DOCSLIB.ORG

The Distribution of Ammonium in Granites from South-West England

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Distribution of Ammonium in Granites from South-West England Journal of the Geological Society, London, Vol. 145, 1988, pp. 37-41, 1 fig., 5 tables. Printed in Northern Ireland The distribution of ammonium in granites from South-West England A. HALL Department of Geology, Royal Holloway and Bedford New College, Egham, Surrey TW20 OEX, UK Abstract: The ammonium contents of granites, pegmatites and hydrothermally altered rocks from SW England have been measured. Ammonium levels in the granites are generally high compared with those from other regions, averaging 36ppm,and they differ markedlybetween intrusions. The pegmatites show higherammonium contents than any other igneous rocks which have yet been investigated. Ammonium contents are strongly enriched in the hydrothermally altered rocks, includ- ing greisens and kaolinized granites. There is agood correlation between the average ammonium content of the intrusions in SW England and their initial "Sr/*'Sr ratios and peraluminosity. This relationship supports the hypothesis that the ammonium in the granites is derived from a sedimentary source, either in the magmatic source region or via contamination of the magma. Introduction Results Ammonium is present as a trace constituent of granitic The granites rocks, in which it occurs in feldspars and micas substituting isomorphously for potassium (Honma & Itihara 1981). The The new analyses of Cornubian granites are given in Table amount of ammonium in granites varies from zero to over 1. They show a range of 3-179 parts per million NH:, with 100 parts per million, and it has been suggested that high the highest values being found in relatively small intrusions. concentrations may indicate the incorporation of organic- Taking the averagefor each of the major intrusions,and rich sedimentary material into the magma, either from the weighting them according to their relative areas (see Table presence of such material in rhe magmatic source region or 4), the average ammonium contentof the Cornubian granites via the assimilation of organic-rich country rocks (Urano as a whole is 36 ppm. This is a somewhat higher level than in 1971; Itihara & Honma 1979; Hall 1987). The Variscan other granites that have been investigated: i.e. Cornubian granites of SW England show several indications of a granites, 36 ppm; all granitesand granodiorities (global substantialsedimentary contribution to theirparent magmas, forexample in their high initial H7Sr/s6Srratios, Table 1. Ammonium contents of Cornubian granites and they can therefore be used to test this hypothesis. These Specimen NH; granites also offer the opportunity of studying the influence Intrusionnumber Locality (Grid Ref.) (ppm) of post-magmatic hydrothermal phenomena on the distribu- tion of ammonium. P481 Dartmoor FernworthyForest (656836) 3 P487 Dartmoor Marytavy (545825) 6 P476 Dartmoor Merrivale (546753) 8 Analytical techniques P477 Dartmoor Dartmeet (680734) 9 P482 Dartmoor The granites which were analysed were chosen torepresent the. Chagford (713885) 11 P10 BurratorDartmoor (550680) 18 most widespread and common lithologies, with a principal aim of P547 Dartmoor BrentSouth (682631) 19 estimatingthe total ammonium content of theparental magmas. G11 HingstonG11Down Enrichment in ammonium associated with kaolinization was noticed Chilsworthy77 (410718) P453 BodminMoor early in thestudy, and thesuite of analysed rocks was therefore Cheesewring (262720) 84 P13 BodminMoor Caradon Hill (272705)87 restricted to those in the freshest possible condition. The majority P452 BodminMoor of the specimens were collected from quarry faces. Where outcrop Bolventor (177757) 111 P450 St Austell specimens were used they were obtained by breakingopen very Luxulyan (052588) 15 c7 Cligga Head Cligga Head (737538) 179 large blocks and their freshness was checked petrographically. The P512 Carnmenellis Polkanuggo50 (741347) criteria used to indicate freshness were minimal alteration of biotite P112 Carnmenellis Longdowns (738337) 50 to chlorite, and minimal presence of fine-grained alteration products P44 HernissCarnmenellis (735345) 58 in feldspar, although the feldspars in the granites of this region are P114 Carnmenellis Carnsew93 (759345) rarely completely clear. P113 Carnmenellis Mabe (743322) 102 The method of analysis was essentially that of Urano (1971). P23 Carnmenellis Pendarves (647383) 116 Samples were decomposed by an HF-H,S04attack, andafter P517 Carnmenellis Praze-an-Beeble (649353) 140 addition of NaOH the ammonia was separated by distillation and P49 Tregonning Wheal Reeth (589302) 161 measured colorimetrically ammoniumas mercuric iodide. P400 Lands End LamornaCove (450240) 16 Appropriate precautionswere takento minimize contamination P36 Lands End Geevor21 (374346) during the determination: deionized water was used throughout, all P404 Lands End(459342) Mill New 22 reagents were analysed for NH:, and reagent blanks were run with P4 1 Lands End Castle-an-Dinas (486346)37 every batch of samplesanalysed. Results are reproducible to P402 Lands End Sennen Cove (350263) 42 within 3 ppm for values below 30ppm, andto within 10% at P31 1 Lands End Porthmeor (425377) 53 higher levels. 37 Downloaded from http://pubs.geoscienceworld.org/jgs/article-pdf/145/1/37/4900588/gsjgs.145.1.0037.pdf by guest on 30 September 2021 38 HALL A. average), 27 ppm; British Caledonian granites, 33 ppm. The volumetrically significant major rock types rather than worldwide average is based on the figure given by Wlotzka minor varieties, but bulksamples of severalpegmatites (1972) of 21 pprn expressed as total elemental nitrogen. The were analysed. The similarity in ionic size and chemical figure for BritishCaledonian granites is an unweighted properties between ammonium and rubidium suggested the average of specimens from 32 intrusions (Hall 1987). possibility that ammonium might resemble rubidium in its It is noticeable that there are different ammonium levels geochemical behaviour, and would therefore be enriched in in each of the intrusions in SW England (Fig. 1). This is in pegmatites in the same way as rubidium. This expectation marked contrast tothe lack of variability in theirmajor turned out to bejustified, as the following NH: contents element compositions. For example,the average K,O were found in pegmatities from three localities: content of themajor intrusionsranges only from 5.0 to 5.3%, and yet the average ammonium contents vary from Knills Monument, St Ives (P129) NH: = 135 ppm 11 ppm in the Dartmoor granite to 94 ppm in the Bodmin Sands,Praa easternend (P308) 163 ppm Moor granite. Megilligar Rocks,W of Porthleven (P309) 332 ppm It would beinteresting to know whether there is any systematicvariation in ammonium levels within the Each of these pegmatites has a distinctive mineralogy. That individual plutons, but in practicethis is difficult to of Knills Monument contains minor tourmaline in addition establish. The largerplutons are undoubtedlycomposite, to quartz and feldspars, but has a negligible mica (lepidolite) butthey are not sufficiently well exposed for detailed content.The Praa Sandspegmatite contains quartz, structuralsubdivision, although thebroad distribution of feldspars andabundant zinnwaldite. The pegmatite of petrographictypes hasbeen mapped out (Dangerfield & Megilligar Rocks is composed of quartz, feldspars anda Hawkes 1981). One particular type of granite predominates small amount of zinnwaldite. The zinnwaldite-bearing in all the intrusions, namely a coarse porphyritic rock with pegmatites are associated with microgranite offshoots of the K-feldspar megacrysts, and the majority of the specimens Tregonning granite, which appearsto be rather richin analysed here are of this type. The megacrystic facies varies ammonium,whereas the Knills Monumentpegmatite is in NH: content within as well asbetween individual intruded into the Lands End granite, in which ammonium