CAJ | 학술논문

白垩状结构碳酸盐岩是一种白色或淡色疏松、酥脆、多微孔的灰岩.狭义自垩状结构灰岩是指深水盆地、陆棚斜坡及内台地局限海(如潟湖)相中形成的白垩状微孔隙灰泥岩及粒泥岩.广义白垩状结构灰岩指盆地相和陆棚相中包括生物礁、滩的各种沉积体内各种沉积组构产生的白垩状灰岩,也包括白垩状去白云化灰岩及(真)白垩.综合各国学者的有关研究资料,建议将白垩状结构化定义为:"碳酸盐沉积物和碳酸盐岩中的镁方解石和文石在不同成岩阶段通过新生变形而转变成低镁方解石微晶和微亮晶格架,并在其中产生和保存晶间孔喉网络的作用;强化白垩状结构化是指微晶和微亮晶格架受到进一步溶蚀和淋滤,从而形成次生溶蚀孔隙网络的作用".论述了世界各地的地史中不同成岩阶段白垩状结构碳酸盐岩成岩环境的例证和白垩状结构化成因.
백성상결구탄산염암시일충백색혹담색소송、소취、다미공적회암.협의자성상결구회암시지심수분지、륙붕사파급내태지국한해(여석호)상중형성적백성상미공극회니암급립니암.엄의백성상결구회암지분지상화륙붕상중포괄생물초、탄적각충침적체내각충침적조구산생적백성상회암,야포괄백성상거백운화회암급(진)백성.종합각국학자적유관연구자료,건의장백성상결구화정의위:"탄산염침적물화탄산염암중적미방해석화문석재불동성암계단통과신생변형이전변성저미방해석미정화미량정격가,병재기중산생화보존정간공후망락적작용;강화백성상결구화시지미정화미량정격가수도진일보용식화림려,종이형성차생용식공극망락적작용".논술료세계각지적지사중불동성암계단백성상결구탄산염암성암배경적예증화백성상결구화성인.
Chalky texture carbonate is a kind of white-or light-colored, loose, friable and porous limestone. Chalky texture limestone in a narrow sense is referred to chalky microporous mudstone and wackestone formed in deep-water basin, shelf slope and intraplatform restricted marine (such as lagoonal) environment. Chalky texture limestone in a broad sense is referred to that formed of various sedimentary fabrics of every sedimentary unit, including reefs and banks,, of shelf and basinal facies. The limestone includes chalky de-dolomitized limestone and (true) chalk. The authors have summarized relevant data studied by overseas scientists and suggested the definition of chalky texture formation as " Chalky texture formation refers to that magnesium calcite and aragonite are transformed into the framework of micrite and microspar of low-magnesium calcite via neomorphism, and result in and maintain intercrystalline pore and throat networks in it; enhanced chalky texture formation refers to that the micrite and microspar are successively subjected to dissolution and leaching, so that the secondary network of solution voids is formed".We discussed diagenetic environment cases in point of chalky texture carbonates and geneses of chalky texture, formed in different diagenetic stages in some parts of the world in the geohistory.