Talk:Carnegie Ridge

A fact from Carnegie Ridge appeared on Wikipedia's Main Page in the Did you know column on 5 September 2010 (check views). The text of the entry was as follows:

Did you know... that the Carnegie, a brigantine made almost entirely from non-magnetic materials, covered nearly 300,000 miles measuring Earth's magnetic field and discovered the Carnegie Ridge in 1929?

A record of the entry may be seen at Wikipedia:Recent additions/2010/September.

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File: Cratons West Gondwana.svg

Between the Guiana Shield and the Brazilian Shield there is a lineament: the Galapagos, the Carnegie Ridge, the Amazon River estuary and trench, St. Paul trench, Romanche Trench, Niger River estuary, Benue Trench (Gansser, Augusto (1973). "Orogene Entwicklung in den Anden, im Himalaja und den Alpen: ein Vergleich". Eclogae Geologicae Helvetiae (in German). 66. Lausanne: 23–40.).

São Luís do Maranhão and Ghana have the Equatorial Atlantic flood basalts.

It's the border between the North and the Central Volcanic Zone, let's see if I find something more recent.

--Chris.urs-o (talk) 17:16, 2 November 2010 (UTC)[reply]

--Chris.urs-o (talk) 19:30, 2 November 2010 (UTC)[reply]

I don't think that it's likely to be bigger, more likely to be smaller as it says in the article, possibly only 60 km of subducted ridge. Its suggested origin as the track of the Galapagos hotspot would also argue against that possibility. Mikenorton (talk) 18:53, 2 November 2010 (UTC)[reply]

Also the Galapagos hotspot is just 20 million years old according to some, whereas the Equatorial Atlantic flood basalts are part of the Jurassic CAMP. James Pindell assumes that the hotspot is older, and was sited in the Caribbean during the Late Cretaceous, causing the anomalous thickened crust of the Caribbean Plateau (see his Fig. 14) [1]. Mikenorton (talk) 19:48, 2 November 2010 (UTC)[reply]

CAMP begins at: 190-180 Ma, Equatorial Atlantic flood basalts at 89 Ma. It is difficult to sort out this jungle. The evolution of the South Atlantic can be seen here 3 I want to read ur refs (Plate Tectonics, driving force) first, after I'll look if the Amazon flows through a trough ;)

--Chris.urs-o (talk) 20:24, 2 November 2010 (UTC)[reply]

--Chris.urs-o (talk) 02:56, 3 November 2010 (UTC)[reply]

OK, I got the wrong LIP, the Equatorial Atlantic flood basalts are mainly about 120 Ma, although with some activity in the Benue Trough continuing until 68 Ma, with the main magmatism associated with the final break-up of South America from Africa according to this [2]. Mikenorton (talk) 22:39, 2 November 2010 (UTC)[reply]

File:Carnegie Ridge.png shows the border of the Nazca and Cocos Plate different to here 4. If ur red lines are a spreading ridge then the Amazon is more a sea than a river. --Chris.urs-o (talk) 05:31, 3 November 2010 (UTC)[reply]

Chris, plate boundaries were taken from Gutscher et al. 1999, and I'm struggling to see any differences with those shown in your link. Also you've lost me completely with your comment about the Amazon. Mikenorton (talk) 09:09, 3 November 2010 (UTC)[reply]

Sorry ;) File:Cocos-Caribbean.jpg shows the spreading ridge going North, ur picture seem ok, my fault. And there is an inactive rift between the Guiana Shield and the Amazonian Shield, that's why the note on Amazon. (Zandt, George (Spring 2002). "Orogenic Systems: The Andes". University of Arizona., see figure 1 and 19.) I saw u uploaded twice ur picture on commons, take care, purge the browser history, the thumbs seem to live longer on commons. --Chris.urs-o (talk) 09:34, 3 November 2010 (UTC)[reply]

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