共查询到20条相似文献，搜索用时 15 毫秒
1.
华北地块北缘是我国金矿的主要产地之一。其金的成矿地质背景复杂,主要可分为变质基底区、地槽区、盖层区、中生代火山断陷盆地、构造－岩浆活动带５种类型。该区大部分金矿床与中生代构造岩浆活动有关。以成矿作用为主要依据将华北地块北缘金矿床划分为三大类：一类是侵入岩浆热液型金矿床;一类是火山－热液型金矿床;第三类是沉积－改造型金矿床。结合成矿地质背景分析和矿床类型的划分,将华北地块北缘金矿床划分为三个系列组合,即侵入岩浆热液金成矿系列组合、火山－次火山热液金成矿系列组合及沉积－改造金成矿系列组合。 相似文献
2.
腾冲不但是现代火山活动区,也是地热异常区,这里温泉、热泉及喷气孔到处可见。本文叙述了热水中气体及其它重要化学成分的组成和分布特征。按其气体成分特点,进行了简要的分带、分区,并且讨论了地热流体及其与地质构造、火山和地震活动的关系。 相似文献
3.
4.
铜冶店孙祖断裂展布方向与区域上基底岩石的条带展布方向一致,该断裂规模巨大,总体上分为6段,作为构造单元边界的分划性断裂往往深切上地幔或下地壳,从而成为深部岩浆和矿液的上升通道。它控制着该区成矿带或成矿区的分布,金牛山岩体、矿山岩体、铁铜沟岩体、铜井岩体等中基性—中性—中偏碱性(中偏酸性)杂岩体亦是受铜冶店孙祖及其次级断裂或与其他构造复合部位控制。该断裂经历了多期活动,早期活动控制着两侧地质体的分布,晚期活动对各种含矿热液的运移和富集起着不同程度的控制作用,是铁、铜、金矿成矿作用的有机组成部分,“构造、地层、岩体”三要素是形成接触交代(矽卡岩)型铁矿等矿床必不可少的控矿因素。该断裂活动提供了成矿物质和流体迁移、聚集的热力和动力,提供了成矿物质运移和沉淀的空间场所,其所控制的矽卡岩型铁矿床及中低温热液金、铜等矿床,多集中于铜冶店孙祖断裂鹿野前孤山段,该断裂具“构造控矿,分段富集(走向、倾向)”的特点。 相似文献
5.
Shan Xuanlong 《世界地质(英文版)》2000,3(2)
Based on study on the relation with volcanic rock and oil & gas in Songliao Basin and Liaohe Basin in northeast China, author proposes that material from deep by volcanism enrichs the resources in basins, that heat by volcanism promotes organic matter transforming to oil and gas, that volcanic reservoir is fracture, vesicular, solution pore, intercrystal pore.Lava facies and pyroclastic facies are favourable reservoir. Mesozoic volcanic reservoir is majority of intermediate, acid rock,but Cenozoic volcanic reservoir is majority of basalt. Types of oil and gas pool relating to volcanic rock include volcanic fracture pool, volcanic unconformity pool, volcanic rock - screened pool, volcanic darpe structural pool. 相似文献
6.
7.
8.
Yang Gangbin 《地球科学与环境学报》1997,(3)
延边地区北部大面积出露中生界（Ｊ３）火山岩系，为正常的钙碱性系列，由玄武岩－安山岩－石英安山岩组成，以富含ＡＳ、Ａｇ、Ｓｂ、ＡＳ、Ｂｉ为特征。其中的金矿床可分为两类即蚀变岩型高温热液矿床和浅成中低温热液矿床。同位素资料表明，其成矿热液主要来自火山岩浆。 相似文献
9.
朝阳沟破火山口出露面积约８０ｋｍ２，呈椭圆状，受北东与北西两组基底断裂控制，火山活动期为晚侏罗－早白垩世。火山活动以爆发为主，具多期次脉动喷发特点。岩浆演化由早期至晚期呈由中性到酸性，火山喷发序次由外向内由老至新，岩石结构由细至粗，晚期潜火山岩相正长斑岩沿放射状断裂侵入。 相似文献
10.
BOLi-qun ZHAOYun-ping HUARen-kui 《中国地理科学(英文版)》2003,13(4):347-351
Volcanic eruption is one of the most serious geological disasters, however, a host of facts have proven that the Changbai Mountains volcano is a modem dormant one and has ever erupted disastrously. With the rapid development of remote sensing technology, space monitoring of volcanic activities has already become possible, particularly in the application of thermal infrared remote sensing. The paper, through the detailed analysis of geothermal anomaly factors such as heat radiation, heat conduction and convection, depicts the monitoring principles by which volcano activities would be monitored efficiently and effectively. Reasons for abrupt geothermal anomaly are mainly analyzed, and transmission mechanism of geothermal anomaly in the volcanic regions is explained. Also, a variety of noises disturbing the transmission of normal geothermal anomaly are presented. Finally, some clues are given based on discussing thermal infrared remote sensing monitoring mechanism toward the volcanic areas. 相似文献
11.
