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1.
《International Geology Review》2012,54(3):282-295
The development of the Yugoslavian, Albanian, and Italian segments of the Mediterranean geosyncline is compared, using the province of Montenegro as the standard for correlation of the paleogeographic analysis during the Alpine tectonic cycle. The tectonic zones, characteristic of the Montenegro area are four in number and given as the Maritime zone with rocks ranging from Upper Carboniferous to Oligocene; the old Montenegro zone consisting of Triassic, Jurassic, Cretaceous and upper Oligocene sediments; the Ku?a zone deposits ranging from Upper Permian through Mesozoic; and the Durmitor zone with Devonian, Carboniferous, Permian, Triassic, and Jurassic sedimentary and volcanic-sedimentary bodies and Upper Cretaceous flysch.—IGR Staff. 相似文献
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3.
M. H. Basavaraju B. C. Jaiprakash L. Chidambaram M. Ayyadurai 《Journal of the Geological Society of India》2016,88(4):407-420
The first exploratory well Arani–A was drilled in the Palar basin to a depth of 2400m and terminated within the granitic basement.This well offered the first ever opportunity to understand biostratigraphy, sedimentation history and depositional environment of the entire sedimentary column based on arenaceous foraminifera, spores, pollen and dinoflagellate cyst assemblages. Previous studies on few scattered outcrops around Sriperumbudur, Chengalpattu and Sathyavedu areas have documented palynofossil assemblage of Neocomian–Aptian age. The present study reveals the presence of middle Jurassic (Bajocian-Callovian) sediments (2360-1725 m) resting on the granitic basement. The sediments are interpreted to have deposited under lacustrine/estuarine conditions with high tides providing occasional marine influence. The middle Jurassic sediments are conformably overlain by late Jurassic (Oxfordian–Tithonian) sediments (1725 - 950 m). The late Jurassic sediments have been inferred to have got deposited under fluctuating near shoremarginal marine conditions. There is a 55m thick boulder bed (950 - 895 m) separating the overlying Valanginian sediments. Early Cretaceous (Valanginian-Early Albian) sediments are developed in the interval from 895-50m. The boulder bed possibly corresponds to the missing Berriasian stage of the earliest Cretaceous representing an unconformity of the order of ~5 Ma across Jurassic-Cretaceous boundary. These sediments are inferred to have deposited under shallow inner neritic conditions. The sediments from 50m to surface consist mainly of lateritic sandstone and alluvium. The sedimentary history of Palar basin began in Bajocian stage of middle Jurassic (170-168 Ma) and ended in early Albian stage of early Cretaceous (113-105 Ma). The late Albian marine transgression which facilitated huge sedimentation in Cauvery and Krishna-Godavari basins has bypassed the Palar basin thus adversely affecting the hydrocarbon potential. 相似文献
4.
该文是用地洼学说的观点论述整个青藏高原的大地构造性质,并从该区的构造层的结构、岩浆活动、沉积建造、构造型相、地震活动、地热、地球物理和现代地貌等特点来论证和分析它应归属地洼区。从地洼发展时期来看,它应归属“中亚期”地洼区。青藏高原北部进入地洼阶段较早,从侏罗纪时开始;而南部较晚,最晚是在渐新世时才进入地洼发展阶段。 相似文献
5.
《Russian Geology and Geophysics》2014,55(5-6):668-680
The effect of tectonic processes on the petroleum potential of the Upper Jurassic and Cretaceous sediments is estimated by the example of the deposits in the north of the Aleksandrov arch. The formation history of the structures bearing Upper Jurassic and Cretaceous hydrocarbon (HC) pools is discussed.The results obtained lead to the conclusion that anticlinal traps complicated by faults cutting the Meso-Cenozoic sedimentary cover are the most promising for the formation of large HC pools in Cretaceous sand reservoirs. These traps serve as channels for HC migration from the oil-producing rocks of the Bazhenovo Formation into the overlying reservoirs. In the Upper Jurassic sediments, anticlinal traps free from Cenozoic faults are the most promising for HC accumulation. These conclusions are confirmed by a number of examples. 相似文献
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Martin Bak Hansen Holger Lykke-Andersen Ali Dehghani Dirk Gajewski Christian Hübscher Morten Olesen Klaus Reicherter 《International Journal of Earth Sciences》2005,94(5-6):1070-1082
A dense grid of multichannel high-resolution seismic sections from the Bay of Kiel in the western Baltic Sea has been interpreted
in order to reveal the Mesozoic and Cenozoic geological evolution of the northern part of the North German Basin. The overall
geological evolution of the study area can be separated into four distinct periods. During the Triassic and the Early Jurassic,
E–W extension and the deposition of clastic sediments initiated the movement of the underlying Zechstein evaporites. The deposition
ceased during the Middle Jurassic, when the entire area was uplifted as a result of the Mid North Sea Doming. The uplift resulted
in a pronounced erosion of Upper Triassic and Lower Jurassic strata. This event is marked by a clear angular unconformity
on all the seismic sections. The region remained an area of non-deposition until the end of the Early Cretaceous, when the
sedimentation resumed in the area. Throughout the Late Cretaceous the sedimentation took place under tectonic quiescence.
