%0 Journal Article
%T Genetic Mechanism of Trachyte in the Eastern Depression of Liaohe Rift<br>辽河裂谷东部凹陷粗面岩成因机理探讨
%A CAI Guo-gang
%A <br>蔡国刚
%J 地球学报
%D 2010
%I 
%X In various basins of the Bohai Bay, only the East Liaohe depression has well-developed trachyte. This phenomenon has long aroused much attention among geologists in China. Based on an integrated analysis of rock characteristics, tectonic movement and formation background, this paper holds that the original trachyte magma was derived from the deeper part of the upper mantle, the basalt and other igneous rocks were comagmatic rocks, but the trachyte experienced a longer time of crystallization differentiation. It is also considered that the formation of trachyte magma in the upwelling process did not experience any mixing action, with the external environment being part of the underwater eruption, that the tectonic movement constituted the internal cause for the development and distribution of magmatic activities and igneous rocks, and that the unique characteristics of the three middle sedimentation periods of the eastern sag created the internal and external environment background for the development of trachyte.
%K east depression
%K trachyte
%K crystallization differentiation
%K contamination
%K underwater environment
%K genetic mechanism
%K tectonic movement<br>东部凹陷
%K 粗面岩
%K 结晶分异
%K 混染
%K 水下环境
%K 成因机理
%K 构造运动
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=1DF69A47DE80569EC8F859DF61571180&aid=0708514DFA112793C25161716653F7CA&yid=140ECF96957D60B2&vid=4AD960B5AD2D111A&iid=0B39A22176CE99FB&sid=E2E0FBFE4D7EFB94&eid=1D01216AD76577EC&journal_id=1006-3021&journal_name=地球学报&referenced_num=0&reference_num=12