桑托斯盆地盐下碳酸盐储层中火成岩分布广泛,以盆地C区块为解剖区,通过对区内火成岩岩石学、年代学以及CO2气体同位素测试分析等,明确了区内火成岩发育特征,剖析了其对油气成藏的影响。C区块至少经历了阿普特期和圣通-坎潘期2期岩浆活动,其中阿普特期岩浆以喷发岩为主,经历了多次喷发,并伴有多次侵入;圣通-坎潘期岩浆规模较小,侵入比较随机。阿普特期岩浆多次喷发改造古地形,形成局部凸起,促成并控制了Itapema组介壳灰岩的沉积发育,形成了巨厚的火山岩-介壳灰岩复合体,不仅造成了局部构造反转和圈闭高点迁移,而且也促成了Barra Velha组优质微生物灰岩的发育。区块北翼属早期古隆,Barra Velha组也发育一定规模微生物灰岩滩体。圣通-坎潘期及之后岩浆活动伴生的CO2大规模侵入,对烃类流体进行萃取和抽提改造,形成含凝析油的CO2气藏。 相似文献
12.
西湖凹陷中央反转带中北部大型气田成藏因素及动态匹配关系至今不明。通过针对烃源岩、储层、输导体系及成藏期等成藏关键因素进行系统分析,建立"源-储-圈-输"的动态成藏过程分析中央反转带中北部大气田的成藏主控因素。研究表明始新统宝石组与平湖组煤系烃源岩不仅生气强度大,而且中新世晚期以来的快速生、排气为中央反转带中北部的大中型天然气藏提供了充足油气源;花港组小于4 000 m地层的酸性地层水是形成有利储层的关键;中新世晚期发生的龙井运动强烈挤压作用使中央反转带发生了构造变形和断层开启活动,为圈闭和油气输导通道的形成创造了条件。综合"源-储-圈-输"分析认为成藏主控因素在生烃期的有机耦合造就了始新统煤系烃源岩高效生气及天然气的有效运移聚集成藏的全过程。本次研究为研究区大气田的勘探提供了借鉴。 相似文献
13.
The Changling gas field is occurs in tight sandstone reservoirs of the Lower Cretaceous Denglouku Formation in the Changling fault depression , southern Songliao Basin , China, which constitutes a new gas-pro-ducing area in the depression .Using information on the source-reservoir-cap rock assemblage of the Denglouku Formation, fault activity, and single well burial history of well CS 1, together with data on reservoir fluid inclu-sion and laser Raman spectroscopy , we described the formation of the Changling gas field and determine that this fault depression did not possess suitable conditions for hydrocarbon generation .Coal-derived methane gen-erated from underlying hydrocarbon source rock accumulated in the Lower Cretaceous Yingcheng Formation .At the end of the Late Cretaceous Qingshankou Stage , underwater volcanic eruptions occurred in the northern part of the Changling gas field near Qian'an, resulting in the reactivation of deep faults .Mantle-sourced inorganic CO2 migrated along faults to hydrocarbon gas reservoirs in volcanic rocks of the Yingcheng Formation ;Mean-while, displaced methane ( hydrocarbon gas ) migrated upward to sand reservoirs of the Denglouku Formation . The methane accumulated and formed secondary gas reservoirs ,Therefore fault activity was the main factor con-trolling the generation of gas reservoirs in the Denglouku Formation .The main accumulation period of the Yingcheng hydrocarbon gas reservoirs was 82 Ma.Whereas gas reservoir formation in the overlying Denglongku Formation was 79 Ma, slightly later than the time of formation of the Yingcheng gas reservoir in CS 1 well area. At 79 Ma, the burial depth of the Denglouku Formation was 1800-2000 m, the diagenesis is relatively weak and the physical properties of the reservoir are relatively favorable for accumulation .This period is not only at gas generation peak time of three sets of source rock but also at the reactivation of deep faults during the forma -tion of fault-bound depressions , thereby providing favorable conditions for the migration and accumulation of methane . 相似文献
14.
采用D-InSAR技术对覆盖2020年日本鹿儿岛市樱岛火山喷发前后时段的2景降轨Sentinel-1A数据进行处理,获取日本鹿儿岛市樱岛火山南岳火山口喷发事件引起的地表形变场,并在此基础上结合点源Mogi模型对樱岛火山喷发时的岩浆源进行反演分析。结果表明,2020-07-28~08-09期间沉降主要集中在火山中心地区,最大沉降区域为火山中心地带,最大沉降量与平均沉降量分别为5.5 cm与2.85 cm;抬升主要发生在火山边缘区域,最大抬升量与平均抬升量分别为5 cm与2.24 cm,抬升可能与艾拉火山口下方的岩浆活动有关。根据点源Mogi模型反演得到岩浆源深度和体积变化量分别为1.016 km和-0.139×106 m3,岩浆源位于南岳下方,与南岳火山口的喷发活动有关。 相似文献
15.
???????????????2002??2005?????????????????GPS???????? ?????????????????????????? ????????2002??2003??????????????α?仯??????????GPS??λ??????? ????????(??P00?350 km)??????????????????????????????????????????????????α?仯???????????????2003??????????α?仯????????С,?????2004??2005???????GPS??λ??????????λ????????????С??????????????????????? 相似文献
16.