Reactivated salt movement is observed at the Cretaceous Cenozoic transition as a result of the change from an extensional
to compressional regional stress field. The vertical salt movement influenced the Cenozoic sedimentation and resulted in thin-skinned
faulting. 相似文献
7.
《International Geology Review》2012,54(5):577-584
The study of Taymyr has been difficult because of the poor accessibility of the region. Eight geotectonic zones have been identified. Six of these, from lower Proterozoic to Upper Paleozoic mark a geosynclinal development; the seventh, Triassic, is a post-inversion transition to the eighth, a Mesozoic-Cenozoic stage of young platform development. The geosynclinal cycle in Severnaya Zemlya was shorter than in Taymyr, with the inversion occurring at the close of the Silurian and the platform conditions initiated with the Devonian. The Taymyr geosyncline migrated southeast, advancing over the sinking margin of the Siberian platform, a distance of about 200 km, between early Proterozoic and the close of the Paleozoic. The post-geosynclinal structural stage is represented by Jurassic to Quaternary deposits, in the Taymyr low and in minor troughs. A Lower Cretaceous coal basin is present in Taymyr. Oil shows are associated with salt domes in the Khatanga and Ust-Yenisey troughs. A series of sulfide ore deposits are associated with traprocks in the Byrranga range. Hydrothermal ores are associated with minor subalkalic intrusions. --Scripta Technica, Inc. 相似文献
8.
《International Geology Review》2012,54(12):1150-1158
Lower and Middle Jurassic coal-bearing deposits occur in the western part of the region under consideration (the Irkutsk basin, the Trans -Baikalia depressions). Far to the east these are found only in the Upper Aldan basin. Upper Jurassic sediments are more widespread, occurring within the southern part of the Lena basin as well as in the Upper Aldan, Amur-Zeya and Bureya basins. The principal coal-forming stage dates back to the earlier Cretaceous; with this are associated most thick and productive strata of the Lena and Bureya basins as well as all coal-bearing strata of the Zyryansk, Suchansk and Suifansk basins. Age determinations of individual coal-bearing suites are chiefly based upon the study of plant remains and establishing leading paleofloristical complexes. At the present the complexes of the Upper Jurassic and Lower Cretaceous sediments are best known. ,The composition of one-age complexes varies with the movement from N to S conditioned by the then existing botanic-geographical zonality. — Auth. English summ. 相似文献
9.
Apatite fission-track analysis was applied to Triassic and Cretaceous sediments from the South-Iberian Continental Margin to unravel its thermal history. Apatite fission-track age populations from Triassic samples indicate partial annealing and point to a maximum temperature of around 100–110 °C during their post-depositional evolution. In certain apatites from Cretaceous samples, two different fission-track age populations of 93–99 and around 180 Ma can be distinguished. Track lengths associated with these two populations enabled thermal modelling based on experimental annealing and mathematical algorithms. These thermal models indicate that the post-depositional thermal evolution attained temperatures ≤ 70 °C, which is consistent with available vitrinite-reflectance data. Thermal modelling for the Cretaceous samples makes it possible to decipher a succession of cooling and heating periods, consisting of (a) a late Carboniferous–Permian cooling followed by (b) a progressive heating episode that ended approximately 120 Ma at a maximum T of around 110 °C. The first cooling episode resulted from a combination of factors such as: the relaxation of the thermal anomaly related to the termination of the Hercynian cycle; the progressive exhumation of the Hercynian basement and the thermal subsidence related to the rifting of the Bay of Biscay, reactivated during the Late Permian. Jurassic thermal evolution deduced from the inherited thermal signal in the Cretaceous sediments is characterized by progressive heating that ended around 120 Ma. This heating episode is related to thermal subsidence during Jurassic rifting, in agreement with the presence of abundant mantle-derived tholeiitic magmas interbedded in the Jurassic rocks. The end of the Jurassic rifting is well marked by a cooling episode apparently starting during Neocomiam times and ending at surface conditions by Albian times. 相似文献
10.
