Uranium series ages of corals from the upper Pleistocene Mulege terrace, Baja California Sur, Mexico

Journal Article · Sun Feb 01 00:00:00 EST 1987 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1987)15<139:USAOCF>2.0.CO;2· OSTI ID:5237474

Ashby, J R; Ku, T L; Minch, J A

Specimens of Porites californica contained in the sediments of upper Pleistocene, +12-m marine terrace deposits developed on the east coast of the Baja California (Mexico) peninsula at Mulege have yielded /sup 239/Th//sup 234/U dates of 124 +/- 5 and 144 +/- 7 ka (+/- 1 sigma). These dates can be assigned to the well-documented late Pleistocene oxygen-isotope stage 5e high sea stand. Differences between the eustatic and present elevations of this terrace indicate average uplift rates since terrace formation of approximately 4 to 5 cm/1000 yr, indicating a relative stability and lack of major vertical deformation since the late Pleistocene. This terrace in the Mulege area can now be correlated with other marine terraces throughout the Baja California peninsula and southern California.

• Research Organization: San Diego State Univ., CA (USA)
• OSTI ID: 5237474
• Journal Information: Geology; (United States), Vol. 15:2
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC DEPOSITS
AGE ESTIMATION
MEXICO
CORALS
CORRELATIONS
DEFORMATION
GEOLOGIC HISTORY
ISOTOPE DATING
PLEISTOCENE EPOCH
STRATA MOVEMENT
THORIUM 230
URANIUM 234
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CENOZOIC ERA
CNIDARIA
DEVELOPING COUNTRIES
EVEN-EVEN NUCLEI
GEOLOGIC AGES
HEAVY NUCLEI
ISOTOPES
LATIN AMERICA
NORTH AMERICA
NUCLEI
QUATERNARY PERIOD
RADIOISOTOPES
THORIUM ISOTOPES
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
580100* - Geology &amp; Hydrology- (-1989)