地质学报Issue(6)：165-178,14.
胶莱盆地南缘白垩系青山群火山岩地球化学特征
Geochemical Characteristics of Volcanic Rocks in Cretaceous Qingshan Group from Southern Margin of Jiaolai Basin,Shandong Province
摘要
Abstract
On the basis of the work that the regional geological survey of JiaolaiBasin southern margin was carried,the stratotype section for the volcanic rocks of Cretaceous Qingshan Group in study area was measured with system sampling.It was showed that the content of SiO2 in the volcanic rocks of Cretaceous Qingshan Group is about 51.08%~74.86%,total alkalis (Na2 O+K2 O)is about 3.2%~8.8%,Al2 O3 is about 13.18% ~ 17.3%,and TFe2 O3 is about 0.86% ~ 10.48%,after chemical analysis and data processing.The character of trace and rare earth element is that La and Nd which are LILE and LREE are relatively enriched,while Nb,P and Ti which are HFSE and HREE are relatively loss.Houkuang and Shiqianzhuang Formation have the similar geochemical characteristics that the volcanic rocks are mainly composed of acidic rocks,while Bamudi and Fanggezhuang Formation have the similar geochemical characteristics that the volcanic rocks are mainly composed of intermediate rocks.The volcanic rocks of Bamudi and Fanggezhuang Formation that erupted lately have more total alkalis than that of Houkuang and Shiqianzhuang Formation.The result of comprehensive analysis was that the volcanic rocks of Cretaceous Qingshan Group in Jiaolai Basin southern margin were intermediate-acidic rocks with peraluminous,K-rich and calc-alkaline characteristic.The magma source of the volcanic rocks that erupted in four different episodes was the same-the lower crust,the reason of which may be related with subduction of Yangtze plate.Magma evolution process of the volcanic rocks showed strong crystal fractionation.Combined with the lithological character and magma source analysis,volcanic rocks of Qingshan Group were not typical bimodal volcanic eruption.关键词
胶莱盆地/白垩纪/火山岩/地球化学/主量元素特征/微量元素特征Key words
Jiaolai Basin/Cretaceous/volcanic rocks/geochemistry/major element characteristics/trace element characteristics引用本文复制引用
付文钊,杨锋杰,周新玉,毛光周,金爱文,陈桥,姜楠,郭帮杰..胶莱盆地南缘白垩系青山群火山岩地球化学特征[J].地质学报,2014,(6):165-178,14.基金项目
本文由国家自然科学基金项目（41202083、41340026）、高校博导类基金项目（20113718110007）、山东省优秀中青年科学家奖励基金项目（BS2013HZ024）、山东省金属矿产成矿地质过程与资源利用重点实验室项目（2013003）和山东科技大学研究生科技创新基金项目（YCA120317）联合资助。 （）