intrusions, and there is no obvious relationship between the contents are generally more moderate. It may be surmised NH: content and the abundance of phenocrysts. thatthe ammonium contentof pegmatites is determined The variation in ammonium content within intrusions is partially by the availability of NH: in the main magma body greaterthan the variation in majorelements, especially from which they were derived, and partly by enrichment in potassium, and there must be a suspicion that some of this the process of pegmatite formation. Assuming thatthe variation is due to incipient hydrothermal alteration, despite pegmatitesformed by the crystallization of magma in the theapparent freshness of the analysed specimens. It is presence of exsolved water, according tothe widely noticeable thatthe minor graniteintrusions of Hingston accepted view of Jahns & Burnham (1969), this would Down, Cligga andTregonning, which show high NH: suggest that NH: (like both K' and Rb+) is preferentially levels, are foci of intense hydrothermal activity. Onthe partitioned into the exsolved aqueous phase compared with other hand, relatively high values of NH: were also found in its parent magma. The association between the ammonium very fresh granites from the eastern partof the Carnmenellis ion and water rather than silicate melt may perhaps be a granites(Longdowns, Carnsew, Mabe)where all types of reflection of the propensity of the NH: ion for hydrogen hydrothermal alteration are rare.Thus the major differences bonding.This is apparent from the crystal structures of in NH: content between the Dartmoor, Carnmenellis and various ammonium salts, and is held to be responsible for Lands End granites at least are thought
Load more

Recommended publications
  • Minewater Study
    National Rivers Authority (South Western-Region).__ Croftef Minewater Study Final Report CONSULTING ' ENGINEERS;. NATIONAL RIVERS AUTHORITY SOUTH WESTERN REGION SOUTH CROFTY MINEWATER STUDY FINAL REPORT KNIGHT PIESOLD & PARTNERS Kanthack House Station Road September 1994 Ashford Kent 10995\r8065\MC\P JS TN23 1PP ENVIRONMENT AGENCY 125218 r:\10995\f8065\fp.Wp5 National Rivers Authority South Crofty Minewater Study South Western Region Final Report CONTENTS Page EXECUTIVE SUMMARY -1- 1. INTRODUCTION 1-1 2. THE SOUTH CROFTY MINE 2-1 2.1 Location____________________________________________________ 2-1 ________2.2 _ Mfning J4istojy_______________________________________ ________2-1. 2.3 Geology 2-1 2.4 Mine Operation 2-2 3. HYDROLOGY 3-1 3.1 Groundwater 3-1 3.2 Surface Water 3-1 3.3 Adit Drainage 3-2 3.3.1 Dolcoath Deep and Penhale Adits 3-3 3.3.2 Shallow/Pool Adit 3-4 3.3.3 Barncoose Adit 3-5 4. MINE DEWATERING 4-1 4.1 Mine Inflows 4-1 4.2 Pumped Outflows 4-2 4.3 Relationship of Rainfall to Pumped Discharge 4-3 4.4 Regional Impact of Dewatering 4-4 4.5 Dewatered Yield 4-5 4.5.1 Void Estimates from Mine Plans 4-5 4.5.2 Void Estimate from Production Tonnages 4-6 5. MINEWATER QUALITY 5-1 5.1 Connate Water 5-2 5.2 South Crofty Discharge 5-3 5.3 Adit Water 5-4 5.4 Acidic Minewater 5-5 Knif»ht Piesold :\10995\r8065\contants.Wp5 (l) consulting enCneers National Rivers Authority South Crofty Minewater Study South Western Region Final Report CONTENTS (continued) Page 6.
    [Show full text]
  • Copyrighted Material
    176 Exchange (Penzance), Rail Ale Trail, 114 43, 49 Seven Stones pub (St Index Falmouth Art Gallery, Martin’s), 168 Index 101–102 Skinner’s Brewery A Foundry Gallery (Truro), 138 Abbey Gardens (Tresco), 167 (St Ives), 48 Barton Farm Museum Accommodations, 7, 167 Gallery Tresco (New (Lostwithiel), 149 in Bodmin, 95 Gimsby), 167 Beaches, 66–71, 159, 160, on Bryher, 168 Goldfish (Penzance), 49 164, 166, 167 in Bude, 98–99 Great Atlantic Gallery Beacon Farm, 81 in Falmouth, 102, 103 (St Just), 45 Beady Pool (St Agnes), 168 in Fowey, 106, 107 Hayle Gallery, 48 Bedruthan Steps, 15, 122 helpful websites, 25 Leach Pottery, 47, 49 Betjeman, Sir John, 77, 109, in Launceston, 110–111 Little Picture Gallery 118, 147 in Looe, 115 (Mousehole), 43 Bicycling, 74–75 in Lostwithiel, 119 Market House Gallery Camel Trail, 3, 15, 74, in Newquay, 122–123 (Marazion), 48 84–85, 93, 94, 126 in Padstow, 126 Newlyn Art Gallery, Cardinham Woods in Penzance, 130–131 43, 49 (Bodmin), 94 in St Ives, 135–136 Out of the Blue (Maraz- Clay Trails, 75 self-catering, 25 ion), 48 Coast-to-Coast Trail, in Truro, 139–140 Over the Moon Gallery 86–87, 138 Active-8 (Liskeard), 90 (St Just), 45 Cornish Way, 75 Airports, 165, 173 Pendeen Pottery & Gal- Mineral Tramways Amusement parks, 36–37 lery (Pendeen), 46 Coast-to-Coast, 74 Ancient Cornwall, 50–55 Penlee House Gallery & National Cycle Route, 75 Animal parks and Museum (Penzance), rentals, 75, 85, 87, sanctuaries 11, 43, 49, 129 165, 173 Cornwall Wildlife Trust, Round House & Capstan tours, 84–87 113 Gallery (Sennen Cove, Birding,
    [Show full text]
  • Bus Services in Cornwall from 29Th March 2020 Welcome to Faqs
    Bus Services in Cornwall From 29th March 2020 Welcome to FAQs Sunday 29th March 2020 will herald the start of If my Operator has changed from First Kernow changes to local bus services across Cornwall. – can I still use the First Kernow ticket? Cornwall Council recently awarded an 8-year contract to Go Cornwall Bus (Plymouth Citybus/Go-Ahead) to Weekly tickets will be accepted until the 4th operate the whole of the county supported local bus April and monthly tickets to the end of April. network. This equates to around half of all bus journeys made in Cornwall. First Kernow will continue to operate “Bundle Tickets” purchased via mTicket will not be commercially within the county. honoured so please contact First for a refund. Services under contract to Cornwall Council will be branded as Transport for Cornwall. Many bus services If I have a different Operator for an inward previously operated by First Kernow will be run by journey than that for the outward journey, Transport for Cornwall. Go Cornwall Bus will be working will my Return Ticket be honoured? with three local operators, namely Hopley’s Coaches, OTS of Falmouth and Summercourt Travel Ltd, to provide the whole supported bus network. Transport for Cornwall services will accept the return ticket purchased on First Kernow buses. Transport for Cornwall is the partnership between Cornwall Council, Go Cornwall Bus and other local Currently, there are no arrangements for First transport providers delivering a high-quality, Kernow to accept return tickets purchased on integrated and customer-focused public transport Transport for Cornwall services.
    [Show full text]
  • Notice of Poll and Situation of Polling Stations
    NOTICE OF POLL AND SITUATION OF POLLING STATIONS CORNWALL COUNCIL VOTING AREA Referendum on the United Kingdom's membership of the European Union 1. A referendum is to be held on THURSDAY, 23 JUNE 2016 to decide on the question below : Should the United Kingdom remain a member of the European Union or leave the European Union? 2. The hours of poll will be from 7am to 10pm. 3. The situation of polling stations and the descriptions of persons entitled to vote thereat are as follows : No. of Polling Station Situation of Polling Station(s) Description of Persons entitled to vote 301 STATION 2 (AAA1) 1 - 958 CHURCH OF JESUS CHRIST OF LATTER-DAY SAINTS KINGFISHER DRIVE PL25 3BG 301/1 STATION 1 (AAM4) 1 - 212 THE CHURCH OF JESUS CHRIST OF LATTER-DAY SAINTS KINGFISHER DRIVE PL25 3BG 302 CUDDRA W I HALL (AAA2) 1 - 430 BUCKLERS LANE HOLMBUSH ST AUSTELL PL25 3HQ 303 BETHEL METHODIST CHURCH (AAB1) 1 - 1,008 BROCKSTONE ROAD ST AUSTELL PL25 3DW 304 BISHOP BRONESCOMBE SCHOOL (AAB2) 1 - 879 BOSCOPPA ROAD ST AUSTELL PL25 3DT KATE KENNALLY Dated: WEDNESDAY, 01 JUNE, 2016 COUNTING OFFICER Printed and Published by the COUNTING OFFICER ELECTORAL SERVICES, ST AUSTELL ONE STOP SHOP, 39 PENWINNICK ROAD, ST AUSTELL, PL25 5DR No. of Polling Station Situation of Polling Station(s) Description of Persons entitled to vote 305 SANDY HILL ACADEMY (AAB3) 1 - 1,639 SANDY HILL ST AUSTELL PL25 3AW 306 STATION 2 (AAG1) 1 - 1,035 THE COMMITTEE ROOM COUNCIL OFFICES PENWINNICK ROAD PL25 5DR 306/1 STATION 1 (APL3) 1 - 73 THE COMMITTEE ROOM CORNWALL COUNCIL OFFICES PENWINNICK
