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柴达木盆地盐湖有孔虫的发现及其地质意义 被引量:23
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作者 孙镇城 曾学鲁 +2 位作者 陈克造 王蓓 李瑜 《石油学报》 EI CAS CSCD 北大核心 1992年第2期252-257,共6页
青海省柴达木盆地小柴旦盐湖第四纪晚期沉积内发现海相世系的有孔虫化石希望虫Elphidium sp.,而且与典型盐湖介形类肥胖真星介Eucypris inflata共生,这是罕见的发现。该湖海拔3172m,距最近的海1700km,迄今为止,是地球上发现有孔虫距海... 青海省柴达木盆地小柴旦盐湖第四纪晚期沉积内发现海相世系的有孔虫化石希望虫Elphidium sp.,而且与典型盐湖介形类肥胖真星介Eucypris inflata共生,这是罕见的发现。该湖海拔3172m,距最近的海1700km,迄今为止,是地球上发现有孔虫距海遥远且海拔最高的盐湖。根据柴达木盆地地理和沉积、生物演化史分析,难以用海侵或残留海观点解说该有孔虫的来源。这一发现说明内陆盐湖存在少量海相世系生物是个事实。论文讨论了空中通道是一个可能的生物传布途径。将今论古,如果在含盐岩系中出现少量广盐性有孔虫或其他海相世系生物化石,需要作具体分析,不一定全都是海侵或残留海的证据。 展开更多
关键词 有孔虫目 盆地 盐湖相 古地理环境
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河套盆地第三系有孔虫的发现及其生态环境的分析 被引量:11
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作者 袁效奇 傅智雁 耿国仓 《石油学报》 EI CAS CSCD 北大核心 1992年第2期109-115,共7页
位于太行山隆起以西的河套盆地临和坳陷陆相第三系中发现有孔虫Discorbis,Ammonia和Miliolidae,产出层位为渐新统中、上部和中新统中、上部,与其共生的化石有陆相介形类Cyprinotus和Cyprideis。对有孔虫产出层段进行的微量元素及碳、氧... 位于太行山隆起以西的河套盆地临和坳陷陆相第三系中发现有孔虫Discorbis,Ammonia和Miliolidae,产出层位为渐新统中、上部和中新统中、上部,与其共生的化石有陆相介形类Cyprinotus和Cyprideis。对有孔虫产出层段进行的微量元素及碳、氧同位素分析结果显示了互相矛盾的数据,难以确切判定其为海相或陆相沉积,但从临河坳陷被阴山山脉、乌拉山、伊盟隆起环绕这一特殊地质、地形条件来看,这些有孔虫不可能是海浸的产物,而应是湖盆内含盐度增高的水介质中生存的特殊陆相生物。 展开更多
关键词 第三系 有孔虫目 沉积环境
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Evolution of the Southern Yellow Sea Cold Water Mass during the last 7 kyr from benthic foraminiferal evidence
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作者 Fuchang ZHONG Rong XIANG +1 位作者 Yiping YANG Meixun ZHAO 《Science China Earth Sciences》 SCIE EI CAS CSCD 2018年第10期1406-1418,共13页
The Southern Yellow Sea Cold Water Mass(YSCWM) is closely related to the modern circulation system of the east China shelf seas, which has significantly influenced regional marine environmental changes. The study of t... The Southern Yellow Sea Cold Water Mass(YSCWM) is closely related to the modern circulation system of the east China shelf seas, which has significantly influenced regional marine environmental changes. The study of the Holocene evolution of the YSCWM will greatly improve our understanding of the mechanisms of regional environmental change. Benthic foraminifera are sensitive to bottom water environmental changes and can serve as useful indicators in bottom water environmental reconstruction. In this study, benthic foraminifera were analyzed in core N02 from the northwestern margin of the southern Yellow Sea Mud to decipher the phase evolution of the YSCWM during the last 7 kyr. Benthic foraminifera census counts and Q-mode factor analysis indicate that the Holocene sedimentary environment can be divided into three stages: From6.9–5.0 ka, the fauna was dominated by Ammonia ketienziensis, indicating that the YSCWM was at its strongest during the last 7 kyr, while the Yellow Sea Coastal Current(YSCC) had a weak influence on the bottom water of the study area. From 5.0–2.9 ka,the relative abundance of Hanzawaia nipponica remarkably increased while the abundance of A. ketienziensis decreased significantly, reflecting that the strength of the YSCWM was relatively weak and the range of the YSCWM might have contracted. The influence of the YSCC on the bottom water might have slightly increased, although its influence was still weak during this time. A notable increase in low-temperature and low-salinity species, such as Protelphidium tuberculatum and Buccella spp. has occurred since 2.9 ka, indicating that the YSCC has had a strong influence on bottom water during this period,while the strength of the YSCWM has been at its weakest during the last 7 kyr. Generally, the influence of the YSCWM and the YSCC on the bottom water properties of the study area show an obvious seesaw pattern, with one's influence increasing while the other's influence decreases and vice versa. The fluctuations in the strength of YSCWM during the Holocene may be caused by the different effect allocations of regional climatic factors(i.e. El Ni?o Southern Oscillation, East Asian Winter Monsoon,summer insolation in the northern hemisphere, etc.) acting on the circulation system during different periods. 展开更多
关键词 Benthic foraminifera Yellow Sea Cold Water Mass HOLOCENE El Nifio Southern Oscillation East Asian Winter Monsoon
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