تشخيص التغيير المبكر الكربونات الجوراسية وتأثيره على نسيج الصخور ، خليج فندي ، كندا

The rocks of Scots Bay Formation occur only along the south shore of the Bay of
Fundy where they are exposed in small coves from east of Baxters Harbour to west of
Scots Bay, Nova Scotia. Lithologically, the Scots Bay Formation is dominated by clastic
sediments, including sandstone, silty sandstone, conglomertic sandstorm, and shale.
Carbonate and silicified carbonate rocks include calcareous sandstone, packstone,
mudstone, wackcstone, and stromrtolitic limestone. Jasperoid chert nodules and bedded
cherts are common throughout much of the formation .
The intense shallow burial diagenesis resulted in extensive cementation, recrystallization and authigenic
silica mineralization which cause low values of porosity/permeability throughout the carbonate sectionof
Scots Bay Formation.
Phreatic and vadose meteoric cements make up most of the cements of Scots Bay
lirnestones. Three types of calcite cement occur in the Scots Bay Formation : drusy
mosaic, blocky, and minscus cement. The chert is principally diagenetic in origin and
consists of chalcedony and mirocrystalline quartz that formed as pore filling cement and
replacements of carbonate sediments and calcareous fossils. The source of the silica was
hot-spring fluids associated with the underlying basaltic volcanic flows