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1.
The superdeep North Caspian, South Caspian, and Barents basins have their sedimentary fill much thicker and the Moho, correspondingly, much deeper than it is required for crustal subsidence by lithospheric stretching. In the absence of large gravity anomalies, this crustal structure indicates the presence under the Moho of a thick layer of eclogite which is denser than mantle peridotite. Crustal subsidence in the basins can be explained by high-grade metamorphism of mafic lower crust. The basins produced by lithospheric stretching normally subside for the first ～100 myr of their history, while at least half of the subsidence in the three basins occurred after that period, which is another evidence against the stretching formation mechanism. According to the seismic reflection profiling data, stretching can be responsible for only a minor part of the subsidence in the Caspian and Barents basins. As for the South Caspian basin, there has been a large recent subsidence event in a setting of compression. Therefore, eclogitization appears to be a realistic mechanism of crustal subsidence in superdeep basins. 相似文献
2.
The large hydrocarbon basin of South Caspian is filled with sediments reaching a thickness of 20–25 km. The sediments overlie a 10–18 km thick high-velocity basement which is often interpreted as oceanic crust. This interpretation is, however, inconsistent with rapid major subsidence in Pliocene-Pleistocene time and deposition of 10 km of sediments because the subsidence of crust produced in spreading ridges normally occurs at decreasing rates. Furthermore, filling a basin upon a 10–18 km thick oceanic crust would require twice less sediments. Subsidence as in the South Caspian, of ≥20 km, can be provided by phase change of gabbro to dense eclogite in a 25–30 km thick lower crust. Eclogites which are denser than the mantle and have nearly mantle P velocities but a chemistry of continental crust may occur beneath the Moho in the South Caspian where consolidated crust totals a thickness of 40–50 km. The high subsidence rates in the Pliocene-Pleistocene may be attributed to the effect of active fluids infiltrated from the asthenosphere to catalyze the gabbro-eclogite transition. Subsidence of this kind is typical of large petroleum provinces. According to some interpretations, historic seismicity with 30–70 km focal depths in a 100 km wide zone (beneath the Apsheron-Balkhan sill and north of it) has been associated with the initiation of subduction under the Middle Caspian. The consolidated lithosphere of deep continental sedimentary basins being denser than the asthenosphere, can, in principle, subduct into the latter, while the overlying sediments can be delaminated and folded. Yet, subduction in the South Caspian basin is incompatible with the only 5–10 km shortening of sediments in the Apsheron-Balkhan sill and south of it and with the patterns of earthquake foci that show no alignment like in a Benioff zone and have mostly extension mechanisms. 相似文献
3.
《Russian Geology and Geophysics》2014,55(5-6):649-667
Consolidated crust in the North Barents basin with sediments 16–18 km thick is attenuated approximately by two times. The normal faults in the basin basement ensure only 10-15% stretching, which caused the deposition of 2–3 km sediments during the early evolution of the basin. The overlying 16 km of sediments have accumulated since the Late Devonian. Judging by the undisturbed reflectors to a depth of 8 s, crustal subsidence was not accompanied by any significant stretching throughout that time. Dramatic subsidence under such conditions required considerable contraction of lithospheric rocks. The contraction was mainly due to high-grade metamorphism in mafic rocks in the lower crust. The metamorphism was favored by increasing pressure and temperature in the lower crust with the accumulation of a thick layer of sediments. According to gravity data, the Moho in the basin is underlain by large masses of high-velocity eclogites, which are denser than mantle peridotites. The same is typical of some other ultradeep basins: North Caspian, South Caspian, North Chukchi, and Gulf of Mexico basins. From Late Devonian to Late Jurassic, several episodes of rapid crustal subsidence took place in the North Barents basin, which is typical of large petroleum basins. The subsidence was due to metamorphism in the lower crust, when it was infiltrated by mantle-source fluids in several episodes. The metamorphic contraction in the lower crust gave rise to deep-water basins with sediments with a high content of unoxidized organic matter. Along with numerous structural and nonstructural traps in the cover of the North Barents basin, this is strong evidence that the North Barents basin is a large hydrocarbon basin. 相似文献
4.