The well LF35-1-1 in the eastern Pearl River Mouth basin (PRMB) of the northern South China Sea revealed nnmetamorphosed Middle-Late Jurassic neritic-bathyal sediments and Cretaceous fluvial-lacustrine sediments.Three tectonic movements were identified in Late Jurassic to Early Cretaceous,late Early Cretaceous,and Late Cretaceous to Paleocene,respectively.The Late Jurassic marine facies mainly contain the hydrocarbon source and reservoir-seal assemblages,providing a main exploration target. 相似文献
11.
四川盆地侏罗纪至早白垩世沉积旋回与构造隆升的关系 总被引：14，自引：0，他引：14
为弄清四川盆地在侏罗至白垩纪的演化及古气候特征, 对该时期的沉积相及生物特征进行了综合分析.研究证明, 侏罗纪至白垩纪四川盆地周边山系的构造活动可分为两个旋回.早、中侏罗世为第一个旋回, 晚侏罗至早白垩世为第二个旋回.每个旋回的早期多以湖相泥页岩、砂岩夹介壳灰岩的广泛发育为特征, 沉积物颗粒细、厚度较小, 反映出相对稳定的构造背景.晚期则以大套杂色的河流相砂泥岩、巨厚的河流相及洪冲积相砂泥岩、砂砾岩及砾岩的出现为特征, 且厚度巨大, 反映出盆地周边山系强烈的构造隆升.从沉积物及生物特征上分析, 第一个旋回期间, 四川盆地处在一个温暖湿润的环境之下, 而从第二个旋回开始, 总体则以潮湿、炎热的气候为特征 相似文献
12.
F. K. Rickwood 《Australian Journal of Earth Sciences》2013,60(2):63-82
Abstract The oldest rocks in the Western Highlands of New Guinea are granite and metamorphic rocks, and these are unconformably overlain by an incomplete marine succession of Permian, Upper Jurassic, Cretaceous, Eocene, Oligocene and Miocene sediments with a maximum thickness of 34,000 ft. The sedimentary succession in the east of the region is much thicker than in the west. Jurassic seas transgressed from the east. Studies of the faunas and petrology of the sediments show that the western part of the region was out of range of the sources of Cretaceous vulcanism and slow pelagic sedimentation continued into the Lower Miocene. By the Middle Miocene a volcanic island arc had developed in the vicinity of the Lai Syncline and the sediments are of shallow-water type, rich in volcanic debris. Both sediments and basement were folded into a number of anticlines and synclines at the end of the Pliocene. Vigorous erosion was followed by extensive Pleistocene vulcanism in the west. Pleistocene glaciation occurred in the Bismarck Range down to about 13,000 feet above sea-level. 相似文献
13.
S. V. Rud’ko 《Lithology and Mineral Resources》2018,53(4):307-323
The paper presents results of the lithological study of Upper Jurassic limestones, flyschoids and limestone breccias on the southern side of the Baidar Valley in the Crimean Mountains. Study of the microfacies revealed that the limestones are represented by deposits on lagoons, platform edge shoals, reefs, and forereef aprons on the carbonate platform slope. Flyschoids include deposits in the distributive turbidite channels and hemipelagic sediments in the deep-water part of the basin. Limestone breccias were formed by gravitation flows on the carbonate platform toe-of-slope and slope. The presence of gravitation deposits in the Upper Jurassic carbonate complexes of the Crimean Mountains can testify to the primary clinoform structure of this sedimentary sequence. Comparison of the obtained sedimentological data made it possible to reconstruct the facies model of the Crimean carbonate platform and main episodes of its formation. Development of the carbonate shelf was related to two transgressive-regressive cycles. A dome-shaped reef was formed away from the coast at the initial (Oxfordian) stage. The carbonate platform was formed at the early Kimmeridgian lowstand stage when sediments were deposited in the internal part of the platform adjacent to land. In the late Kimmeridgian and early Tithonian, configuration of the carbonate platform profile resembled a distally steepened ramp, and its active progradation and shelf expansion took place in the course of transgression. Regression in the late Tithonian–early Berriasian led to regressive transformation of the ramp into platform with a flattened shallow-water shelf. Tectonic deformations at the Jurassic/Cretaceous transition promoted the formation of megabreccias on the carbonate platform foreslope. The tectonically reworked rock sequence of the “extinct” carbonate platform was overlapped transgressively by the upper Berriasian or lower Valanginian, relatively deep-water deposits of the Cretaceous platform cover. 相似文献
14.