    [Show full text]
  • Patrieda Barn, Linkinhorne, Callington, Cornwall, PL17 7NA
    Patrieda Barn, Linkinhorne, Callington, Cornwall, PL17 7NA PHOTO PHOTO PHOTO PHOTO REF: LA00003721 Patreida Barn, Linkinhorne, Callington, Cornwall, PL17 7NA 2 Broad Street Launceston Cornwall PL15 8AD FREEHOLD Tel: 01566 777 777 Fax: 01566 775 115 E: [email protected] Large 3 bedroom farmhouse located near the edge of Bodmin Moor Situated within a 4 acre plot. Biomass heating Spectacular views of Sharp Tor and Caradon Hill Located on a quiet rural lane Offices also at: Exeter 01392 252262 Holsworthy 01409 253888 Bude 01288 359999 Liskeard 01579 345543 Callington 01579 384321 Callington 5 miles Launceston 10 miles Kivells Limited, registered in England & Wales. Company number: 08519705. Registered office: 2 Barnfield Crescent, Plymouth 21 miles Exeter 49 miles Exeter, Devon, EX1 1QT SITUATION Although in a quiet rural location, the property is no more than 5 miles slate hearth and shelving to chimney breast recesses. away from all amenities. The local primary school is 3 miles away at Upton Cross which also has a small grocery store and post office. and INNER HALLWAY Slate floor, doors to all downstairs accommodation and stairs leading Callington Community College is 5 miles away in Callington which also benefits from a health centre, Tesco superstore and petrol station, to first floor. Spotlighting, radiator and sliding door giving access various shops, pubs and sporting facilities including St. Mellion to:- International golf course and leisure facilities. UTILITY ROOM Room for various appliances, slate floor, double glazed window to front elevation and built-in shelving. BATHROOM PHOTO DESCRIPTION Low level W.C., panelled bath with mixer shower attachments, This is an impressive traditional stone built property set in a beautiful pedestal wash hand basin and obscure double glazing to front location with outstanding views over Sharp Tor and Caradon Hill.
    [Show full text]
  • Truro 1961 Repairs BLISLAND St
    Locality Church Name Parish County Diocese Date Grant reason BALDHU St. Michael & All Angels BALDHU Cornwall Truro 1961 Repairs BLISLAND St. Pratt BLISLAND Cornwall Truro 1894-1895 Reseating/Repairs BOCONNOC Parish Church BOCONNOC Cornwall Truro 1934-1936 Repairs BOSCASTLE St. James MINSTER Cornwall Truro 1899 New Church BRADDOCK St. Mary BRADDOCK Cornwall Truro 1926-1927 Repairs BREA Mission Church CAMBORNE, All Saints, Tuckingmill Cornwall Truro 1888 New Church BROADWOOD-WIDGER Mission Church,Ivyhouse BROADWOOD-WIDGER Devon Truro 1897 New Church BUCKSHEAD Mission Church TRURO, St. Clement Cornwall Truro 1926 Repairs BUDOCK RURAL Mission Church, Glasney BUDOCK RURAL, St. Budoc Cornwall Truro 1908 New Church BUDOCK RURAL St. Budoc BUDOCK RURAL, St. Budoc Cornwall Truro 1954-1955 Repairs CALLINGTON St. Mary the Virgin CALLINGTON Cornwall Truro 1879-1882 Enlargement CAMBORNE St. Meriadoc CAMBORNE, St. Meriadoc Cornwall Truro 1878-1879 Enlargement CAMBORNE Mission Church CAMBORNE, St. Meriadoc Cornwall Truro 1883-1885 New Church CAMELFORD St. Thomas of Canterbury LANTEGLOS BY CAMELFORD Cornwall Truro 1931-1938 New Church CARBIS BAY St. Anta & All Saints CARBIS BAY Cornwall Truro 1965-1969 Enlargement CARDINHAM St. Meubred CARDINHAM Cornwall Truro 1896 Repairs CARDINHAM St. Meubred CARDINHAM Cornwall Truro 1907-1908 Reseating/Repairs CARDINHAM St. Meubred CARDINHAM Cornwall Truro 1943 Repairs CARHARRACK Mission Church GWENNAP Cornwall Truro 1882 New Church CARNMENELLIS Holy Trinity CARNMENELLIS Cornwall Truro 1921 Repairs CHACEWATER St. Paul CHACEWATER Cornwall Truro 1891-1893 Rebuild COLAN St. Colan COLAN Cornwall Truro 1884-1885 Reseating/Repairs CONSTANTINE St. Constantine CONSTANTINE Cornwall Truro 1876-1879 Repairs CORNELLY St. Cornelius CORNELLY Cornwall Truro 1900-1901 Reseating/Repairs CRANTOCK RURAL St.
