全文获取类型
收费全文 | 42篇 |
免费 | 10篇 |
国内免费 | 3篇 |
专业分类
大气科学 | 3篇 |
地球物理 | 7篇 |
地质学 | 24篇 |
海洋学 | 4篇 |
综合类 | 3篇 |
自然地理 | 14篇 |
出版年
2021年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2010年 | 1篇 |
2007年 | 2篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 7篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有55条查询结果,搜索用时 46 毫秒
51.
Mineral magnetic methods of characterising glacial diamicts and their associated sediments are applied to deposits within the Manx Quaternary sequence. The possible advantages of these techniques over more traditional methods of sediment characterisation are outlined, and the results obtained in a pilot study are examined. Results show that both distinctions and similarities exist within the magnetic mineral assemblages of the four diamict units studied. The possible implications of these results for interpreting the Late Quaternary history of the Isle of Man and the future potential of the techniques are briefly discussed. 相似文献
52.
53.
郧西人遗址洞穴发育与埋藏环境初步观察* 总被引:3,自引:0,他引:3
湖北省黄龙洞"郧西人"遗址是2004年新发现的一处重要的更新世晚期古人类遗址。3年来已经进行过3次发掘,出土了距今约10万年的晚期智人牙齿化石及文化遗物,是在东亚地区发现时代最早的现代人遗址。黄龙洞处于秦岭东段南麓的两郧断裂带,发育于上震旦系陡山沱组细晶灰岩和泥灰岩地层中,周围紧闭褶皱和次级断裂发育,为岩溶的发育提供了先决条件。黄龙洞的形成表现为前期以岩溶裂隙水溶蚀为主,后期则转变为大型管道状溶洞。古人类进入洞穴的出入口可能从洞顶"天窗"型开口入洞。古人类遗物属原地埋藏环境,活动期气候以温暖、干燥为主。 相似文献
54.
55.
A. Swift 《Geological Journal》1993,28(2):171-177
A range of colour alteration index (CAI) values between 3.0 and 6.0 is recorded for conodont elements recovered from the Arundian to Brigantian (Dinantian, Lower Carboniferous) sequence around Castletown, Isle of Man. Mantle-derived heat, channelled through the Caledonian South Barrule pluton, is proposed as the major cause of these elevated values. A lower CAI of 2.5 is obtained from elements recovered from a borehole sunk into the concealed Namurian (Upper Carboniferous) deposits near Shellag Point; the Glen Mona pluton acted as the medium for mantle-derived heat in this instance. The CAI values which may have been established during a late Dinantian volcanic episode around Castletown were overprinted by the greater effects of heat emanating from the South Barrule pluton. The record of CAI 6.0 for a sample taken from the immediate vicinity of a dyke indicates a high level of very localized CAI elevation in the early Tertiary. 相似文献