- 责任者：Huang Sijing (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; CDUT ; Chengdu 610059 ; China) ; Lv Jie
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(8)
- 关键词：白云岩 ; dolostone ; 四川盆地 ; Sichuan Basin
- 页码：p.2253-2262
- 图表：6 illus., 3 tables, 25 refs.
- 分类号：0803
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
The fabric-preserving dolomites are well developed in Upper Permian-Triassic carbonates in northeastern Sichuan basin, including predominantly finer planar euhedral to subhedral dolomite crystals. The distribution model of dolomite content of Qixia Formation in western Sichuan basin could be regard as a non-classical one, because the transitional rock type of 40% to 60% dolomite content is dominant; whereas the model of Changxing Formation of Upper Permian-Triassic dolomite in northeastern Sichuan basin could be seen as a classical one that has two dominant end-member rock types of more than 90% or less than 10% dolomite content respectively. The different dolomite textures could reflect the Qixia dolomite experienced the higher crystallization temperature, the lower Mg/Ca ratio of fluids and the shorter duration and incomplete halfway back dolomitization. In contrast, the Upper Permian-Triassic dolomite in northeastern Sichuan basin underwent the complete dolomitization with lower temperatures and marine-derived fluids of high Mg/Ca ratio.