Sunday, 18 November 2012

The magnetic properties of the Cleveland dyke in the south west area of Cleveland North east england

                                              The Magnetic properties of the Cleveland Dyke

In this post i will attempt to produce an accurate report into my findings, regarding the magnetic
properties of the Cleveland dyke, in the south west area of Cleveland

I would like to start by saying i became involved in this subject accidentally, ie my research at the time was focused on the superficial geological deposits covering this area, i would regularly cross the path of the Cleveland dyke without giving it a lot of thought, until i started to wonder whether it could have played a part in forming the landscape we now walk upon.

I had been excavating what Ive named the Stanton gravel beds, for over two years in an attempt to prove that the superficial deposits of the South West area of Cleveland, were in fact not the documented glacial mess they were said to be, i had started to find that there was no signe of the bolder clay- till  that i should have been finding in my excavations, but instead i was finding well sorted separated alluvial deposits, sat upon an equally well sorted gravel bed. The simple diagram below shows my findings either side of the Cleveland dyke.

The alluvial deposits above the Stainton gravel beds i found were all but stoneless, just hard packed friable clay, i found no evidence of lamination's- varved clay. These deposits as documented on my blog reports at  cover the entire South West Cleveland area,  and strangely seem to begin and end at the boundaries of the Mercia mudstone bedrock zones of this area.

 Above red then blue strange clay deposits sit below the red plastic clay that always sits beneath the gravel beds, the red brown Alluvium can be seen above the gravel beds at my main excavation at Maltby beck.  More on the Maltby beck deposits can be viewed by a simple search on this blog.
Above Roger Curry points out the gravel bed at my main excavation at Stainton, with the red brown plastic clay below his feet, and the almost stoneless separate alluvial layers above.

In my excavations i started to notice a lot of what looked like whinstone, mostly angular towards the bottom of the gravel beds, that in the Stainton area average about 300 mm thick.   The gravels becoming smaller toward the top, again i did not give it much thought, but then the thought as to how the whin stone had become part of this thin uniformed gravel bed, containing organic material including the bones of animals and humans, that was then buried beneath up to three metres of separate almost stoneless alluvial deposits started to really puzzle me.

I  then noticed that the whinstone attracted a none rare earth magnet as can be seen below at my main excavation at Stainton, i reported these findings to the local Riggs group who i had recently had a visit from members Andy Cooper and Allen Simkins, Andy replied with great interest and initial surprise at my reports, and arranged a date for a visit to view and test the samples i had excavated from the Stainton gravel beds.

I decided to test the whinstone left over from the nearby Stainton quarry, i found that all samples i tested  attracted the same none rare earth magnets quite easily. I reported this to Andy and Allen and they visited not long after and tested the samples themselves, finding my reports as being correct.

Andy took some samples to test himself and pass on to a Geologist at Durham university, he later sent me the reply from the Geologist, who i would rather not name without his permission, the report stated that he thought the samples were not Whinstone from the Cleveland dyke in the Stainton quarry area but must be whin sill that had been transported here via glacial movements, as the whinn sill stone had been found to have a higher magnetic content.

( A statement i will soon show to be wrong! )

This had me puzzled as most of the whinstone found in the Stainton gravel beds is angular and this to me points to the rock not travelling to far, and is it just a big coincidence that the dyke is very close by !?. I then remembered i had come accross old cobbles at the site of the old whinstone quarry, i tested all of the cobbles i could find at the quarry site, each one easily attracted a none rare earth magnet.

 Above a piece of whinstone mined from the Stainton outcrop, now at the entrance to the now excellent nature reserve, note the different none rare earth magnets stuck to the whinstone.

The Cleveland dyke was created by the then molten rock squeezing through older rock, one thing i found very interesting was that the dyke was created about 59 mya and that the planet at that  time was in a period of reversed polarisation, as can be seen on the chart above the white segments marking periods of reversed polarisation.

 Roger Curry an armature mineralogist and good friend points to rare earth magnets he used, actually sticking to this whinstone at Stainton after being thrown from over two feet away.

Above a partially washed out whinnstone bolder at Stainton beck, with a none rare earth magnet attached with a thin piece of paper between, to rule out any mud or other material causing the magnet to stick.

