tyree Posted July 5, 2005 Share Posted July 5, 2005 I was wondering what type of rock was prevalenton the Navigator Wall?? Does any body know or know somebody who knows? Thanks in advance- tyree Quote Link to comment Share on other sites More sharing options...
crazyjizzy Posted July 5, 2005 Share Posted July 5, 2005 The latest geologic map which I have (Tabor and others, 2002)which only covers to the border, shows intrusive rocks of the Chilliwack Batholith. That said, Beckey mentions dioritic rocks. Need to know more? Quote Link to comment Share on other sites More sharing options...
Andrew_R Posted July 5, 2005 Share Posted July 5, 2005 I talked to a friend recently who was a good friend of Guy and John's (who'd climbed the navigator) and apparently they said "it was fine just a little run out in places"... I didn't ask for more info... I'm a bit more interested in the east pillar but I'm sure it would be a good route too. I hope u crank it Quote Link to comment Share on other sites More sharing options...
John Frieh Posted July 5, 2005 Share Posted July 5, 2005 Does any body know or know somebody who knows? Â Word up... anybody know somebody who has climbed this? Quote Link to comment Share on other sites More sharing options...
tyree Posted July 5, 2005 Author Share Posted July 5, 2005 I havent been up to slesse yet but from what I have heard the north rib is primaraly composed of some granite, NE but is some sort of choss or another so it seems to be a mixed bag. i was hoping to hear it was mostly granite but i guess we'll find out soon. thanks for the info and if yall hear any more id be interested in hearing about it. Quote Link to comment Share on other sites More sharing options...
forrest_m Posted July 5, 2005 Share Posted July 5, 2005 the east pillar is almost entirely diorite (or whatever the non-granite on slesse is), though the lower buttress toe (to the top of the first pitch per mclane) is granite. my impression is that nav. wall. is similar. northeast butt. is strange, mostly granite down low and on the right (north) side, but the joint with the diorite is right on the crest on the upper half of the route. Â despite not being granite, the diorite is not pure choss, either; on the e. pillar, it was pretty solid, with lots of edges, but without long continuous crack systems. we did a lot of face climbing to connect small corners, flakes and whatnot. we placed a lot of smaller cams and were happy for the fixed pro. again, nav. wall appears to be similar. Quote Link to comment Share on other sites More sharing options...
Bigwall Posted July 6, 2005 Share Posted July 6, 2005 (edited) Sorry. What was I thinking?! My post beginning with "I believe Beckey describes the non-granite rock on NEB of Slesse as "granodiorite" was way off the mark. Apologies to Tyree. Thanks to Crazyjz and Dru for the accurate info. Edited July 11, 2005 by Bigwall Quote Link to comment Share on other sites More sharing options...
crazyjizzy Posted July 6, 2005 Share Posted July 6, 2005 Granodiorite is lumped by many petrologists as "granite". Grain size is independent of mineralogy. Brittleness is dependant on a whole range of factors, as are crack ststems. As a first order assumption, one couls assume that the dioritic rock are probably older, and as such were affected by the emplacement of the younger acidic rocks in such a way to cause more jointing and incipient cracks. These will preclude the development of larger/longer crack systems. This is only an easy model. Quote Link to comment Share on other sites More sharing options...
tyree Posted July 8, 2005 Author Share Posted July 8, 2005 well thanks again, that was very educational. I guess that we will find out soon if the weather cooperates. if anybody does know 1st hand i would be stoaked on some rock beta. Quote Link to comment Share on other sites More sharing options...
j_b Posted July 8, 2005 Share Posted July 8, 2005 hmm, the rock on the upper half of the NE buttress doesn't look igneous intrusive to me (but i could be wrong), by opposition to the lower part which is some kind of diorite. There are chunks of terranes older than the plutons all over the North Cascades and my not very detailed geologic map of the area shows that part of slesse is some kind of metamorphic rock. Quote Link to comment Share on other sites More sharing options...
Dru Posted July 9, 2005 Share Posted July 9, 2005 Slesse consists of a variety of rock types, separated from each other almost vertically. From east to west one goes through Chillwack Batholith then several older rocks ending up with Carboniferous-aged (IIRC) metamorphics on the west side. Â The Navvy Wall is Chilliwack Batholith granodiorite on the bottom and metamorphic on the top. Â See photo below... Quote Link to comment Share on other sites More sharing options...
Dru Posted July 9, 2005 Share Posted July 9, 2005 Â Flight 810 Buttress at left and South Peak East Face at right Navvy Wall route line in red Geologic contacts an approximation Lithology from personal experience and the geologic map of the area. The gneiss is really just the most metamorphosed part of the phyllite, the two are really the same geologic unit but the gneiss has undergone greater metamorphism along the Chilliwack Batholith contact, IMHO anyways. Quote Link to comment Share on other sites More sharing options...
Dru Posted July 9, 2005 Share Posted July 9, 2005 Roughly speaking the geologic contacts, are at the top of p6 and p15, respectively, if using the belays marked in the Beckey topo. Also the start of the red line that I drew differs from the topo start, which would go up from the snowpatch, to and through the B in Batholith, and then trend right along the ledge that the first geologic contact follows. Quote Link to comment Share on other sites More sharing options...
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