CAJ | 학술논문

提以系统的岩石学及中上寒武统3条剖面地球化学特征对比分析为基础，认为中上寒武统白云岩主要形成于埋藏早期高盐度卤水的渗透回流交代作用，次为混合水交代成因，其主要依据体现在：①中上寒武统白云岩及灰岩Sr/Ba总体较高，仅少量数据点Sr/Ba小于1；②灰岩Na、K含量较高，灰岩Na含量高于淡水成因的美国Wisconsin中奥陶统Mifflm Member灰岩以及美国Tennessee东部Tongling地区上奥陶统灰岩，白云岩Na含量与开宁盆地巴洼阶地潮上萨布哈白云岩中Na含量相近；③m值反映出灰岩为海水沉积环境，白云岩为与潟湖相关的沉积环境；④B校值反映出该区白云岩及灰岩主要形成于咸水-半咸水沉积环境，局部受淡水作用影响。该区白云岩化过程中Sr有明显带出现象，Na、K可能也有带出现象。
제이계통적암석학급중상한무통3조부면지구화학특정대비분석위기출，인위중상한무통백운암주요형성우매장조기고염도서수적삼투회류교대작용，차위혼합수교대성인，기주요의거체현재：①중상한무통백운암급회암Sr/Ba총체교고，부소량수거점Sr/Ba소우1；②회암Na、K함량교고，회암Na함량고우담수성인적미국Wisconsin중오도통Mifflm Member회암이급미국Tennessee동부Tongling지구상오도통회암，백운암Na함량여개저분지파와계지조상살포합백운암중Na함량상근；③m치반영출회암위해수침적배경，백운암위여석호상관적침적배경；④B교치반영출해구백운암급회암주요형성우함수-반함수침적배경，국부수담수작용영향。해구백운암화과정중Sr유명현대출현상，Na、K가능야유대출현상。
Based on petrological and geochemical analysis of middle-upper Cambrian dolomite in three different profiles, the authors hold that the dolomite was mainly formed by brine reflux dolomitization in the early bury period, together with mixing water replacement. The evidence obtained is as follows:①the ratios of Sr/Ba in dolomite and calcite are high, with only a few data being lower than 1;②the values of Na and K are high in calcite, the content of Na in calcite is higher than that of middle Ordovician Mifflm Member calcite in Wisconsin and that of upper-Ordovician calcite in Tongling of eastern Tennessee characterized by fresh water origin, and the content of Na in dolomite is equal to that of Sabkha dolomite in Barbwire terrace of Canning basin; ③ the values of m suggest that the calcite was in a seawater sedimentary environment, and the dolomite was in a lagoon sedimentary environment;④the values of revised B show that the calcite and dolomite were formed in salt and semi-salt water, partly affected by fresh water. The Sr values were impoverished during the dolomitization, and Na and K might also have been impoverished in this process.