中-晚更新世印度洋赤道地区的古海洋学资料

来源 :海洋地质译丛 | 被引量 : 0次 | 上传用户:ALFU
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
尽管近十年来获得了大量有关第四纪,特别是晚更新世古海洋复原的资料,但印度洋近赤道地区仍然是研究程度相当低的。关于该海区表层水的变化存在着两种可供选择的观点:(1)在末次冰期极盛期和最佳间冰期,水温接近现代;(2)在寒冷期水温明显低于间冰期和全新世。有关印度洋北部溶解旋回与气候变化的相互关系问题也不够清楚。已具备有关温暖时期和寒冷初期溶解作用增强的资料(Peterson等,1985);在某些情况下很难进行这种相应的对比(如,1988年提出的K—28井岩心)。有关底层环境变化的资料亦很少。对解决古海洋学任务来说很重要的有关印度洋中玫瑰色Globigerinoides (Gs.)ruber d'or-bigny层位消失问题仍然有争议。所有这些不清楚之处首先与很难从印度洋近赤道地区深海部分获得良好的碳酸盐沉积物连续剖面有关,这种难度是有孔虫溶跃面的位置相对不深以及再 Although there has been a great deal of information on the Quaternary, especially the late Pleistocene, the recovery of the paleo-ocean over the past decade, the degree of research in the Indian Ocean near the equator is still relatively low. There are two alternative views on the variation of surface water in the sea area: (1) the water temperature is close to the modern during the last ice age and the best interglacial period; (2) the water temperature in the cold period is obviously lower than the interglacial period and the new world. The issue of the interrelationship between dissolved cycles and climate change in the northern Indian Ocean is not clear enough. Information on enhanced dissolution during warm and cold periods is already available (Peterson et al., 1985); in some cases it is difficult to make such comparisons (eg K-28 cores proposed in 1988). There is also very little information on the underlying environmental changes. The issue of the disappearance of the ruber d’or-bigny horizons in the Indian Ocean that are important to the resolution of paleoceanographic tasks remains controversial. All of these ambiguities are, first of all, related to the difficulty in obtaining a good succession of continuous profiles of carbonate sediments from the deep-sea parts of the Indian Ocean near the equator, where the foraminiferal surface is relatively inhomogeneous and
其他文献
ZK60板材在旋转速率800 r/min、焊接速度120 mm/min下进行搅拌摩擦焊接,然后对焊接板材在200~400℃进行退火处理。结果表明,热处理可提高焊后接头的力学性能。在200℃退火后
随着社会经济的迅速发展,医疗事业单位也面临着较大的竞争压力,医院作为医疗机构中较为重要的部分,想要实现其稳定发展,就需要对财务管理所具有的重要性进行全面认识.本文主
美俄拟共同以南冰洋为舞台进行冰上漂流试验。美俄的科技工作者将在南极的浮冰上设营,在作几个月漂流的同时观测冰与海洋、大气的关系,目的在于搞清楚南极的冰对大气和海洋
The Met’s special exhibition of Chinese painting and calligraphymasterpieces presents the best of Chinese art‘Looking closely at the calligraphy,you can feel
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
期刊
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
期刊
A series of novel tetracyclic triterpanes based on the lanostane skeleton, ranging in cars-bon number from C_(30) to C_(32), were identified for the first time
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
期刊
企业在追求自身利润最大化的同时往往忽视社会责任的承担,不利于企业的可持续发展,为了促进企业履行社会责任,强化企业社会责任信息披露的意识,本文从分析企业社会责任信息披
航运业作为基础性的运输产业,是我国经济发展的基础,是我国对外贸易的重要支撑点.但是,随着近几年来国际经济环境的日益紧张,贸易摩擦以及贸易纠纷等带来了原油价格的上涨以