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1.
The Tainan Basin is one of the set of Cenozoic extensional basins along northern margin of the South China Sea that experienced extension and subsequently thermal subsidence. The Tainan Basin is close to the Taiwan Arc-Trench System and straddles a transition zone between oceanic and continental crust. A new regional multi-channel seismic profile （973-01） across the region of NE South China Sea is introduced in this paper. In seismic stratigraphy and structural geology, a model of Cenozoic tectono-sedimentation of the Tainan Basin is established. The results show that three stages can be suggested in Tainan Basin; In Stage A （Oligocene （？）-Lower Miocene） the stratigraphy shows restricted rifting, indicating crustal extension. Terrestrial sedi- ments mostly filled the faulted sags of the North Depression on the continental shelf. Structural highs, including the Central Uplift, blocked material transportation to the South Depression in abyssal basin. In Stage B the Tainan Basin （Middle-Upper Miocene） exhibits a broad subsidence resulting from the post-rifting thermal cooling. The faulted-sags in North Depression had been filled up. Terrestrial materials were transported over the structural highs and deposited directly in the South Depression through sub- marine gullies or canyons. This sedimentation resulted in a crucial change in the slope to a modem shape. In Stage C （Latest Miocene-Recent） a phase change from extension to compression took place due to the orogeny caused by the overthrusting of the Luzon volcanic arc. Many inverse structures, such as thrusts, fault bend folds, and a regional unconformity were formed. Forland basin began developing.  相似文献   

2.
We studied the geochemical characteristics of the fluid inclusions in the Ordovician carbonates and the Oligocene Shahejie Formation sandstones from 15 wells in the Gangxi Fault Belt, Huanghua Depression. The fluid inclusions are all sec- ondary with gas/liquid ratio of 5%~10%. Base on Raman they are mainly composed of H2O, CO2 and CH4. The homogenization temperatures, combined with burial and geothermal history of the host rock, indicate that the fluid flows in the Shahejie Formation and the Ordovician carbonates were trapped in Neocene. Using a VG5400 mass spectrometer, the helium isotopic compositions were analyzed. Interpretation of results suggested a significant amount of mantle-derived helium mainly accumulating in the intersections of the NWW trending Xuzhuangzi and NE trending Gangxi faults. The maturity of hydrocarbon decreases from the intersection to the outside pointing out that the fluid related to the NWW trending Xuzhuangzi and NE trending Gangxi faults. These factors implied the fluid inclusions have a close relationship to the local tectonic setting. Gangxi Fault Belt experienced intensive Neo-tectonic activities in Cenozoic. Widespread faulted-depressions and strong volcanic eruptions manifested its tec- tonic status of extensional stress field. Mantle uplift caused the movement of magma that carried mantle-derived gases and deep heat flows, the deep-rooted tension faults provided the passages for the gases and heat flows to shallow crust levels.  相似文献   

3.
ＩＮＴＲＯＤＵＣＴＩＯＮＫｕｎｌｕｎＳｈａｎｌｏｃａｔｅｄａｔｔｈｅｊｕｎｃｔｕｒｅｏｆＥｕｒ ａｓｉａａｎｄＧｏｎｄｗａｎａｉｓａｖｅｒｙｉｍｐｏｒｔａｎｔｓｕｂｊｅｃｔｉｎｇｅｏｌｏｇｉｃａｌｒｅｓｅａｒｃｈ (Ｆｉｇ. 1 ) .ＭａｎｙｇｅｏｌｏｇｉｓｔｓｃｏｎｄｕｃｔｅｄｒｅｓｅａｒｃｈｅｓｉｎＷｅｓｔｅｒｎＫｕｎｌｕｎＳｈａｎ(Ｐａｎｅｔａｌ.,1 990 ,1 992 ,1 995,1 996;ＹａｏａｎｄＨｓｕ ,1 994 ;Ｌｉｅｔａｌ.,1 996;Ｄｉｎｇｅｔａｌ.,1 996;Ｍａｔｔｅｅｔａｌ.,1 996) .Ｔｒｉａｓｓｉｃｓｔｒａｔａ…  相似文献   

