The limestone exhibits bedding parallel irregular microstylolite seams.
The limestone also exhibits microstylolite set and the insoluble materials and mineral grains are often concentrated along the stylolite seams (Fig.
The diagenetic fabric of the Lockhart Limestone is characterized by several diagenetic features such as micritization, neomorphism (aragonite to calcite transformation and development of microspar), compaction, pressure dissolution (microstylolites
) and cementation (calcite filled microfractures).
Features interpreted to be microstylolites are locally present sub-parallel to [S.sub.0], but could also be crenulated graphite layers.
In thin section, the Ss fabric is a crenulation deavage of [S.sub.1] enhanced by pressure solution and microstylolites. Within mica-rich layers, [S.sub.2] forms tight to isoclinal crenulations of S1 that are parasitic to mm-scale folds of [S.sub.0] and [S.sub.1] (Fig.
Depending on the interaction of these factors, pressure solution in carbonates commonly begins perhaps within 200 to 300 m of burial, with the first microstylolites forming at minimum depths of ca.
Fabricius, I.L., 2000, Interpretation of burial history and rebound from loading experiments and occurrence of microstylolites in mixed sediments of Caribbean Sites 999 and 1001, in Leckie, R.M., Sigurdson, H., Acton, G.D., and Draper, G.
with insoluble residue are present in some samples while sparry calcite-filled hairline fractures are common.
The diagenetic fabric of this facies is characterized by calcite lled fractures, microstylolites
and micritized bioclasts and recrystallized fossil fragments (Plate 2; Figs.
The resulting feature called as iden which is densely packed and bounded by irregular to anastomising microstylolites
formed by selective pressure dissolution of grains (Logan and Semeniuk 1976).
While the diagenetic history is characterized by several diagenetic features of aragonite to calcite transformation compaction pressure dissolution (microstylolites) calcite-filled microfractures development of microspar micritization and nodularity.
The resulting feature called as iden is densely packed and bounded by irregular to anastomising microstylolites. In the Lockhart Limestone these idens are large tests of foraminifera and other skeletal allochems which have undergone partial dissolution along microstylolites (Plate 2A).