火山作用—深成作用的相互联系     

高秉璋 《江西地质》1997,11(4):33-40

火山作用－深成作用的相互联系是研究岩浆活动从侵入到喷出，以及演化和发展的重要内容。高位深成岩体是其过渡类型，其中中心式环状杂岩体尤为重要，关键是要识别含棱角状捕掳体及破碎捕掳晶的侵入凝灰岩，包括侵入角砾岩，爆发角砾岩等一系列具侵入特征的火成碎屑岩类；大量的上覆火山岩碎块作为捕掳体出现在充气岩浆中，模糊了深成岩类和火山岩类，但根据产出形态及接触关系等特征仍可加以区别，本文对此问题作了明确的阐明，并以玉华山杂岩体为实例加以简要的论述  相似文献   

湖北郧西六斗金矿床地质地球化学及矿床成因研究     

田云华 《华北地质》1997,(3)

郧西县六斗石英脉一破碎蚀变岩型金矿床，是鄂西北地区近年新发现的金矿床之一。通过对金矿床产出地质背景、控矿地质条件、围岩蚀变、矿石矿物、包体物理化学、同位素地球化学等的研究，阐述了六斗金矿床的形成机理和成矿物质来源。确定了该矿床成因类型为与韧性剪切变形变质作用有关的中一低温热液矿床。  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   

Main models and distribution patterns of gas reservoirs in large-medium gas fields of China     

Yan Song  Jinxing Dai  Chunsen Dai  Ying Chen  Feng Hong 《中国科学D辑(英文版)》1997,40(1):23-31

Based on characteristics and trap types of gas reservoirs in large and medium gas fields in China, 4 gas reservoir models have been established:(i) structural trap gas reservoir model I, formed earlier than or simutaneously with generating of gases; (ii) structural trap gas reservoir model II, formed later than generating of gases; (iii) fossil weathered residuum gas reservoir model; and (iV) mud diapir abnormal temperature and pressure gas reservoir model. Distribution patterns of large-medium gas fields are described with the concept of “sealed compartment”. It is concluded that the inner-compartment area, marginal area of the compartment and the areas between two overlapped sealed compartments are the most favourable areas for discovering large-medium gas fields. Project supported by the “85–102” Chinese National Key Science and Technology Project.  相似文献   

苏州地区I-A型花岗岩特征与成因的对比研究   总被引：5，自引：0，他引：5       下载免费PDF全文

周若  杨静  任进 《地球科学》1997,6(3)

应用岩石学、矿物学、地球化学及岩浆物理学等的理论和方法，对苏州地区Ｉ型和Ａ型花岗岩的特征及成因进行了对比研究，得出以下主要结论：Ｉ型花岗岩为晚侏罗世火山弧压性环境产物，侵位较深；而Ａ型者为Ａ２型花岗岩，为早白垩世造山后张性环境产物，侵位较浅，具晶洞构造．Ａ型比Ｉ型花岗岩以酸度、碱度、Ａｌ，Ｆ含量高而Ｈ２Ｏ＋含量低，以ＲＥＥ及不相容元素丰度高，负Ｅｕ异常强，而ｗ（ＬＲＥＥ）／ｗ（ＨＲＥＥ）低为特色．Ａ型者矿物结晶顺序先浅色后暗色，暗色矿物以富铁贫镁、ＲＥＥ分配系数高及负Ｅｕ异常明显及长石富碱贫钙，而与Ｉ型花岗岩不同．Ａ型者副矿物４０余种，属锆石－褐帘石－萤石型，锆石结晶温度高，（１１０），（１１１）晶面发育；而Ｉ型者仅１０余种，属榍石－锆石－磷灰石型，锆石结晶温度低，（１００），（３１１）晶面发育．Ｉ型花岗岩为幔源岩浆与下地壳部分熔融岩浆混合及ＡＦＣ作用产物，而Ａ型花岗岩为残余下地壳（麻粒岩相）熔融后分离结晶产物，二者并非同源岩浆演化关系．Ａ型比Ｉ型岩浆来源浅，酸度大，含水少；故岩浆密度小，粘度大，上升慢，冷凝长．受密度筛影响，Ａ型花岗岩岩浆房及侵位深度小于Ｉ型  相似文献   

