中国东部中新生代盆地成因及其地球动力学   总被引：9，自引：1，他引：9  

孙加鹏  杨宝俊 《世界地质》1997,16(3):1-6

中国东部大兴安岭－太行山－武陵山重力梯度带一线以东至太平洋西岩，大陆连缘中新生代盆地系的形成，中生代岩浆活动，盆地基本特征同Ｍｏｈｏ、岩石圈和软流圈及上地幔基本特征的内在联系等都表明，它们在时空和成因上有一定联系，可以纳入同一地球动力学过程之中，这种动力学机制可能与岩石圈界，地壳底界的拆离作用有关。  相似文献   

Periodicity of magnetic intensities in magnetic anomaly profiles: the Cenozoic of the South Atlantic     

B. D'Argenio  M. Iorio  D. H. Tarling 《Geophysical Journal International》1996,127(1):141-155

Spectral analyses of several published magnetic anomaly profiles from Candé & Kent (1992a) were undertaken prior to analysing, in the same way, raw magnetic anomaly data from similar parts of the South Atlantic. It was found that similar and distinct medium and short wavelengths were present in both the published and raw data. When these are converted into the time domain using the average rate of spreading for each profile, these periodicities appear similar, possibly identical, to those expected from the long-term eccentricity orbital parameters (Fischer, DeBoer & Premoli Silva 1990). While such correlations are not necessarily causative, they suggest that magnetohydro-dynamical processes near the core-mantle boundary may be affected by gravitational changes due to planetary orbital perturbations.  相似文献   

柴达木盆地西部新生代气候与地形演变   总被引：24，自引：0，他引：24  

王建  刘泽纯 《地质论评》1996,42(2):166-173

从孢粉植物分异及演变，干旱碎屑及膏盐沉积分布等方面，对柴达木盆地西部新生代气候与地形的演变进行了探讨。结果表明，盆地西部新生代两个极端干燥气候期（膏盐发育期）分别出现在始新世至渐新世及上新世至第四纪。前者与老第三纪行星环流控制下的副热带干燥带有关，而后者与青藏高原的隆升有关。早第三纪盆地西部及周围地区的地势不象以前所认为的那么低平。在第三纪，昆仑山比祁连山低。晚新生代盆地向北推移了７－１１个纬距。  相似文献   

秦岭造山带新生代构造隆升与区域环境效应研究   总被引：16，自引：0，他引：16  

滕志宏  王晓红 《陕西地质》1996,(2)

据沉积，构造、地貌并结合地球物理资料综合研究认为，秦岭造山带新生代构造隆升是在中生代白垩纪晚期构造隆升基础上，于晚第三纪中新世迅速隆升，而早更新世早期则是新构造活动最强烈时期。秦岭造山带的新生代构造隆升的方式主要有地垒式、掀斜式、振荡式和翘板式4种。诱发这一地区新构造抬升的主要原因和动力学机制是华北地块自北而南，扬子地块自南而北相向向秦岭造山带之下陆内俯冲和秦岭地块深部软流圈抬升共同作用所致。  相似文献   

柴达木盆地新生代不同层次构造特征   总被引：8，自引：1，他引：8       下载免费PDF全文

郑孟林李明杰  曹春潮张军勇段书府  陈元中沈亚 管俊亚 《地质学报》2004,78(1):26-35

应用柴达木盆地地震、非地震资料进行综合解释研究发现,新生代盆地深、浅层构造存在较大差异,盆地沉积在不同时期受到不同构造格局的控制。古近系受近东西向构造控制,新近系受北西向构造控制,显示了柴达木盆地新生代为不同时期受不同方向构造控制的大型叠合盆地。盆地地层深、浅层构造变形特征不同,深层表现为陡倾的逆冲断裂构造,以断块构造为主要特征;中浅层表现为滑脱褶皱与滑脱断裂构造;地表在背斜核部发育斜列展布的正断层构造。盆地经历了多旋回沉积和多方式的后期改造,不同的构造组合形成了不同的储油气构造模式,认识这一点对于盆地深层的油气勘探,特别是寻找隐蔽油气藏具有重要意义。  相似文献   

~(40)Ar/~(39)Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance   总被引：6，自引：1，他引：6  

ZHANG Yueqiao  CHEN Wen  & YANG Nong . Institute of Geomechanics  Chinese Academy of Geological Sciences  Beijing  China  . Institute of Geology  Chinese Academy of Geological Sciences  Beijing  China  . Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China 《中国科学D辑(英文版)》2004,47(9)

