青海省乌兰县托莫尔日特金矿区构造应力场与流体运移势的计算机数值模拟  

NUMERICAL MODELING OF TECTONIC STRESS FIELD AND FLUID SEEPAGE POTENTIAL IN TOMORITE ORE REGION, WULAN COUNTY, QINGHAI PROVINCE

作　　者：张拴宏[1] 周显强[1] 田晓娟[1] 宋友贵[1] 杨美伶[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081

出　　处：《地质与勘探》2002年第1期40-45,共6页Geology and Exploration

基　　金：原地质矿产部定向科研项目 (地科定 97- 2 2 )部分成果

摘　　要：运用有限元数值模型 ,对托莫尔日特地区成矿初期及主成矿期构造应力场及流体运移势进行了二维计算机模拟。模拟结果显示NW—NWW向断裂构造带对本区构造应力场的控制是十分明显的。在该断裂带穿过的乌达热乎、赛坝沟成矿带及其北部、石棉沟西部地区 ,是强烈的应力梯度带、高剪应力带、高应变能密度带及低流体运移势分布区 ,反映了这些地区构造环境优越 ,且是流体运移的有利渗流区。由于赛坝沟、乌达热乎是本区最好的成矿区域 ,而乌达热乎北部地区、赛坝沟北部地区、石棉沟西部地区与此区有相同或相似应力场及流体运移势特征 ,预测这些地区找矿前景较好 ,但考虑到成矿热液来源等其它控矿因素 ,这些地区的成矿规模可能比赛坝沟、乌达热乎成矿区小 ,品位也不如此区高。这与这些地区有矿化显示 ,但还没有发现具规模矿床的地质事实是完全吻合的。Numerical modeling of tectonic stress field and fluid seepage potential in Tomorite ore region has been studied in the paper. The modeling results show that NW～NWW trend ductile-brittle shear zones have much effects on the tectonic stress field and fluid seepage potential in the area. The results also show that Saibagou, Wudarehu, northern Wudarehu, northern Saibagou and western Shimiangou are regions with high stress gradient, high shear stress, high strain density and low fluid seepage potential. So they are structural favorable regions for mineralization, and also favorable regions for fluid transportation. Saibagou and Wudarehu ore zones are the best metallogenic regions in the area at present. Northern Wudarehu, northern Saibagou and western Shimiangou have similar features of tectonic stress field and fluid seepage potential to those regions. According to the 'prospect unknown area from the known area' principle, the above regions would be prospective metallogenic zones in the area and should be paid much more attention in the future. But if the sources of ore-forming materials and ore-forming fluids are considered, we would know that the metallogenic scale in those prospective regions would be smaller and ore tenor would be lower. Until now, no industrial ore bodies had were found in these regions, but some low tenor mineralization and mineralized points had been found, which corresponds to the modeling results in the area.

关 键 词：构造应力场 流体运移势 数值模拟 成矿预测 金矿床 青海 乌兰县 控矿构造 

分 类 号：P618.51[天文地球—矿床学]