French Polynesia: implications for global eustasy

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..97..102a&link_type=abstract

Earth and Planetary Science Letters, Volume 97, Issue 1-2, p. 102-112.

Computer Science

13

Scientific paper

Magnetostratigraphic results are reported from a core penetrating the top 100 m of Mururoa atoll, French Polynesia. The sequence of polarity reversals, based on relative up-down direction in the unoriented core, is correlated to the geomagnetic polarity time-scale from the Gauss (early Pliocene) through the Brunhes chron (late Pleistocene-Holocene). The polarity sequence is matched with the help of an early Brunhes radiometric date in a nearby core and the projected level of Gephyrocapsa oceanica (mid-Brunhes) from an adjacent inclined core. Rock-magnetic tests and extraction of magnetic components suggest a mixture of single- and multi-domain magnetite or maghemite carries the magnetic remanence. Newly refined atoll chronostratigraphy indicates a punctuated growth history and variable sedimentation rate of the reefal rim. Magnetostratigraphically dated periods of low accumulation correspond well with the increased frequency of subaerial exposure horizons. These new data suggest that third-order scale (1 m.y.) sea-level events are recorded in reefal deposits on moderate to slowly subsiding atolls. Mururoa and the Bahamian island of San Salvador have similar accumulation curves suggesting a global eustatic control.

Affiliated with

Also associated with

No associations

Rating

Magnetostratigraphic dating of shallow-water carbonates from Mururoa atoll, French Polynesia: implications for global eustasy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetostratigraphic dating of shallow-water carbonates from Mururoa atoll, French Polynesia: implications for global eustasy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetostratigraphic dating of shallow-water carbonates from Mururoa atoll, French Polynesia: implications for global eustasy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1841857