Late Cretaceous-Eocene marginal seas in the Black Sea-Caspian region: Paleotectonic reconstructions 总被引：1，自引：0，他引：1
A series of seven reconstructions is presented to illustrate the evolution of marginal seas in the Black Sea-South Caspian segment of the margin of the Tethys Ocean from the Late Jurassic to the middle Eocene. After Middle Jurassic inversion and until the Aptian Age, no marginal (backarc) basins were formed in the region, while the Pontides-Rhodope margin developed in the passive regime. The retained relict of the Late Triassic-Early Jurassic backarc basin includes the southeastern part of the Greater Caucasus, the northern part of the South Caspian Basin, and the shallow-water Kopetdagh Basin. The basins of the southern slope of the Greater Caucasus, Balkans (Nish-Trojan Trough), and Dobrogea developed as flexural foredeeps in front of the Middle Jurassic fold systems. The next, Aptian-Turonian epoch of opening of marginal seas was related to the origination of subduction zones at the Pontides-Rhodope margin and to the incipient consumption of the Vardar Basin lithosphere with formation of the West Black Sea Basin and its western continuation in the Bulgarian Srednogorie. The backarc rifting in the Greater Caucasus resulted in transformation of the foredeep into the backarc basin. Two basins approximately 2000 km in total extent were separated by the bridge formed by the Shatsky and Andrusov rises. The last, late Paleocene-middle Eocene epoch of the formation of backarc basins was associated with the newly formed subduction zone south of the Menderes-Taurus Terrane that collided with the active margin in the early Paleocene. The Greater Caucasus Basin widened and deepened, while to its south the East Black Sea Basin, the grabens in the Kura Depression, and the Talysh Basin, all being separated by a chain of uplifts, opened. The Paleogene South Caspian Basin opened in the course of the southward motion of the Alborz volcanic arc at the late stage of closure of the Iranian inner seas. 相似文献
5.
Many geophysical characteristics of the Caspian and Black Seas' deep basins are similar, having: suboceanic type of the crust, low average seismic velocity, absence of earthquakes and relatively small variation of magnetic anomalies. However, the sediments in the Caspian Sea deep basin are folded whereas in the Black Sea they are approximately horizontal. The Caspian Sea also has a far greater thickness of sediment accumulation.
The deep basins of the Caspian, Black and Mediterranean seas represent a sequence having similar crustal structures but with a decreasing thickness of sediments and consolidated layer, in that order. It is possible that the intensive sinking and accumulation of sediments began earliest in the Caspian Sea and spreaded continuously to the Black Sea and then the Mediterranean Sea. The Caspian and Black Sea deep basins have existed for long time (perhaps from Paleozoic time or even earlier) as areas with a specific and related type of evolution. 相似文献
6.
The South Caspian sedimentary basin is a unique area with thick Mesozoic-Cenozoic sediments (up to 30–32 km) characterized by an extremely high fluid generation potential. The large amount of active mud volcanoes and the volumes of their gas emissions prove the vast scale of fluid generation. Onshore and offshore mud volcanoes annually erupt more than 109 cubic meters of gases consisting of CH4 (79–98%), and a small admixture of C2H6, C3H8, C4H10, C5H12, CO2, N, H2S, Ar, He. Mud volcanism is closely connected to the processes occurring in the South Caspian depression, its seismicity, fluctuations of the Caspian Sea level, solar activity and hydrocarbon generation.The large accumulations of gas hydrates are confined to the bottom sediments of the Caspian Sea, mud volcanoes crater fields (interval 0–0.4 m, sea depth 480 m) and to the volcanoes body at the depth of 480–800 from the sea bottom. Resources of HC gases in hydrates saturated sediments up to a depth of 100 m and are estimated at 0.2×1015–8×1015 m3. The amount of HC gases concentrated in them is 1011–1012 m3.The Caspian Sea, being an inland closed basin is very sensitive to climatic and tectonic events expressed in sea level fluctuations. During regressive stages as a result of sea level fall and the reducing of hydrostatic pressure the decomposition of gas hydrates and the releasing of a great volume of HC gases consisting mainly of methane are observed.From the data of deep drilling, seismoacoustics, and deep seismic mud volcanic activity in the South Caspian Basin started in the Lower Miocene. Activity reached its highest intensity at the boundary between the Miocene and Pliocene and was associated with dramatic Caspian Sea level fall in the Lower Pliocene of up to 600 m, which led to the isolation of the PaleoCaspian from the Eastern ParaTethys. Catastrophic reduction of PaleoCaspian size combined with the increasing scale of mud volcanic activity caused the oversaturation and intoxication of water by methane and led to the mass extinction of mollusks, fishes and other groups of sea inhabitants. In the Upper Pliocene and Quaternary mud volcanism occurred under the conditions of a semi-closed sea periodically connected with the Pontian and Mediterranean Basins. Those stages of Caspian Sea history are characterized by the revival of the Caspian organic world.Monitoring of mud volcanoes onshore of the South Caspian demonstrated that any eruption is predicted by seismic activation in the region (South-Eastern Caucasus) and intensive fluid dynamics on the volcanoes. 相似文献
7.
