| 渤海湾西北岸大吴庄牡蛎礁测年与古环境变化 |
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| 引用本文： | 范昌福,李建芬,王宏,阎玉忠,王福,裴艳东,商志文.渤海湾西北岸大吴庄牡蛎礁测年与古环境变化[J].地质调查与研究,2005,28(2):124-129. |
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| 作者姓名： | 范昌福 李建芬 王宏 阎玉忠 王福 裴艳东 商志文 |
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| 作者单位： | 1. 天津地质矿产研究所,天津,300170
2. 天津地质矿产研究所,天津,300170;吉林大学地球科学学院,长春,130061 |
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| 基金项目： | 中国地质调查局“环渤海地区地下水资源与环境地质综合研究”项目(20012400002)，天津市科委“天津沿海地区近现代重大地质环境演变及对策”项目(043112711) |
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| 摘 要： | 对位于渤海湾牡蛎礁平原东部的大吴庄牡蛎礁一个完整剖面的系统^14C年代测定与校正表明，该礁体的持续时间约为1600年(7200～5600calBP)。以壳体生长纹层氧、碳同位素获得的礁体平均建造速率1cm／yr来计算礁体的持续时间，结果仅为^14C计年历时的三分之一。^14C测年与壳体同位素计年结果的对比表明，礁体的每一水平层平均占据了一定的时间(约200年)，这一时间段是不适宜礁体正常建造的“缓变型地质环境恶化期”。礁体正常建礁层及水平夹层的时空分布与地区性气候变化曲线对比结果表明，水平夹层与正常建礁层的转换与地区性气温波动相对应。水平夹层代表的“缓变型地质环境恶化期”，对应着地区性气温偏冷时期。
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| 关 键 词： | 牡蛎礁 年代测定 地质环境变化 渤海湾西北岸 |
| 文章编号： | 1672-4135(2005)02-0124-06 |
| 修稿时间： | 2005年6月6日 |
Age and Paleoenvironmental Change of Dawuzhuang Oyster Reef on the Northwest Coast of Bohai Bay |
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| FAN Chang-fu,LI Jian-fen,WANG Hong,YAN Yu-zhong,WANG Fu,PEI Yan-dong,SHANG Zhi-wen.Age and Paleoenvironmental Change of Dawuzhuang Oyster Reef on the Northwest Coast of Bohai Bay[J].Geological Survey and Research,2005,28(2):124-129. |
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| Authors: | FAN Chang-fu LI Jian-fen WANG Hong YAN Yu-zhong WANG Fu PEI Yan-dong SHANG Zhi-wen |
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| Institution: | FAN Chang-fu1,LI Jian-fen1,WANG Hong1,YAN Yu-zhong1,WANG Fu 1,2,PEI Yan-dong1,SHANG Zhi-wen 1,2 |
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| Abstract: | The results of radiocarbon dating of the fifteen shells in the section 1 of Dawuzhaung Oyster Reef, which is located in the Northwest Coast of Bohai Bay, show that the duration of this reef is about 1 600 yrs (from ca. 7 200-5 600 cal BP). The whole thick of this reef is about 6 m. And if we calculate with the mean building-up rate of 1 cm/yr to this oyster reef, which is based on both the analysis to stable isotopes of the live and fossil oyster shells and count to the amount of concave up and concave down ridges on the hinge, the duration of it is only one third of the results given by radiocarbon dating. The difference between the two is attributed to the horizontal layers in the oyster reef. Each horizontal layer lasts a relative long period of ca. 200 yrs, which is not suitable for oyster growing and its reef buildinng-up. And we name this as chronic geo-environmental change recorded in the oyster reef during the middle Holocene in Northwest Coast of Bohai Bay, China. Comparing between the time-space of horizental layers and normal layers in the Dawuzhuang reef body with the local paleoenivronmental curve inferred from the peat cellulose and ice core has shown that the interchanges of horizental with normal layers match the flunctuations of the regional paleoenvironment changes. The normal layers represent the warmer periods and the horizontal layers were for the cooler periods during the Middle Holocene. |
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| Keywords: | oyster reef radiocarbon dating paleoenvironmental change Northwest Coast of Bohai Bay |
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