Page 262 - Carbonate Platforms Facies, Sequences, and Evolution
P. 262

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                                                                                                           It
                  '
                          N
                   '
                                                                                                                               246
                                                                                                                    basin's
                     tc
                                                                                                           may
                         /
                                                            t:=3 lagoon
                                                                                                               Monterrey
                                                                 L2J �:����al
                                                                                            calcarenite
                                                                                                           be
                                                              [J littoral zone
                                                                                            is
                                                                        platform (Fig.  4)
                                                                                            the
                                                            �
                        100km
           Zacatecas
                                                                                                           distinct
                                                                                     Smackover-Zuloaga
                   ZACATECAS
                                                                                                               lineaments.
                                                                                       the Chicontepec basin.
                                                                                                           from,
                                                                                            Tepexic
                                                                                                               Salt
                                                                                                           and
                                                                                              by  basement  palaeotopography.
                                                            low-energy shelf
                                                                                                               lies
                                                                                                                    southwestern  projection,
                                                              � high-energy shoal
                                                                [J intertidal-supratidal
                                                                                                               in
                                                                                            Formation
                                                                                                               the
                                                                                                           younger
                                                                                     -Santiago-Novillo
                                                                                                  completely along the margin of the Gulf.
                                                                                                                    probably
                                                                                            which
                                                                                                           than,
                                                                                                               vicinity
                                                                                            is
                                                                                                                    filling
                                                                                                                  trough caused by  the San  Marcos and the Saltillo­
                                                                                                       These  'interior' evaporites  may  be Buckner  equiv­
                                                                                     Forma­
                                                                                                                          Kimmeridgian  but this is  not now determined.  The
                                                                                                         Callovian salt lying in the Burgos Basin to the east.
                                                                                              The  earliest  shoal
                                                                                                                        anhydrite fringe  of these  deposits trends  northwest
                                                                                                             Monterrey but west of the Lampazos-Picacho high.
                                                                                   tions which are calcarenitic.  In northeastern Mexico
                                                                                 a  regional  study  by  Oivanki  (1974) of  the  Zuloaga
                                                                            oolite facies is developed around the southern edge
                                                                                       Oxfordian  strata  consist  of
                                                                                                           the
                                                                                                Jurassic carbonate facies are also influenced locally
                                                                                         Callovian age and occurs locally in central Mexico in
                                                                                                                    a
                                                                                                    alent and may lie shelfward of extensive oolite shoals
                                                                                                                      up the Sabinas Basin and the halite facies lies in the
                                                                                                               of
                                                                                            of
                                                                              limestone indicated that the widespread Smackover
                                                                          of the Coahuila block and to the north of the Valles
                                                                                                                               J.L.
                                                                                                               by
                                                                                                                               Wilson
                                                                                     occurs
                                                                            occurs
                                                                                   islands
                                                                                                             (Meiburg
                                                                                     in
                                                                                                Farther
                                                                                                  ammonites.
                                                                                                               redbeds
                                                                            south
                                                                                                south
                                                                            to
                                                                                                             et a!.,
                                                                                   and  shoal
                                                                                                               and
                                                                                     basinal
                                                                            the
                                                                                       and  dark  argillaceous
                                                                                                             1987)
                                                                                     areas
                                                                                                             is
                                                                                                               gypsum.
                                                                                     in
                                                                                                               The
          (1974,  fig.  10).
                                                                                                             thinner,
                                                                                   areas  (Sansores  &
                                                                                     between
                                                                                                Kimmeridgian  beds
                                                                            Tuxpan-Golden
                                                                                                               lower
                                                                                                             more
                                                                            Lane
                                                                                     complexes
            northern Mexico.  From Oivanki
                                                                                                       and may be Kimmeridgian.  It is overlain by identifi­
                Fig. 4.  Oxfordian-Kimmeridgian .
                                                                                   Girard,  1969).
                                                                            high.
                                                                                                                          It is not yet clear whether the Zuloaga around the
                                                                                                                      dated or may be in part Kimmeridgian. To the south
                                                                                                                    of Galeana, around Aramberri, two limestones may
                                                                                                                        Saltillo-Monterrey area is Oxfordian as traditionally
                                                                                                                 be seen down the flanks of a local high area separated
                                                                                            the Gulf of Mexico in which shoal oolite, calcarenites
                                                                                         or patch-reefs occur in shallow water over high areas
                                                                                                (Taman-San
                                                                                              Andres-Haynesville) form a facies complex around
                                                                                 The southern part of the Tamaulipas arch breaks up
                                                                              into an irregular mosaic of island topography which
                                                                                       or  purely  micritic  limestone
                                                                                     of
                                                                          These islands may be surrounded by oolite (Fig.  5).
                                                                                                             restricted
                                                                                                               limestone
                                                                                                         be Oxfordian.  The  thick  upper  unit  is  more  oolitic
                                                                                                    able La Caja-La Casita shales with  Kimmeridgian
                                                                                                           marine and tidal flat in character, and is presumed to
              facies map of Zuloaga Formation in
                                                                        On the northern  edge  of the Tezuitlan  massif in
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