美丽的黄海明珠——江苏赣榆

素以“享山川之饶,受渔盐之利”著称的福地——赣榆县,地处苏鲁交界,海州湾畔,有“江苏北大门”之称。全县总面积1402.5平方千米,耕地面积6.87万公顷,下辖18个镇,435个行政村,人口104万。境内有孔子相鲁会齐侯的夹谷山,秦始皇鞭石成桥的秦山神路,山清水秀,物华地肥,气候宜人,     

南黄海新构造运动

定义了南黄海新构造运动的概念;提出了南黄海新构造运动的研究方法;阐明了南黄海新构造运动的机理,即受滨西太平洋构造域控制,是在老构造基础上的继承和发展;描述了南黄海新构造运动的基本特征;总结了南黄海新构造运动的研究意义。     

胶莱盆地向南黄海延伸——来自南黄海地震剖面的新证据

总结了前人对胶莱盆地形成机制、东部边界、地层发育及油气地质研究进展及存在问题。利用最新采集的二维地震剖面资料,对胶莱盆地海阳凹陷的盆地结构、地层发育及主控断裂进行了描述,估算了其海域分布面积,并探讨了其可能的形成机制。认为海阳凹陷是一个东断西超的箕状断陷,其主控断裂为东部边界断裂,可能是泗阳—连云港—千里岩—开城断裂的一部分,现今仍在活动。海阳凹陷西部陆上生油层系出露地表遭受破坏,但凹陷主体位于南黄海海域,有较好的生油层,生储盖组合配套好,且未遭受岩浆活动破坏,可能有较好的油气前景。     

南黄海区域地质构造研究进展

介绍了近年来南黄海及邻域区域地质构造的研究成果,针对海区各断裂带的位置、延伸程度,中朝与扬子块体、扬子与华南块体的结合带等方面存在的问题,就如何进一步开展区域地质研究工作做了探讨。     

南黄海海底地势分区

本文对南黄海海底地势分区进行了研究,结果表明,南黄海是半封闭的内陆浅海,为新生代沉积盆地,深受外力作用的塑造。海底由西部缓倾斜地势区、西南部辐射状地势区、东部朝鲜半岛西岸水下冲刷槽沟地势区和中部浅海平原及黄海海槽地势区组成,形成由东西两侧向中部缓倾斜的基本面貌。     

南黄海春季水团分析

根据１９９２年５月在南黄海取得的ＣＴＤ资料和两个断面的温，盐度和溶解氧资料，和“对应在分析法”研究该海域的水团配置和特性，并对其中的某些问题进行探讨。结果表明：春季，南黄海海域存在８个水团，即黄海水、贰黄海冷水团，青岛冷水团，黄海暖流水以及长江冲淡水，苏北沿岸水，成山角冷水和朝鲜西岸沿岸水；     

蛎岈山——黄海之滨的璀璨明珠

蛎岈山,位于江苏省海门市东灶港港口东北约4海里的黄海,方圆约3.5万平方千米,是由神赐摩食,海中牛奶之称的牡蛎活体堆积成的生物岛礁,也是国家级海洋特别保护区。近年来,海门市不仅加大蛎岈山的保护力度,而且不断加以拓展开发,打造一个集旅游观光、营养美食、人文研究等为一体的综合基地,雕琢一颗黄海之滨的璀璨明珠。     

蛎岈山——黄海之滨的璀璨明珠

蛎岈山，位于江苏省海门市东灶港港口东北约4海里的黄海中，方圆约3．5万平方千米。蛎岈山是由有“神赐摩食，海中牛奶”之称的牡蛎活体堆积成的生物岛礁，是国家级海洋特别保护区。近年来，海门市不仅加大对蛎岈山的保护力度，而且不断加以拓展开发。努力打造一个集旅游观光、营养美食、人文研究等为一体的综合基地，雕凿一颗黄海之滨的璀璨明珠。     

