EPMA Monazite U-Th-Pb Chemical Dating for Monzogranites from Guangtoushan Intrusion in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PlaceName w:st="on">Western</st1:PlaceName> <st1:PlaceName w:st="on">Qinling</st1:PlaceName> <st1:PlaceType w:st="on">Mountains</st1:PlaceType>, <st1:place w:st="on">Central China</st1:place> and Its Geological Significance <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

EPMA Monazite U-Th-Pb Chemical Dating for Monzogranites from Guangtoushan Intrusion in Western Qinling Mountains, Central China and Its Geological Significance

详细信息

责任者：Chen Xu (Key Laboratory of Orogenic Belt and Crustal Evolution ; Ministry of Education ; Peking University ; Beijing 100871 ; China) ; Liu Shuwen
刊名：Geological Bulletin of China
出版年：2009
卷期：28(7)
关键词：二长花岗岩 ; monzogranite ; 铀—钍—铅计时 ; U-Th-Pb dating ; 秦岭 ; Qinling Mountains
页码：p.888-895
图表：3 illus., 2 tables, 27 refs.
分类号：0801
issnNo：ISSN1671-2552
isbnNo：CN11-4648/P

摘要

The Guangtoushan granitoid pluton consists of early quartz diorites, tonalities and late intrusive monzogranites. Early lithological assemblages were deformed during the collision event between the South China Craton (SCC) and the Qinling-Dabie Microblock (QDM); and some rocks of them have been partly changed into mylonites, which indicate that they were formed before the closure of Mianxian-Lueyang paleo-ocean basin. However, later stage S-type monzogranites emplaced into early quartz diorites and tonalities and the ductile shear zones as one main mark of the closure of Mianxian-Lueyang paleo-ocean basin, which reveals that the S-type monzogranites are correlated to the closure of the Mianxian-Lueyang suture zone. Therefore, the geochronological data of Guangtoushan granitic pluton can be used to constrain the timing of collision between the SCC and the QDM.

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