Geochronological Study on the
详细信息
- 责任者：Li Xuping (College of Geological Science & Engineering ; Shandong University of Science and Technology ; Qingdao 266510 ; China) ; Kong Fanmei
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(7)
- 关键词：杂岩 ; complexes ; 铀—铅计时 ; U-Pb dating ; 黑龙江省 ; Heilongjiang Province
- 页码：p.2015-2024
- 图表：5 illus., 1 table, 50 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
///The Heilongjian complex distributes mainly to the east of Mudanjiang fault,tending towards north-south along the western margin of Jiamusi massif.LA-ICP-MS zircon U-Pb dating of epidote amphibolite and migmatitic granite of Heilongjian complex from the Jinmantun Taipinggou and Toudaogou in Luobei area is carried out in order to determine the age and to discuss the geotectonic background and metamorphic events that the complex has experienced.Results show that there are two well defined group ages,i.e.weighted average 206Pb/238U ages are 256.0±1.0 Ma（n=15,MSWD=0.89）and 227.1±1.4 Ma（n=11,MSWD=1.3）.The mica-bearing epidote amphibolite and migmatitic granite exhibited possibly two different stages of metamorphic processes during the subduction of Jiamusi massif and its western oceanic crust margin.The age of 256.1±1.4 Ma from mica bearing epidote amphibolite is metamorphic age,representing a early thermal event of subduction;while migmatitic granite with 227.1±1.4 Ma is late thermal event toward to the end of subduction and collision.By comparison these ages with that of collisional volcanic arc on Jiamusi massif,the authors suggest that the subduction and afterwards collision between the Jiamusi massif and its western Songnen block is about 220~317 Ma.The Heilongjian complex mainly formed from Late Hercynian to Indo-Chinese epoch,while its blue-schist facies metamorphism that may occur before 256 Ma.
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