中侏罗世-早白垩世华北地台东部的北黄海盆地受古亚洲构造体制向滨太平洋构造体制转换的影响,其构造演化经历了伸展-反转挤压-伸展的转变.构造体制的差异不但表现在大地构造性质及其产生的地质效应上,也表现在盆地沉积特征、古生物及古气候等方面.本文以北黄海盆地东部坳陷X1井中侏罗统至下白垩统为研究对象,利用泥岩元素地球化学特征对古气候的指示,结合盆地沉积特征及古生物资料,对古气候演化展开研究.研究显示,中侏罗世-早白垩世X1井泥岩样品的Sr/Cu比值（2.12~34.10）、Sr/Ba比值（0.16~1.60）、Rb/Sr比值（0.13~1.23）、Fe2O3/FeO比值（0.22~11.10）、V/Cr比值（0.91~1.78）、V/Sc比值（4.89~8.33）、Ni/Co比值（1.14~3.85）、δU比值（0.50~0.84）和U/Th比值（0.11~0.24）的纵向变化反映古气候经历了温湿→整体湿润、短暂干热→干热的演化.沉积物经历了暗色细粒沉积物为主→灰色、灰色夹灰绿色、灰色与红褐色互层细粒沉积物为主→灰色粗粒沉积物和红褐色、灰黄色细粒沉积物为主的变化.古生物经历了喜湿植物丰富→喜热植物出现→喜热植物丰富的过程.结果表明,受古亚洲构造体制和滨太平洋构造体制的影响,华北地台向北漂移,北黄海盆地古气候经历了由中侏罗世-晚侏罗世早期以温湿气候为主,至晚侏罗世晚期-早白垩世早期整体相对湿润,出现短暂干热气候,到早白垩世中期-早白垩世晚期为干热气候的演化.北黄海盆地中侏罗世-早白垩世古气候由温湿向干热的转变正是对华北地台东部晚中生代两大构造体制转换的响应. 相似文献
15.
大别山北缘合肥盆地中,新生代构造演化 总被引：26，自引：3，他引：23
合肥盆地中、新生代经历了多次沉降和降升变化,侏罗系沉积作用分布于整个盆地,中、晚侏罗世盆地内地层遭受广泛剥蚀。白垩纪沉积物局限于盆地东部,最大剥蚀区在盆地东南部。下第三系沉积集中于断裂带控制的断陷盆地中,剥蚀主要在盆地东部和南部。根据南北向平衡剖面分析,早侏罗世盆地为南北挤压,晚侏罗世盆地拉张松驰形成东西向断层;白垩纪受东西向挤压,早第三纪为南北向拉张。东西向平衡剖面分析表明：在盆地内存在一条规模巨大的南北向巨型隆起,隆起形成干早白垩世早期延续到晚白垩世晚期。盆地经历了早侏罗世前挤压推覆,侏罗－白垩纪松驰下陷,白垩纪盆地西部及中部隆升,晚白垩世－早第三纪盆地受南北向拉张作用。形成北断南超的箕状断陷盆地;晚第三纪挤压降升。 相似文献
16.
华北—东北南部地区中生代中晚期粘土矿物与古气候 总被引：8，自引：0，他引：8
实验分析了华北－东北南部地区中侏罗统－白垩系泥质岩中粘土矿物的相对含量,说明了实验结果和作为古气候定性指针分析的可信度,总结了粘土矿物相对含量的时空变化及其古气候特征与演化,讨论了古气候变化与古地貌高地的关系。结果显示,伊利石既是各地也是各个层位最常见的粘土矿物,各区一般含量不少于20％,平均含量46.6％;其次是蒙脱石,在河南和山东的各个时期含量最低30％,平均达57.8％;高岭石和绿泥石只在山西较为丰富,其它各地相对少见;表明研究区中生代中晚期总体属于干冷气候环境,只在山西西部出现干冷－半湿热交替变化;证实古地貌高地“东部高原”的存在,但时空分布有所差异：时间上,它可始于中侏罗世并持续到白垩纪末期甚至古近纪;空间演化上分为两个阶段,早中侏罗世规模较小限于渤海湾之南,晚侏罗世—白垩纪扩大到东北南部和华北大部并呈南北向半弧形展布;认为东部高原对东北地区同期古气候没有影响,可能改变了冀北—辽西和豫西晚侏罗世和晚白垩世时期的古气候;指出东部高原物质可能在中侏罗世—早白垩世期间主要通过郯庐断裂南北两端已经消失了的入海口输送,白垩纪中期及之后则可能主要卸载到了周边盆地。 相似文献
17.
