摘要
秦岭东段陕西旬阳三里峡生物礁是一个发育较好的近南北向展布的石炭纪堤礁．该生物礁的造礁功能比较复杂，在礁的不同生长阶段有不同的造礁作用方式．礁体内生物相对单调，主要为有孔虫、藻类、腕足类及介形类等，它们组成Ｄａｓｙｃｌａｄａｃｅａｅ－Ｃｙｎｏｐｈｙｔａ群落及Ｆｏｒａｍｉｎｉｆｅｒａ－Ｃｙａｎｏｐｈｙｔａ群落．在礁的形成过程中有４个方向的演化序列，它们构成礁形成过程的三个阶段（生物定殖。
San Li xia reef,which is located in the east part of Qinling mountain (Xunyang County,Shaanxi Province,China) and ranges approximately N S Orientation,is a well developed Carboniferous barrier reef.An analysis of all communities shows that the organic functions are very complex,there are different reefbuilding actions at every reef building stage.Organisms are relativly monotonous in the reef,they consist mainly of Foraminifera 、Algae、 Brachiopda and Ostracoda etc.,and formed 2 communities ( Dasycladaceae Cyanophyta community and Foraminifera Cyanophyta community).By studying San Li xia reef,we find that it has four direction evolution sequence during the formation process of the reef.All of these evolution sequence make up the main contents of the three stages ( stabilization stage、baffle reef stage and bind cover reef stage) during the formation process of the reef.
关键词
陕西
海槽
晚石炭世
生物礁
群落
shaanxi
qinling geosynclinal
late carboniferous
reef
community
evolution sequence
