石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (6): 1307-1320.doi: 10.11743/ogg20210606
董庆民1,2(), 胡忠贵3, 陈世悦1,2,*(), 李世临4, 蔡家兰4, 朱宜新4, 张玉颖5
收稿日期:
2020-05-27
出版日期:
2021-12-28
发布日期:
2021-12-16
通讯作者:
陈世悦
E-mail:416648529@qq.com;chenshiyue@vip.sina.com
作者简介:
董庆民(1993-), 男, 博士研究生, 沉积学及层序地层学。E-mail: 基金资助:
Qingmin Dong1,2(), Zhonggui Hu3, Shiyue Chen1,2,*(), Shilin Li4, Jialan Cai4, Yixin Zhu4, Yuying Zhang5
Received:
2020-05-27
Online:
2021-12-28
Published:
2021-12-16
Contact:
Shiyue Chen
E-mail:416648529@qq.com;chenshiyue@vip.sina.com
摘要:
碳、氧同位素是碳酸盐岩研究的重要地化指标之一,在反映全球气候变化、海平面升降变化、成岩作用影响及进行地层对比等方面发挥着重要作用。基于川东北地区野外剖面考察、岩石薄片鉴定和微量元素分析,结合长兴组-飞仙关组241件碳酸盐岩样品的碳、氧同位素组成,建立同位素演化曲线,重点对碳、氧同位素地球化学响应特征进行区域性对比分析,进一步对其地质意义进行试验性探讨。研究结果表明:川东北地区长兴期碳同位素演化曲线与海平面变化呈明显的正相关关系,并可与层序内部体系域进行良好对应,该时期氧同位素组成呈相对稳定趋势;在二叠系/三叠系界线附近碳、氧同位素值均发生强烈负漂移,达到最低值;进入飞仙关期后碳同位素值进入低幅波动的恢复阶段,在飞四段内部达到极大值后降低,氧同位素组成在飞仙关期也较为稳定。碳、氧同位素值在二叠系/三叠系界线处发生强烈负漂移可能与甲烷释放及火山喷发事件有密切关系。
中图分类号:
图2
川东北地区长兴组-飞仙关组主要岩石类型 a.泥晶含生屑砂屑灰岩,砂屑较为发育,羊鼓洞剖面,长兴组,普通染色薄片(-);b.泥晶生屑灰岩,渡口剖面,生屑可见蜓类等,长兴组,普通染色薄片(-);c.海绵骨架礁灰岩,骨架间被方解石充填,盘龙洞剖面,长兴组;d.骨架礁云岩,造礁生物以水螅为主,盘龙洞剖面,长兴组;e.海绵礁云岩,可见海绵体腔孔,盘龙洞剖面,长兴组;f.海绵障积礁灰岩,造礁生物以海绵为主,温泉003-X2井,长兴组,埋深3 298.50 m,岩心照片;g.含粒屑残余鲕粒白云岩,溶洞发育,七里北1井,飞仙关组,埋深5 830.06 m,岩心照片;h.亮晶鲕粒云质灰岩,白云石主要交代鲕粒核心,云阳沙市剖面,飞仙关组,普通染色薄片(-);i.细晶白云岩,白云石晶形完好,晶间孔较发育,新兴1井,飞仙关组,埋深3 277.18 m,铸体染色薄片(-)"
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