鲁中南隆起区第四纪晚期断裂活动特征   总被引：6，自引：1，他引：6  

王志才  石荣会  晁洪太  陶九庆  韩延宏  逄锦亮  张春华 《海洋地质与第四纪地质》2001,21(4):95-102

根据野外调查，并综合前人的研究资料，对鲁中南地区第四纪晚期断裂活动进行了分析，研究表明，鲁中南隆起区第四纪断裂活动具有时空不均匀性，主要表现为第四纪时期断层活动强度变化和断裂活动的群集性以及第四纪晚期断裂活动段分布的局限性上。对于鲁中南地区而言，活动断层可以分为中更新世中期（500kaBP)至晚更新世初期（90kaBP)活断层和晚更新世中、晚期至全新世早期活断层两类；其中前一类（主要是中更新世断裂）断裂数量较多，分布较为广泛，而晚更新世晚期以来的活动断裂段的数量较少，分布较局限。它们对地震的控制能力不同，前者可控制5．5级左右的地震，而后一类可控制6－7级地震的发生。  相似文献   

On the long-term joint distribution of characteristic wave height and period and its application     

Fang Zhongsheng  Dai Shunsun  Jin Chengyi 《海洋学报(英文版)》1989,8(3):315-325

By analysing the scatter diagrams of characteristic the wave height H and the period T on the basis of instrumental data from various ocean wave stations, we found that the conditional expectation and standard deviation of wave period for a given wave height can be better predicted by using the equations of normal linear regression rather than by those based on the log- normal law. The latter was implied in Ochi' s bivariate log-normal model(Ochi. 1978) for the long-term joint distribution of H and T. With the expectation and standard deviation predicted by the normal linear regression equations and applying proper types of distribution, we have obtained the conditional distribution of T for given H. Then combining this conditional P(T / H) with long-term marginal distribution of the wave height P(H) we establish a new parameterized model for the long-term joint distribution P(H,T). As an example of the application of the new model we give a method for estimating wave period associated with an extreme w  相似文献   

大别山地区石榴石橄榄岩的岩石学和地球化学     

韩宗珠 《中国海洋大学学报(自然科学版)》1989,(4)

本文首次对我国石榴石橄榄岩类岩石进行系统的岩石学和地球化学研究。通过对大别山地区两个不同类型岩体中的石榴石橄榄岩的岩石学、岩石化学、矿物化学和稀土元素地球化学研究,表明这类岩石属钙碱性系列超基性岩;与地幔成分相比,富集易熔元素,亏损难熔元素;利用矿物地质温压计估算其形成压力为2×10~9pa,成岩温度为600～700℃具有正铕异常和轻稀土元素富集特征 推测为地壳下部的超基性岩经深成变质而成。  相似文献   

安徽宣城地区中晚更新世风成堆积与环境变迁   总被引：25，自引：7，他引：25  

杨达源  房迎三 《海洋地质与第四纪地质》1991,11(2):97-104

通过对宣城向阳中晚更新世沉积剖面的综合研究,认为该剖面与中国北方同时代的黄土—古土壤剖面相比较,虽然长江下游以南地区中晚更新世多个冰期中风成堆积的单层厚度与累积厚度,亦即风成物质的沉积通量与沉积速率均比北方黄土区要小,但它们所反映的气候与环境的变化具有明显的可比性。  相似文献   

Glaciomarine sedimentation and palaeo-glacial setting of Maxwell Bay and its tributary embayment, Marian Cove, South Shetland Islands, West Antarctica     

Ho Il Yoon  Myung Woo Han  Byong-Kwon Park  Jae-Kyung Oh  Soon-Keun Chang 《Marine Geology》1997,140(3-4):265-282

High-resolution (3.5 kHz and multi-channel) seismic profiles and piston cores were collected from Maxwell Bay and its tributary embayment, Marian Cove, in the South Shetland Islands, Antarctica, during the Korea Antarctic Research Program (1992/93 and 1995/96) to elucidate the glaciomarine sedimentation processes and recent glacial history of the area. Seismic data from Maxwell Bay reveal a rugged bay margin and flattened basin floor covered with well-stratified hemipelagic muds. On the base-of-slope, acoustically transparent debris flows occur, indicating downslope resedimentation of glaciomarine sediments. Despite the subpolar and ice-proximal settings of Marian Cove, the seafloor is highly rugged with a thin sediment drape, suggesting that much of the area has been recently eroded by glaciers. Sediment cores from the cove penetrated three distinct fining-upward lithofacies: (1) basal till in the lower part of the core, accumulated just seaward of the grounding line of the tidewater glacier; (2) interlaminated sand and mud in the middle part, deposited in ice-proximal zone by a combination of episodic subglacial meltwater inflow and iceberg dumping; and (3) pebbly mud in the upper part, deposited in ice-distal zone by both surface meltwater plume and ice-rafting from the glacier front. A reconstruction of the glacial history of these areas since the late glacial maximum shows an ice sheet filling Maxwell Bay in late Wisconsin time and grounding of the tidewater glacier in Marian Cove until about 1300 yr BP.  相似文献   

