网络释义 1. 弗里德堡陨石坑 弗里德堡陨石坑(Vredefort crater)是地球上已确认的最大撞击坑,位于南非共和国自由邦省,由地处撞击坑中心附近的城镇 …www.baike.com|基于90个网页 2. 弗里德堡坑 弗里德堡坑(Vredefort crater)是地球上今朝已确认的最年夜碰击坑www.wghack.com|基于1 个网页...
修饰名词"impact crater"用形容词,所以用know的形容词known,意为"已知的"。故填known。(2)考查动词时态和语态。句意:陨石坑,顾名思义,是小行星撞击地球等天体时形成的。这里为本句谓语动词,根据从句时态可知,主句时态为一般现在时;主语"an impact crater",为名词单数,和动词form之间存在被动关...
We performed ground magnetic surveys across a portion of a prominent negative magnetic anomaly that extends in a broad semicircular belt about half way into the basement floor of the crater. Magnetic anomalies defined by our data are most often negative and occur over a wide range of wavelengths...
读过 在读 想读 我来写短评 热门 最新 还没人写过短评呢 << 首页 < 前页 后页> > Vredefort Crater 作者: Surhone, Lambert M.; Tennoe, Mariam T.; Henssonow, Susan F. 页数: 84 isbn: 6133549394 书名: Vredefort Crater© 2005-2024 douban.com, all rights reserved 北京豆网科技有限...
Previous investigations of the structure of this large impact crater, based on integrated geophysical modeling, have shown that the central rise structure is an upper crustal feature with a presently recognized uplift of some 12 km, decreasing to about 4 km at the depth of the Moho. This study...
old Vredefort Structure is considered to be a meteorite crater by some workers, but of endogenous origin by others. Petrologica... W.,SCHREYER - 《Journal of Petrology》 被引量: 76发表: 1983年 Deeply exhumed impact structures: A case study of the Vredefort structure, South Africa The main...
The original crater, now eroded away, is estimated to have been 250 - 300 kilometres in diameter. Some 70 cubic kilometres of rock would have been vaporised in the impact. The Vredefort structure is currently regarded the biggest and oldest clearly visible impact structure on Earth. It just...
Vredefort Crater cross-section: This cross-section shows the structure of the Vredefort Impact Crater at a time shortly after it was formed. The rocks of the Witwatersrand Basin, Ventersdorp Lava, Ghaap Dolomite, and Pretoria Subgroup were originally deposited in a nearly horizontal position but...
(1998) Constraints on the size of the Vredefort impact crater from numerical modeling. Meteoritics and Planetary Science 33: pp. 483-490Turtle, E. P. & Pierazzo, E. , 1998 . Constraints on the size of the Vredefort impact structure from numerical modelling . Meteoritics and Planetary ...
Lightning remagnetiza- tion of the Vredefort impact crater: no evidence for impact-generated magnetic fields. J. Geophys. Res. 117, 1-17.Carporzen, L., Weiss, B. P., Gilder, S. A., Pommier, A., and Hart, R. J. (2012). Lightning remagnetization of the Vredefort impact crater:...