海相磷块岩沉积事件研究——以新元古代末—寒武纪成磷事件为例   总被引：1，自引：0，他引：1  

密文天  林丽 《海洋地质前沿》2010,26(4)

磷块岩大规模沉积是古海洋磷循环作用的结果。为解释海相磷块岩成因,提出了各种理论。大规模成磷事件的发生与古海洋条件和古生态环境有关,从C—N—P—O等元素循环来探讨成磷现象成为目前的趋势。磷也是重要的生命元素,磷酸盐的富集与生物演化之间也存在一定的联系。新元古代末—寒武纪磷块岩沉积是第1次全球性大规模成磷事件,它与Rodinia超大陆解体、新元古代晚期冰川事件的结束、古海洋水体地球化学条件的变化及新旧生态系统更迭等因素有关,而成磷事件又对这一时期的生物演化与生命创新事件起到了促进作用。对磷块岩的成因理论、古海洋磷循环等进行了分析,并从新元古代末—寒武纪磷块岩沉积的时空分布和成磷事件对生物演化的影响方面进行了探讨。  相似文献   

应用双特异分子探针技术定性定量检测圆海链藻(Thalassiosira rotula)     

李秀芹  于志刚  甄毓  蔡青松  米铁柱  李荣秀 《海洋与湖沼》2009,40(1):12-18

设计了一套圆海链藻(Thalassiosira rotula)特异性探针,运用双特异分子探针技术,对圆海链藻(Thalassiosira rotula)进行了定性定量检测.结果表明,本实验中设计的一套探针与其它十几种藻无交叉反应,具有种特异性;细胞裂解液直接杂交检测优于提纯RNA样品检测;对自然样品做了初步检测,发现天然海水中的其它浮游生物对该检测方法影响很小.  相似文献   

长江口及毗邻海区沉积物中磷的分布特征   总被引：6，自引：2，他引：4  

何会军  于志刚  姚庆祯  陈洪涛  米铁柱 《海洋学报》2009,31(5):19-30

于2006年6月和2007年4月在长江口及毗邻海区采集了表层沉积物样品,利用水淘选法对沉积物进行了粒径分级,并采用改进后的SEDEX方法对沉积物样品及分粒级沉积物样品进行了磷形态分析。结果表明,2006年6月和2007年4月长江口及毗邻海区沉积物总磷变化分别为12.56~19.64μmol/g和8.99~19.91μmol/g,其中碎屑磷是磷的主要存在形态。可交换态磷、铁结合态磷、有机磷、自生磷灰石磷及难分解有机磷在长江口外的平面分布比较一致,均在紧邻长江口门外、杭州湾外的条状带出现了含量的高值,而在口门内及口门外河口靠海一侧碎屑磷含量较高。不同形态磷在不同粒径沉积物中的含量不尽相同:有机磷、自生磷灰石磷以及难分解有机磷是小于8μm粒级沉积物中磷的主要组成部分,而且其在总磷中所占比例随沉积物粒径的增加而下降;碎屑磷则主要集中在粗沉积物中,为32~63μm及大于63μm粒级沉积物中磷的主要贡献者。沉积物的粒度分异以及各形态磷在不同粒径沉积物中含量的差异,共同影响着河口沉积物中磷的分布。  相似文献   

Detection of Prorocentrum donghaiense using sandwich hybridization integrated with nuclease protection assay   总被引：1，自引：0，他引：1  

CHEN Jie  ZHEN Yu  MI Tiezhu  YU Zhigang 《海洋学报(英文版)》2009,28(2):121-126

Prorocentrum donghaiense is an important harmful algae bloom (HAB) causing creature in China’s seas, and the conventional visual detection can not cope with long-term monitoring and high-throughput sampling projects. An assay for P. donghaiense with sandwich hybridization integrated with nuclease protection assay (NPA-SH) was established. Tests with mixed samples and spiked field ones confirmed its good specificity and sensitivity. The cell number of P. donghaiense correlated well with the optical density, ...  相似文献   

