Mechanism of Dolomite Formation in Member Ma55 of Majiagou Formation,East of Sulige Gas Field

doi:10.11885/j.issn.1674-5086.2018.05.07.01

Abstract

Abstract: It is a matter of some dispute on the genesis of dolomite in Member Ma₅⁵ of Majiagou Formation of Ordovician, east of Sulige Gas Field, Ordos Basin. Based on the study of Sedimentary background, the characteristics of lithology and geochemistry of dolomite in this area, it is indicated that the dolomite in Member Ma₅⁵ of Majiagou Formation of this area is dominated by intertidal-subtidal sediments. There are two main types of dolomite:penecon-temporaneous dolomite and buried dolomite, and the dolomitized fluid is seawater or relevant sea-source fluid, which were established two dolomitization models:penecontemporaneous dolomite and burial dolomite. The former is maidly dolomicrite and a minority of powder crystal dolomite, it is characterized by horizontally-laminated bed, gypsum mold and bird-eye texture, and it is always coexists with gypsum crystal, mainly idiomorphic crystal, the order degree of grains is bad. The trace element analysis indicates that the contents of sodium and strontium are higher, it shows that the sedimentary environment is a strong evaporation environment with shallow water, high salinity and dry climate, which belongs to penecon-temporaneous dolomite. Buried dolomite often keeps larger particles, mainly fine-grained and medium grained dolomite, subhedron, and intergranular pores are more developed, the order degree of grains is better. It is coexists with pyrite, and it shows agglomerate or uneven distribution, The trace element analysis indicates that the contents of iron and manganese are higher, and the values of δ¹⁸O_PDB display negative distribution. These evidences indicate that the dolomite is formed by buried reduction environment, is belongs to burial dolomite.

Key words: dolomitization, Majiagou Formation, geochemistry, Ordovician, Sulige Gas Field, Ordos Basin

CLC Number:

TE121

BAI Hui, FENG Min, HOU Kefeng, YANG Tebo, GUO Siwen. Mechanism of Dolomite Formation in Member Ma₅⁵ of Majiagou Formation,East of Sulige Gas Field[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 65-73.

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Mechanism of Dolomite Formation in Member Ma₅⁵ of Majiagou Formation,East of Sulige Gas Field

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