    [Show full text]
  • CORNWALL. [.I.Jlllly'
    1264. r.AB CORNWALL. [.I.JllLLY'. FARMERs-continued. Matthew Thos. Church town, Tresmere, Meager H.St. Blazey, Par Station R.S.O Martin John, Kingscombe, Linkinhorne, Launceston Meager S. St. Blazey, Par Station RS.O Callington RS.O Matthews Thomas & Son, Blerrick, MeagerTbos. Pengilly, St. Erme, Truro Martin J. Lanyon, Loscombe, Redruth Sheviock, Devonport Medland Mrs. Mary & Sons, Beer, MartinJ.Latchley,Gunnislake,Tavistock Matthews E.Mtdlawn,Pensilva,Liskeard Marhamchurch, Stratton R. S. 0 Martin John, Newton, Callington R.S.O l\Iatthews Mrs.E.Trannaek,Sncrd.Pnznc Medland Henry, Burracott,Poundstock, Martin J.Summercourt,Grampound Rd Matthpws Mrs.George Henry, Chenhale, Stratton R.S.O Martin John, Treneiage, St. Breock, St. Keverne, Helston Medland J. Combe, Herodsfoot, Liskrd )\Tadebridge RS.O Matthews Henry, Winslade, Stoke Medland Richard, Court barton, Mar- Martin J. Trewren, Madron, Penzance Climsland, Callington R.S.O hamchurch, Stratton R.S.O MartinJ.We. moor,Whitstone,Holswrthy Matthews Jas. Nancrossa, Carnmenellis, Medland Thomas, Crethorne, Pound- Martin John, Wishworthy," Lawhitton, Penryn stock, Stratton RS. 0 Launceston MatthewsJohn, Antony, Devonport Medland William, Whiteley, Week St. Martin John Lewis, Treneddon, Lan- Matthews John, Goongillings, Constan- Mary, Stratton RS.O sallos, Polperro RS.O tine, Penryn Medland William, Woodknowle, Mar- Martin In. Symons, Tregavetban, Truro Matthews John, ReJeatb, Camborne hamcburcb, Stratton RS.O Martin J. Albaston,GunnisJake,Tavistck Matthews John, Trendeal, Ladock, Medlen J.Coombe,Duloe,St.KeyneRS.O Martin Joseph, Carnsiddia,St.Stythians, Grampound Road Medlen John, Tbe Glebe, Duloe RS.O Perran-Arworthal R.~.O Mattbews In. Trevorgans, St. Buryan, Medlin M. Cbynoweth, MaOO, Pelll'yn Martin Joseph, Nanpean, St.
