长江口岸带冲淤及后备土地资源的沉降效应——以上海崇明东滩为例   总被引：2，自引：0，他引：2  

龚士良  杨世伦 《水文》2007,27(5):78-82

长江口入海泥沙的淤积是上海后备土地资源的重要来源，分析岸带冲淤的演变．有助于对岸带经济圈特别是围垦促淤地区因经济工程活动引发的地面沉降问题的剖析。本文以上海崇明东滩为例，分析30年来的冲淤变化及未来趋势，并据此对新近沉积土的地面沉降效应作简要阐述。  相似文献   

平潭岛海蚀花岗岩地貌——兼述花岗岩地貌的系列研究和创新   总被引：1，自引：0，他引：1       下载免费PDF全文

杨逸畴  尹泽生 《地质论评》2007,53(B08):125-131,241

平潭县有“千礁岛县”之称，所属的海潭为全国第五大岛，隔台湾海峡与台湾新竹相距仅68海里，是祖国大陆距台湾最近的地方。千礁岛县皆由花岗岩组成，潮涨潮落，海侵海蚀，铸就了岛上古代海蚀地貌和现代海蚀地貌，且种类齐全，典型奇特，分布广泛，集神、幽、险、趣于一体，尤其花岗岩球状风化铸成的，最突出的有国内最大的海蚀柱、天下奇观“半洋石帆”；浑身赤裸，形体逼真，比四川乐山大佛大四倍的“海坛天神”，横卧海边，头枕沙滩，腿伸大海；等等。素有花岗岩海蚀地貌“甲天下”之称。平潭已开发成国家级风景旅游区，其花岗岩海蚀地貌研究必将为中国研究花岗岩地貌增添新的内容和活力；平潭岛的区位最近台湾，优先利用双休日或节假日开展与台湾北东海岸的类同海蚀地貌进行双向互惠的观光旅游，将有无限广阔、美好前景。  相似文献   

Early Cretaceous volcanic rocks and Early Cenozoic extrusions of Cape Mary, Schmidt Peninsula, north Sakhalin: Geochemical study     

V. P. Simanenko  S. V. Rasskazov  T. A. Yasnygina  A. I. Malinovskii  A. A. Chashchin 《Russian Journal of Pacific Geology》2007,1(3):265-275

The Early Cretaceous volcanic rocks of the Mariisky sequence and Early Cenozoic extrusive-vent rocks of Cape Mary are exposed at the northwestern extremity of Schmidt Peninsula, north Sakhalin. In chemical composition, all the rocks are subdivided into four groups. Three groups include the volcanic rocks of the Mariisky sequence, which consists, from bottom to top, of calc-alkaline rocks, transitional calc-alkaline-tholeiite rocks, and incompatible element-depleted tholeiites. These rocks show subduction geochemical signatures and are considered as a fragment of the Moneron-Samarga island arc system. Trace-element modeling indicates their derivation through successive melting of garnet-bearing mantle and garnet-free shallower mantle sources containing amphibole; pyroxene; and, possibly, spinel. The mixed subduction and within-plate characteristics of the extrusive vent rocks of Cape Mary attest to their formation in a transform continental margin setting.  相似文献   

Shallow seismic refraction analysis: Application to studying the active North Sakhalin fault     

V. V. Zhigulev  V. N. Patrikeev 《Russian Journal of Pacific Geology》2007,1(1):15-21

Results are presented from a seismic refraction survey (P-S waves) carried out in different years on recent faults of North Sakhalin. Structural features of the near-surface zone of active faults with different types of tectonic motions and their imaging in seismic fields are demonstrated. Criteria for estimating the activity of the studied tectonic disruption are proposed.  相似文献   

Preliminary study on pisionids (Annelida: Polychaeta Pisionidae) from Hainan Island coastal waters, South China Sea     

Wu Bao-ling  Ding Zhi-hu  Huang Feng-peng 《中国海洋湖沼学报》1998,16(2):149-160

Of the four species ofPisione Grube (1856) collected from the coastal waters of Hainan Island, the South China Sea, and described in this paper,Pisione hainanensis n. sp. is new to science;Pisione oerstedii Grube, 1857;Pisione complexa Alikunhi, 1947, and Pisione levisetosa Zhao, Westheide & Wu, 1991 are reported for the first time from this area. Project 38970187 supported by NSFC.  相似文献   

