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山东中生代火山岩年代学研究 被引量:35

Geochronology of Mesozoic volcanic rocks in Shandong province.
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摘要 山东中生代火山岩年代学研究与中国东部许多重大地质问题有直接联系。本次在胶莱盆地标准剖面系统采集了青山群各组的火山岩样品,在安丘大盛群标准剖面采集田家楼组火山岩样品,同时还采集了淄博、蒙阴、莒县等地火山岩样品,进行 K-Ar 法年龄测定,获得青山群火山岩年龄大致在118~93Ma 之间,对应于白垩纪中上部。其中,后夼组始于约117Ma,属于阿普特阶;八亩地组109~103Ma,属于阿尔布阶;石前庄组103.7~93.3Ma,位于阿尔布阶上部至赛诺曼阶,其底部与八亩地组顶部相当,可能两个组之间没有明显的间断;方戈庄组始于93.3Ma,属于上白垩统的土仑阶。鲁东莱阳盆地的八亩地组和鲁西蒙阴八亩地组火山岩年龄基本一致,说明鲁东和鲁西尽管有岩性差异,但同层位火山岩的喷发时间大致相同。大盛群田家楼组下部火山岩年龄95Ma,与石前庄组上部层位相当,说明大盛群与青山群为交叉对应关系。淄博群坊子组中的火山岩年龄120.1Ma 和105.7Ma,山东可能不存在侏罗纪火山岩。 Geochronology of Mesozoic volcanic rocks in Shandong province has direct connections with many major geological events in eastern China. In this study, volcanic rocks used for K-Ar dating are systematically sampled from four formations of Qingshan Group in the standard section of Jiaolai basin, and from Tianjialou Formation of Dasbeng Group in Anqiu, as well as from Zibo, Mengyin and Juxian area. K-Ar dating of volcanic rock samples from Qingshan group shows that the age of this group ranges from 118Ma to 93Ma, corresponding middle to upper Cretaceous, and the ages of the four formations in this group are as follows : Houkuang Formation started from about 117Ma, belonging to Aputian; Bamudi Formation 109 - 103Ma, belonging to Albian; Shiqianzhuang Formation 103.7 -93. 3Ma, seated at upper Albian to Cenomanian, its bottom is about the top of Bamudi Formation, probably no discontinuity between the two formations; and Fanggezhuang Formation started from 93.3Ma, belonging to upper Cretaceous Turonian. Although difference has been existed, the age of Bamudi Formation vocanic rock in eastern Shandong Province is about the same of that in western Shandong Province. The age of lower Tianjialou Formation in Dasheng Group is -95Ma, corresponding to upper Shiqianzhuang Formation of Qinshan Group, indicating that the two groups are crossed-correpondence. Volcanic rocks of Fangzi Formation of Zibo Group have early Cretaceous ages (107.7Ma and 120.1Ma) , indicating that Jurassic volcanic rocks may be absent in Shandong.
出处 《岩石学报》 SCIE EI CAS CSCD 北大核心 2008年第6期1333-1338,共6页 Acta Petrologica Sinica
基金 国家自然科学基金(40473004) 核资源与环境教育部重点实验室开放基金项目(070715)资助
关键词 山东 中生代 火山岩 年代学 Shandong Mesozoic Volcanic rocks Geochronology
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