This article describes and discusses the dedolomitization developed along joints of two outcrops of limy dolomite (Middle Ordovician). The maximum width of the two dedolomitized zones reaches 20 cm and 7 cm respectively. According to the occurrence and other evidences of dedolomitization, it is supposed that the dedolomitization resulted from the action of sub-recont near-surface vadose water. The rock fabrics produced by dedolomitization are characterized by: (1) replacement of the surrounding dolomite by the calcite, by which the dolomite may either remain as a small inclusion or disappeared altogether; (2) the contact boundaries of calcite crystals are at first sinuous, intersecting each other, but later on, the calcite crystals are gradually recrystallized with perfect crystal faces. In fact, this kind of dedolomitization may be regarded as a metaso-replacement-recrystalization under normal pressure and temperature.
. 1979, 近期表层渗流水作用下的去白云化作用. 地质科学, 14(4): 378-384.
. RECENT DEDOLOMITIZATION IN THE VADOSE ZONE[J]. Chinese Journal of Geology, 1979, 14(4): 378-384.