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1.
琼东南盆地深水区中央峡谷黄流组物源特征 总被引：3，自引：2，他引：1
物源分析作为岩相-古地理研究的前提和基础,物源体系决定了砂体的展布和储集性能。为明确中央峡谷体系黄流组储集体展布规律及下一步勘探方向,本文应用中央峡谷最新钻井资料,采用重矿物组合、锆石U-Pb测年等分析方法,结合地震反射特征,对中央峡谷黄流组物源体系特征进行分析。地震反射特征表明来自海南隆起和昆嵩隆起物源的三角洲体系,通过二次搬运沉积了陆架斜坡区和盆底的低位海底扇,为中央峡谷的沉积充填提供了充足的粗碎屑沉积物;新钻井黄流组样品中重矿物组合以白钛矿、石榴石、磁铁矿含量较高为主要特征,与莺歌海盆地受蓝江物源影响和琼东南盆地受丽水-秋滨河物源影响的地层重矿物组合相似;锆石U-Pb测年分析表明,中央峡谷黄流组地层中样品年龄图谱具有30~2 000Ma变化范围,与莺歌海盆地受昆嵩隆起物源影响的钻井以及越南现代河流采集的沙样具有非常一致的年龄段和丰度。综上所述,中央峡谷受多物源的影响,越南昆嵩隆起为主的琼东南盆地西部物源体系,是琼东南盆地乐东凹陷晚中新世深水扇以及中央峡谷粗碎屑物质的主要沉积物供给来源区。 相似文献
2.
3.
宋维宇 《海洋地质与第四纪地质》2012,(2):77-83
莺歌海盆地位于印支半岛与南海北部大陆边缘交接区,复杂的地质构造背景使其形成演化的动力学机制成为国内外研究的焦点。综合新的区域资料,对影响莺歌海盆地发育的区域构造演化特征进行了系统分析,认为新生代以来印度板块与欧亚板块的碰撞造成印支板块的逃逸构造,以及印支板块的顺时针旋转,红河断裂带新生代的变形机制,直接或间接地控制了莺歌海盆地的形成与演化。在此背景条件下,莺歌海盆地新生代以来的构造演化经历了3个阶段,即左旋走滑-伸展裂陷阶段、地壳韧性伸展-热沉降阶段和加速沉降阶段。 相似文献
4.
Studies in the northern South China Sea(SCS) basement remain important for understanding the evolution of the Southeast Asian continental margin. Due to a thick cover of sediments and scarce borehole penetration, little is known about the age and tectonic affinity of this basement. In this study, an integrated study of zircon U-Pb geochronology, Hf isotopes, and whole-rock major and trace elements on seven basement granitoids from seven boreholes of Qiongdongnan Basin has been carried out. New z... 相似文献
5.
Geochemical and detrital zircon U-Pb dating data for drilled sediments from the Baiyun deepwater area of the northern South China Sea demonstrate a change of sedimentary sources from the Oligocene to the Miocene.Zircon ages of the pre-rift Eocene sequences are dominated by Yanshanian ages with various peak values(110–115 Ma for U1435 and L21; 150 Ma for H1), indicating local sediment supply from the pre-existing Mesozoic magmatic belt. For the Oligocene sediments in the northern part of the basin, the rare earth elements show different distribution characteristics, indicating sediment supply from the paleo-Zhujiang River(Pearl River), as also confirmed by the multimodal zircon age spectra of the Lower Oligocene strata in Well X28. By contrast, a positive Eu anomaly characterizes sediments from the western and southern parts of the basin, indicating potential provenances from intermediate to basic volcanic rock materials. The Baiyun Movement at the end of the Oligocene contributed to a large-scale subsidence in the deepwater area and also a northward retreat of continental shelf break, leading to deepening depositional environment in the basin. As a result, all the detrital zircon ages of the Upper Oligocene strata from Wells X28, L13, and L21 share a similar distribution, implying the possible control of a common source like the Zhujiang River. During the Miocene, whereas sediments in the northern area were mainly sourced from the Zhujiang River Delta, and those in the southern deepwater area continued to be affected by basic volcanic activities, the Dongsha Uplift could have contributed as the main source to the eastern area. 相似文献
6.
