CAJ | 학술논문

燕山地区中元古界高于庄组-雾迷山组主要为海相碳酸盐岩潮坪相沉积,按潮汐作用可划分为潮上带、潮间带和潮下带3个沉积相带.对研究区112件碳酸盐岩碳、氧同位素样品进行了测试和原始性验证,认为其原始组分保存良好.并根据地质统计学原理,探讨不同沉积相带碳、氧同位素的分布规律,结果表明:δ~(13)C值变化范围为-2.2‰～1.6‰,均值为-0.1‰;δ~(18)O值在-9‰～2.3‰之间变化,均值为-5.53‰.进一步对不同沉积相带主要分布区间进行统计,得出潮上带δ~(13)C值为-1.5‰～-0.5‰,δ~(18)O值为-6‰～-4‰,Z值(古盐度)为120～125;潮间带δ~(13)C值为-0.5‰～1‰,δ~(18)O值为-8‰～-4‰,Z值为123～127;潮下带δ~(13)C值为0～1.5‰.分析认为:沉积环境从潮上带→潮间带→潮下带,δ~(13)C值、Z值呈升高趋势,δ~(18)O值呈降低趋势.δ~(13)C值主要受有机碳氧化与有机碳的埋藏速率因素影响;δ~(18)O值主要受海平面升降变化影响,与之呈负相关关系;Z值同时反映碳、氧同位素组成,且更受碳同位素的影响.
연산지구중원고계고우장조-무미산조주요위해상탄산염암조평상침적,안조석작용가화분위조상대、조간대화조하대3개침적상대.대연구구112건탄산염암탄、양동위소양품진행료측시화원시성험증,인위기원시조분보존량호.병근거지질통계학원리,탐토불동침적상대탄、양동위소적분포규률,결과표명:δ~(13)C치변화범위위-2.2‰～1.6‰,균치위-0.1‰;δ~(18)O치재-9‰～2.3‰지간변화,균치위-5.53‰.진일보대불동침적상대주요분포구간진행통계,득출조상대δ~(13)C치위-1.5‰～-0.5‰,δ~(18)O치위-6‰～-4‰,Z치(고염도)위120～125;조간대δ~(13)C치위-0.5‰～1‰,δ~(18)O치위-8‰～-4‰,Z치위123～127;조하대δ~(13)C치위0～1.5‰.분석인위:침적배경종조상대→조간대→조하대,δ~(13)C치、Z치정승고추세,δ~(18)O치정강저추세.δ~(13)C치주요수유궤탄양화여유궤탄적매장속솔인소영향;δ~(18)O치주요수해평면승강변화영향,여지정부상관관계;Z치동시반영탄、양동위소조성,차경수탄동위소적영향.
Mesoproterozoic Gaoyuzhuang -Wumishan Formation in Yanshan Region were mainly marine carbonate tidal-flat facies and could be divided into supratidal zone, intertidal zone and subtidal of three sedimentary facies according to the tidal effects. Through 112 pieces of samples of carbonate and oxygen isotope were tested and the original validation was carried out. It is considered that their original components are well-preserved. And in accordance with the principles of geostatistics, the distribution of the different sedimentary facies of carbon and oxygen isotope is studied. The results indicate that the δ~(13)C value changes are between 2. 2 ‰ and 1. 6 ‰,and the average value is 0. 1 ‰; the δ~(18)O values are from -9 ‰ to 2. 3 ‰,and the average value is 5. 53 ‰. After statistics are further made on the main distribution law of different sedimentary facies,the result shows that the δ~(13)C value is from -1. 5 ‰ to 0. 5 ‰, the δ~(18)O value is from -6 ‰ to -4 ‰,and the Z value is from 120 to 125; the δ~(13)C value is from -0. 5 ‰ to 1 ‰, the δ~(18)O value is from -8 ‰ to -4 ‰, and the Z value is from 123 to 127 in the intertidal zones the δ~(13)C value is from 0‰ to 1. 5 ‰ in the subtidal zone. Analysis shows that the δ~(13)C and Z value are tended to increase and the δ~(18) O value decreases in the dcpositional environment which is from the supratidal zone intertidal-subtidal zone. The δ~(13) C value is mainly affected by oxidation of organic carbon and organic carbon burial rate factors; the δ~(18)O value is mainly affected by the sea-level change which is negatively correlated with carbon isotope; the Z values reflect the carbon and oxygen isotopic composition, and are more affected by carbon isotope.