塔里木盆地西南缘的岩石组合及其构造演化     

刘生国  郭建华 《海相油气地质》1997,2(4):15-19

塔里木盆地西南缘可划分为喀喇昆仑、西昆仑、塔里木等三个地层区和康西瓦、库地等两个缝合带。自震旦纪以来,该区经历了震旦纪—泥盆纪和石炭纪—第四纪两大构造旋回。对应每一旋回,喀喇昆仑地层区和塔里木地层区发育有被动大陆边缘盆地和碰撞造山两种类型的岩石组合。西昆仑地层区发育了被动大陆边缘盆地、俯冲消减带和碰撞造山等三种类型的岩石组合。康西瓦缝合带是康西瓦洋经历了震旦纪—中泥盆世和早石炭世—晚侏罗世两次开合后的遗迹,它既是喀喇昆仑和西昆仑两个地层区的分界线,又是羌塘和塔里木两个板块的分界线;库地缝合带则是库地洋经历早石炭世—早二叠世一次开合的遗迹,分割了西昆仑和塔里木这两个地层区。  相似文献   

矿产开发与环境保护   总被引：4，自引：0，他引：4  

郭真 《吉林地质》1997,16(2):11-16

通过国内多个矿区实例，较系统地叙述了矿产资源开发导致的生态环境破坏和污染状况。表明矿产开发中对环境污染的途径包括河流、土壤、等。最后简要介绍了国内、国外几种对采矿污染比较有效的防治措施。  相似文献   

The Bulong Gold Deposit-a Quartz-Barite Vein Type Gold Deposit in Xinjiang:Geological Characteristics and S, He and Ar Isotopic Compositions   总被引：2，自引：0，他引：2  

YANG Fuquan  WANG Yitian  MAO Jingwen Institute of Mineral Resources  Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》2004,78(2):404-416

The Bulong gold deposit, located in the southwest Tianshan in China, occurs in the Upper Devonian finegrained clastic rocks. The gold orebodies are controlled by an gently inclined interlayer fractured zone. They are hosted only in quartz-barite veins though there are barite veins and quartz veins in the ore district. The δ34S values of pyrite in the ores range from 14.6‰ to 19.2‰ and those of barite from 35.0‰ to 39.6‰, indicating that the sulfur was derived from the strata. 3He/4He ratios of fluid inclusions in pyrite are 0.24-0.82 R/Ra, approximating to that of the crust. The 40Ar/39Ar ratios range from 338 to 471, slightly higher than that of the atmosphere. 40Ar /4He ratios of ore fluids range from 0.015 to 0.412 with a mean of 0.153. Helium and argon isotope compositions of fluid inclusions show that the ore fluids of the Bulong gold deposit were mainly derived from the crust.  相似文献   

多年冻土区路桥过渡段的一种新结构     

刘建坤  鲍维猛  黎明  葛建军 《冰川冻土》2004,26(Z1):210-214

The design of roadbed-abutment transition part is always a challenging problem in transportation engineering, especially in permafrost distribution zone. A new type of roadbed-abutment transition part on permafrost was presented, and long-term observation was conducted for the deformation and the thermal regime of a roadbed-abutment transition part in the constructing Qinghai-Tibet Railway. In this paper, a new structure was presented and the observed settlements both in the subgrade and the base and its dependency with the thermal regime (permafrost table) were analyzed. In conclusion the roadbed-a-butment transition method for permafrost distribution zone was evaluated.  相似文献   

Blown‐sand transport rate     

Jinren Ni  Zhenshan Li  Cesar Mendoza 《地球表面变化过程与地形》2004,29(1):1-14

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