Early Cenozoic paleontological assemblages and provenance evolution of the Lishui Sag,East China Sea
Yingzhao Zhang Yiming Jiang Zhenghua Liu Shuai Li Ning Li Jinshui Liu Peijun Qiao Kai Zhong Shuhui Chen Thian Lai Goh 《海洋学报(英文版)》2023,42(3):113-122
The East China Sea Shelf Basin generated a series of back-arc basins with thick successions of marine- and terrestrial-facies sediments during Cenozoic. It is enriched with abundant oil and gas resources and is of great significance to the petroleum exploration undertakings. Therein, the Lishui Sag formed fan delta, fluvial delta and littoral-to-neritic facies sediments during Paleocene–Eocene, and the research on its sedimentary environment and sediment source was controversial. This study analyzed the paleontological combination characteristics, and conducted a source-to-sink comparative analysis to restore the sedimentary environment and provenance evolution of the Lishui Sag during Paleocene–Eocene based on the integration of detrital zircon U-Pb age spectra patterns with paleontological assemblages. The results indicated that Lishui Sag was dominated by littoral and neritic-facies environment during time corroborated by large abundance of foraminifera, calcareous nannofossils and dinoflagellates. Chronological analysis of detrital zircon U-Pb revealed that there were significant differences in sediment sources between the east and west area of the Lishui Sag. The western area was featured by deeper water depths in the Paleocene–Eocene, and the sediment was characterized by a single Yanshanian peak of zircon U-Pb age spectra, and mainly influenced from Yanshanian magmatic rocks of South China Coast and the surrounding paleo-uplifts. However, its eastern area partly showed Indosinian populations. In particular, the upper Eocene Wenzhou sediments were featured by increasingly plentiful Precambrian zircons in addition to the large Indosinian-Yanshanian peaks, indicating a possible impact from the Yushan Low Uplift to the east. Therefore, it is likely that the eastern Lishui Sag generated large river systems as well as deltas during time. Due to the Yuquan Movement, the Lishui Sag experienced uplifting and exhumation in the late stage of the late Eocene and was not deposited with sediments until Miocene. Featured by transitional-facies depositions of Paleocene–Eocene, the Lishui Sag thus beared significant potential for source rock and oil-gas reservoir accumulation. 相似文献
7.
There are many large-scale Cenozoic sedimentary basins with plentiful river deltas, deep-water fans and carbonate platforms in the southern South China Sea. The Crocker Fan was deposited as a typical submarine fan during the late Eocene–early Miocene, and stretches extensively across the entire Sarawak–Sabah of the northern Borneo area. However, systematic analyses are still lacking regarding its sediment composition and potential source suppliers. No consensus has been reached yet on the provenance evolution and sedimentary infilling processes, which seriously impeded the oil-and-gas exploration undertakings. By combining with sedimentary-facies identification, heavy mineral assemblages, elemental geochemistry and detrital zircon U-Pb dating, this paper aims to generalize an integrated analysis on the potential provenance terranes and restore source-to-sink pathways of the Crocker Fan. In general, the Crocker Fan was initially formed over the Cretaceous–lower/middle Eocene Rajang Group by an angular Rajang unconformity. The continual southward subduction of the proto-South China Sea resulted in magmatic activities and subsequent regional deformation and thrusting along the Lupar Line in the northern Borneo. The lowermost Crocker sequence is featured by a thick conglomerate layer sourced from in-situ or adjacent paleo-uplifts. From the late Eocene to the early Miocene, the Crocker Fan was constantly delivered with voluminous detritus from the Malay Peninsula of the western Sundaland. The Zengmu Basin was widely deposited with delta plain and neritic facies sediments, while the Brunei-Sabah Basin, to the farther east, was ubiquitously characterized by turbiditic sequences. The Crocker Fan successions are overall thick layers of modest-grained sandstones, which formed high-quality reservoirs in the southern South China Sea region. 相似文献
8.
