布达特群热流体活动及其对火山碎屑岩的改造作用——以海拉尔盆地贝尔凹陷为例  

The Thermal Fluid Activities and Their Modification on Volcaniclastic Rock in Budate Group—An Example from the Beier Sag of Hailaer Basin

作　　者：李春柏[1] 张新涛[2] 刘立[3] 任延广[4] 孟鹏[3] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]中国石油大学资源与信息学院,北京102249 [3]吉林大学地球科学学院,长春130061 [4]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《吉林大学学报（地球科学版）》2006年第2期221-226,共6页Journal of Jilin University：Earth Science Edition

基　　金：中石油勘探项目(040101-1)

摘　　要：海拉尔盆地贝尔凹陷布达特群热流体活动频繁,主要特征如下:多种类型、多期次脉体的发育;受局部热流体作用,不同地区镜质体反射率随深度的变化明显;热流体在形成过程中具有较高的温度场。同时,受热流体活动的影响,热流体对火山碎屑岩具有一定改造作用,如在安山质岩屑凝灰岩中,斜长石绢云母化、火山岩岩屑绿泥石化明显;在凝灰质泥岩中,热流体对围岩中有机碳具有明显的"催熟"加热作用,微量元素则出现异常现象。这些变化从微观角度进一步证实了热流体活动存在的证据。The thermal fluid acted frequently in the Budate Group of the Beier sag, Hailaer Basin. The main characters of the thermal fluid activity are recognized as follow： many types and stages of veins are widely developed; vitrinite reflectivity of different areas varies apparently with the depth; there was a high temperature field during the formation of the thermal fluid, meanwhile, the volcaniclastic rocks were modificated by the thermal fluid activity, for example, sericitization of plagioclase, chloritization of volcanic detritus in andesitic detris tuff; in the tufaceous mud, the thermal fluid activity accelerates ＂maturating＂ of the organic carbon by heating; and the trace elements show an anomaly in the wall rocks. These changes prove further the existence of the thermal fluid activity in micro-scale.

关 键 词：海拉尔盆地 布达特群 热流体活动 火山碎屑岩 

分 类 号：P618.13[天文地球—矿床学]