鄂尔多斯盆地奥陶系马家沟组五段富铁白云石成因

doi:10.11743/ogg20170414

Abstract

Abstract: According to the crystalline form and size,dolostones from the 5^th member of the Ordovician Majiagou Formation,Ordos Basin,can be divided into two types:M-type microcrystalline dolostone and F-type silt-to-fine-sized crystalline dolostone. Both types have a high Fe content. However,Fe is not uniformly distributed in the two types of dolostonees. In the M-type dolostone,the matrix dolomite has a Fe content of 583×10^-6 to 3 811×10^-6 and the iron-rich dolomite mainly occurs as filling material in dissolved mold pores,the coarse crystalline pore-filling dolomites have a Fe content of 29 112×10^-6 to 47 148×10^-6 and the Fe is evenly distributed in the crystalline,and the silt-sized crystalline pore-filling dolomites have a Fe content up to 81 752×10^-6,and the Fe concentrate only at the edge of the dolomites. In the F-type dolostones,the matrix has a Fe content of 233×10^-6 to 2 007×10^-6,dolomites filled up fractures and pores have an evenly distributed Fe with a content up to 9 178×10^-6. There might be a correlation between the Fe enrichment and pore development. Well-developed pores generally mean higher concentration of Fe. The value ranges of δ¹³C(V-PDB) and δ¹⁸O(V-PDB) of the M-type microcrystalline dolomites are -3.5‰ to 1.4‰ and-6.5‰ to -8.0‰,respectively. Those of silt-sized crystalline pore-filling dolomites are -0.7‰ to -2.7‰ and -9.8‰ to -11.5‰,and those of coarse crystalline pore-filling dolomites are -1.7‰ to -2.9‰ and -9.9‰ to -11.3‰,indicating possible influences of hydrothemal fluids. The value ranges of δ¹³C(V-PDB) and δ¹⁸O(V-PDB) of the F-type are -0.4‰ to -0.8‰ and -5.3‰ to -6.6‰.The two types may have their Fe derived from the overlying ferruginous clay rocks. After long exposure to weathering and erosion,the dolomites harbored a large number of pores with some residual overburden of ferruginous clay rocks,from which Fe-rich fluids migrated downward by gravity during burial process,and Fe³⁺ was transformed into F²⁺ when the fluid reaches a certain temperature and depth making it easier for F²⁺ to enter into dolomite lattice and forming iron-rich dolomites.

Key words: pore, iron-rich dolomite, Majiagou Formation, Ordovician, Ordos Basin

CLC Number:

TE121.3

Zhang Juntao, He Zhiliang, Yue Xiaojuan, Sun Yipu, Jin Xiaohui, Chen Xia. Genesis of iron-rich dolostones in the 5th member of the Majiagou Formation of the Ordovician in Ordos Basin[J]. Oil & Gas Geology, 2017, 38(4): 776-783.

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Genesis of iron-rich dolostones in the 5th member of the Majiagou Formation of the Ordovician in Ordos Basin

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