67P/Churyumov-Gerasimenko. A Single Body That’s Been Stretched- Part 35

HOW THE COVE OPENED UP 
  
   
This post continues on from Parts 33 and 34.

Dark green- the top line used to be sandwiched to the bottom line. The bottom green line, up to the mauve line, is in fact the head rim gull wing match. It matches to the body gull wings 1000 metres below. The upper green line was a third delaminated layer, another gull wing when all three were sandwiched on the body. If you zoom into the unannotated version, you can see a kink along this upper line that’s exactly the same distance along it as the main kink is along the classic gull wings below it. But it’s fairly obvious the two lines match anyway. 

Pale orange- this lump at the end of the upper green line sat in the same shaped trough at the end of the lower green line. The base of the lump is the same distance below its green line as the base of the trough is below its green line. 

Light blue- these are the bottom and middle matching holes that correspond to the bottom and middle scallops. The scallops delaminated along with their holes and rode up when the head began to herniate from the body under the tensile force of spin-up. The bottom hole is shallower, in fact rather flat, betraying the fact that it was an aperture, squeezed against the wider crater rim on the body (as discussed in Part 34).

Yellow- the bottom of the bottom scallop (at the head rim) and the bottom of the middle scallop. These two lines aren’t very useful here but will be when referring back from the next part. They don’t look as if they fit together but that’s because a) the green line is usually marked yellow but is marked green here for matching purposes b) the dark orange feature is a mini-delamination that slid up, away from its original seating on the right hand section of the bottom yellow line. Part of the orange shape is obscured by the yellow head rim that’s slightly nearer to us. When the orange shape is slid back to its seating on the rim, it means the upper yellow curve fits to the left hand section of the orange line and not the lower yellow rim line to the right of that. 

Dark orange- see ‘yellow’, above.

Mauve- dykes as described in Part 8, January 2015. The left line stops short of its opening in order to show its fluted end point that is one of the main gas outlets for the three delaminated holes. If you recall, Part 34 stated that the gull wings slid from the horseshoe crater rim when on the body and opened up an aperture in the process. This is the dyke that fed that aperture. It’s no coincidence that the left side fluting of this dyke kisses the right tip of the gull wings because the gull wing tips defined the slide. The body gull wings still have that slide signature. The other three mauve dykes emerge in the tighter section of cove that corresponds to the small, horseshoe crater 1000 metres below. Since this section of the cove sat against the now open end of the horseshoe it means that it’s the section that rock C was originally shunted against (see Part 33). Rock C has three mini-scallops and its seating in the horseshoe has three corresponding feeders (two mini-scallops, one flat, suspected dyke). That seems almost too neat but there are three dykes here and a hint of three mini-scallops within the cove itself. Mini-scallops seem to be found wherever catastrophic outgassing is suspected to have occurred (because slurry signatures and scouring signatures are also present).  

PHOTO CREDITS:

Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

To view a copy of this licence please visit:

http://creativecommons.org/licenses/by-sa/3.0/igo/

All dotted annotations by Scute1133.

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One thought on “67P/Churyumov-Gerasimenko. A Single Body That’s Been Stretched- Part 35

  1. Pingback: Allgemeines Live-Blog ab dem 9. Januar 2016 | Skyweek Zwei Punkt Null

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