王家庄、碑楼铜矿床位于邹平火山岩盆地内,区内为山东重要的铜矿产地。在收集以往地质工作资料的基础上,详细分析了王家庄铜矿床与碑楼铜矿床的地质特征,总结了赋矿岩石、围岩、矿体规模、形态、产状等特征,分析了矿石中金属矿物与矿石类型;对王家庄与碑楼铜矿的成矿期次与成矿条件进行了探讨,研究发现,邹平火山岩主要经历了3次喷发与侵入活动,按空间分布位置分成外成矿带、中成矿带和内成矿带3个成矿带,王家庄与碑楼铜矿位于内成矿带,研究认为其形成于岩浆活动晚期。通过对比国内不同斑岩型铜矿含矿岩体岩石化学特征,发现王家庄岩体及碑楼岩体等都是形成斑岩铜矿的有利地段。通过对王家庄铜矿与碑楼铜矿的矿化蚀变标志研究,发现其蚀变以钾化、钾硅化、硅化等为主,指出研究区内侵入岩—潜火山岩钾化是铜、硫富集的重要蚀变标志。 相似文献
17.
The Okinawa Trough is different from other typical backarc spreading basins because the acidic vol-canic rock(pumice)is extensively distributed in it.Systematic mineralogical and petrochemical study on arepresentative core(Z14—5)to characterize the magmatic evolution of the Trough during its early spreading stage showed that the pumice magma was originally from the mantle,but underwent full crystallizationdifferentiation and was possibly contaminated by crust-derived material.With time,the acidic volcanic ac-tivities of the Okinawa Trough have an evolutional tendency of shifting to relatively basic magma activity.With further spreading of the Trough the magmatic activity will be intensified and the crust of the Troughwill develop from the transitional type to the oceanic type. 相似文献
18.
哈萨克斯坦Marsel探区下石炭统历经多年勘探未取得重大发现,资源发现结果与评价的资源量极不匹配。为重新认识该区致密气资源潜力,利用高频层序、测井、试油、地震等资料,对下石炭统烃源岩分布、储层岩性及物性、含气饱和度等地质参数进行了重新评价,采用蒙特卡洛模拟法和小面元容积法估算了下石炭统致密气资源量,并评价了资源的平面分布特征。结果表明,Marsel探区下石炭统谢尔普霍夫阶（C1sr）和维宪阶（C1v）有效烃源岩的分布面积可达1×104 km2,探区北部烃源岩w（TOC）普遍在1.2%以上,南部基本在0.2%~1.2%之间,均处于生气高峰阶段;储层主要为礁滩相碳酸盐岩,平均孔隙度约6%,渗透率多在10×10-3 μm2以下,与烃源岩互层接触,可形成大面积连续分布的致密气聚集。蒙特卡洛模拟法估算Marsel探区下石炭统致密气90%、50%、10%概率下的可采资源量分别为1 551亿,4 001亿,8 753亿m3。小面元容积法评价结果显示,Marsel探区下石炭统致密气分布面积达6 000 km2,可采资源量4 323亿m3,平均可采资源丰度为0.7亿m3/km2,属于特低丰度致密气资源,但北部ASSA、Terekhov、KNDK等"甜点区"可采资源丰度在0.8~2.5亿m3/km2。通过借鉴水平井体积压裂开采经验,优选"甜点"钻探提高单井产量,Marsel探区下石炭统仍有望实现效益开发。 相似文献
19.
本文综合了以往有关勘查和研究成果,总结浙江省江山—绍兴深断裂以南中生代火山岩区火山银矿床、点的时空分布、中型银矿床定位、成矿物质来源、成矿温度、矿石有用组分的垂直分带、矿物垂直分带、近矿围岩蚀变分带、矿体原生晕、稳定同位素、火山岩下的基本底物质组成差异与银矿的成矿关系等统计规律与成矿系列,认为浙东南火山岩区仍有良好的火山银（金、铅锌）矿找矿远景。 相似文献
20.
南任铁矿床位于莱州-安丘铁成矿带西北部,对其矿床成因认识存在较多争议。矿区内地层广布,构造、岩浆岩不发育。铁矿体呈透镜状产于滹沱纪粉子山群小宋组的底部层位,无穿插或交代围岩现象;围岩蚀变以蛇纹石化、绿泥石化为主,愈近矿体矿化蚀变愈强。矿石矿物以磁铁矿为主,少量黄铁矿、黄铜矿;脉石矿物主要为蛇纹石、绿泥石。矿石的结构构造主要为浸染状构造,半自形—他形粒状结构。岩矿石稀土元素含量表明磁铁矿主要为火山深成岩浆结晶分异形成,部分与火山沉积作用有关;磁铁矿化学成分特征也反映了这一点,综合认为其成因可能属海相火山岩型之火山岩浆-热液和火山沉积复合类型。在此基础上,总结了莱州-安丘铁成矿带上不同成因铁矿床的分布规律,为今后该地区铁矿勘查指明了方向。 相似文献