Origin of zeolite cements in the Miocene sandstones, North Tejon oil fields, California

초록

Zeolite cement zoning from heulandite via heulandite + laumontite to laumontite occurs at the depth range from 2703-2743 m (present temperature range: 90-92°C). Heulandite and minor smectite forms together from the dissolution of volcanic glass during early diagenesis. At depths shallower than 2743 m, early laumontite forms directly at the expense of heulandite. Clay mineral transitions from smectite via mixed-layer clay minerals (C/S or I/S) to chlorite or illite probably produced the H<inf>4</inf>SiO<inf>4</inf> necessary for the reaction. -from Authors