TheNW-SEstrikingXianshuihefaultzoneslicesthesoutheasternTibetanPlateauandconnectssoutheastwardwiththeAnninghe-Zemuhe-Xiaojiangfaultzone,whichformahuge,activesinistralstrike-slipfaultzone(fig.1).ThisfaultzoneisanimportantseismicfaultineastTibet[1-5].EarthquakegeologystudiesandoffsetpatternsofyounggeologicalfeatureshaveshownthatlateQuaternarysinistralsliprateoftheXianshuihefaultzonereaches13mm/a[1,2].TheXianshuhefaultzoneconsistsoftwomainbranches,theDaofufaultbranchinthewestandtheXianshuih…  相似文献   

Preliminary Study on Cenozoic Group and Fault Activity in the Sea Area Near the Yangtze River Mouth   总被引：2，自引：0，他引：2  

Huo Enjie 《中国地震研究》2004,18(1):13-26

By shallow seismic prospecting, the Cenozoic Group in the sea area near the Yangtze Rver Mouth can be divided into five seismic sequences. They correspond to the Quaternary,Pliocene, Upper Miocene, Lower Miocene and Eocene respectively. The Quaternary System covers all the detecting area. The Tertiary System overlaps and thins out from NE to SW. The sedimentary basement mainly consists of volcanic rock (J3) and acidic rock (r35). Paleogene or Late Cretaceous basins are not found there. The faults that have been detected are all normal faults. They can be divided into three groups (NE, NW, near EW) by their trend. The NE and NW-trending faults are predominant, and agree with aeromagnetic anomaly. Their length and displacement are larger than that of the EW-trending faults. The activity of the NEtrending faults is different in different segments. The SW segment is a Quaternary fault, the middle segment is a Neogene fault, The NE is Paleogene. But the segment of the NW-trending fault is not obvious. The average vertical displacement rate is about 0.015mm/a.  相似文献   

滇西北新生代逆冲推覆构造   总被引：3，自引：0，他引：3  

沙绍礼  殷质豫  夏抱本 《云南地质》2004,23(2):154-163

滇西北地区新生代逆冲推覆构造较为发育，从西到东可分出走向NS、相互平行的4带：澜沧江带，云岭带，石钟山带和剑川-洱源带。其中，澜沧江带与云岭带组成对冲格局，云岭带又与石钟山带组成反冲格局，石钟山带与剑川-洱源带又组成对冲格局。参与逆冲推覆的地层主要是中生代三叠系、侏罗系、白垩系及新生代云龙组、宝相寺组，推覆体由石炭系、二叠系、上三叠统岩石组成。逆冲推覆时间为喜马拉雅期。  相似文献   

中国东部中新生代构造格局和岩浆岩带的形成与演化   总被引：7，自引：0，他引：7  

汤加富  高天山  李怀坤 《华北地质》2004,27(2):65-74

在研究印支期秦岭-大别-苏鲁造山带的形成与地幔差速环流的基础上，系统综合了中国东部中新生代的基底构造对断裂构造的控制，深层构造对隆凹与断陷盆地的制约，伸展构造在陆内及陆缘外的表现，岩浆岩带的时空分布及展布特点等规律，依据中国东部中新生代构造格局与岩浆岩带在时空分布上的宽阔性、方向性、迁移性、分带性，特别是深层构造对浅层断裂构造、伸展构造的制约，以及岩浆岩带、隆起与盆地等自西向东迁移特点，提出其形成机制可能与强大地幔东向差速环流有关。  相似文献   

(40)~Ar/(39)~Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin, Tibet   总被引：9，自引：0，他引：9  

ZHANG Huihua  HE Huaiyu  WANG Jianghai & XIE Guanghong Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  China  Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China  College of Life Sciences  Sun Yat-Sen University  Guangzhou  China 《中国科学D辑(英文版)》2005,48(1)

Our two newly obtained high-quality 40Ar/39Ar ages suggest that the high-K volcanic rocks of the Lawuxiang Formation in the Mangkang basin, Tibet were formed at 33.5±0.2 Ma. The tracing of elemental and Pb-Sr-Nd isotopic geochemistry indicates that they were derived from an EM2 enriched mantle in continental subduction caused by transpression. Their evidently negative anomalies in HFSEs such as Nb and Ta make clear that there is an input of continental material into the mantle source. The high-K rocks at 33.5±0.2 Ma in the Mangkang basin may temporally, spatially and compositionally compare with the early one of two-pulse high-K rocks in eastern Tibet distinguished by Wang J. H. et al., implying that they were formed in the same tectonic setting.  相似文献