%0 Journal Article
%T Petrography characteristics of the orbicular dioritic rocks in Luanping, Hebei province and the discussion of the genesis of orbicular structure<br>滦平球状闪长岩岩相学特征和球状构造成因探讨
%A MA Fang~
%A <br>马芳
%A 穆治国
%A 刘玉琳
%J 岩石学报
%D 2004
%I 
%X The Luanping dioritie pluton is special with an orbicular structure. According to the differences of the cores, the orbs in the pluton can be devided to three types: the orbs with comagmatic composition core, the orbs with enclaves core and the orbs without clear shells. On one side, the shells display mineral constitute rhythm which bleached layers almost without any hornblende and dark layers with some hornblende developed alternately. On the other side, the shells display mineral texture rhythm which porphyritic subhedral-anhedral plagioclase combing layers alternately developed with fine grained subhedral-eudral plagioclase layers. The porphyritic plagioclase in the orbs have clear grid twin, while the plagioclase in the host rocks and the matrix have multiple twin. The orbicular structure described in the article was formed by assimilation of enclaves and magma crystallization around the enclaves, the mineral constitute rhythm and the mineral texture rhythm of the shells probably controlled by the variation of water content in the magma.
%K Orbicular diorite
%K Rhythm
%K Assimilation
%K Magma crystallization
%K Luanping<br>球状闪长岩
%K 韵律
%K 同化作用
%K 结晶作用
%K 滦平
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=BA9D71401889F506&yid=D0E58B75BFD8E51C&vid=A04140E723CB732E&iid=B31275AF3241DB2D&sid=AFD02B86BFB3C7FC&eid=71F658B36F902583&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=40