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1.
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
2.
Tianyi Shen Yue Chen Guocan Wang Junliang Ji Yong Wang Pan Zhang Paul Sotiriou Rong Guo Zezhuang Xu 《地学学报》2020,32(2):166-178
Analysing the provenance changes of synorogenic sediments in the Turpan‐Hami basin by detrital zircon geochronology is an efficient tool to examine the uplift and erosion history of the easternmost Tian Shan. We present detrital zircon U‐Pb analysis from nine samples that were collected within marginal lacustrine Middle‐Late Jurassic and aeolian‐fluvial Early Cretaceous strata in the basin. Middle‐Early Jurassic (159–172 Ma) zircons deriving from the southern Junggar dominated the Middle Jurassic sample from the western Turpan‐Hami basin, whereas Permian‐Carboniferous (270–330 Ma) zircons from the Bogda mountains were dominant in the Late Jurassic to Early Cretaceous samples. Devonian‐Silurian (400–420 Ma) and Triassic (235–259 Ma) zircons from the Jueluotage and Harlik mountains constituted the subordinate age groups in the Late Jurassic and Early Cretaceous samples from the eastern basin respectively. These provenance transitions provide evidence for uplift of the Bogda mountains in the Late Jurassic and the Harlik mountains since the Early Cretaceous. 相似文献
3.
郯庐断裂带北延及中新生代构造体制转换问题的探讨 总被引：23，自引：0，他引：23
郯庐断裂带北段在进入东北地区后主要分为走向北东—北北东的三支断裂,由西向东依次为沈阳—长春—哈尔滨断裂、依兰—伊通断裂和敦化—密山断裂。由于不同时期的大地构造背景和地球动力学的不同,它们在中、新生代的构造体制转换主要表现有如下5个阶段:(1)早、中侏罗世直到早白垩世时以拉张为主,形成一系列断陷盆地或坳陷盆地,并伴有中-酸性岩浆侵入和喷发,形成了独特的火山-湖相沉积盆地;(2)早白垩世末,为北西—南东向的压缩构造应力场,使盆地内的中、上侏罗统地层发生走向近北东的逆冲推覆构造;(3)晚白垩世,为北东向左行剪切构造应力场,区内侏罗系和早白垩世早期的沉积物发生褶皱,与上覆地层呈明显的不整合;(4)古近纪时为北西—南东向拉张构造应力场,日本海从古近纪开始逐渐拉开,直到新近纪完成现在的格局;(5)新近纪时又转换为挤压构造应力场,以北西—南东向挤压为主,使古近系沉积物发生轻微的褶皱。 相似文献
4.
江西修水第四系网纹红土的地层学研究 总被引：32，自引：1，他引：32
根据大量野外观察和室内分析结果，较详细论述了江西修水地区第四系网纹红土的地貌地层、岩石地层、磁性地层和年代地层等方面的特征，并在此基础上，就有关网纹红土的形成时代、成因以及与黄土的对比等问题进行了讨论，提出１）网纹红土可分为强网纹化红土和弱网纹化红土两个岩性段，每个岩性段又由若干个密集网纹层与稀疏网纹层构成；网纹红土与下伏红色砾石层属同期产物；２）网纹红土中的密集网纹层的地质意义相当于北方黄土中的古土壤；３）网纹红土形成于早更新世末（约０．９ＭａＢ．Ｐ．）至晚更新世初（约０．１ＭａＢ．Ｐ．）；４）网纹红土发育于湿热气候条件下，地下水埋深浅，地表低洼、排水不畅的环境。 相似文献
5.
从原始塔里木板块的演化入手,结合构造单元的划分,将巴丹吉林地区中生代地层划分为塔里木地层区的北山地层分区、阿拉善地层分区（包括北缘小区和南缘小区）和河西走廊地层分区,基本理顺了各分区（小区）中生代地层的命名系统,为研究各分区的沉积 构造古地理演化和恢复中生代原形盆地奠定了基础 相似文献
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7.
The closure of the western part of the Neotethys Ocean started in late Early Jurassic. The Middle to early Late Jurassic contraction
is documented in the Berchtesgaden Alps by the migration of trench-like basins formed in front of a propagating thrust belt.
