A Study on the Geological—Geochemical Dynamics of Hydrothermal Ore Deposition as Exemplified by the Muping—Rushan Gold Deposit Belt,Eastern Shandong,China     

赵伦山  高太忠等 《中国地球化学学报》1996,15(4):289-295

This paper presents a method of establishing a hydrothermal ore-forming reaction system.On the basis of the study of four typical hydrothermal deposits,the following conclusions concerning geochemical dynamic controlling during hydrothermal mineralization have been sions concerning geochemical dynaamic controlling during hydrothermal mineralization have been drawn:(1)The regional tectonic activities control the concentration and dispersion of elements in the ore-forming process in terms of their effects on the thermodynamic nature and conditions of the ore-forming reaction system.(2)During hydrothermal mineralization the activites of ore-bearing faults can be divideb into two stages:the brittle splitting stage and the brittle-tough tensing stage,which would create characteristically different geodynamic conditions for the geochemical thermodynamic ore-forming system.(3)The hydrothermal ore-forming reaaction system is an open dynamic system.At the brittle splitting stage the system was so strongly supersaturated and unequilibrated as to speed up and enhance the crystallization and differentiation of ore-forming fluids.And at the brittle-tough tensing stage,the ore-forming system was in a weak supersaturated state;with decreasing temperature and pressure the crystallization of oreforming material would show down,and it can be regarded as an equilibrated state.(4)In the lates stages of hydrothermal evolution,gold would be concentrated in the residual ore-forming solution.The pulsating fracture activite in this stage led to the crush of pyrite ore and it was then filled with gold-enriched solution,forming high-grage“fissure”gold ore.This ore-forming process could be called the coupling mechanism of ore formation.  相似文献   

新疆布尔克斯岱金矿床的构造成矿机理   总被引：7，自引：0，他引：7  

郭定良  李志纯 《大地构造与成矿学》1997,21(2):162-166

文章对布尔克斯岱金矿床构造成矿进行较详细地分析，在此基础上结合地洼理论提出了布尔克斯岱金矿床的构造成矿模式：原始矿源层→矿源层→构造破碎蚀变带成矿。  相似文献   

The hydrocarbon generation mechanism and the three-stage type model of hydrocarbon generation for carbonate source rocks   总被引：1，自引：0，他引：1  

Zhaoyun Wang  Keming Cheng 《中国科学D辑(英文版)》1997,40(3):232-238

The diagenetic mechanism and process of carbonate rocks, which is different to that of clastic rocks, decides the existence of different existing state organic matters in carbonate rocks. This has been verified by both the microscopic observation of organic petrology and the analysis of organic geochemistry of many samples. Based on the hydrous pyrolysis simulation experiment of the low-mature carbonate rocks, the contrasting study on the yield and their geochemistry characteristics of different existing state soluble organic matters of a series of various maturity samples shows that the different existing state organic matters make different contributions to hydrocarbon generation during every evolution state. So that, the hydrocarbon generation process of carbonate rocks can be summarized as the following three stages: the first is the direct degradation of biogenic bitumen macromolecules during the immature stage, the second is the thermal degradation of a large amount of kerogen at the mature stage, the last stage is the expulsion or release of inclusion organic matter owing to the increased thermal expansion pressure during the high evolution stage. Part of achievements of the Eighth Five-Year National Science-Technology Key-Task Project “85-102-02-07”.  相似文献   

裂谷盆地形成的动力学机制及其含油气性     

王骏  王东坡  刘立  邵林海 《吉林大学学报(地球科学版)》1997,(1)

以澳大利亚南部的吉普斯兰盆地和中国东北部的松辽盆地为例，通过对它们所处的地理位置、内部结构构造特征、油气藏类型、油气藏的分布特征、生储盖特征以及形成时代的比较，对纵向拼合式裂谷盆地形成的动力学机制及其含油气性作了探讨。阐明了具有相似结构构造特征和演化历史，同一时期处于相近地理环境中的沉积盆地，应具有相似的含油气远景；而这一切都是由近似的成盆动力学机制，即：地球深部动力所诱发的远源板内应力、地幔底辟等因素所控制的，再一次证明了裂谷类型的沉积盆地在油气勘探中的重要性；指明了在我国东部原裂谷系中开展油气普查勘探工作的必要性  相似文献   