长江口及毗邻海区沉积物中磷的分布特征长江口及毗邻海区沉积物中磷的分布特征     

何会军  于志刚  姚庆祯  陈洪涛  米铁柱 《海洋学报(英文版)》2009,28(5)

于2006年6月和2007年4月在长江口及毗邻海区采集了表层沉积物样品,利用水淘选法对沉积物进行了粒径分级,并采用改进后的SEDEX方法对沉积物样品及分粒级沉积物样品进行了磷形态分析。结果表明,2006年6月和2007年4月长江口及毗邻海区沉积物总磷变化分别为1256~1964 μmol/g和899~1991 μmol/g,其中碎屑磷是磷的主要存在形态。可交换态磷、铁结合态磷、有机磷、自生磷灰石磷及难分解有机磷在长江口外的平面分布比较一致,均在紧邻长江口门外、杭州湾外的条状带出现了含量的高值,而在口门内及口门外河口靠海一侧碎屑磷含量较高。不同形态磷在不同粒径沉积物中的含量不尽相同：有机磷、自生磷灰石磷以及难分解有机磷是小于8 μm粒级沉积物中磷的主要组成部分,而且其在总磷中所占比例随沉积物粒径的增加而下降;碎屑磷则主要集中在粗沉积物中,为32~63 μm及大于63 μm粒级沉积物中磷的主要贡献者。沉积物的粒度分异以及各形态磷在不同粒径沉积物中含量的差异,共同影响着河口沉积物中磷的分布  相似文献   

Behavior of different phosphorus species in suspended particulate matter in the Changjiang estuary   总被引：1，自引：0，他引：1  

何会军  陈洪涛  姚庆祯  秦延文  米铁柱  于志刚 《中国海洋湖沼学报》2009,27(4):859-868

Suspended particulate matter (SPM) collected in the Changjiang (Yangtze River) estuary in June 2006 was separated into five fractions via water elutriation: clay-very fine silt (<8 μm), fine silt (8–16 μm), medium silt (16–32 μm), coarse silt (32-63 μm) and sand (>63 μm). The SPM and fractionated particles were sequentially analyzed by a modified SEDEX sequential extraction method to obtain six species of phosphorus: exchangeable or loosely-sorbed P, organic P, Fe-bound P, authigenic P, detrital P and refractory P. The results indicated that all particulate phosphorus species except for detrital P were negatively correlated to particle size; a high detrital P content was found in coarse silt and very coarse silt. From the inside of the river mouth to the gate of the river mouth, organic P, Fe-bound P and refractory P in the suspended particles decreased and a higher amount of exchangeable P appeared around the gate of the river mouth. From the gate of the river mouth to the sea, exchangeable P and organic P in suspended particles increased distinctly. The total particulate P flux into the estuary from the Changjiang River was about 45.45×10⁸ μmol/s during sampling. Of this, about 8.27×10⁸ μmol/s was associated with the “truly suspended” fraction. The bio-available particulate P flux was about 13.58×10⁸ μmol/s. Of this, about 4.24×10⁸ μmol/s was transported by “truly suspended” particles.  相似文献   

赤潮藻鉴定与定量检测方法进展   总被引：2，自引：0，他引：2  

于志刚  米铁柱  姚鹏  甄毓 《中国海洋大学学报(自然科学版)》2009,39(5)

从基于形态学差异的图像识别技术、基于核酸分析的检测方法、基于免疫分析的检测方法、基于特征色素的方法和基于光学特性的方法5个方面,比较系统地回顾了有关赤潮藻定性鉴定和定量检测技术的发展,并就存在的问题和发展趋势作了简要分析。  相似文献   

测井约束反演技术在老河口油田老163井区的应用     

滕宝刚  米乃哲  邓涛  徐永  刘明 《地球科学与环境学报》2008,30(4)