Structures of the northeasternmost South China Sea continental margin and ocean basin: geophysical constraints and tectonic implications 总被引：2，自引：0，他引：2
Chun-Feng Li Zuyi Zhou Jiabiao Li Hujun Hao Jianhua Geng 《Marine Geophysical Researches》2007,28(1):59-79
The northeastern part of the South China Sea is a special region in many aspects of its tectonics. Both recent drilling into
the Mesozoic and new reflection seismic surveys in the area provide a huge amount of data, fostering new understanding of
the continental margin basins and regional tectonic evolution. At least four half-grabens are developed within the Northern
Depression of the Tainan Basin, and all are bounded on their southern edges by northwestward-dipping faults. One of the largest
half-grabens is located immediately to the north of the Central Uplift and shows episodic uplift from the late Oligocene to
late Miocene. Also during that period, the Central Uplift served in part as a material source to the Southern Depression of
the Tainan Basin. The Southern Depression of the Tainan Basin is a trough structure with deep basement (up to 9 km below sealevel
or 6 km beneath the sea bottom) and thick Cenozoic sedimentation (>6 km thick). Beneath the Southern Depression we identified
a strong landward dipping reflector within the crustal layer that represents a significant crustal fault. This reflector coincides
with a sharp boundary in crustal thicknesses and Moho depths. We show that the northeasternmost South China Sea basin, which
may have undergone unique evolution since the late Mesozoic, is markedly different from the central South China Sea basin
and the Huatung Basin, both geologically and geophysically. The Cenozoic evolution of the region was largely influenced by
pre-existing weaknesses due to tectonic inheritance and transition. The South China Sea experienced multiple stages of Cenozoic
extension. 相似文献
9.
Rui Sun Ming Ma Kai Zhong Xiayang Wang Zhao Zhao Shuai Guo Xingzong Yao Gongcheng Zhang 《海洋学报(英文版)》2021,40(2):123-135
In this study, element geochemistry and zircon chronology are used to analyze the Oligocene sediments in the Baiyun Sag, Zhujiang River Mouth Basin. The experimental results are discussed with respect to weathering conditions, parent rock lithologies, and provenances. The chemical index of alteration and the chemical index of weathering values of mudstone samples from the lower Oligocene Enping Formation indicate that clastic particles in the study area underwent moderate weathering. Mudstone samples exhibit relatively enriched light rare earth elements and depleted heavy rare earth elements, "V"-shaped negative Eu anomalies, and negligible Ce anomalies. The rare earth element distribution curves are obviously right-inclined, with shapes and contents similar to those of post-Archean Australian shale and upper continental crust, indicating that the samples originated from acid rocks in the upper crust. The Hf-La/Th and La/Sc-Co/Th diagrams show this same origin for the sediments in the study area. For the samples from the upper Enping deltas, the overall age spectrum shows four major age peaks ca. 59–68 Ma, 98–136 Ma, 153–168 Ma and 239–260 Ma. For the Zhuhai Formation samples,the overall age spectrum shows three major age peaks ca. 149 Ma, 252 Ma and 380 Ma. The detrital zircon shapes and U-Pb ages reveal that during Oligocene sedimentation, the sediments on the northwestern margin of the Baiyun Sag were supplied jointly from two provenances: Precambrian-Paleozoic metamorphic rocks in the extrabasinal South China fold zone and Mesozoic volcanic rocks in the intrabasinal Panyu Low Uplift, and the former supply became stronger through time. Thus, the provenance of the Oligocene deltas experienced a transition from an early proximal intrabasinal source to a late distal extrabasinal source. 相似文献
10.
南海北部陆坡发育众多海底峡谷,其形成、发育、演化过程都存在较大差异。本文选取南海北部陆坡典型的珠江口外海底峡谷群、东沙海底峡谷、台湾浅滩南海底峡谷和澎湖海底峡谷进行研究,通过高分辨率多道地震数据和多波束测深数据,结合前人研究成果,对4条典型海底峡谷的形态特征、沉积充填特征及结构、形成发育过程及控制因素进行研究。结果表明,南海北部陆缘各个海底峡谷的形成受多个控制因素的影响,其影响程度及方式都有差别。构造活动、海平面变化及沉积物重力流与海底峡谷的演化密切相关,而陆地河流和局部构造因素也以不同方式影响着海底峡谷的发育。对于发育在主动大陆边缘的台湾岛东南侧的澎湖海底峡谷,其板块运动和岩浆活动活跃,其上发育的海底峡谷的控制因素以内营力地质作用为主。而具有被动大陆边缘属性的其他3条峡谷,由于构造运动较少或停止,其上发育的海底峡谷的控制因素以外营力地质作用为主。 相似文献
11.
