上海国土资源
上海國土資源
상해국토자원
2015年
1期
86~89
,共null页
沉积环境 古湖泊 碳酸盐岩 碳氧同位素 高邮凹陷 阜宁组地层
沉積環境 古湖泊 碳痠鹽巖 碳氧同位素 高郵凹陷 阜寧組地層
침적배경 고호박 탄산염암 탄양동위소 고유요함 부저조지층
sedimental environment; ancient lake; carbonate rock; carbon and oxygen isotope; Gaoyou Sag; FuningFormation stratum
沉积岩中碳氧同位素值的测定在古环境恢复方面具有重要意义.本文采用苏北盆地高邮凹陷韦马地区阜宁组一段（E1f1）的13个砂岩样品,利用MAT-252型稳定同位素比质谱仪,精确测定砂岩样品中沉积的碳酸盐岩胶结物的碳氧同位素比值.样品的碳、氧同位素值均为负值,δ13C值在-2.05‰- -6.44‰之间、δ18O值在-8.33‰- -12.08‰之间,通过计算及与海相和陆相碳酸盐岩同位素值对比得出,高邮凹陷阜宁组-段沉积时期发育淡水陆相开放性湖泊,成岩温度较低,湖泊古生产力具有分段性,由深变浅,湖泊的古生产力具有由低变高的趋势.
沉積巖中碳氧同位素值的測定在古環境恢複方麵具有重要意義.本文採用囌北盆地高郵凹陷韋馬地區阜寧組一段（E1f1）的13箇砂巖樣品,利用MAT-252型穩定同位素比質譜儀,精確測定砂巖樣品中沉積的碳痠鹽巖膠結物的碳氧同位素比值.樣品的碳、氧同位素值均為負值,δ13C值在-2.05‰- -6.44‰之間、δ18O值在-8.33‰- -12.08‰之間,通過計算及與海相和陸相碳痠鹽巖同位素值對比得齣,高郵凹陷阜寧組-段沉積時期髮育淡水陸相開放性湖泊,成巖溫度較低,湖泊古生產力具有分段性,由深變淺,湖泊的古生產力具有由低變高的趨勢.
침적암중탄양동위소치적측정재고배경회복방면구유중요의의.본문채용소북분지고유요함위마지구부저조일단（E1f1）적13개사암양품,이용MAT-252형은정동위소비질보의,정학측정사암양품중침적적탄산염암효결물적탄양동위소비치.양품적탄、양동위소치균위부치,δ13C치재-2.05‰- -6.44‰지간、δ18O치재-8.33‰- -12.08‰지간,통과계산급여해상화륙상탄산염암동위소치대비득출,고유요함부저조-단침적시기발육담수륙상개방성호박,성암온도교저,호박고생산력구유분단성,유심변천,호박적고생산력구유유저변고적추세.
Carbon and oxygen isotopes have been widely used as a means of reconstructing ancient environments. A totalof 13 sandstone samples were collected from the Funing Formation （E1f1） in Gaoyou Sag, WeiMa region. A MAT-252 stableisotope ratio mass spectrometer was used to measure δ18O and δ13C in all samples. δ13C values range from .2.05‰ and.6.44‰, and the δ18O values range from .8.33‰ and .12.08‰. These values are comparable with carbonate rock marineand terrestrial isotope values, suggesting that the lakes developed into the open inland freshwater lakes in Funing Formationsedimentary period. Diagenetic tempterature is low, and the ancient productivity of the lake with piecewise sex. The ancientproductivity of the lake changed from low to high with decreasing depth.
