Sr-isotopic variation in the Quaternary: The record from glacial and interglacial marine terraces

Conference · Tue May 01 04:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:6699739

Ludwig, K R; Muhs, D R; Simmons, K R; Szabo, B J; Moore, J G ^[1]

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1. Geological Survey, Denver, CO (USA)

The authors report high-precision Sr isotope of aragonitic fossils from Pleistocene marine terraces, which formed during both glacial and interglacial periods, to (1) constrain the marine Sr-isotope trend for the late Quaternary, and (2) test the long-term marine Sr-isotope trend for reversals related to glacial-interglacial transitions. Analyses of multiple samples of mollusks from each of 15 interglacial terraces on San Nicolas Island, San Clemente Island, and the Palos Verdes Hills (California) define a marine Sr-isotope trend (assigning terrace ages based on an assumption of constant long-term uplift rates calculated from the height of dated 120-Ka terraces) that is generally similar to the trend defined by the data of recent workers for DSDP samples. Data for three U-series dated interglacial terraces on the East Coast of the US plot close to the California trend, as do data for 14 coral samples of 0-750 Ka age (dated by mass-spectrometric {sup 234}U/{sup 238}U) from submerged, glacial-stage reefs off Hawaii. As a whole, their data indicate an approximately linear increase of approximately 0.05 % in {sup 87}Sr/{sup 86}Sr over the last 800 k.y., confirm the presence of a subtle ({approximately}0.01 %) reversal between approximately 900 and 600 Ka, and resolve a previously unrecognized reversal of approximately 0.02{per thousand} between approximately 1,400 and 1,200 Ka. In addition, the lack of obvious fine structure in samples younger than 800 ka indicates that the amplitude of any short-period oscillations (<100 ky.) in the marine {sup 87}Sr/{sup 86}Sr trend for the Late Quaternary is probably less than approximately 0.02{per thousand}.

• OSTI ID: 6699739
• Report Number(s): CONF-900605--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 74:5
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CENOZOIC ERA
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FOSSILS
GEOLOGIC AGES
HEAVY ION DECAY RADIOISOTOPES
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAGNESIUM 28 DECAY RADIOISOTOPES
MINERALS
NEON 24 DECAY RADIOISOTOPES
NUCLEI
OXYGEN COMPOUNDS
QUATERNARY PERIOD
RADIOISOTOPES
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
URANIUM 234
URANIUM 238
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES