构造附加静水压力及构造物理化学在地质研究中的应用  

APPLICATION OF TECTONO ORIGINAL ADDITIONAL HYDROSTATIC PRESSURE AND TECTONIC PHYSICOCHEMISTRY IN GEOLOGICAL RESEARCHING

作　　者：吕古贤[1] 王义强[2] 郭涛[1] 孙丰月[2] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]长春科技大学,吉林长春130061

出　　处：《辽宁地质》1999年第3期170-176,共7页

基　　金：国家计委科技找矿项目;国家科委基础研究特别支持项目;国家攀登项目

摘　　要：“构造附加静水压力”概念认为，地壳任一点静水压力部分是由重力所附加的静水压力和由构造作用力所附加的静水压力叠合而成的。构造叠加致使同一地壳深度的水平面上静水压力值不相等，这种压力梯度是流体及油气长距离水平运移的主要原因。建立岩石矿床形成深度的构造校正测算方法，得出胶东“玲珑－ 焦家式”金矿成矿深度仅３ ｋｍ 左右的数据，进而测得大别超高压变质带含柯石英榴辉岩形成深度仅≥３２ ｋｍ ，它们可能是壳内构造物理化学过程的产物； 逐步形成构造通过影响物理化学环境的方式影响成岩成矿地球化学过程， 即构造物理化学成矿的新认识， 探讨应用构造物理化学场结构分析与界面成矿的观点进行预测未知区隐伏矿床。The knowledge that hydrostatic pressure is equal to the gravity value of the overlying rocks in studying a dynamic state of certain underground site is argued in this paper. Application of tectono original additional hydrostatic pressure and tectonic physicochemistry in geological researching are discussed and the influence of tectonic stress on hydrostatic pressure state and its significance are also studied . The authors suggest that the stress field Tin the crust is a combination or superpo sition of total hydrostatic pressure P with differential stress σ, and the total hydrostatic pressure P at any point in the crust comprises two parts: one is spherical stress tensor PR caused by the gravity ,and the other is spherical stress tensor PS caused by tectonic stress,therefore Pcouldn' t be attributed to the gravity of overlying rocks only . The results obtained by a finite element simu lation indicate that the tectono original additional hydrostatic pressures Ps decrease gradually from the compressive zone ( P ) to the shear zone (P )and to the tensile zone ( P ) ,i. e. P > P > P at the same depth . On the above mentioned research , it is further put forward that the gradient of unequal hy drostatic pressure mainly caused by tectonic stress in the same crust depth is the major factor driving fluid and oil and gas to move for a long distance in horizontal direction ; the method of measurement and calculation of metallogenetic depth corrected by PS is established , by which the only about 3 km of depth of metallogenesis of Linglong - Jiaojia type gold deposits, Jiaodong , is calculated. This research result has been proved by engineering prospecting in the area,the forma tion depth of ≥32 km of the coesite bearing eclogite in Yingshan County in Dabie Ultra high Pres sure Metamorphic(UHPM) zone is obtained , such as the UHPM zone probably is the tectonic physicochemical products of the inner crust;the knowledge and result about the analysis of texture of tectono physicochemi

关 键 词：构造附加 静水压力 油气运移 构造物理化学 

分 类 号：P618.130.1[天文地球—矿床学] P313[天文地球—地质学]