    [Show full text]
  • Cornish Archaeology 41–42 Hendhyscans Kernow 2002–3
    © 2006, Cornwall Archaeological Society CORNISH ARCHAEOLOGY 41–42 HENDHYSCANS KERNOW 2002–3 EDITORS GRAEME KIRKHAM AND PETER HERRING (Published 2006) CORNWALL ARCHAEOLOGICAL SOCIETY © 2006, Cornwall Archaeological Society © COPYRIGHT CORNWALL ARCHAEOLOGICAL SOCIETY 2006 No part of this volume may be reproduced without permission of the Society and the relevant author ISSN 0070 024X Typesetting, printing and binding by Arrowsmith, Bristol © 2006, Cornwall Archaeological Society Contents Preface i HENRIETTA QUINNELL Reflections iii CHARLES THOMAS An Iron Age sword and mirror cist burial from Bryher, Isles of Scilly 1 CHARLES JOHNS Excavation of an Early Christian cemetery at Althea Library, Padstow 80 PRU MANNING and PETER STEAD Journeys to the Rock: archaeological investigations at Tregarrick Farm, Roche 107 DICK COLE and ANDY M JONES Chariots of fire: symbols and motifs on recent Iron Age metalwork finds in Cornwall 144 ANNA TYACKE Cornwall Archaeological Society – Devon Archaeological Society joint symposium 2003: 149 archaeology and the media PETER GATHERCOLE, JANE STANLEY and NICHOLAS THOMAS A medieval cross from Lidwell, Stoke Climsland 161 SAM TURNER Recent work by the Historic Environment Service, Cornwall County Council 165 Recent work in Cornwall by Exeter Archaeology 194 Obituary: R D Penhallurick 198 CHARLES THOMAS © 2006, Cornwall Archaeological Society © 2006, Cornwall Archaeological Society Preface This double-volume of Cornish Archaeology marks the start of its fifth decade of publication. Your Editors and General Committee considered this milestone an appropriate point to review its presentation and initiate some changes to the style which has served us so well for the last four decades. The genesis of this style, with its hallmark yellow card cover, is described on a following page by our founding Editor, Professor Charles Thomas.
    [Show full text]
  • Liskeard & Caradon Railway Survey 2008
    Liskeard & Caradon Railway Survey 2008 Caradon Hill Area Heritage Project Caradon Ecology Countryside Management & Consultancy Liskeard & Caradon Railway Survey Caradon Hill Area Heritage Project……………………….. 3 Survey rationale…………………………………………..…. 3 Key aims of survey……………………………………...…… 3 A brief history of The Liskeard & Caradon railway….…... 4 Section reports…………………………………………….…. 6 Management recommendations………………………….... 16 Conclusions……………………………………………..….. 18 References……………………………………………….….. 18 Appendix 1 – Maps ……………………………………..……19 Survey and report carried out by Steve Payne, Caradon Ecology, July 2008. Funded by the Heritage Lottery Fund, South West Regional Development Agency, Cornwall County Council, Caradon District Council and local partners. Caradon Ecology 10 St Andrews Close Calstock Cornwall PL18 9RQ [email protected] 2 Introduction Caradon Hill Area Heritage Project The Caradon Hill Area Heritage Project is a Landscape Partnership Scheme managed by Caradon District Council and Cornwall County Council with support from the Heritage Lottery Fund and the South West Regional Development Agency. The Project covers an area of approximately 60 square kilometres from Liskeard north to Caradon Hill and Craddock Moor, including the villages of St Cleer, Minions, Pensilva and Upton Cross. The aim of the Project is "To conserve the Caradon Hill area’s landscape, and dramatically improve the accessibility, presentation and marketing of its heritage as a catalyst for community participation and sustainable local regeneration".
    [Show full text]
  • Gently Sloping
    LOCAL LANDSCAPE CHARACTER ASSESSMENT – NEIGHBOURHOOD PLANNING Carn Brea – Gently Sloping CHARACTER TYPE: DATE OF ASSESSMENT: T Gently Sloping 22/02/2021 t PARISH : Carn Brea ASSESSOR :Florence h MacDonald e Character Landscape reference guide Your landscape description Attribute Record your descriptive information for each heading Topography What is the shape of the land? - flat, shallow, steep, The land undulates gently in a broad basin between the steep slopes leading to Carn Brea and Four Lanes ​ uniform, undulating, upland, ridge, plateau respectively. Photo 1. and drainage ​ ​ Is there any water present? - estuary, river, fast ​ flowing stream, babbling brook, spring, reservoir, pond, Some water gathers in rainier weather with large puddles and marshy areas. The source of the Red River, which marsh follows the boundary of the Parish, is adjacent to Bolenowe.There are lots of gullies present along Cornish hedges that were used to manage the drainage of fields. Photo 2, 3 and 4. Near the flowing water is also more woodland ​ ​ which forms part of the county wildlife site Newton Moor. At the edge of the Parish boundaries there are also flood ​ ​ zones near rivers, particularly on the western side. see: Supporting documents/Appendices of maps/ 5. Flood zones 2&3. Supporting info OS Map; Cornwall Council mapping; aerial photographs Biodiversity What elements of the character could support There is a lot of natural coverage consisting of ferns, bracken, pockets of trees, with established Cornish hedges protected species (guidance from Cornwall Wildlife Trust providing the majority of field boundaries, interspersed with outcrops of granite. These are surrounded by/covered ​ CWT) with bracken, blackberries, brambles, and heather.