南黄海西部的沉积环境

地质矿产部第一海洋地质调查大队于1972—1979年期间,对南黄海东经123°以西至山东、江苏近岸5米等深线之间的海区进行过系统的线距为10公里的海底地形调查,点距10×10—10×5公里的沉积物取样,并对沉积物样品进行了实验分析,本文是在上述调查基础上写成的.沉积环境是指沉积时的条件.这种条件包括沉积物周围介质的物理、化学性质,如水动力强弱、海水盐度、元素及含量等;也包括物质来源的途径和多寡、生物的加入和作用等;而沉积物的粒径大小、比重、形状和化学性质也是重要的方面.现代海底沉积物则是这些条件综合作用下形成的产物.研究现代环境将为将今论古提供依据,用现代已知条件下形成的沉积物特征、结构、构造对古沉积物进行类比,从而得出古环境,为寻找古沉积矿产打下基础.     

南黄海的海底侵蚀作用

１９９２年５月－１９９３年１０月期间,在南黄海及东海北部海域,利用大洋５０型表层取样器,重力活塞取样及底栖拖网等方法,对海底沉积进行了深入的调查,通过对所获样品的粒度,矿物含量,生物组合及年代地层学多学科综合性的分析研究表明,南黄海及东海北部陆架的沉积环境十分复杂,在南黄海高能侵蚀区海底广泛出露砂质沉积物,其分布范围与强潮夕及风暴潮的活动区相一致,在这些水动力的长期作用下,细粒物质逐渐被悬浮,搬运     

江苏如东紫菜增养殖区水环境质量评价

文章对2016年江苏省如东紫菜增养殖区的水质监测数据进行了分析评价,并结合2014年和2015年的监测数据,将3年的监测结果进行比较,结果表明:如东紫菜增养殖区的水温、盐度和pH值适合紫菜生长,虽然近3年均有所变化,但仍有利于紫菜养殖;化学需氧量、溶解氧、无机氮、石油类均符合一类海水水质标准,且年际变化较小;重金属含量均符合一类海水水质标准。但石油类、砷含量正逐年增加,海水中活性磷酸盐含量超出一类海水标准,有机污染指数表明水质开始受到污染状态,应引起重视。     

Morphotectonics and evolutionary controls on the Pearl River Canyon system, South China Sea

The Pearl River Canyon system is a typical canyon system on the northern continental slope of the South China Sea, which has significant implications for hydrocarbon exploration. Through swath bathymetry in the canyon area combined with different types of seismic data, we have studied the morphotectonics and controlling factors of the canyon by analyzing its morphology and sedimentary structure, as well as the main features of the continental slope around the canyon. Results show that the Pearl River Canyon can be separated into three segments with different orientations. The upper reach is NW-oriented with a shallowly incised course, whereas the middle and lower reaches, that are located mainly in the Baiyun Sag, have a broad U-shape and have experienced consistent deposition. Seventeen deeply-cut canyons have developed in the slope north of the Baiyun Sag, playing an important role in the sedimentary processes of the middle and lower reaches of the Pearl River Canyon. These canyons display both asymmetrical V- and U-shapes along their lengths. Numerous buried channels can be identified below the modern canyons with unidirectionally migrating stacking patterns, suggesting that the canyons have experienced a cyclic evolution with several cut and fill phases of varying magnitude. These long established canyons, rather than the upper reach of the Pearl River Canyon, are the main conduits for the transport of terrigenous materials to the lower slope and abyssal basin during lowstand stage, and have contributed to the formation of vertically stacked deep-water fans in the middle reach. Canyon morphology is interpreted as a result of erosive sediment flows. The Pearl River Canyon and the 17 canyons in the slope area north of the Baiyun Sag probably have developed since the Miocene. Cenozoic tectonics, sea level change and sediment supply jointly control the morphology and sedimentary structure. The middle and lower reaches of the Pearl River Canyon developed on the paleo-terrain of the Baiyun Sag, which has been a persistently rapid depositional environment, receiving most of the materials transported via the canyons.     