琼东南盆地中央峡谷的形态及成因 总被引：11，自引：0，他引：11
琼东南盆地中央峡谷平面上呈"S"型、NE向展布,西起莺歌海盆地中央凹陷带,经乐东凹陷、陵水凹陷、松南凹陷、宝岛凹陷、长昌凹陷,向东延伸进入西沙海槽。剖面形态上存在"V"型、"W"型、"U"型和复合型等4种类型。通过不同区域峡谷下切底界面的形态变化及充填特征,将中央峡谷划分为东段、西段和转换段3个区段,转换段与琼东南盆地的构造转换段相一致,即以西地区控凹断裂为NE向,而以东地区控凹断裂渐变为NEE或EW向。琼东南盆地中央峡谷的成因与构造作用和深水沉积作用关系密切,峡谷东段主要受构造作用控制,特别是深部隆起的存在为黄流期中央峡谷的形成提供了"限制性"作用,并且为后期中央峡谷的发育提供了"限制性通道";西段则受深水沉积作用的控制,重力流沉积为中央峡谷的下切和充填提供了来源。每期中央峡谷的形成均稍早于或与该时期陆坡的发育同期,最早形成于盆地东部,并随陆坡的持续向西迁移表现为不断向西上溯,下切能力逐渐减弱。 相似文献
12.
Cui Yuchi Shao Lei Qiao Peijun Pei Jianxiang Zhang Daojun Tran Huyen 《Marine Geophysical Researches》2019,40(2):223-235
Provenance studies of the Central Canyon, Qiongdongnan Basin has provided significant insights into paleographic and sedimentology research of the South China Sea (SCS). A suite of geochemical approaches mainly including rare earth elemental (REE) analysis and detrital zircon U–Pb dating has been systematically applied to the “source-to-sink” system involving our upper Miocene–Pliocene Central Canyon sediments and surrounding potential source areas. Based on samples tracing the entire course of the Central Canyon, REE distribution patterns indicate that the western channel was generally characterized by positive Eu anomalies in larger proportion, in contrast to the dominance of negative values of its eastern side during late Miocene–Pliocene. Additionally, for the whole canyon and farther regions of Qiongdongnan Basin, the number of samples bearing negative Eu anomalies tended to increase within younger geological strata. On the other hand, U–Pb geochronology results suggest a wide Proterozoic to Mesozoic age range with peak complexity in Yanshanian, Indosinian, Caledonian and Jinningian periods. However in detail, age combination of most western samples displayed older-age signatures than the eastern. To make it more evidently, western boreholes of the Central Canyon are mainly characterized with confined Indosinian and Caledonian clusters which show great comparability with mafic-to-ultramafic source of Kontum Massif of Central Vietnam, while eastern samples largely bear with distinguishable Yanshanian and Indosinian peaks which more resemble with Hainan Island. Based on geochemistry and geochronology analyses, two significant suppliers and sedimentary infilling processes are generated: (1) the Indosinian collision orogenic belt in central-northern Vietnam, Indochina has ever played significant role in Central Canyon sedimentary evolution, (2) Hainan Island once as a typical provenance restricted within eastern Central Canyon, has been enlarging its influence into the whole channel, even into the farther western regions of Qiongdongnan Basin.
相似文献13.