太阳黑子、厄尔尼诺及西北太平洋热带气旋的活动   总被引：4，自引：0，他引：4  

毛祖松  金德山 《海洋预报》1996,(4)

本文用１９００～１９９４年的资料，以统计分析的方法，对太阳黑子，厄尔尼诺及西北太平洋热带气旋活动的相互关系，进行了初步探讨，归纳出几点有参考价值的结论  相似文献   

柴达木盆地昆特依盐湖的地球化学演化与古气候变化   总被引：9，自引：1，他引：9  

韩凤清  黄麒  王克俊  王华安  原力 《海洋与湖沼》1995,26(5):502-508

１９９０年用铀系年代学及古地磁对昆特依盐湖沉积物进行年代测定，探讨该湖区地球化学演化与古气候变化关系。结果表明，该区最老的盐层形成于早更新世晚期（大于７３０ｋａ），大量的盐类沉积则始于３００ｋａ左右；盐湖沉积物中元素含量变化主要受古盐度、矿物、类质同象和吸附控制；沉积物水溶Ｆ／Ｃｌ比值与古盐度成反比关系；该湖２０００ｋａ以来的古环境演变：盐层形成于干冷、偏酸性的氧化环境，泥岩层形成于湿暖、偏碱性的  相似文献   

Variation of reactivity of particulate and sedimentary organic matter along the Zhujiang River Estuary   总被引：3，自引：0，他引：3  

Chen Jianfang  Jin Haiyan  Yin Kedong  Li Yan 《海洋学报(英文版)》2003,22(4):557-568

To investigate organic matter source and reactivity in the Zhujiang River (Pearl River)Estuary and its adjacent areas, particulate organic carbon (POC), particulate hydrolysable amino acids (PHAA), and Chl a during two cruises in July 1999 and July 2000 were measured. The highest POC and PHAA concentration was observed in the waters with maximum Chl a. The spectra distribution,relative content (dry weight in milligram per gram), PHAA-C% POC and other indicators such as the ratios of amino acids vs. amino sugars (AA/AS) and glucosamine vs. galactosamine (Glum/Gal) suggested that particulate amino acids in the water column and sediments in the Zhujiang River Estuary were mainly derived from biogenic processes rather than transported from terrestrial erosion. In inner estuary where high turbidity was often observable, organic matter was mainly contributed by re-suspension of bottom sediments with revealed zooplankton, microbial reworked characteristics, which suggest that these organic matters were relatively “old“. In the estuarine brackish region, organic matter in water column is mainly contributed by relatively fresh, easily degradable phytoplankton derived organic matter.During physical - biological processes within the eastuary, organic matter derived from phytoplankton was subjected to alteration by zooplankton grazing and bacterial reworking.  相似文献   

Simulation of green water flow on deck using non-linear dam breaking theory     

O. Yilmaz  A. Incecik  J. C. Han 《Ocean Engineering》2003,30(5):601-610

Experiments carried out with models of floating production, storage and offloading platforms (FPSOs) showed that the flow of water over the deck edge, onto the deck resembled a suddenly released wall of water rather than a breaking wave. Therefore green water flow onto the deck was simulated using dam breaking theory, but the theory’s shallow-water assumptions may be limiting. In this paper a non-linear dam breaking problem is formulated. Equations of motion in the Lagrangian form are used and the solution is sought as an infinite series in time. Comparisons with the shallow water approximation are carried out.  相似文献   

赤潮生物种类特征光谱获取技术   总被引：1，自引：0，他引：1  

范学炜  张汉德 《海洋科学进展》2002,20(2):83-90

较为系统地研究了赤潮生物水体反射率曲线获取方法。通过对 2类反射率反演方法得出的反射率曲线与实际反射率曲线进行比较 ,得出在不具备大气环境参数的情况下 ,经验线性法的反演结果与实际反射率曲线最接近的结论 ,并进一步对正常海水和赤潮生物水体的光谱特性进行分析 ,提取出赤潮生物水体的特征光谱。这是进行赤潮监测和识别的重要前提  相似文献