Dynamics of heterotrophic dinoflagellates off the Pearl River Estuary,northern South China Sea

Variations in abundance, biomass, vertical profile and cell size of heterotrophic dinoflagellates (HDFs) between summer and winter and its controlling factors were studied in the northern South China Sea (SCS). It was found that HDF abundance and carbon biomass were 4–102 × 10³ cells L⁻¹ and 0.34–12.3 mg C L⁻¹ in winter (February 2004), respectively, while they were 2–142 × 10³ cells L⁻¹ and 0.22–31.4 μg C L⁻¹ in summer (July, 2004), respectively, in the northern SCS. HDF abundance and carbon biomass decreased from the estuary to inshore and then offshore. Vertical profiles of HDF abundance were heterogeneous, which accorded well with that of chlorophyll a (Chl.a). Higher abundance of HDFs was often observed at a depth of 30–70 m offshore waters, matching well with the Chl.a maximum, while it showed high abundance at the surface in some coastal and estuary stations. Small HDFs (≤20 μm) dominated the assemblage in term of abundance accounting for more than 90%. However, large HDFs (>20 μm) generally contributed equally in terms of carbon biomass, accounting for 47% on average. HDFs showed different variation patterns for the different study regions; in the estuarine and continental shelf regions, abundance and biomass values were higher in summer than those in winter, while it was the reverse pattern for the slope waters. Hydrological factors (e.g. water mass, river outflow, monsoon and eddies) associated with biological factors, especially the size-fractionated Chl.a, seemed to play an important role in regulating HDF distribution and variations in the northern South China Sea.     

Cenozoic sedimentary evolution of deepwater sags in the Pearl River Mouth Basin, northern South China Sea

Recent exploration revealed the high potential for hydrocarbon in the deepwater sags, Pearl River Mouth Basin, northern South China Sea. This paper reports its Cenozoic sedimentary evolution through backstripping of high precision depth data of interpreted sequence boundaries. Local backstripping parameters were mapped based on well and geophysical data. Sensitivity analysis indicates that the reliability of decompaction results were largely improved by using the local porosity parameters and the lithological parameters that vary with grid nodes. Maps of sedimentation rates of 17 sequences from 65 Ma to the present were constructed, showing the spatial–temporal variation of the sedimentation rate. Three rapid depositional stages, 65–32, 29–23.3, 18.5–10.5 Ma, and three slow depositional stages, 32–29, 23.3–18.5, 10.5–0 Ma, were identified with abrupt changes of sedimentary patterns. The three rapid depositional stages were in accord with syn-rifting stage, the first post-rifting depositional stage, and the second post-rifting depositional stage, respectively. And the three slow depositional stages were in keeping with three tectonic events respectively. Several significant sedimentary discontinuities at 32, 23.3 and 10.5 Ma were observed and discussed. The comparison between the study area and the ODP Site 1148 at 32–23.3 Ma indicates that before ~29 Ma the ODP Site 1148 was at similar sedimentation regime as that in the Baiyun and Liwan sags, but significant diversity appeared after ~29 Ma, when a large quantity of terrigenous sediments was trapped by strong post-rifting subsidence in the Baiyun and Liwan sags and could not reach the lower slope areas. Study revealed that the most rapid accumulation from 18.5 to 17.5 Ma might be mainly owing to the large sediment supply during this strong monsoon period.     

Fouling in offshore areas southeast of the Zhujiang (Pearl) River Delta, the northern South China Sea

Abstract-In order to understand the type and extent of marine fouling in offshore areas southeast ofthe Zhujiang (Pearl) River delta, within the period form May 1986 to June 1987, two biologicalbuoys were deployed at water depths of 95 m and 113 m located in 114 km and 160 km off the coast ofHong Kong, respectively. Moreover, the fouling community of a Marex hydrological buoy located in115 m depth water 172 km off Hong Kong was also surveyed. The results show that a total of 78species were collected and identified. The panels exposed for 3 months were mainly dominated bystalked barnacles Conchoderma hunteri and Lepas anatifera and hydroids Orthopyxis sp. As for thebuoys, including the subsurface buoy, and their mooring systems exposed for 6 and 12 months, respec-tively, some hard foulers such as common oysters, pearl oysters, acorn barnacles and bryozoans werealso found. The compositions of fouling communities also varied greatly with depth.     

