作者:冯冲;王清斌;代黎明;郭龙龙;卢欢; 时间:2017-01-01 点击数:
冯冲;王清斌;代黎明;郭龙龙;卢欢;
1:中海石油(中国)有限公司天津分公司
摘要(Abstract):
为揭示渤海湾盆地秦南凹陷石东陡坡带秦皇岛29-A构造沙河街组一段陆相混积岩的形成条件和发育规律,在对混积岩岩石学分析基础上,利用元素地球化学方法,研究秦皇岛29-A构造地球化学特征、沉积环境和物源类型。结果表明:该构造B、Sr/Ba、Sr/Cu和Th/U等元素地球化学指标反映混积岩发育于干旱气候条件下的半咸水弱氧化沉积环境;为Ti/Zr、Cr/Zr低,LREE富集,HREE亏损的稀土元素配分模式,反映陆源碎屑以中酸性火成岩为主;MgO、CaO与SiO_2质量分数呈明显的负相关关系,揭示碳酸盐发育明显受陆源碎屑输入量控制,碳酸盐组分发育于陆源碎屑供给的间歇期;δEu正异常和较高的包裹体均一温度揭示它受到热液改造作用。研究区混积岩是以酸性火山岩为母岩的扇三角洲在陆源碎屑供给间歇期、于水体咸化浓缩蒸发环境下形成的,并且后期受到深部热液改造作用。
关键词(KeyWords):地球化学特征;陆相混积岩;沙河街组一段;石东陡坡带;秦南凹陷
Abstract:
Keywords:
基金项目(Foundation):国家科技重大专项(2016ZX05024-003-005)
作者(Author):冯冲;王清斌;代黎明;郭龙龙;卢欢;
Email:
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