Above the cobble taken from Stainton quarry again notice the none rare earth magnet stuck to the cobble, the paper shows nothing else is causing the magnet to stick to the stone, other than magnetic attraction

Simple experiment showing a compass needles deflection by the dyke stone at Stainton


I took a cobble home cleaned it and re tested it with the same results, i  conducted a simple experiment using a compass.    pictured above,    the results i found quite amazing, again i reported the findings to Andy Cooper  ( tvriggs )  he too was more than surprised, i had placed the whinstone cobble that was shaped from the whistone of the Cleveland dyke at Stainton quarry, on a plastic wheelie bin well away from any metallic object, i then approached the cobble holding the compass in front of me, the compass needle was deflected 180 degrees.

I repeated the process with a similar sized piece of Whinn sill from high force at Tees dale, then a piece of Laverkite from the Staithes sea wall  , then a piece of Whin stone taken from an outcrop of the Cleveland dyke at Codberry in upper Teesdale.


Stainton  whinstone 70 - 180 degrees

Whinn sill deflected 70-80 degrees ( High force)

Laverkiite deflected 20 degrees ( Staithes sea wall )

Coldberry ( Cleveland dyke ) 40-60 degrees

                                      Tests carried out on an eight mile stretch of the dyke

            I  was asked by Andy Cooper of  riggs group if i could test other parts of the dyke for the same Phenomena, i agreed to conduct the same tests as carried out at the Stainton quarry site. I decided to walk the length of the Cleveland dyke as best i could from Stainton quarry to Cliff rigg an old whinstone quarry on the edge of the Cleveland hills, aproxomatly 8 miles walking distance.

When there were no outcrops of insitue dyke to test i tested rock  on the surface, i had little magnetic responce to a none rare earth magnet, until i reached the langhbargh ridge just east of old Nunthorpe, there i found a few surface pieces of whinstone that did attract the magnets, i then proceeded east towards a known Dyke outcrop near the Whinstone view caravan site, here i found an attraction but it did not mach that of the Stainton stone.

I carried on towards cliff rigg checking track stone that sometimes attracted the magnets, but as a whole did not come close to the attraction i was used to finding in the Stainton quarry location, as i reached the bottom of the Cleveland hills just north east of Great Ayton, i joined a track that leads up to the old whinstone workings at Cliff rigg, i decided to drop severall none rare earth magnets on the track, immediately i noticed the magnets were covered in small stone particles and dust, i came to the conclusion that the track must have originally been made using the same stone that was being quarried, and therefore the stone particles and dust were from worn down whinstone from the Cliff rigg mine.

Cliff Rigg: View down the quarry towards Teesside in the far distance.
June 2011 (Cliff-Rigg-Whinstone-Quarry-User-Album-Image-63037)

I proceeded to climb up to the worked outcrop of the Cleveland dyke at Cliff rigg, pictured above from
 the top looking out towards Teeside, there i tested both left over whinstone and the few insitue sections of the dyke but again i found a low attraction compared to the Stainton quarry site.

                                                    Stainsby beck Dyke outcrop at Thornaby on Tees.

The next ourcrop i decided to test was at Stainsby beck Thornaby on tees Cleveland, again i found either no attraction to the same none rare earth magnets used at both Stainton and cliff rigg, or a far weaker magnetic responce on a few samples, than at the Stainton quarry location, i checked a lot of whinstone at this location and can say as at cliff rigg, the whinstone here has a far less magnetic attraction than that of the stone from the Stainton quarry site, although i did test a branch of the dyke between the two sites ie Stainton and Stainsby, and did find stone of the same level of attraction as at Stainton just south of Stainton vale farm.

More can be viewed about my  work at this site by using the link below;postID=7799436622521730105;onPublishedMenu=allposts;onClosedMenu=allposts;postNum=2;src=postnamework 

 Trip to test Whinn sill at Teesdale and whinstone at Codpool also Teesdale

The video links below show myself and good friend Andy Cooper at the above locations testing the Magnetic attraction of the stone to none rare earth magnets, the videos are not great but neither were the conditions.

In the two videos myself and Roger have attempted to show the best we could, that there is a significant difference in the magnetic attraction of both other areas of the Cleveland dyke, and also the Great whinn sill, at Teesdale to that of the Stainton stretch of the Cleveland dyke, ie the Stainton stone is far more magnetic than any tested so far.

Below is a video myself and Roger took at Stainton showing the attraction there, and a decent view of the Stainton gravel bed at my main excavation, sorry i know the video's aren't great but we are on a very tight budget here !

 More soon. 

No comments:

Post a Comment

Please feel free to correct me on any part of my blog, i would also welcome any help that can be offered in correctly identifying some of my fossil finds All the best to all Heath.