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Distribution of molluscan remains in the sediment of the Chukchi Sea and its vicinity, the Arctic

Acta Oceanologica Sinica 2003年第4期22卷 607-619页

作者： Gao Aiguo 1,2. Xu Fengshan3, Sun Haiqing 1,2. Li Lon1 1. first institute of Oceanography,{2., qingdao 2.6061.china. 2. key laboratory of marine sedimentology and environmental Geology,{2., qingdao 2.6061.china 3. institute of Oceanology, Chinese Academy of Sciences, qingdao 2.6071,china state Ocean Adm Inst Oceanog 1 Qingdao 266061 Peoples R China state Ocean Adm Key Lab Marine Sedimentol & Environm Geol Qingdao 266061 Peoples R China Chinese Acad Sci Inst Oceanol Qingdao 266071 Peoples R China

The result of an analysis of mollusca remains collected from the Chukchi Sea, Beaufort Sea and Bering Sea in the first Chinese National Arctic Research Expedition, from July to September, 1999 is presented. Seventeen species of mollusca have been identified, which belong to two classes: Bivalvia and Gastropoda. The compositions of the mollusca are very simple. According to the distribution pattern two groups may be distinguished among molluscan species. The Pan-Arctic and circumboreal group comprises Nuculana pernula, ***, Nucula bellotii, Astarte montagui, Seripes groenlandicus, Macoma calcarea, M. moesta alaskana, Liocyrna fluctuosa, Mya pseudoarenaria and Turritella polaris. Three species, Cyclocardia crebricostata, Trichotrois coronata and Argobuccinum oregonense are components of the Pan-Arctic and Pacific boreal group. With regard to feeding habits, detritus feeders dominate. There are 7 species of detritus feeders, i.e., Nuculana pernula, N. radiata, Nucula bellotii, Macoma calcarea, M. moesta alaskana, Macoma sp. and Trichotropis coronata. Detritus feeders are dominant with regard to the numbers of species as well as to the frequency of occurrence. Macoma calcarea is the most abundant species.

关键词： Chukchi Sea Beaufort Sea Bering Sea molluscan remains

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Nd isotope as the tracer of seawater evolution of early Miocene in the eastern Pacific Ocean

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Chinese Science Bulletin 2003年第B06期48卷 106-110页

作者： LIU Jihua~(1,2.3), CHEN Lirong~1, WANG Yingxi~4.& HAN Jianxiu~5 1. institute of Oceanology, Chinese Acadcmy of ences, qingdao 2.6071. {2. 2. key lab of marine sedimentology and environmental Geology, first institute of oceanograpgy, state oceanic administration, qingdao 2.6061. china 3. Graduate School, Chinese Academy of Sciences, Beijing 100039. {2. 4. Modern Analysis Center, Nanjing University. Nanjing 2.0093. {2. 5. Guangzhou marine Investigation Bureau, Guangzhou 510760. {2. 1. institute of Oceanology Chinese Academy of Sciences 266071 Qingdao China 2. key lab of {2. {4. and environmental Geology First Institute of Oceanograpgy State Oceanic Administration 266061 Qingdao China 3. Graduate School Chinese Academy of Sciences 100039 Beijing China 4. Modern Analysis Center Nanjing University 210093 Nanjing China 5. Guangzhou marine Investigation Bureau 510760 Guangzhou China

Fifty-six samples of nannofossil ooze were collected from Core PC5794.in the northern equatorial Pacific at 5 cm intervals. With the methods of mass spectrometer (VG354. and ICP, the Nd isotopic compositions (εNd(t)), Mn contents and Mg/Sr ratios of carbonate phase have been analyzed. CaCO3 contents of bulk sediments were obtained by dissolution of 0.5 mol/L HCl. Based on these data, the high-resolution εNd(t) profile of seawater in early Miocene with core depth(or time) have been established. The values of εNd(t) range from -6.2.to -2.97 and 4.fluctuation cycles existed during 2..06-2..02.Ma. 4.low εNd(t) values (about -6.4. correspond to high CaCO3 contents, which implicates that there were 4.cold epochs or 4.times of Antarctic Bottom Water activity. They occurred at the time of 2..06 Ma, 2..85 Ma,2..88 Ma and 2..2. Ma, respectively. High εNd(t) values correspond to the high Mn contents and high values of Mg/Sr ratio, which indicates the existence of 4.intense hydrothermal activity periods during 2..06-2. Ma, the durations of them are 4.05-2..98 Ma, 2..69-2..15 Ma, 2..74.2..37 Ma and 2..06-2..02.Ma, respectively.

关键词：同位素钕示踪原子海水演化中新世太平洋微化石分光计持续期海水样品

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