中国东部海区及邻域区域构造图的编制方法及地质构造单元划分 总被引：1，自引：0，他引：1
我国东部海区及邻域1:1 000 000地质地球物理系列图将于2008年底出版,区域构造图是其中的主要专业图件之一。讨论了该专业图件的编图方法、地质构造单元的划分方法和主要地质构造单元。首次对黄海东海区进行了全面剥皮编图,剥去了Q+N2地层。对于沉积盆地用等厚度线表示出了新生界的厚度。地质构造单元划分方法是以板块构造理论为指导并以现今的构造特征为主要划分依据。板块内构造单元的划分是在总结国内外多种构造单元划分方法的基础上进行了修改完善,完成了对我国东部海区及邻域的地质构造单元的划分。区内一级构造单元为板块(太平洋板块、欧亚板块和菲律宾海板块),二级构造单元为构造域(东亚大陆构造域、东亚大陆边缘构造域和西太平洋构造域)。西太平洋构造域主要包括太平洋板块的西部及菲律宾海板块。欧亚板块在该区的部分可分为东亚大陆边缘构造域和东亚大陆构造域。东亚大陆边缘构造域由日本琉球岛弧、冲绳海槽弧后盆地、日本海弧后盆地等次级构造单元构成。东亚大陆构造域在该区内由中朝地块、扬子地块、华南地块等次级构造单元构成。各地块又可划分出盆地、隆褶带、隆起区等多个次一级地质构造单元。最低一级的地质构造单元为凸起和凹陷。 相似文献
14.
台湾海峡盆地的地质构造特征及演化 总被引：4，自引：0，他引：4
分析了台湾海峡盆地形成的区域地质背景,将其纳入东海和南海盆地形成的框架内考虑,研究其区域演化阶段和盆地演化特征。结果表明,以台湾海峡盆地为中心的包括南海北部陆缘和东海在内的中国东南沿海地区在古新世—始新世期间处于统一的边缘海盆构造背景之下,而自晚始新世起,南海北部大陆边缘与其北部的台湾海峡地区、东海逐渐走上了不同的演化道路,前者向非典型的被动大陆边缘演变,而后者则继续其自古新世—始新世以来的演化进程,形成了自古新世至晚中新世间的4个有序分布的裂陷盆地群和相应的盆间弧体系。台湾海峡盆地有两次独特的前陆盆地经历,分别发生于晚渐新世—早中新世和晚中新世末至今,并且以第二次前陆最为强烈。 相似文献
15.
Zengxue Li Qingbo Zeng Meng Xu Dongdong Wang Guangzeng Song Pingli Wang Xiaojing Li Xue Zheng 《海洋学报(英文版)》2021,40(2):95-106
In the present study, the coal-rock organic facies of Oligocene Yacheng Formation of the marginal basin in the South China Sea were classified and divided. In addition, through the correlations of the large-scale coal-bearing basins between the epicontinental sea and the South China Sea, it was concluded that the coal forming activities in the South China Sea presented particularity and complexity. Furthermore, the coal forming mechanisms also presented distinctiveness. The marginal basins in the South China Sea consist of several large and complex rift or depression basins, which are distributed at different tectonic positions in the South China Sea. Therefore, the marginal basins in the South China Sea are not simple traditional units with onshore continental slopes extending toward the deep sea. The marginal basins are known to consist of multi-level structures and distinctive types of basins which differ from the continental regions to the sea. During the Oligocene, the existing luxuriant plants and beneficial conditions assisted in the development of peat. Therefore, the Oligocene was the significant period for the formation and aggregation of the peat. However, the peat did not form in unified sedimentary dynamic fields,but instead displayed multi-level geographical units, multiple provenance areas, instability, and nonevent characteristics. As a result, the marginal basins in the South China Sea are characterized by non-uniform peat aggregation stages. In another words, the majority of the peat had entered the marine system in a dispersive manner and acted as part of the marine deposits, rather than during one or several suitable coal-forming stages.These peat deposits then became the main material source for hydrocarbon generation in all of the marginal basins of the South China Sea. The study will be of much significance for the hydrocarbon exploration in the marginal basins of the South China Sea. 相似文献
16.