Due to ophiolite obduction these basins propagated from the outer shelf area (=Hallstatt realm) to the interior continent
(=Hauptdolomit/Dachstein platform realm). The basins were separated by nappe fronts forming structural highs. This scenario
mirrors syn-orogenic erosion and deposition in an evolving thrust belt. Active basin formation and nappe thrusting ended around
the Oxfordian/Kimmeridgian boundary, followed by the onset of carbonate platforms on structural highs. Starved basins remained
between the platforms. Rapid deepening around the Early/Late Tithonian boundary was induced by extension due to mountain uplift
and resulted in the reconfiguration of the platforms and basins. Erosion of the uplifted nappe stack including obducted ophiolites
resulted in increased sediment supply into the basins and final drowning and demise of the platforms in the Berriasian. The
remaining Early Cretaceous foreland basins were filled up by sediments including siliciclastics. The described Jurassic to
Early Cretaceous history of the Northern Calcareous Alps accords with the history of the Western Carpathians, the Dinarides,
and the Albanides, where (1) age dating of the metamorphic soles prove late Early to Middle Jurassic inneroceanic thrusting
followed by late Middle to early Late Jurassic ophiolite obduction, (2) Kimmeridgian to Tithonian shallow-water platforms
formed on top of the obducted ophiolites, and (3) latest Jurassic to Early Cretaceous sediments show postorogenic character. 相似文献
8.
山东鲁西地块断裂构造分布型式与中生代沉积—岩浆—构造演化序列 总被引：7，自引：0，他引：7
鲁西地块的断裂构造有两类不同分布型式:一类呈放射状分布, 由陡倾、基底右行韧性剪切带和盖层内复杂力学性质的断裂组成; 另一类呈环绕地块基底核部同心环状分布, 由3个主要盖层伸展拆离带组成, 主滑脱面分别位于古生界盖层与基底间的不整合面、石炭系与奥陶系之间的平行不整合面和中新生代断陷-沉积岩系与新生代火山-沉积物之间的断层。中生代构造变形样式可以分为3个层次:印支期褶皱-逆冲推覆构造、燕山中期NNE轴向的隔槽式箱状褶皱和燕山晚期NW、NNE向共轭正断-走滑断裂。相应地鲁西地块经历了3个成盆期, 即早-中侏罗世、早白垩世和晚白垩世, 这些中生代盆地在空间上的叠置导致了地块内部复杂的盆-山耦合关系。鲁西地块中生代有两个岩浆活动集中时期, 即早侏罗世(约190Ma)和早白垩世(132~110Ma)。综合沉积记录、岩浆活动和构造变形过程, 将鲁西地块中生代构造演化历史划分为6个阶段:晚三叠世挤压变形, 早、中侏罗世弱伸展作用, 中、晚侏罗世挤压变形与地壳增厚作用, 早白垩世大陆裂谷与地壳伸展作用, 早白垩世末期挤压变形与盆地反转事件和晚白垩世区域隆升。这些构造演化阶段和构造事件对研究和理解中生代构造体制和深部岩石圈动力学转换过程具有重要意义。 相似文献
9.
运用流体包裹体确定鄂尔多斯盆地上古生界油气成藏期次和时期 总被引：25，自引：7，他引：18
对鄂尔多斯盆地上古生界68口井110块流体包裹体样品的荧光观察,60口井75块样品的显微测温、测盐等系统分析结果表明,该区上古生界砂岩储层发生过6期热流体活动,均与油气成藏有关,并以第2～6期的天然气成藏为主.结合埋藏史分析可知,油气成藏分别发生在距今220～190 Ma(T3中期-J1中期)、190～150 Ma(J1中期-J2中期)、150～130 Ma(J2中期-J2末期)、130～113 Ma(J2末期-K1中早期)、113～98 Ma(K1中早期-K1中晚期)、98～72 Ma(K1中晚期-K1末期),并认为早侏罗世中期-中侏罗世末期、中侏罗世末期-早白垩世末期是鄂尔多斯盆地上古生界天然气的主要成藏时期. 相似文献
10.