V. A. Nikishin N. A. Malyshev A. M. Nikishin V. V. Obmetko 《Moscow University Geology Bulletin》2011,66(6):377-384
Based on the new geophysical survey data within the South Kara basin, a system of rift troughs was established. The time of
formation of the rifts was the Late Permian-Early Triassic by analogy with that of the West Siberian basin. It is probable
that inversion processes took place in the Middle Triassic in rifts, located close to Novaya Zemlya. Morphologically, the
rifts are represented mainly by semi-grabens. In plan view, they form closed isometric basins, similar in shape to pull-apart
basins, which formed as result of sinistral transtension. The Upper Triassic sediments are widespread throughout the basin,
forming the lower part of the post-rift sedimentary cover. 相似文献
8.
俄罗斯的内陆和海上大约有 30个盆地赋含油气。这些盆地囊括了所有的以板块构造为分类准则的盆地类型 ,即 :( 1)内陆裂谷和超裂谷台坳 ;( 2 )现代大陆边缘的上叠台坳 ;( 3)与冲断褶皱系统毗邻的被动大陆边缘和 ( 4 )岩石圈板块聚敛带 (即大洋板块俯冲到大陆板块之下的地带 )。第一类盆地包括广袤的西西伯利亚超拗拉槽盆地和西伯里亚的Viluy拗拉槽等。第二类包括一些具油气远景的俄罗斯北冰洋盆地和里海边缘盆地。第三类包括乌拉尔前渊的伏尔加—乌拉尔盆地 (Volga—Urals)、大高加索前渊的亚速—库班盆地 (Azov—Kuban)和捷列克—里海盆地 (Terek—Caspian)以及其它盆地。被动大陆边缘经历了 2个到 3个演化阶段 ,主要油气聚集期通常对应后裂谷期。第四类盆地是指远东和俄罗斯东北部的盆地。在鄂霍次克海 (萨哈林岛—鄂霍次克和西堪察加—鄂霍次克 )已经发现了油气田 ,有一些盆地 (Anadyr和Khatyrka)已被证实含有油气。裂陷作用也控制着弧后盆地的形成。盆地的地球动力学特征控制着油气藏的分布、圈闭类型和资源富集程度。俄罗斯的油气富集区主要集中在伏尔加—乌拉尔、西西伯利亚、铁梓哥—伯朝阿 (Timano—Pechora)和萨哈林 (Sakhalin)地区 ,大约 4 5%的资源量被采出 ,其他盆地有很好的远景。里海的俄? 相似文献
9.
为了系统认识新生代南海沉积盆地形成演化过程和成盆机制, 在对南海及其周缘区域构造和沉积研究进展调研的基础上, 利用覆盖南海主要盆地新近采集和重处理的地震剖面开展详细的构造-地层分析.基于盆地结构构造、演化特征和成盆动力学的差异性, 以红河-越东-Lupar线大型走滑构造带为界, 将南海及其周缘沉积盆地划分为古南海俯冲拖拽构造区沉积盆地群和挤出-逃逸构造区沉积盆地群, 前者主要是古南海俯冲及其所引起的区域构造变形形成的盆地, 包括北部湾、琼东南、珠江口、曾母、北康、文莱-沙巴和礼乐等盆地, 后者是印度-欧亚大陆碰撞导致印支地块挤出和旋转形成的盆地, 如莺歌海、湄公、中建南、万安等盆地.最后, 结合周缘板块动力学事件和本次对盆地构造研究的成果, 特别是盆地中重要界面属性的重新厘定, 建立了南海及其周缘沉积盆地演化过程. 相似文献
10.
