鲁东胶莱盆地青山组火山岩的^40Ar—^39Ar定年——以五莲分岭山火山机构为例

鲁东胶莱盆地青山组火山岩的^40Ar—^39Ar定年——以五莲分岭山火山机构为例

邱检生1 2，王德滋2，罗清华3，刘洪2

1. 南京大学内生金属矿床成矿作用国家重点实验室，南京 210093; 2. 南京大学地球科学系，南京 210093; 台湾大学地质系，台北 106-17

收稿日期:2001-09-20 修回日期:2001-09-20 出版日期:2001-09-20 发布日期:2001-09-20

40Ar-39Ar Dating for Volcanic Rocks of Qingshan Formation in Jiaolai Basin，Eastern Shandong Province: A Case Study of the Fenlingshan Volcanic Apparatus in Wulian County

QiU Jian-sheng1;2，WANG De-zi2，LO Qing-Hua3，LIU Hong2

1. State Key Laboratory for Mineral Deposit Research, Nanjing University，Nanjing 210093; 2. Department of Earth Sciences，Nanjing University，Nanjing 210093; 3. Department of Geology National Taiwan University，Taibei106-17

Received:2001-09-20 Revised:2001-09-20 Online:2001-09-20 Published:2001-09-20

摘要/Abstract

摘要： 以五莲分岭山火山机构为例，运用高精度的^40Ar－^39Ar定年技术，对胶莱盆地青山组火山岩的形成年龄进行了精确测定。结果表明。青山组第一旋回中偏碱性富钾火山岩的形成年龄为109．9±0．6Ma，第二旋回酸性流纹质火山岩形成年龄为108．2±0．6Ma，据此确定胶莱盆地青山组火山岩应为早白垩世岩浆活动的产物。根据该组火山岩在空间上具有自西向东年龄渐新的演变趋势，表明中生代伊泽奈崎板块向欧亚板块碰撞俯冲应是制约区内火山活动的主要动力因素。

Abstract: Based on a case Study of the Fenlingshan volcanic apparatus, the formation ages of volcanic rocks of the Qingshan Formation in the Jiaolai Basin have been determined accurately by employing the highly precise 40Ar-39Ar dating technique． Investigation results demonstrate that the age of intermediate to alkaline potash-rich volcanic rocks of the first cycle of the Qingshan Formation is 109.9±0.6 Ma: and the age of the acidic rhyolitic volcanic rocks of the second cycle of the Qingshan Formation is 108.2±0.6Ma．It is thus evidenced that volcanic rocks of the Qingshan Formation in the Jiaolai volcanic Basin are products of Early Cretaceous magmatism. The ages of volcanic rocks of the Qingshan Formation in Shandong province display a progressively younger tendency eastwards，suggesting that the Mesozoic subduction of the Izanagi plate towards the Eurasian plate is the main dynamic factor that controlled the volcanism in this region.

邱检生，王德滋，罗清华，刘洪. 鲁东胶莱盆地青山组火山岩的^40Ar—^39Ar定年——以五莲分岭山火山机构为例[J]. J4.

QiU Jian-sheng1;2，WANG De-zi2，LO Qing-Hua3，LIU Hong2. 40Ar-39Ar Dating for Volcanic Rocks of Qingshan Formation in Jiaolai Basin，Eastern Shandong Province: A Case Study of the Fenlingshan Volcanic Apparatus in Wulian County[J]. J4.