    [Show full text]
  • Rivendell Cottage, Caradon View, Minions, Liskeard, Cornwall Pl14 5Ll Offers in Excess of £400,000
    RIVENDELL COTTAGE, CARADON VIEW, MINIONS, LISKEARD, CORNWALL PL14 5LL OFFERS IN EXCESS OF £400,000 OPEN MOORLAND 1 MILE, LISKEARD 6 MILES, LAUNCESTON 10 MILES, LOOE AND THE BEACH 14 MILES Stunning moorland cottage with handsome granite elevations and moulded mullion windows, immediately adjacent to open moorland and with studio/annexe, parking and established gardens with fabulous views over the beautiful moorland landscape. About 1251 sq ft, Entrance Porch, 25' Sitting/Dining Room, 25' Kitchen/Breakfast Room, 4 Bedrooms (1 Ensuite Washroom/WC), Family Bathroom, Driveway Parking, Carport, 466 sq ft Studio Annexe, Pretty Gardens. LOCATION In an enviable setting on within the romantic landscape of Bodmin Moor, this setting is awash with scenic beauty and an abundance of wildlife. From the property one can observe stunning views over the beautiful countryside of South East Cornwall. The wide expanse of Bodmin Moor is immediately accessible and provides excellent opportunities for equestrians and those with outdoor interests. The property is situated on the outskirts of the popular village of Upton Cross, with amenities including a renowned primary school (rated "outstanding" by Ofsted) and a bus route which links the towns of Liskeard and Launceston. Nearby is the Caradon Inn public house and the internationally renowned Sterts open air theatre. Liskeard provides access to a substantial array of amenities including a main line railway station (Plymouth to London Paddington 3 hours). The University city of Plymouth is easily accessible and boasts a comprehensive range of premier retail outlets, entertainment and dining establishments set against the back drop of the historic waterside areas of The Hoe and the Barbican.
    [Show full text]
  • Trigg Major 7
    PRIEST IN CHARGE of THE PARISHES of SOUTH PETHERWIN, LEZANT, LEWANNICK and NORTH HILL, LAWHITTON and ALTARNUN with BOLVENTOR AND TEAM VICAR of LAUNCESTON 1 CONTENTS Le+er from the Bishop of Truro 3 Diocese of Truro 4 Archdeaconry of Bodmin 5 Le+er from the Rural Dean 6 Deanery of Trigg Major 7 Geographical Area 8 The Benefice 12 The Rural Parish Profiles 14 The Churches of Launceston Parish 19 Time and Distance around the Parishes 22 Person SpecificaNon 23 Schools 25 StaNsNcs 27 Housing 32 A Prayer 33 2 THE BISHOP OF TRURO The Right Reverend Philip Mounstephen In this Diocese of Truro we are deeply commi+ed to following what we call ‘The Saints’ Way’. We see ourselves as part of a story of the grace of God, made manifest in Cornwall, which stretches back many hundreds of years, possibly to the very earliest days of the ChrisNan faith. It’s a story that calls us on into the future too, in loving mission, ministry and service. As we follow ‘The Saints Way’ we will be deeply commi+ed to Christ and to all that he calls us to be and to do; and to Cornwall, this very special place with its own parNcular culture, history and idenNty. We can only follow that Way faithfully if we see it as our corporate calling, as the body of Christ. So we encourage ministers of the gospel to come and join us here who are commi+ed to seng the whole people of God free in their God-given calling, to make Christ known here in Cornwall, today.
    [Show full text]