Argentine Precordillera: Sedimentary and Plate Tectonic by Martin Keller

By Martin Keller

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Additional info for Argentine Precordillera: Sedimentary and Plate Tectonic History of a Laurentian Crustal Fragment in South America (Special Paper (Geological Society of America))

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The middle ramp is the zone between fair-weather wave base and storm wave base. Tempestites are common in this segment and proximal-distal trends are usually recognized (Aigner, 1982, 1985; Burchette and Wright, 1992). In the San Juan Formation, the wackestone-intraclast-packstone and the wackestoneoncolite associations were deposited on the middle part of the ramp (Fig. 25). The outer ramp shows much less evidence of storm influ- ence because it is located below storm wave base. In the San Juan Formation, both nodular wackestone intervals as well as the nodular packstone association are outer ramp deposits (Fig.

Other constituents of the oolite association are thrombolites and microbial mounds, which grew in subtidal areas and were onlapped by the carbonate sands. The giant stromatolites described by Dill et al. (1986) from tidal channels in the Exuma Sound (Bahamas) are a recent counterpart. The microbial-boundstone association with its laminites, abundant mudstones, and its associated sedimentary structures is interpreted to be of higher intertidal to supratidal origin (Fig. 19). This is shown by the growth forms of the laminites and stromatolites, mudcracks, birdseyes, and evaporite pseudomorphs.

In addition, the intermound sediment is also mainly coarse-grained packstone, grainstone, and rudstone, indicating that this shallow subtidal area was within the range of currents and tides (Fig. 25). The upper interval also records a high-energy environment. 43 Rigid stromatoporoid patch reefs are surrounded by well-sorted pelmatozoan grainstone with abundant tidal channels and rippledrift cross-bedding. Lateral variations are biostromes in which the stromatoporoids are found in a grainstone matrix (Don Braulio section), but also in a wackestone-packstone matrix (Puesto de los Potrerillos section).

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