In this study, an extensive paleomagnetic sampling (70 sites) was carried out in north-eastern Iran with the aim of reconstructing the rotation history of the outer margin of the Eurasia-Arabia collision area represented by the Ala-Dagh, Binalud and Kopeh-Dagh mountain belts. We sampled the red beds units from the Lower Cretaceous Shurijeh Fm. and from the Middle-Upper Miocene Upper Red Fm (URF). Paleomagnetic results from all the sampled areas show a homogeneous amount of CW rotations measured in the above-mentioned Formations. These paleomagnetic results suggest that the oroclinal bending process that caused the curvature of Alborz mountain belt in north Iran after the Middle-Late Miocene, also extended to the Ala-Dagh, Binalud and Kopeh-Dagh mountain belts, at the north-eastern border of the Arabia-Eurasia deforming zone.Based on our paleomagnetic results and on GPS, seismological, geomorphological and structural data available in the area, a hypothesis of tectonic evolution of the northern Iran-South Caspian Basin area, from Middle-Late Miocene to Present, is here proposed. In this model, the initiation of the oroclinal bending processes in northern Iran occurred about 6–4 myr ago, related to the impinging of North Iran between the South Caspian block and the southern margin of the Turan platform, driven by the northward subduction of the South Caspian basement under the Aspheron-Balkhan Sill. As paleomagnetic results from this study show a pattern of vertical axis rotations that is inconsistent with the present-day kinematics of the northern Iranian blocks as described by seismicity and GPS data, we suggest that the tectonic processes responsible for the bending of northern Iran mountain chains are no longer active and that the westward motion of the South Caspian basin, and therefore the initiation of opposite strike-slip motion along the Ashk-Abad and Shahrud faults, occurred very recently (∼2 My ago). We therefore propose that initiation of the northward subduction of the South Caspian basin below the Apsheron-Balkhan Sill and the westward extrusion of the South Caspian block did not occur at the same time, with the former occurring between the late Miocene and the Pliocene, and the latter during the Pleistocene. 相似文献
11.
南海是中国唯一发育有洋壳的边缘海,是世界四大海洋油气聚集中心之一。油气勘探表明,南海的油气田分布在北部、西部和南部陆缘沉积盆地内,而大中型油气田集中分布在西部海域盆地中,自北而南有莺歌海—琼东南盆地、万安盆地、湄公盆地、曾母盆地和文莱—沙巴盆地,且以含气为主,含油次之。此外,这一区域深水区还存在多个潜在的大型含油气盆地。研究发现,南海的油气分布与深部岩石圈结构有密切关系。在构造上,南海的含油气盆地位于岩石圈块体边缘或之上,受控于大型岩石圈断裂的发育与演化。在油气富集的盆地中,莫霍面显著凸起,与盆地基底形成镜像,地壳厚度最薄处仅数千米厚,热流值明显较周围地区高,热岩石圈厚度大大减薄。地震层析成像结果反映,这些盆地深部发育一条规模宏大的北西向上地幔隆起带,自红河口向东南穿越南海西部海盆,一直延伸到婆罗州东北部地区,在宏观上控制了南海的油气分布与富集。 相似文献
12.
On the basis of reflected wave hodographs interpreted by the method of homogeneous functions, the section of the lithosphere across the Caucasus, Caspian Sea and Turan Plate was obtained without the use of any preliminary section model. In a section of more than 1000 km, mantle and crustal structures and junction patterns between them are seen down to 60 km within the limits of the Kura Basin and the South and Middle Caspian basins and the Turan Plate. The section of the South Caspian Basin is generally consistent with the ideas of E.V. Artyushkov concerning its structure. A sedimentary layer of up to 30 km thick is underlain by a thinned crust about 10 km thick and by high-velocity mantle. The Turan Plate consists of three layers, which are typical for cratons that are about 50 km thick. 相似文献
13.
中国南海不同板块边缘沉积盆地构造特征 总被引：8，自引：1，他引：7
基于科学考察区域联测剖面资料,结合南海大地构造背景研究,对南海主要的新生代沉积盆地的构造特征进行了对比分析。研究表明,区域联测剖面穿越的沉积盆地的构造特征具有显著的差异,具体表现在大地构造背景、重磁场特征、盆地基底、断裂性质、构造线方向以及火成岩发育等方面。南海断裂的发育与盆地形成具有密切的关系,南海北部主要表现为NE向张性断裂控制的沉积盆地;西部主要表现为NW向和近SN向走滑断裂控制的沉积盆地;南部比较复杂,张性、压性、剪性断裂都有发育,但以NE向的南沙海槽逆冲断裂及其控制的南沙海槽盆地最具代表性;东部主要指南海中央海盆,断裂和海底火山共同控制了该区上新世-第四纪沉积。 相似文献
14.