北羌塘盆地晚中生代地层:早白垩世海相地层的发现 总被引：5，自引：0，他引：5
针对羌塘盆地是否存在早白垩世海相沉积,以那底岗日地区主干剖面为依托,结合胜利河、托纳木、长蛇山等已初步判断为早白垩世的油页岩剖面为辅助剖面,采用古生物化石定年和同位素定年相结合的研究方法,对胜利河-托纳木地区原初步定为晚侏罗世-早白垩世的海相地层时代作了进一步研究,结果表明,其时代为早白垩世。这些海相地层在胜利河-托纳木地区广泛分布,但岩性组合存在一定的差异,在胜利河-长蛇山地区为油页岩,厚度最大,向东逐渐变薄,过渡为页岩沉积,向西过渡为灰岩沉积。区域上该套地层对下伏油气藏的保存具有重要意义。 相似文献
11.
鲁西南地区分布着近东西向大致平行排列的早第三纪盆地群。在蒙阴、莱芜盆地早第三纪沉积称为官庄组，在平邑盆地称为卞桥组。依据沉积物特征和沉积旋回都能分为下段、中段和上段。通过对哺乳动物、介形类、轮藻、腹足类和孢粉等化石的研究可确定中段的沉积时代为早始新世，通过对轮藻、介形类和哺乳类动物的研究能确定下段和上段分别为始新世早期和中期。在卞桥组中段和官庄组中段发现介形类Ｃｙｐｒｉｄｅａ属，该属起源于晚侏罗世或早白垩世，在早白垩世繁盛，晚白垩世逐渐衰落，灭绝于晚古新世或早始新世，在早始新世沉积中的发现，是迄今在我国发现的最高层位。 相似文献
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13.
黑龙江省东部中侏罗世至早白垩世沟鞭藻组合序列 总被引：5，自引：0，他引：5
对近二十年来黑龙江省东部海相侏罗纪—白垩纪沟鞭藻地层资料进行了综合研究 ,首次为该地区建立起侏罗纪—白垩纪沟鞭藻地层序列 ,主要包含 7个组合带 (含 3个高峰带 ) ,其中绥滨地区 Callovian— Valanginian期有 4个带 ;鸡西盆地早白垩世也有 4个带 (其中包括与绥滨地区早白垩世早期同时异相的一个 )。它们自下而上为 :1)绥滨组的 Pareodinia ceratophora- N annoceratopsispellucida组合带 ; 2 )东荣组下部的 Gonyaulacysta jurassica组合带 (高峰带 ) ; 3)东荣组上部的 Amphorula delicata组合带 ; 4 )东荣组最上部的海相 Oligosphaeridium pul-cherrimum组合带 (高峰带 )或鸡西盆地滴道组的微咸水—半咸水的 Vesperopsis didaoensis- L agenorhytis granoru-gosa组合带 ,两者为同时异相关系 ; 5 )城子河组下部海相层的 Odontochitina operculata- Muderongia tetracantha组合带 (该带可进一步划分出 2个亚组合带 ) ; 6 )城子河组上部海相层的 Canningia reticulata组合带 ; 7)穆棱组下段的 Cribroperidinium ?parorthoceras组合带 (高峰带 )。 相似文献
14.
《International Geology Review》2012,54(11):1417-1442
ABSTRACTThe Ordos Basin, situated in the western part of the North China Craton, preserves the 150-million-year history of North China Craton disruption. Those sedimentary sources from Late Triassic to early Middle Jurassic are controlled by the southern Qinling orogenic belt and northern Yinshan orogenic belt. The Middle and Late Jurassic deposits are received from south, north, east, and west of the Ordos Basin. The Cretaceous deposits are composed of aeolian deposits, probably derived from the plateau to the east. The Ordos Basin records four stages of volcanism in the Mesozoic–Late Triassic (230–220 Ma), Early Jurassic (176 Ma), Middle Jurassic (161 Ma), and Early Cretaceous (132 Ma). Late Triassic and Early Jurassic tuff develop in the southern part of the Ordos Basin, Middle Jurassic in the northeastern part, while Early Cretaceous volcanic rocks have a banding distribution along the eastern part. Mesozoic tectonic evolution can be divided into five stages according to sedimentary and volcanic records: Late Triassic extension in a N–S direction (230–220 Ma), Late Triassic compression in a N–S direction (220–210 Ma), Late Triassic–Early Jurassic–Middle Jurassic extension in a N–S direction (210–168 Ma), Late Jurassic–Early Cretaceous compression in both N–S and E–W directions (168–136 Ma), and Early Cretaceous extension in a NE–SW direction (136–132 Ma). 相似文献
15.
