渤海湾西北岸的几道牡蛎礁  

Several Oyster Barrier Reefs in the Northwest Coast of Bohai Sea

作　　者：岳军[1,2,4] DONG Yue 张宝华 韩芳[1,4] 赵希涛[5] 刘冬雁[6] 段焕春 张百鸣[7] 赵长荣[2] 

机构地区：[1]天津市海洋地质勘查中心,天津300170 [2]国土资源部天津地质矿产研究所,天津300170 [3]University of Texas at San Antonio (Texas 78249-1644 USA) [4]天津华北地质勘查局地质研究所,天津300170 [5]中国科学院地质与地球物理研究所,北京100029 [6]中国海洋大学,山东青岛266100 [7]天津市地质矿产勘查开发局,天津300191

出　　处：《地质学报》2012年第8期1175-1187,共13页Acta Geologica Sinica

基　　金：国家自然基金项目(编号40940025),国家自然科学基金项目(编号41006002)资助的成果;天津市自然基金项目(编号07ZCGYSF02400、09JCYBJC07400);国家973项目(编号2007CB411807);国家海洋局海洋大气-化学与全球变化重点实验室开放基金项目(编号GCMAC0806)

摘　　要：渤海湾西北岸划分出了第Ⅰ道—第Ⅵ道牡蛎礁的平面分布(图1);对牡蛎礁壳体的几何形态特征进行了描述(图2),并将牡蛎礁壳体进行了剖面切割(图3);对牡蛎礁壳体进行了X光衍射与激光拉曼(活—古)矿物晶型的对比分析(表1,图4);对俵口村BKP20-2剖面(-2.84m)牡蛎礁一个体右壳:在双目镜下对其内部结构与矿物组分进行了分析(图5);通过机械挖掘剖面及钻探获得:牡蛎礁体的空间堆积厚度与赋存的海拔高度及其各剖面垂直方向上的14C年代数据;并获得牡蛎礁体堆积的内部结构特征(图6);以及牡蛎礁体水平夹层与CaCO3含量变化(图7),其中水平夹层CaCO3含量往往偏高,初步分析可能与气候偏冷有关。对牡蛎礁壳体内充填物及壳外沉积物进行了粒度分析(表3),粒度组分及概率累积曲线等(图9)为分析牡蛎礁的生态环境提供了佐证:即牡蛎礁基本以潮下带生活环境为主。以俵口BKP20剖面为例分析了牡蛎礁体堆积物从埋深-2.14～-6.90m的生物组合特征(表4)。以上资料为获得牡蛎礁堆积体的生长-发育-消亡等演化模式提供了依据(图10)。The northwest coast of Bohai Sea can be horizontally classified into six oyster barrier reefs. Based on thedescription of geometrical morphology characteristics and dissected profiles for oyster barrier reefs＇ bodies, the study carried out comparative analysis for mineral crystal forms of oyster barrier reefs bodies using X-ray diffraction and Laser Raman. The internal structure and mineral components of individual oyster shell from the BKP20-2 profile in Biaokou county was investigated under binocular microscope. Through mechanical excavation and drilling, the author obtained the thickness of spatial accumulation and occurrence elevation of oyster barrier reef bodies, and 14C age data for each profile in the vertical direction, the internal structure of the oyster reef accumulation, and horizontal intercalation and content change of CaCOa. But the content of CaCOa is often higher, and preliminary analysis show it may e related to cold weather. Grain sizes were analyzed based on the fillings inside oyster shell and sediments on shell. Grain size components and probability cumulative curve provide evidence for the ecological environment of the oyster barrier reefs. The living environment of oyster barrier reefs is mainly in the subtidal zone. The BKP20 profile at Biaokou county was employed to investigate the biological assemblages characteristics of oyster reef at depth from --2. 14 to --6.90 m. The results above provide the basis for obtaining the evolution model of growth, development and extinction of the oyster barrier reefs＇ bodies.

关 键 词：渤海湾西北岸 牡蛎礁的分布 牡蛎礁的生态与演化 

分 类 号：P736[天文地球—海洋地质]