Does Glacial-Interglacial Transition Affect Sediment Accumulation in Monsoon-Dominated Regions?

来源 :Acta Geologica Sinica(English Edition) | 被引量 : 0次 | 上传用户:guohaoyan
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
The spatio-temporal changes in sedimentation rate along the continental margin of the monsoon-dominated eastern Arabian Sea during the last 24 kyr have been estimated from a compilation of 58 radiocarbon dated cores,in order to understand the effect of glacial-interglacial variation on sedimentation.The sedimentation rate has been computed for four-time slices,viz.the last glacial maximum,glacial-interglacial transition,early Holocene and late Holocene.We report that the average sedimentation rate in the slope to the abyssal region of the entire eastern Arabian Sea,although higher during the Holocene as compared with that during the last glacial maximum and glacial-interglacial transition,does not significantly vary during all four-time intervals.The sedimentation rate during any particular time interval,however,varies from core to core,thus indicating zonal changes.We report four zones of relatively high sedimentation rate,viz.the northeastern Arabian Sea,the region off the Gulf of Khambhat,the region off Goa and Mangalore,and off the southern tip of India.We suggest that a complex interaction of land-ocean-atmospheric processes controlled sedimentation rate in the eastern Arabian Sea during the last 24 kyr in such a way that the average sedimentation rate does not vary significantly,even during highly contrasting climatic conditions. The spatio-temporal changes in sedimentation rate along the continental margin of the monsoon-dominated eastern Arabian Sea during the last 24 kyr have been estimated from a compilation of 58 radiocarbon dated cores, in order to understand the effect of glacial-interglacial variation on sedimentation . The sedimentation rate has been computed for four-time slices, viz. The last glacial maximum, glacial-interglacial transition, early Holocene and late Holocene. We report that the average sedimentation rate in the slope to the abyssal region of the entire eastern Arabian Sea, although higher during the Holocene as compared with that during the last glacial maximum and glacial-interglacial transition, does not vary vary during all four-time intervals, however, varies from core to core, therefore indicating zonal changes. We report four zones of relatively high sedimentation rate, viz. the northeastern Arabian Sea, the region off the Gulf of Kh ambhat, the region off Goa and Mangalore, and off the southern tip of India. We suggest that a complex interaction of land-ocean-atmospheric processes controlled sedimentation rate in the eastern Arabian Sea during the last 24 kyr in such a way that the average sedimentation rate does not vary significantly, even during highly contrasting climatic conditions.
其他文献
The Upper Carboniferous—Lower Permian(Upper Pennsylvanian-Asselian) Tobra Formation is exposed in the Salt and Trans Indus ranges of Pakistan.The formation exh
生态课堂的创建为我们一线的教师提出了高要求。如何创建生态课堂是新课改形式下的崭新话题。本文以牛津英语教学案例为例,简单谈谈初中英语生态课堂的创建的实践和思考。
文章结合本人的语文教学实践,列举了中学生在作文过程出现的种种缺乏真情实感的现象,浅析其原因,有针对性的提出对策,从课内课外阅读、课堂教学、作文与生活的联系的方面采取行之
小学生处于身体、思想、心理、道德等多方面发布不成熟时期,虽然身心发展速度快,但是因为自控能力较差,注意力多为无意注意,因此极易受到外界与学习无关的其他刺激的干扰,导
由于神经科学的进展,科学家正开始斩断强力止痛与成瘾、过量用药及死亡之间的牵连你可能并不知道,拇指囊肿是大脚趾根部的骨质增生。当这种增生开始影响脚的其余部分时,你就
期刊
小学语文教学对学生一生的教育起到了关键的作用。首先,教小学生要懂得心理学,要遵照小学生的年龄特点和心理需求,小学生的持久力不强,每一个人和每一个人的潜质都有差别,教学要因
期刊
期刊
舞蹈和音乐是两种不尽相同却密切相关的艺术表现形式,随着社会的不断进步,文化发展的步伐也是日进加快,将舞蹈音乐引入到中职教育的教学中,是推进中职教育快速发展的一项重要
当仅仅一个基因变异首次让欧洲人喝牛奶,就注定了欧洲大陆的大变革。  20世纪70年代,在波兰中部肥沃平原上的一个石器时代遗址从事发掘时,考古学家博古奇发现了一连串奇怪的古物。大约7000年前生活在这里的人们,属于中欧首批农民。他们留下了点缀着小孔的陶器碎片。看上去,粗糙的红色黏土当初就像是被多根稻草刺穿着烤制的。  查询考古文献,博古奇找到了古代穿孔陶器的其他样本。如今就职于美国普林斯顿大学博古奇
期刊