由震源机制和地震波各向异性探讨青藏高原岩石圈变形   总被引：9，自引：1，他引：9  

吕庆田  许志琴 《地质论评》1997,43(4):337-346

本文据青藏高原天然地震震源参数和地震波各向异性资料，讨论了高原岩圈不同圈层的变形特性。  相似文献   

雅砻江畔雅江县城区地质灾害特征及其防治对策   总被引：1，自引：0，他引：1  

郑万模  唐小平 《地质灾害与环境保护》1997,8(3):13-20

四川省雅江县城座落于雅砻江河畔。在城区０．８４ｋｍ＾２范围内发育有城南滑坡，城区斜 地面变形、城东危岩和城北滑坡四大地质灾害单元，构成了较为罕见的雅江县城独特的地质灾害特征。论述了雅江县城稆种地质这为害的特征及危害性，并对各咱地质灾害单元按其轻重缓解提出相的防治措施和对策。  相似文献   

Source mechanism of small-moderate earth- quakes and tectonic stress field in Yunnan Province     

吴建平  明跃红  王椿镛 《地震学报(英文版)》2004,17(5):509-517

IntroductionYunnanProvinceislocatedinthesouthofNorth-SouthseismiczoneinChina.ItisoneofthehighseismicactiveregionsinChinesemainland.Morethanonehundredstrongearthquakeswithmagnitude6ormoreoccurredinthisregioninhistory.AsanimportantsoutheasternmarginofTibetanPlateau,YunnanregionisahotspotinstudyonthedynamicsofTibetanPlateau.Theactionsofcompressivestressinnorth-southorientationandgravitationalpotentialcausedlateralextrusionofmaterialintheplateauwiththeupliftingofTibetanPlateau.Severalblocksa…  相似文献   

2003年6、7月西昌二次4.8级地震的预测与分析     

牟雅元 《四川地震》2004,(4):33-37

2003年6月17日和7月10日,先后在四川省西昌市和西昌-昭觉间发生2次ML4 8级强有感地震.对于这2次地震,我们曾作了较好的中期和短期预测.但是对于6月17日发生的第一次ML4 8级地震,未能做出临震预测;对于第二次地震,则在7月1日向上级填报的周会商表中作了明确的临震预测,7月10日,在西昌-昭觉间发生了ML4.8级地震.根据西昌地震遥测台网各子台的P波初动求解震源机制,结合地震所处的地质构造以及现场烈度考察圈定出的结果分析,认为这二次地震是由安宁河断裂带、则木河断裂、凉山断裂所围成的凉山小菱形块体活动的结果.  相似文献   

基于“双差法”地震精确定位研究2002年12月14日玉门5.9级地震的发震断层和发震机制   总被引：4，自引：5，他引：4       下载免费PDF全文

荣代潞  李亚荣 《地震工程学报》2004,26(3):223-227

利用双差地震定位方法对2002年12月14日玉门5．9级地震主震和余震序列进行了精确定位，在此基础上讨论了本次地震的发震断层和发震机制。  相似文献   

巴基斯坦北Potwar形变区地震的震源机制研究   总被引：2，自引：0，他引：2       下载免费PDF全文

MonaLisa  ShahidA．Khan  AzamA．Khwaja  许忠淮 《地震学报》2004,26(3):231-237

巴基斯坦北Potwar形变区是西北喜马拉雅褶皱逆冲带前陆区的一部分，绘制了该区的地震活动性图. 与相邻地区比较，该区地震并不活跃，没有显示出与地表地质构造相关的清晰地震活动图象. 做出了4次地震的震源机制解. 结果表明，有3次地震是左旋走滑断层活动，另一次地震是逆断层活动. 地震震源机制解的P轴方向为NW-SE和NE-SW. 现今的构造形变很可能也包括基底的形变.   相似文献