南黄海北部深水区表层沉积中有孔虫和介形虫的分布

南黄海北部深水区 (36°15 ～ 38°0 0 N、12 3°2 0 ～ 12 4°33 E)表层沉积中的有孔虫和介形虫主要由原地分子和残留分子组成。残留分子为陆相介形虫、沿岸浅水有孔虫和介形虫 ,反映了末次冰期低海面和冰后期海侵初期的沉积环境 ,原地分子以冷水和深水种为特征 ,介形虫以 Sarsicytheridea bradii、Acanthocythereis mutsuensis和Munseyella japonica等为优势种。有孔虫有两个组合 :东北部为以 Proteonina atlantica为代表的胶结质壳组合 ;西南部为玻璃质壳组合 ,其优势成分是 Buccella frigida、Protelphidium tuberculatum、Ammonia ketienziensis、H anza-waia mantaensis和 Pacinonion tasmanensis等。调查区埋葬群存在原地和叠加两种类型 ,前者分布在北部和南部 ,后者主要见于中部和西部     

山东莱芜盆地新近纪山旺组的发现及意义

最近在莱芜盆地新发现了山旺组,它的特征与临朐一带的山旺组相似,也是由粘土岩、页岩与玄武岩组成,并含有丰富的鱼类、蜻蜓、介形类、鳖类及植物化石,是"山旺化石"的重要补充.这一发现,说明新近纪早期,在鲁西除山旺地区之外,其他的新生代盆地中也可能有同时代地层沉积.该套地层中所赋存的相关资源的调查应引起地质工作者的高度重视.     

The ostracod assemblages and their environmental significance in the Chen Co area, southern Tibet in recent 1400 years

The CC1 core, with a length of 216 cm, was drilled in the west part of the Chen Co (Lake) in southern Tibet Plateau. The 210Pb and 137Cs measurement indicated that it was a consecutive sedimentary sequence since ca. 1400 years. The ostracoda and their assemblages under the level of 1 cm samples' cutting interval were finished for this core to reveal the past environmental changes in the lake area. A total of 15 species of ostracods belonging to 7 genera in the core sediments had been identified. According to the ostracod distributions, abundances and preservations in the core, seven ostracod assemblages had been distinguished. The ostracod assemblages and their ecological features, together with the sediments dating decision were used to infer the past ca. 1400 years environmental changes of the Chen Co environmental evolutions in three stages, which had responded to the Medieval Ages Warm-period (MAW), the Little Ice Age (LIA) and modern warm period. The results show that the changes of the Chen Co environment had been mainly influenced by the climatic variations. The trend of the lake level fluctuations had been accorded with that of climatic variation during the past 1400 years.     

The response of benthic foraminifera and ostracoda to heavy metal pollution in Gulf of Izmir (Eastern Aegean Sea)

Benthic foraminifera can be used as environmental bioindicators, especially in polluted environments where their sensitivity to pollutants may be expressed by a modification in the assemblage. Nineteen sediment samples were collected in November 2002 from surficial sediments of the Gulf of Izmir (Turkey). The Gulf of Izmir is located in Western Turkey and surrounded by a densely populated community. The gulf has been contaminated by numerous heavy metals, but geochemical analyses have shown that metals are significant pollutants only in the inner part of the gulf. Outer and Middle Sections showed low levels of heavy metals, except the estuary of Gediz River. Eight heavy metals have been analyzed in all the sampling points. Sixty-seven foraminifer and 22 ostracod species were identified in 16 sediment samples. Statistical analysis shows that there is a significant correlation between foraminifera species and heavy metals. The most polluted Inner Sections are dominated by the tolerant species Ammonia tepida that may be used as pollution indicator. The gradient observed in heavy metal concentrations between the Outer and Inner Sections has a prevalent influence on the foraminiferal distribution. There is a gradient of the number of species, increasing from the Inner Section toward the Outer Section. The occurrence of test abnormalities among foraminifera may represent a useful biomarker for evaluating long-term environmental impacts in a coastal region.     

中国近海浮游介形类大尺度生态研究Ⅰ.浮游介形类的丰度及其变动规律

以中国近海为一研究单元,从总体水平上分析浮游介形类的数量变动规律,阐述不同季节个体密度的差异并进行地理上的比较.此外,揭示了浮游介形类平面分布的特点,指出除汕头邻近水域外,其余沿岸区为丰度贫乏区,200m等深线以深海域为低量值的均匀分布区,50～200m等深线之间海域的数量明显增加,同时表明中国近海终年存在3个数量密集区.     