中国东南海域中生代地处欧亚板块东南缘, 夹持于欧亚板块、太平洋板块与印度澳大利亚板块之间。以往对于该区域的油气勘探多集中于新生代。笔者在前人研究的基础之上, 结合新近获得的地震资料, 开展了中国东南海域及周缘油气地质条件研究。结果表明:中国东南海域中生界分布广, 东海南部、台湾岛以及台西南盆地发育中生界深海相硅质岩, 可能与冲绳缝合带和菲律宾巴拉望缝合带形成有关;南海北部及周缘陆区发育上三叠统下侏罗统海相和海陆交互相碎屑岩及上侏罗统白垩系陆相碎屑岩, 可能与印支期缝合带的形成有关。从海域钻井及周缘陆区沉积层序资料推断, 中国东南海域有两套发育良好的烃源岩, 具有较强的生烃潜力:上三叠统下侏罗统海相泥页岩, 有机碳质量分数为0.28%~14.96%, 干酪根类型主要以Ⅱ2型和Ⅲ型为主;下白垩统海相泥页岩, 有机碳质量分数为0.60%~2.00%, 干酪根类型以偏Ⅱ2Ⅲ型为主。该海域发育两套生储盖组合:一套以上三叠统下侏罗统泥页岩为烃源岩, 中、上侏罗统砂岩为储层, 下白垩统泥页岩为盖层;另一套以下白垩统泥页岩为烃源岩, 白垩系砂岩为储层, 上白垩统泥页岩为盖层。它们相互可以形成"古生新储"、"自生自储"油气藏组合。因此, 中国东南海域中生界是值得关注的油气勘探新领域。 相似文献
18.
北山地区在前寒武纪变质岩及古生代浅变质岩、火山岩基底之上发育了一系列中——新生代沉积盆地,盆内沉积了厚度较大的侏罗——白垩系,发育侏罗系和下白垩统两套生储盖组合。侏罗系组合在中口子盆地、公婆泉盆地和扎格高脑盆地发育较好,是本区寻找侏罗系油气藏的有利地区。下白垩统组合在中口子盆地、公婆泉盆地、扎格高脑盆地和黑鹰山盆地发育较好,但埋藏浅,缺乏区域性盖层,其石油地质条件不如侏罗系组合。油气勘探实践表明,该区含油气远景取决于油气保存条件和区域盖层的发育情况。 相似文献
19.
川西前陆盆地中—新生代各构造层的残余厚度展布和沉积特征分析发现,四川克拉通周缘的前陆盆地在晚三叠世时期发育于龙门山山前,明显属于龙门山褶皱逆冲构造载荷所形成的前渊凹陷;侏罗纪早期的沉积地层呈面状分布,没有表现出显著的挠曲沉降,指示了一个构造相对平静的阶段;中侏罗世早期前渊凹陷迁移至龙门山北段和米仓山山前,前渊沉积从晚三叠世的北东向转换为近东西向,广泛的湖泊相沉积预示了前陆盆地的欠充填状态;中侏罗世中晚期,川西盆地沉降中心又迁移到大巴山山前,相应的挠曲变形又从近东西向转化为北西向,构成了大巴山的前渊凹陷;晚侏罗世—早白垩世时期,沉降中心再次回到米仓山山前,巨厚的前渊凹陷沉积指示了米仓山冲断带的主要活动时期;白垩纪末—古近纪的前渊凹陷则跃迁至雅安—名山地区。川西前陆盆地的同造山沉降中心以四川盆地中心为核心在西部和北部呈弧形迁移,沉积序列不断更替和叠加。中生界各构造层底界构造图显示现今的构造低部位位于川西北地区和川西南地区,在川西北地区均有东西走向的等值线分布,而川西南地区等值线走向则为北东-南西向。因此分析认为,晚侏罗世至早白垩世的构造变形可能控制了川西盆地现今的地层变形,形成了川西北地区的南北向构造挤压结构,而晚期的新生代构造变形则主要体现在川西盆地的西南部,形成北东-南西向的地层展布特征。 相似文献
20.
论福建坂头组的时代及对比 总被引：2，自引：0，他引：2
<正> 坂头组系陈恺(1943)命名,未指定建组剖面,以永安城北坂头村一带的岩性为标准。当时称坂头系,时代为早白垩世。坂头组分布在崇安、永安和泰宁举岚等盆地,宁化、安溪、仙游、古田和霞浦等地亦有零星出露。对坂头组的时代归属存在二种意见:福建省区调队(1976—1985)、原福建石油地质队(1978)、顾知微(1980、1982)、王思恩等(1985)归于 相似文献