- Usage in publication:
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- St. Lucie Metamorphic Complex
- Modifications:
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- Named
- Dominant lithology:
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- Gneiss
- Amphibolite
- Schist
- AAPG geologic province:
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- South Florida province
Summary:
St. Lucie Metamorphic Complex, a sequence of high-grade metamorphic rocks that subcrop southeast of the Osceola Granite, has been drilled in a few wells in central FL and is identified as part of the Suwannee terrane of this report. Includes quartz diorite gneiss, amphibolite, and chlorite schist according to Bass (1969: AAPG Memoir 11, p. 283-310). Shows northwest-trending magnetic lineations. Rb-Sr age of 530 Ma (Bass, 1969) indicates approximate time equivalence with Osceola Granite. Authors state, "No formal stratigraphic nomenclature has been defined for rocks of the Suwannee terrane and no single well or group of wells has penetrated a sufficient thickness of beds for clear definition of stratigraphic sequence or contacts. Nevertheless, a general stratigraphic sequence can be compiled." . [This is not a formal proposal, but is cited as the naming paper by various authors who use this nomenclature. See also Plate 6, this volume.]
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- St. Lucie Metamorphic Complex
- Modifications:
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- Overview
- Dominant lithology:
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- Quartz diorite
- AAPG geologic province:
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- South Florida province
Summary:
St. Lucie Metamorphic Complex described as a suite of high grade metamorphic and subordinate, associated, variably deformed igneous rocks. Predominant lithologies include amphibolite, biotite-muscovite schist and gneiss, and quartz diorite. Hornblende from amphibolite cuttings taken from wells in St. Lucie and Martin Cos. yield 40Ar/39Ar ages of 511 and 513 Ma, interpreted as post-metamorphic cooling ages.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- St. Lucie Metamorphic Complex*
- Modifications:
-
- Overview
- AAPG geologic province:
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- South Florida province
Summary:
The St. Lucie Metamorphic Complex (of Thomas and others, 1989) was formerly called "Cowles metamorphic rocks" by Chowns and Williams (1983: U.S.G.S. Prof. Pap. 1313, p. L1-L41). Correlation of these rocks with part of the Rokelide orogen in Guinea was also suggested by Chowns and Williams.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).