Rb-Sr and Sm-Nd isotopic characterization of Eocene volcanic and volcaniclastic rocks from Puerto Rico

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/91GL00400· OSTI ID:5399657

Frost, C D ^[1]; Schellekens, J H ^[2]

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1. Univ. of Wyoming, Laramie (United States)
2. Univ. of Puerto Rico, Mayaguez (Puerto Rico)

Sm-Nd and Rb-Sr data are presented for six volcanic and volcaniclastic samples from the Eocene belt and the Toa Baja drill hole of Puerto Rico in order to provide a preliminary isotopic description of Greater Antilles arc rocks. The lava samples have trace and rare earth element compositions typical of island arc rocks. The isotopic compositions of the volcaniclastic samples are displaced from those of the lavas, and suggest that they include an authigenic or detrital crustal component. The similarity of Sr and Nd isotopic ratios of Puerto Rican lavas and northern Lesser Antilles volcanic rocks suggests that they may have been produced from similar magma sources.

• OSTI ID: 5399657
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Vol. 18:3; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
02 PETROLEUM
PETROLEUM DEPOSITS
EXPLORATION
PUERTO RICO
VOLCANIC ROCKS
ISOTOPE RATIO
EOCENE EPOCH
EXPLORATORY WELLS
GEOCHEMISTRY
LAVA
NEODYMIUM ISOTOPES
ORIGIN
RARE EARTHS
RUBIDIUM ISOTOPES
SAMARIUM ISOTOPES
SAMPLING
STRONTIUM ISOTOPES
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
CENOZOIC ERA
CHEMISTRY
DEVELOPED COUNTRIES
ELEMENTS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GREATER ANTILLES
IGNEOUS ROCKS
ISLANDS
ISOTOPES
LATIN AMERICA
METALS
MINERAL RESOURCES
NORTH AMERICA
RARE EARTH ISOTOPES
RESOURCES
ROCKS
TERTIARY PERIOD
USA
WELLS
WEST INDIES
580000* - Geosciences
020200 - Petroleum- Reserves
Geology
& Exploration