南黄海盆地是在前震旦系克拉通基础上发育的中、古生界海相与中、新生界陆相多旋回叠合盆地。通过地震资料解释,结合邻区钻井与区域地质资料,对南黄海盆地中部隆起中、古生代地层及其形成演化进行了研究,结果表明,南黄海盆地中部隆起沉积了较全的中、古生界海相地层,发育第四系—新近系、中—下三叠统青龙组、上二叠统、下二叠统—上泥盆统、中—下志留统,奥陶系—震旦系和前震旦系变质岩系等7套地震地质层序;主要经历了前震旦纪基底形成、震旦纪—早古生代克拉通发育、晚古生代—中三叠世稳定台地—陆内裂陷、晚三叠世—古近纪形成与抬升剥蚀及新近纪-第四纪坳陷沉降5个阶段。 相似文献
17.
华南中生代岩相变化及海相地层时空分布 总被引：17，自引：3，他引：17
在搜集大量资料的基础上，分析了华南中生代地层时代、岩性、岩相对比关系，重点综述了中生代海相地层的时空分布特征。受所处构造部位的控制，华南中生代岩相时空变化总体上可分为3个区：东区(闽西南-粤东-粤北-粤中)、中区(粤西-桂东)、西区(滇西-滇东南)。中区在早三叠世以后完全隆升成陆，仅局部有山间盆地碎屑沉积。海相地层集中于东西两区，但存在明显的东西差异：海侵时间在东区为早三叠世、晚三叠世-早侏罗世和早白垩世，西区为中三叠世和中侏罗世；海侵方向在东区来自东南，西区则为中特提斯滇缅海的-部分。晚三叠世-早侏罗世的粤东海盆发育厚达5000m的海相和海陆交互相沉积，可能向南延伸到台西南盆地和南沙群岛东部，但它与南海西部围区的同时代海盆并不直接相通。 相似文献
18.
Dorrik A. V. Stow 《Geo-Marine Letters》1984,3(2-4):217-222
The Brae oilfield reservoir in the North Sea comprises Upper Jurassic resedimented conglomerates and sandstones interbedded
with organic-rich silstone and mudstone thin-bedded turbidites. The system represents a series of small overlapping fans that
form a thick (300 m) slope-apron accumulation of sediments deposited in a narrow (<10 km wide) belt along an active fault
zone. The complex lateral and vertical distribution of facies was due mainly to variable tectonic activity, and partly also
to sediment supply and sea-level changes.
Margin setting represents fan and/or source area 相似文献
19.
海底峡谷在全球陆缘广泛分布,是浅海沉积物向深海运移的主要通道,对于理解深海浊流触发机制、深海沉积物的搬运模式、深海扇的发育历史和深海油气资源勘探等均具有重要意义。本文基于高分辨率高精度的多波束测深数据,首次对南海东北部海底峡谷体系进行了研究,精细刻画了高屏海底峡谷、澎湖海底峡谷、台湾浅滩南海底峡谷和东沙海底峡谷等4条大型海底峡谷的地貌特征并分析其发育控制因素。海底坡度、构造运动、海山与海丘是影响南海东北部峡谷群走向与特征的重要因素,其中,海底坡度对于峡谷上游多分支与“V”字特征有显著的控制作用;构造运动是控制高屏海底峡谷走向的因素,澎湖海底峡谷的走向则与菲律宾海板块与欧亚板块碰撞有关,东沙海底峡谷的走向则与东沙运动相关,台湾浅滩南海底峡谷上段受NW向断裂构造的控制;海山的阻挡作用造成峡谷局部走向和特征改变。海底峡谷群输送大量陆源沉积物到深海盆并形成大面积的沉积物波,海山和沉积物波的发育导致东沙海底峡谷下段“回春”和转向。 相似文献
20.
Weina Zhao Zhiqiang Wu Fanghui Hou Xunhua Zhang Tianyao Hao Hanjoon Kim Yanpeng Zheng Shanshan Chen Huigang Wang 《海洋学报(英文版)》2023,42(2):104-119
The South Yellow Sea basin is filled with Mesozoic–Cenozoic continental sediments overlying pre-Palaeozoic and Mesozoic–Palaeozoic marine sediments. Conventional multi-channel seismic data cannot describe the velocity structure of the marine residual basin in detail, leading to the lack of a deeper understanding of the distribution and lithology owing to strong energy shielding on the top interface of marine sediments. In this study, we present seismic tomography data from ocean bottom seismogra... 相似文献