IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
钱方; 徐树金; 陈富斌; 赵永涛
Corresponding Author钱方
Source Publication山地研究
Other Abstract昔格达组广泛分布在四川西南部的金沙江、雅砻江、大渡河等河谷中,早先常隆庆称其为“混旦层”,时代归于上新世;后被袁复礼改名为昔格达组,时代归于第四纪中或后期。由于在昔格达组中迄今尚未发现哺乳动物化石,上部地层中孢子花粉也极少,因而对其时代长期存在着争论。第四纪冰川考察队、西南烈度队等认为属早更新世,四川省区域地层表编写组则认为属上新世。本文试图通过对昔格达组磁性地层研究,为较确切地测定该组的时代提供依据。; The results of magnetism measurements of the Xigeda Formation whit four sections in Southwest Sichuan show that the greater part of the Xigeda Formation is positive polarity which corresponds to the Couss, Polarity Epoch in the Late Cenozoic Era Polarity Timescale, There are two events of polarity reversal in it, which correspond to the Mammoth Event and the Kaena Event in the Couss. The upper part of the Formation is negative polarity which corresponds to the lower part of the Maturama Polarity Epoch. There are also two events of polarity revesal in it, which can correspond to the Reunion Event and the Olduval Event in the Maturama. The period during which the la -yer was formed from 3.286 million to 1.782 million years BP.The polarity series of the Xigeda Formation can correspond to the Number Ⅰ and Number Ⅱ of the Yuanmou Formation in Yunnun. It also corresponds to the Number Ⅱ and the lower part of the Number Ⅲ of the Yushe Formation in Shanxi. The information of the stratigraphic correlation and the paleontological correlation are in agreement with the results mentioned above. The age of the Xigeda Formation belongs to the Early Pleistocene Epoch. 
Keyword昔格达组 高斯正向期 磁性地层 古地磁 细砂岩 元谋 平均沉积速率 渡口 次极 中国第四纪
Document Type期刊论文
Corresponding Author钱方
Recommended Citation
GB/T 7714
钱方,徐树金,陈富斌,等. 昔格达组磁性地层的研究[J]. 山地研究,1984,2(4):275-282.
APA 钱方,徐树金,陈富斌,&赵永涛.(1984).昔格达组磁性地层的研究.山地研究,2(4),275-282.
MLA 钱方,et al."昔格达组磁性地层的研究".山地研究 2.4(1984):275-282.
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