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Zeolite to prehnite-pumpellyite facies metamorphism in the Toa Baja drill hole, Puerto Rico

Journal Article · · Geophysical Research Letters (American Geophysical Union); (United States)
DOI:https://doi.org/10.1029/91GL00409· OSTI ID:5597807
 [1]
  1. Stanford Univ., CA (United States)
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Secondary mineral assemblages in Eocene volcanic and volcaniclastic rocks of the Toa Baja drill hole progressively change as a function of depth. Four metamorphic zones are delineated with increasing depth: Ca-clinoptilolite{yields}heulandite{yields}laumontite{yields}prehnite-pumpellyite zone. The deepest belongs to the prehnite-pumpellyite facies, whereas the three zones at shallower depths (< 2,350 m) belong to the zeolite facies. Ca-clinoptilolite and heulandite exhibit continuous solid solution with varying Si/Al (2.9-5.2) and Ca/(Ca + Na + K) ratios (0.45-0.89). Pumpellyites are characterized by extensive variation in the Fe/(Fe + Al + Mg) ratio (0.29-0.74) and extreme Fe-enrichment in the laumontite zone. Temperatures estimated from mineral assemblages and facies transitions suggest that the North Coast Basin, Puerto Rico, has been subject to a metamorphic field gradient of {approximately}50 to 70C/km.

OSTI ID:
5597807
Journal Information:
Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 18:3; ISSN 0094-8276; ISSN GPRLA
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
&amp; Exploration
58 GEOSCIENCES
580000* -- Geosciences
CHEMISTRY
DEPTH
DEVELOPED COUNTRIES
DIMENSIONS
GEOCHEMISTRY
GEOLOGIC DEPOSITS
GREATER ANTILLES
IGNEOUS ROCKS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISLANDS
LATIN AMERICA
LITHOLOGY
MATERIALS
METAMORPHISM
MINERAL RESOURCES
MINERALOGY
MINERALS
NORTH AMERICA
PETROLEUM DEPOSITS
PHASE TRANSFORMATIONS
PUERTO RICO
RESERVOIR TEMPERATURE
RESOURCES
ROCKS
SILICATE MINERALS
USA
VOLCANIC ROCKS
WEST INDIES
ZEOLITES