板块俯冲碰撞拼合带是盆山相互作用最为强烈的地区,发育有弧前、弧间及弧后多种类型的盆地,沉积物的剥蚀搬运作用极为活跃。证据显示,沉积物搬运充填过程在构造—古地理控制型盆地中具有一定的演变规律,伴随盆地演化,沉积物轴向搬运与横向搬运呈此消彼长的互动关系。南海南北两侧均发育了大型板块俯冲拼合带及相关的沉积盆地,在盆地发育早期沉积物沿盆地长轴方向分别形成昆莺琼古河和巽他古河,以轴向搬运的方式分别把越南中部及马来半岛沉积物由西向东输送到南海,形成大型三角洲及前三角洲深水扇沉积,河流发育位置均在板块拼合转折地段。在盆地发育的成熟阶段,沉积物以横向搬运的方式进入盆地,与轴向搬运沉积物形成混合堆积。轴向搬运是洋陆碰撞拼合盆地中一种重要的沉积物搬运途径,主要受盆地形成时的构造古地理控制。 相似文献
15.
板块俯冲碰撞拼合带是盆山相互作用最为强烈的地区,发育有弧前、弧间及弧后多种类型的盆地,沉积物的剥蚀搬运作用极为活跃。证据显示,沉积物搬运充填过程在构造—古地理控制型盆地中具有一定的演变规律,伴随盆地演化,沉积物轴向搬运与横向搬运呈此消彼长的互动关系。南海南北两侧均发育了大型板块俯冲拼合带及相关的沉积盆地,在盆地发育早期沉积物沿盆地长轴方向分别形成昆莺琼古河和巽他古河,以轴向搬运的方式分别把越南中部及马来半岛沉积物由西向东输送到南海,形成大型三角洲及前三角洲深水扇沉积,河流发育位置均在板块拼合转折地段。在盆地发育的成熟阶段,沉积物以横向搬运的方式进入盆地,与轴向搬运沉积物形成混合堆积。轴向搬运是洋陆碰撞拼合盆地中一种重要的沉积物搬运途径,主要受盆地形成时的构造古地理控制。 相似文献
16.
ZHAO Honggang LI Ying CHANG Xiangchun LI Zengxue LIU Haiyan ZHAO Cunliang 《《地质学报》英文版》2021,95(1):121-130
The coal-forming characteristics,as well as the similarities and differences between epicontinental sea basins and continental marginal sea basins developed during different time periods,were analyzed in this study by adopting comparative analysis thoughts and methods.The results obtained in this study revealed that epicontinental basins and marginal sea basins are both characterized by the main development of thin coal seams or extremely thin coal seams.In addition,changes in sea levels were determined to be the main controlling factors for coal formation,and there were similarities in the continent-sea interactions and coal-forming sedimentary systems of the different basins.However,there were also significant differences observed in the sea level change events,basin basement structural characteristics,coal seam stability levels,accumulation and aggregation characteristics,and the migration patterns of coal-forming materials.For example,the marginal sea basins in the South China Sea were found to be characterized by strong tectonic activities,diversity and complexity.The basin structures showed complex patterns of depressions,uplifts and concave or sag uplifts,which tended to lead to greater complexity in the paleogeographic patterns of the coal formations.This had subsequently resulted in complex coal-forming processes and paleogeographic characteristics,in which the coal-forming zones displayed bead-like distributions,and the enrichment areas and centers were scattered.The practical significance of studying the similarities and differences of the coal-forming characteristics between epicontinental basins and marginal sea basins is that the results can potentially be used to guide the predictions of coal-measure coal seam distributions in South China Sea,as well as provide valuable guidance for future explorations of natural gas reservoirs related to coal measures in the South China Sea area. 相似文献
17.
The 3-D lithospheric-density model for the southeastern part of the Caspian Sea and the Transcaspian area, practically coinciding with the territory of the Turkmen Republic, has been constructed based on geophysical data and in accordance with the principle of isostasy. From the model selected the anomalous density of the subcrustal layer between the Moho discontinuity and the 100-km depth level is found to be — 100 kg/m3 under the Tien-Shan, − 50 kg/m3 under the Kopet-Dag mountain area, + 80 kg/m3 under the central region of the South Caspian basin, −50 kg/m3 under the eastern part of the basin, known as the West Turkmenian depression, and + 45 kg/m3 under the Murgab depression.