海南岛几个重大基础地质问题的探讨   总被引：25，自引：0，他引：25  

张业明  徐安武 《地质论评》1998,44(6):568-575

海南岛有无泥盆纪地层？有无加里东运动？有无加里东期花岗岩？历来是大家关注和争论的焦点问题。在１：５万昌江县幅和邦溪幅地质调查研究中,笔者对上述问题进行了探讨,并取得了一些重要进展：首次在海南岛发现珊瑚化石Ｃｙｓｔｏｐｈｒｅｎｔｉｓ ｋａｌａｏｈｏｅｎｓｉｓ Ｙｕ,结合旋回地层学研究主为,在昌江县鸡心－鸡实一带南好组（Ｃ１ｎ）中下部可能存在中晚泥盆世地层;首次发现并圈定了加里东期花岗岩体,时代为３６  相似文献   

海南岛上新世地层特征及岩石地层单位     

陈哲培 《地质通报》1998,(4)

琼北断陷盆地及海南岛西南沿海地区（暂名佛罗盆地）分布新第三纪上新世海相沉积地层。对于采用岩石地层单位有不同意见,有的主张前者采用望楼港组而后者采用莺歌海组。笔者认为前者应采用海口组,而后者采用望楼港组。  相似文献   

Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance     

Xing Guangfu  Jin Qingmin 《极地研究(英文版)》2000,11(2)

Plagioclases occur mainly as phenocrysts in volcanic rocks of King George Island, South Shetland Islands, West Antarctica. In basaltic andesites and andesites of Keller Peninsula and Ullman Spur (Admiralty Bay), they are high structure state labradorite-andesines; and in high-A1 basalts and basaltic andesites of Barton and Weaver peninsulas (Maxwell Bay), they are high structure state bytownite-anorthites.∑REE, La/Yb ratios and δEu values of plagioclases from Admiralty Bay are higher than those from Maxwell Bay. All plagioclases have rather identical chondritenormalized transitional element distribution patterns, probably reflecting that crystal structure rather than composition of plagioclase controls their diversity. Compositions of plagioclases depend chiefly on those of their host rocks, compositional differences of plagioclases reveal that basaltic magmas in the Admiralty Bay area are more evolved than in the Maxwell Bay area.  相似文献   

Investigating internal waves east of the Hainan Island using optical satellite remote sensing data   总被引：1，自引：1，他引：0  

杨顶田 《热带海洋学报》2009,28(5):29-34

Marginal water of east Hainan Island was an area that internal waves occurred frequently, however, few studies was found and mechanism for internal waves formation was unclear. In the paper, China Brazil earth Resources Satellite data (CBERS) was used to detect and calculate distribution, direction, wavelength and amplitude of internal waves in marginal water of east Hainan Island and the mechanism of internal waves formation was also analyzed, results showed that direction of internal wave was off shoreward and wavelength was about 150-200m . The mechanism for internal wave’s formation can be postulated as by upwelling or tide tracing back.  相似文献   

Denitrification in Qi''ao Island coastal zone, the Zhujiang Estuary in China   总被引：1，自引：0，他引：1  

WANG Hu  ZHOU Huaiyang  PENG Xiaotong  YANG Qunhui  QIN Chaomei  YIN Xijie  CHEN Guangqian 《海洋学报(英文版)》2009,28(1):37-46

Samples of sediments and the overlying water were collected in the Qi'ao Island coastal zone, the Zhujiang (Pearl River) Estuary (ZE). Denitrification rates, sediment oxygen demand (SOD) , and fluxes of inorganic nitrogen compounds were investigated with N2 flux method, using a self-designed continuous flow through and auto-sampling system. The results indicate that the denitrification rates varied between 222 and 908 μmol/(m2·h) with an average of 499 μmol/(m2·h). During incubation, the sediments absorbed dissolved oxygen in the overlying water with SOD ranging from 300 to 2 363 μmol/(m2·h). The denitrification rates were highly correlated with the SOD (r2 =0.77) regardless of the NO3- + NO2- concentrations in the overlying water, organ- ic carbon contents in sediments and water temperature, suggesting that the SOD was probably the main environ-mental factor controlling the denitrification in the Qi'ao Island coastal zone. There was a net flux of NO3- + NO2-into the sediments from the overlying water. The NH4+ flux from sediments into water as the result of mineraliza-tion was between 12. 3 and 210. 3 μmol/(m2·h) ,which seems limited by both organic carbon content in sedi-ment and dissolved oxygen concentration in the overlying water.  相似文献