Editing Northern Pennine Orefield: Weardale and Nenthead - an excursion

Jump to navigation Jump to search

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.

This page supports semantic in-text annotations (e.g. "[[Is specified as::World Heritage Site]]") to build structured and queryable content provided by Semantic MediaWiki. For a comprehensive description on how to use annotations or the #ask parser function, please have a look at the getting started, in-text annotation, or inline queries help pages.

Latest revision Your text
Line 37: Line 37:
 
Drive north from Westgate [NY 908 381] along the steep unclassified road which leads to Rookhope and park opposite an old lime kiln on the roadside adjacent to West Rigg Quarries ([[:File:YGS_NORTROCK_FIG_14_1.jpg|Figure 14.1]]).
 
Drive north from Westgate [NY 908 381] along the steep unclassified road which leads to Rookhope and park opposite an old lime kiln on the roadside adjacent to West Rigg Quarries ([[:File:YGS_NORTROCK_FIG_14_1.jpg|Figure 14.1]]).
  
=== Locality 1, West Rigg Quarries [NY 911 392], an '''S.S.S.I'''. ===
+
=== Locality 1, West Rigg Quarries [NY 911 392], an '''S.S.S.I'''. ===
  
 
West Rigg Quarries, on the east side of the road, provides one of the finest surface exposures of a major vein in the orefield today. The Slitt Vein forms a conspicuous vertical wall several metres wide running almost east–west through the quarries. Here it consists almost entirely of quartz with a few lenses of fluorite and only rare bands of galena. Old levels driven along galena-rich bands may be seen within the central part of the vein. Horizontal '''slickensides''' are present on the south face of the vein indicating lateral movement after its formation. At West Rigg the vein cuts the Great Limestone, large volumes of which have been replaced by the iron carbonate minerals '''siderite''' and '''ankerite''' during the mineralizing episode. Weathering of these to ''''limonite'''' produced huge deposits of iron ore which were quarried here late last century. The quarry represents the extent of these 'flats', a few remnants of which may be seen as dark brown outcrops on the quarry walls.
 
West Rigg Quarries, on the east side of the road, provides one of the finest surface exposures of a major vein in the orefield today. The Slitt Vein forms a conspicuous vertical wall several metres wide running almost east–west through the quarries. Here it consists almost entirely of quartz with a few lenses of fluorite and only rare bands of galena. Old levels driven along galena-rich bands may be seen within the central part of the vein. Horizontal '''slickensides''' are present on the south face of the vein indicating lateral movement after its formation. At West Rigg the vein cuts the Great Limestone, large volumes of which have been replaced by the iron carbonate minerals '''siderite''' and '''ankerite''' during the mineralizing episode. Weathering of these to ''''limonite'''' produced huge deposits of iron ore which were quarried here late last century. The quarry represents the extent of these 'flats', a few remnants of which may be seen as dark brown outcrops on the quarry walls.
Line 43: Line 43:
 
This quarry is best examined from the road. Immediately west of the road are further extensive opencast workings and dumps, also associated with iron ore 'flats', though little is exposed here today.
 
This quarry is best examined from the road. Immediately west of the road are further extensive opencast workings and dumps, also associated with iron ore 'flats', though little is exposed here today.
  
Further west across the Middlehope Valley the overgrown dumps and reservoir of Slitt Mine may be seen. Slitt Mine, from which the vein takes its name, worked galena from levels and a shaft 178 m deep sunk into the Whin '''Sill''', here beneath the Tyne Bottom Limestone. Mining at Slitt ceased in 1878. Slitt Vein, one of the longest veins known in the orefield, belongs to a small group of predominantly east–west fractures known as the 'Quarter-Point' veins along which the main displacement was horizontal rather than vertical. The 'Quarter-Point' veins, including Slitt Vein, have been the main sources of fluorspar in recent years (see also Excursion 15).
+
Further west across the Middlehope Valley the overgrown dumps and reservoir of Slitt Mine may be seen. Slitt Mine, from which the vein takes its name, worked galena from levels and a shaft 178 m deep sunk into the Whin '''Sill''', here beneath the Tyne Bottom Limestone. Mining at Slitt ceased in 1878. Slitt Vein, one of the longest veins known in the orefield, belongs to a small group of predominantly east–west fractures known as the 'Quarter-Point' veins along which the main displacement was horizontal rather than vertical. The 'Quarter-Point' veins, including Slitt Vein, have been the main sources of fluorspar in recent years (see also Excursion 15).
  
 
Continue north along the hill road to Lintzgarth.
 
Continue north along the hill road to Lintzgarth.

Please note that all contributions to Earthwise may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Earthwise:Copyrights for details). Do not submit copyrighted work without permission!

Cancel Editing help (opens in new window)

  [] · [[]] · [[|]] · {{}} · · “” ‘’ «» ‹› „“ ‚‘ · ~ | °   · ± × ÷ ² ³ ½ · §
[[Category:]] · [[:File:]] · <code></code> · <syntaxhighlight></syntaxhighlight> · <includeonly></includeonly> · <noinclude></noinclude> · #REDIRECT[[]] · <translate></translate> · <languages/> · ==References== · {{reflist}} · ==Footnote== · {{reflist|group=note}} · <ref group=note> · __notoc__ · {{DEFAULTSORT:}} <div class="someclass noprint"></div> {{clear}} <br>