南极长城湾NG931柱全新世介形类及其环境分析

本文材料系南极长城湾ＮＧ９３１柱状样品分析的介形类。共计１１属２１种，其中以Ｌｏｘ－ｏｒｅｔｉｃｕｌａｔｕｍｆａｌａｘ为占最优势组成分子，其次，Ｘｅｓｔｏｌｅｂｅｒｉｓｋｅｒｇｕｅｌｅｎｅｎｓｉｓ，Ｘｅｓｔｏｌｅｂｅｒｉｓｓｐｐ．，Ｓｅｍｉｃｙｔｈｅｒｕｒａｓｐｐ．和Ａｕｓｔｒａｌｉｃｙｔｈｅｒｅｐｏｌｙｌｙｃａ等也为该柱样中介形类的主要组成分子。根据资料分析，ＮＧ９３１柱样中介形类属种绝大部分为南极地区所出现的介形类动物群中的已知类型，它们之间有一定的相似性，推测其生境也有可能相近似。从介形类属种组成上看，应属滨岸－浅海的沉积环境     

江苏兴化ZK10孔第四纪多重地层研究

通过对江苏兴化ZK10孔岩石地层、生物地层、磁性地层及年代地层的研究,确定了该孔第四纪年代地层序列:1第四纪底界置于松山/高斯极性世分界处,埋深212m,距今2.58Ma。下更新统包括五队镇组下段、中段及上段的中下部,对应孢粉组合Ⅰ-1和Ⅰ-2。2早、中更新世界线与布容/松山极性世界线吻合,距今0.78Ma,埋深约120m,位于孢粉Ⅰ-2与Ⅱ带的分界处。中更新统包括五队镇组上段顶部、小腰庄组下段及上段的中下部。五队镇组是包含下、中更新统的跨时岩石地层单位。3中、晚更新世界线埋深81.5m,120ka BP左右,置于孢粉带Ⅱ与Ⅲ-1的分界处,与小腰庄组和灌南组分界线基本吻合。上更新统包括小腰庄组上段上部及灌南组。小腰庄组是包含中、上更新统的跨时地层单位。上更新统包括Ⅲ-1、Ⅲ-2、Ⅳ和Ⅴ孢粉带。4晚更新世与全新世界线埋深12.25m,距今10ka BP左右,位于Ⅴ与Ⅵ孢粉带分界处。全新统为淤尖组,对应孢粉Ⅵ带。     

The ostracod assemblages and their environmental significance in the Chen Co area,southern Tibet in recent 1400 years

The CC1 core, with a length of 216 cm, was drilled in the west part of the Chen Co (Lake) in southern Tibet Plateau. The²¹⁰Pb and¹³⁷Cs measurement indicated that it was a consecutive sedimentary sequence since ca. 1400 years. The ostracoda and their assemblages under the level of 1 cm samples’ cutting interval were finished for this core to reveal the past environmental changes in the lake area. A total of 15 species of ostracods belonging to 7 genera in the core sediments had been identified. According to the ostracod distributions, abundances and preservations in the core, seven ostracod assemblages had been distinguished. The ostracod assemblages and their ecological features, together with the sediments dating decision were used to infer the past ca. 1400 years environmental changes of the Chen Co environmental evolutions in three stages, which had responded to the Medieval Ages Warm-period (MAW), the Little Ice Age (LIA) and modern warm period. The results show that the changes of the Chen Co environment had been mainly influenced by the climatic variations. The trend of the lake level fluctuations had been accorded with that of climatic variation during the past 1400 years.     

东营凹陷生油岩中介形虫氧、碳同位素的古湖泊学意义

对山东东营凹陷沙河街组一段27个生油岩样品中的介形虫进行了氧，碳同位素分析，其δ（^18O)全为负值，δ(^13O)多为正值，两者之间有明显的相关性，相关系数（r)为0．92，同时，δ（^18O)与δ（^13O)垂向变化明显，沙一段下，中亚段明显高于上亚段，通过与现代湖泊碳酸盐氧，碳同位素特征的比较得出：沙一段生油岩沉积时期的古湖泊是一封闭咸水或半咸水湖泊，中，下亚段沉积时期，气候干燥，蒸发作用强烈，湖水面较低，盐度高，生产力高，而上亚段沉积时期，气候较湿润，降雨量大，湖水面高，盐度偏低，生产力降低。     

吉林蛟河盆地下白垩统大拉子组介形虫化石组合特征

蛟河盆地内广泛出露下白垩统大拉子组, 并在保家村附近产出介形虫、叶肢介和植物碎片等化石. 通过1:2 000地质剖面实测中分层采集化石, 在保家村北侧剖面的大拉子组中获得介形虫5属9种, 其中包括1个相似种和6个未定种, 分别是: Cypridea paracavernosa, C. concinaformis, C. sp., Candoniella cf. candida, Candoniella sp., Scabriculocypris sp., Mongolianella sp., Candona sp. 1和Candona sp. 2. 结合前人的化石发现, 建立了Cypridea paracavernosa-C. concinaformis组合, 该介形虫组合可以与吉林延边大拉子组介形虫进行对比, 时代可能为早白垩世晚期.