Significant disturbances of the local isostasy are determined both in the northern and central areas of the South Caspian basin and also in the area of the Kara-Bogaz swell of the Turan platform and for the Kopet-Dag foredeep. indicating a high level of stresses in the lithosphere. The shape of the Turan plate determined by the seismic profiling is accounted for by elastic deformation resulting from the forces acting on the southern edge of the plate in the area of the Turan plate-Kopet-Dag collision. The elastic thickness of the Turan plate is estimated as 25 ± 5 km. The results obtained seem to confirm the idea that the decomposition of the Turan plate has taken place in the zone of the plates interaction and the decomposed material is situated under the Kopet-Dag ridge.
We propose that the Kara-Bogaz swell is supported by the mantle material upwelling whereas the subsidence of the adjacent part of the South Caspian basin may be due to the downgoing mantle flow i.e., a small convection cell is suggested in that area. 相似文献
18.
The distribution of oil and gas resources in the South China Sea and adjacent areas is closely related to the structural pattern that helped to define the controlling effect of deep processes on oil-bearing basins.Igneous rocks can record important information from deep processes.Deep structures such as faults,basin uplift and depression,Cenozoic basement and magnetic basement are all the results of energy exchange within the earth.The study of the relationship between igneous rocks and deep structures is of great significance for the study of the South China Sea.By using the minimum curvature potential field separation technique and the correlation analysis technique of gravitational and magnetic anomalies,the fusion of gravitational and magnetic data reflecting igneous rocks can be obtained,through which the igneous rocks with high susceptibility/high density or high susceptibility/low density can be identified.In this study area,igneous rocks do not develop in the Yinggehai basin,Qiongdongnan basin,Zengmu basin and Brunei-Sabah basin whilst igneous rocks with high susceptibility/high density or high susceptibility/low density are widely-developed in other basins.In undeveloped igneous areas,faults are also undeveloped the Cenozoic thickness is greater,the magnetic basement depth is greater and the Cenozoic thickness is highly positively correlated with the magnetic basement depth.In igneously developed regions,the distribution pattern of the Qiongtai block is mainly controlled by primary faults,while the distribution of the Zhongxisha block,Xunta block and Yongshu-Taiping block is mainly controlled by secondary faults,the Cenozoic thickness having a low correlation with the depth of the magnetic basement. 相似文献
19.
南美洲含油气盆地和油气分布综述 总被引：2，自引：2，他引：0
南美洲是世界上的主要油气产区之一,近年来取得了一系列重大勘探突破。2007年以来,桑托斯盆地盐下一系列巨型油气田的发现表明南美洲,特别是被动陆缘盆地深水盐下层系有着巨大的勘探潜力。以获取的最新油气田储量资料为基础,探讨了南美洲的油气资源在不同类型盆地、不同地区和不同层系的分布特征。统计分析表明前陆盆地油气最富集,其次是被动陆缘盆地。南美洲的前陆盆地沿安第斯山展布,南段和北段为新生代前陆盆地,中段为古生代前陆盆地。南段、中段和北段前陆盆地的主要储集层分别为侏罗系-白垩系、石炭系和白垩系-新近系。经历了被动陆缘演化阶段的前陆盆地是南美洲油气最富集的盆地,典型的代表为东委内瑞拉盆地和马拉开波盆地。被动陆缘盆地分布于南美洲大陆的东部沿海区,油气主要聚集于白垩系、古近系和新近系。在被动陆缘盆地中,发育有蒸发岩的盆地油气更为富集,坎波斯盆地和桑托斯盆地是这类盆地的典型代表。 相似文献
20.
华北克拉通北缘与盆地流体有关的若干矿床实例 总被引：7，自引：0，他引：7
与华南一样,在华北克拉通北缘及其增生带也有与盆地流体有关的矿床产出。矿床的生成总是与张裂型沉积盆地有关。根据基底大地构造性质和盆地动力学演化特征,可划分出两个与盆地流体有关的、特征各异的金属成矿省：1)华北克拉通北部元古代金．多金属成矿省,在克拉通内部,边缘元古代裂谷增生期生成沉积喷流型硫多金属矿床和沉积岩容矿的微细浸染型金矿床;2)大兴安岭中南段古生代锡．多金属成矿省,在克拉通北缘早／晚古生代增生带的张裂型沉积盆地内分别生成各具特征的铅锌/锡-多金属矿床。 相似文献