4.
The authors’ analysis of the chemical components and sedimentary characteristics of the well developed Triassic strata in the southeastern part of western Kunlun Shan led them to conclude that the sediments comprise a set of typical deep-water to semi-deep-water flysch that formed in the passive continental margin of the Qiangtang Block. This suit of strata had undergone strong deformation giving rise to a SW-thrusting duplex, imbricate fans, high-angle thrust fault, recumbent fold, SW-inverted fold, etc.. The deformational intensity weakens gradually southeastward. This is a foreland fold and thrust belt caused by the collision between the Qiangtang Block and the island are on the southern margin of the the Tarim Plate at the end of late Triassic. The sedimentary and deformational characteristics of the Triassic strata were used to reconstruct the evolution of this foreland fold and thrust belt as proposed below. Before the end of Triassic, this region was a passive continental margin in the north of the Qiangtang Block. The end of Triassic to Jurassic was a stage of thrusting, folding, uplifting and development of the foreland basin. The evolution of the fold and thrust was completed in Cretaceous. Project supported by NSFC (49872073) and Key Project of NSFC.  相似文献   

5.
This paper deals with the internal force and the deformation matrixes, both of which can be used to analyze the topological relationship of a structure. Based on the reciprocal theorem, the relationship between the two matrixes is established, which greatly simplifies the computation of the internal force matrix. According to the characteristics of the internal force matrix, the transfer law of the matrix itself（due to the removal of components） is established based on the principle of linear superposition. With the relation of the two matrixes, the transfer law of the deformation matrix is also obtained. The transfer law illuminates the change regularity of internal force or deformation of the remnant structure when certain members are cut offone after another. The results of numerical examples show that the proposed methods are correct, reliable and effective.  相似文献   

6.
天山是清代西域诗歌中的重要组成部分,它是熔铸了西域诗人主观感情的客观物象。天山的高峻、险要既带给诗人强烈的震撼,也是诗人命运坎坷的象征;诗人描写天山时蕴含了浓郁的思乡之情、深重的历史沧桑感,诗中既表达了其对天山的喜爱之情,有时也流露出至西域的愁苦之情。因此,要完全理解这些西域诗歌的深刻内涵,就必然要结合天山这一特殊的意象来解读清代西域诗歌。  相似文献   

7.
雷琼新生代断陷盆地构造特征及其演化   总被引：3，自引：0，他引：3  
雷琼新生代断陷盆地构造主要受走向北东东、北西和北东3组断裂控制,新生代不同时期各组断裂活动程度不同。在编制新生代不同阶段的地层等厚度图的基础上,讨论了雷琼断陷盆地及其内部次级构造在时空上的迁移、发展和转化特征;根据地层厚度反演,估算了盆地的下降幅度和不同阶段的下降速率、拉张因子以及拉张量。盆地的构造演化可分为5个阶段,且与南海扩张、深部物质运动以及印澳板块、菲律宾海板块的相互作用在成因上有密切联系。  相似文献   

8.
通过对任楼煤矿地质勘探及生产时期揭露的资料,分析了矿井地质构造特征及演化过程,得出矿井主体褶皱为向东倾斜的单斜构造,断层构造较发育,且正断层所占的比例较大,断层走向以NE、NEE和NNW为主,断层倾角较大,由于多期运动的叠加,构造更加趋向于复杂化,对煤矿的安全生产有着重大的影响。  相似文献   

9.
丝绸之路古代佛寺遗址很多,其中有昆仑山北麓的佛寺壁画,天山以南的佛寺壁画内容极为丰富,构图丰满而不繁琐,线描挺拔而不生硬,色调浑厚富丽而又不乏爽朗明快之感。这些壁画用线造型,以形写神,赋彩说情,技法高超,充分表现了虚幻的宗教境界和佛教艺术美学的意境。  相似文献   

10.
吴波 《毕节学院学报》2012,30(4):118-124
贵州纳雍水东铅锌矿床位于扬子地台西缘,是黔西北铅锌矿区的重要组成部分。区内铅锌矿具有构造控矿的明显特征,矿体主要产于上震旦统灯影组地层主次断裂交汇处或断层破碎带中。铅锌矿源层初步形成于晚震旦世,基底的铅锌物质和海侵带来的陆源物质被藻类吸附与硫离子团结合形成金属硫化物矿源层。包裹体研究表明,矿源层形成后,至少经历了大规模成矿作用和后期叠加改造两期成矿作用,并划分出成矿物质的初步富集、大规模铅锌矿富集成矿和后期构造运动对铅锌矿形态的改造三个成矿阶段,对应于矿源层形成和两期成矿作用。通过与典型MVT型、SEDEX型铅锌矿床地质地球化学特征对比,认为纳雍水东铅锌矿床类型属于典型的MVT型铅锌矿床,并提出了找矿标志和建议。  相似文献   

11.
本文首先说明《山海经》所载神话应属于西域昆仑神话范围,进而梳理屈原诗歌所采用的《山海经》神话素材,以此说明西域古代文化——昆仑神话对屈原诗歌的影响。同时也说明了西域文化在战国中后期,已经深入影响了中原文化。  相似文献   

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