利用应力场预测热液区域——以TAG区为例  

Analyzing the gravitational stress field to forecast hydrothermal field——A case study of TAG hydrothemal field

作　　者：陈钦柱 陶春辉[2] 廖时理[2] 李怀明[2] 邓显明[2] 

机构地区：[1]温州科技职业学院园林与水利工程学院,浙江温州325000 [2]国家海洋局第二海洋研究所海底科学重点实验室,浙江杭州310012

出　　处：《海洋学报》2017年第1期46-51,共6页

基　　金：国家重点基础研究发展计划(2012CB417305);国际海域资源调查与开发"十二五"重大项目(DY125-11-R-01;DY125-11-R-05);国际海底管理局(ISA)捐赠基金

摘　　要：本文根据TAG区的钻探资料及岩心测试结果,建立了双层地质模型,在此基础上利用ANSYS应力软件并结合TAG热液区的地形数据对该区进行应力模拟。结果表明:热液喷口区域与最大水平应力低值区有较好的对应关系。其中仍处于活动状态的TAG丘状体区呈现明显的局部最大水平应力低值;而已经停止活动并且不具有典型喷口地形的MIR丘状体区域则处于最大水平应力的非封闭低值区域。据此,本文在TAG丘状体区域圈定了5个喷口可能区域,钻探结果揭示区内存在较好的矿化和蚀变现象,表明应力场预测法可能是一种有效的成矿预测方法。According to drilling data,two layer＇s model is established by corresponding physical properties.Based on topographic data,here we use ANSYS software to simulate the gravitational stress field of TAG hydrothermal field.The result shows that,the hydrothermal vent locations are corresponding to the low stress area of the maximum horizontal stress.The stress of the active TAG doom area are characterized by local stress low surrounding by relative stress high,and the inactive MIR doom area without typical hydrothermal vent topography features located on unclosed area of the maximum horizontal stress low.Based on these conclusions,we predicted five places where the hydrothermal liquid probably flew out.According to drilling result,significant anhydrite was recovered in these areas,indicating that gravitational stress could be used for hydrothermal activity prediction.

关 键 词：海底地形 TAG热液区 应力场 成矿预测 

分 类 号：P738.6[天文地球—海洋地质]