倚岸型潮流脊体系中的深槽冲刷——以江苏如东海岸为例

江苏如东海岸的潮流脊体系位于南黄海辐射状沙脊群南部,由沙脊及脊间深槽组成,为"倚岸型"潮流脊体系。本文采用水平一维模型模拟深槽从初始形态冲刷至均衡态的演变过程,用不同的潮差及初始剖面坡度等参数运行该模型,以了解深槽冲刷深度的主要控制因素及其对深槽均衡态的影响。数值实验结果表明:(1)给定初始剖面的坡度、潮差等参数,经历一定时间的冲刷之后剖面达到均衡态,其后剖面形态保持稳定,不随时间改变;(2)若仅给定初始剖面的坡度,则潮差越大,达到均衡态时深槽的冲刷深度越大,而且潮差的变化对冲刷深度有显著影响;(3)若仅给定潮差,则初始剖面的坡度越大,均衡态时深槽的冲刷深度越小且初始剖面坡度的改变对冲刷深度有显著影响。     

A Review on the Currents in the South China Sea: Seasonal Circulation, South China Sea Warm Current and Kuroshio Intrusion

Researches on the currents in the South China Sea (SCS) and the interaction between the SCS and its adjacent seas are reviewed. Overall seasonal circulation in the SCS is cyclonic in winter and anticyclonic in summer with a few stable eddies. The seasonal circulation is mostly driven by monsoon winds, and is related to water exchange between the SCS and the East China Sea through the Taiwan Strait, and between the SCS and the Kuroshio through the Luzon Strait. Seasonal characteristics of the South China Sea Warm Current in the northern SCS and the Kuroshio intrusion to the SCS are summarized in terms of the interaction between the SCS and its adjacent seas.     

南海珠江口盆地深部烃类微渗漏的分子地球化学揭示

对南海珠江口盆地Site4B站位柱状沉积物可溶有机质中正构烷烃进行详细分析,结果显示海底以下65~70cm、80~85cm和85~90cm存在明显的似成熟烃类分布。在气相色谱质谱图上(GCMS),该处存在明显的UCM分布;在烃类分布上,该处以可溶有机质中高碳数正构烷烃奇偶优势趋于消失为特征,CPI为1.15~1.45。同时,整个剖面其他层段沉积有机质中可溶烃类仍以典型的近/现代沉积有机质输入为标志。结合区域地质背景,以及该区域天然气水合物的勘探发现事实,推断Site4B站位海底以下65~70cm、80~85cm和85~90cm烃类异常可能系深部烃类微渗漏所致。     

珠江口盆地第三纪古地理及沉积演化

珠江口盆地第三纪以来经历了断陷、拗陷两个构造演化阶段,具有“南北分带”、“东西分块”的构造格局和先陆后海的沉积特征。本文根据前人资料进行综合整理,编制了珠江口盆地古近纪神狐组、文昌组、恩平组、珠海组地层和新近纪珠江组地层的岩相古地理图。神狐组发育有冲积扇和河湖相,主要分布在珠三坳陷南断裂的狭长地带。文昌组沉积半深湖—深湖相,恩平组水深变浅,河沼相广泛分布。珠海组岩相古地理发生了较大的变化,为海陆过渡相沉积。随后海平面振荡上升,珠江口盆地处于陆架—陆坡环境,发育浅海—半深海沉积。对整个珠江口盆地岩相古地理图的编制为详细研究盆地内各区块的岩相古地理演变提供了区域背景,也为区域构造演化和油气地质条件的研究提供了基础依据。