Patent ID: 11879884
Assignee: CHENGDU UNIVERSITY OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The classification method for fine-grained mixed sedimentary rocks according to claim 1, wherein, a fine-grained mixed sedimentary rocks triangular diagram classification method based on mineral contents is used to classify the fine-grained mixed sedimentary rock types;
wherein three end-members of the triangular classification diagram are respectively:
(1) clay minerals end-member A, the sum of clay minerals comprising kaolinite, illite, and chlorite of clay-grade grain sizes;
(2) carbonate end-member C, comprising various carbonate minerals of chemical and biochemical origin; wherein in the fine-grained mixed sedimentary rocks, the carbonate minerals are of micritic structure, with coarser granular carbonate minerals occasionally mingled;
(3) terrigenous clastic mineral end-member S, minerals comprising quartz and feldspar; wherein in continental fine-grained mixed sedimentary rocks, the quartz and the feldspar are siltgrade grains mingled in a dispersive state, and the terrigenous clastic grains are mingled into the fine-grained mixed sedimentary rocks in a form of sandstone bands;
wherein the triangular classification diagram is used to classify 4 major categories and 18 subcategories of rock types, the 4 major categories of which are respectively carbonate, clay, sand and mixed major categories;
wherein the mixed major category belongs to the true mixed sedimentary rocks or narrow mixed sedimentary rocks; and
wherein the carbonate, clay, and sand major categories are further respectively subdivided into 5 categories according to content standards of 10%, 25%, 50%, 75% and 90% and triangular angular bisectors.