《International Geology Review》2012,54(9):1072-1096
In this paper, we summarize results of studies on ophiolitic mélanges of the Bangong–Nujiang suture zone (BNSZ) and the Shiquanhe–Yongzhu–Jiali ophiolitic mélange belt (SYJMB) in central Tibet, and use these insights to constrain the nature and evolution of the Neo-Tethys oceanic basin in this region. The BNSZ is characterized by late Permian–Early Cretaceous ophiolitic fragments associated with thick sequences of Middle Triassic–Middle Jurassic flysch sediments. The BNSZ peridotites are similar to residual mantle related to mid-ocean-ridge basalts (MORBs) where the mantle was subsequently modified by interactions with the melt. The mafic rocks exhibit the mixing of various components, and the end-members range from MORB-types to island-arc tholeiites and ocean island basalts. The BNSZ ophiolites probably represent the main oceanic basin of the Neo-Tethys in central Tibet. The SYJMB ophiolitic sequences date from the Late Triassic to the Early Cretaceous, and they are dismembered and in fault contact with pre-Ordovician, Permian, and Jurassic–Early Cretaceous blocks. Geochemical and stratigraphic data are consistent with an origin in a short-lived intra-oceanic back-arc basin. The Neo-Tethys Ocean in central Tibet opened in the late Permian and widened during the Triassic. Southwards subduction started in the Late Triassic in the east and propagated westwards during the Jurassic. A short-lived back-arc basin developed in the middle and western parts of the oceanic basin from the Middle Jurassic to the Early Cretaceous. After the late Early Jurassic, the middle and western parts of the oceanic basin were subducted beneath the Southern Qiangtang terrane, separating the Nierong microcontinent from the Southern Qiangtang terrane. The closing of the Neo-Tethys Basin began in the east during the Early Jurassic and ended in the west during the early Late Cretaceous. 相似文献
16.
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
17.
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
18.
鄂西利川地区位于湘鄂西构造带与川东构造带的过渡部位,叠加褶皱发育,地处两大构造带分界处的齐岳山高陡背斜带断裂发育。本文以利川地区褶皱和断裂为研究对象,在野外观测和分析的基础上,采用断层滑动数据反演方法,对构造应力场进行了恢复;结合区域构造演化历史,提出该区侏罗纪以来经历了五期构造应力作用,从早到晚分别为:北西-南东向挤压(J3-K1)、近东西向挤压(K1)、近南北向挤压(K1-K2)、北西-南东向引张(K2)和北东-南西向挤压(E3)。该区侏罗纪以来构造变形序列的建立,为深入认识齐岳山高陡背斜带地质灾害形成的地质背景提供了构造地质学证据。 相似文献
19.
大兴安岭─燕山地层分区中、新生代地层 总被引：1，自引：0，他引：1
对大兴安岭和燕山北部的中生代地层，进行了系统的总结。侏罗纪早中期为含煤地层，晚期为以兴安岭群为代表的火山堆积；白垩纪早期为火山－沉积含煤地层，晚期为红层。第三纪以二连盆地合大量哺乳动物群的杂色沉积为特征。 相似文献
20.
The Rajmahal Traps were discovered in the Panagarh area, West Bengal, during the exploration for coal resources. A Gondwana succession was found beneath the traps, consisting of the Early Cretaceous Intratrappean Rajmahal Formation, the Early Triassic Panchet Formation and the Late Permian coal-bearing Raniganj Formation. The present palynological study was aimed at confirming the age of the Panchet Formation. As a result of this study it has been found that Jurassic sediments are also included in the Panchet Formation. The study has revealed that the Panchet Formation, defined on a lithological basis, is a time-transgressive unit extending from the Early Triassic to the Late Jurassic, with a phase of non-deposition between the Middle Triassic and Middle Jurassic. 相似文献