针对老河口油田老163井区新近系河流相油气藏储层纵横向变化大、油气聚集复杂、常规地震解释精度低的问题,利用Jason测井约束反演技术对该地区馆上段储层进行了地震处理及砂体描述。通过地震资料反演前预处理、测井资料标准化校正、合成记录标定层位,GOCAD建模弥补Jason建立初始模型功能的不足,提高了该地区地震解释的精度。结果显示,反演可以识别3～6m的储集层,解决了砂体薄互层识别难的问题,获得了比较好的勘探及开发效果。  相似文献   

The Biomarkers in the Mesoproterozoic Organic-rich Rocks of North China Craton: Implication for the Precursor and Preservation of Organism in the Prokaryotic Realm     

MA Sihong  ZHANG Shuichang  SU Jin  WANG Xiaomei  HE Kun  FANG Yu  MI Jingkui 《《地质学报》英文版》2022,96(1):293-308

Mesoproterozoic marine organic-rich rocks are widely distributed in the North China Craton,include the Gaoyuzhuang(GYZ),the Hongshuizhuang(HSZ),and the Xiamaling(XML)formations.According to the T;value and isomerisation ratio of C;homohopanes,the XML,HSZ,and GYZ samples were in low mature,mature and high mature stage,respectively.Biomarker distribution in extractable organic matter(EOM)of three Mesoproterozoic organic-rock samples in different maturity were analysed to reveal the organic precursor and preservation pathway of in the Mesoproterozoic Combined with gold-tube pyrolysates of three Mesoproterozoic samples,it could further illuminate the chemical composition of Mesoproterozoic kerogen,given excluding.The results indicated that the three formations were all deposited under reducing condition and their organic precursors mainly were some aquatic organisms.High content of rearranged hopanes was detected in EOM of XML and HSZ samples,whereas they were relatively low in the high mature GYZ sample.Contrast to that in EOM,the relative concentration of rearranged hopanes sharply decreased in the gold-tube pyrolysates of the XML kerogen,then slightly increased but was still significantly lower than the EOM of XML sample,which indicated that catalysis of clay minerals in the early diagenesis only changed the chemical composition of the unstable functional groups of the kerogen during the preservation.Due to the thriving heterotrophic microbes and low sink rate of particulate organic matter during the Mesoproterozoic,primary producers suffered extensive degradation during sinking process,only some resistant biopolymers lacking of lipid compounds survived from heterotrophic degradation,while heterotrophic microbes contained more proportion of organic precursors.Abundant pristane(Pr)and phytane(Ph)were only released in high mature stage because of the protection of the macromolecular structure of resistant biopolymers which prevented biomarkers from being altered by the thermal stress.The absence of 13α(n-alkyl)-tricyclic terpanes in the high matured hydrocarbon products also indicated the different precursors between different parts of Mesoproterozoic kerogen.The evolution of the biomarker composition and content of Mesoproterozoic kerogen showed some special characteristics differing from those of Phanerozoic kerogen.The total concentrations of hopanes displayed with an order of low mature stage>high mature stage>mature stage.Relative content of rearranged hopanes in the hydrocarbon generated in high mature stage was significantly lower than that in the low maturity stage.The ratios of Pr/n-C₁₇ and Ph/n-C₁₈ increased with thermal maturity,and the ratio of nC_21-/nC₂₂₊ decreased in the high maturity stage,thus displaying another order of mature stage>high maturity stage>low maturity stage.The unique preservation pathway of Mesoproterozoic organisms was attributed to the special evolution characteristics of biomarker distributions,which should be considered in the Mesoproterozoic marine environment and biological studies.  相似文献   

亚洲热带夏季风指数与中国南方降水的关系     

任菊章  琚建华  米瑞芝  段长春  陶云 《气象科学》2021,41(2):228-236

利用1979-2013年夏季全球2.5°×2.5°逐日环流资料和中国气象站点降水观测资料,采用动力学因子(西南风)与热力学因子(Radiation Longwave covting,OLR)相结合定义了标准化的亚洲热带夏季风指数(Tropical Summer Monsoon Index,TSMI).结果 表明,该指数...  相似文献