First circular

 

 

Field workshop 8-12th July 2001 on

Ilmenite Deposits in the

Rogaland Anorthosite Province

 

 

 

You are hereby cordially invited to a field workshop on anorthosites and associated ilmenite deposits in the Rogaland Anorthosite province, S. Norway 8-12nd July 2001. The workshop is organised by the working group for the project Ilmenite deposits in the Rogaland Anorthosite province (http://www.ngu.no/prosjekter/Geode/index.htm), a subproject under the ESF’s GEODE-project "The Fennoscandian Shield Precambrian Province".

 

The workshop will include lectures by recognized experts, posters, discussions and field excursions and will be held at Lundheim Folkehøgskole at Moi 110 km SE of Stavanger. Moi can be reached by train, bus or car. It is recommended that people coming from abroad arrive on the evening of Saturday 7th July in order to be in time for the start of the meeting. Transport will be arranged from Stavanger airport to Moi.

 

Please distribute this information to anyone that you think might be interested.

 

 

THE GEODE - FENNOSCANDIAN SHIELD

(INCL. GREENLAND AND UKRAINE) PROJECT

 

   GEODE is a European research programme under the auspices of the European Science Foundation to build a quantitative understanding of the geological processes that result in world-class ore deposits.

   Although mining is ongoing and vital, Europe is a net importer of metals. A European research initiative on ore deposit evolution would lead to a better understanding of the geodynamic prerequisites to the formation of world class ore deposits in Europe. This will strengthen Europe´s role as an important producer of metals and also lead to better long-term use of natural resources on the European continent.

   Mining in the Fennoscandian shield has a long tradition, going back to medieval times. In the Nordic countries mining has been, and still is, one of the key factors for the economic success of the countries. By bringing research groups together under the GEODE-umbrella we seek to improve co-operation and the generation of innovative and challenging ideas on ore genesis in the Fennoscandian shield. We intend to communicate and cooperate closely with the mining and exploration industry to ensure that new ideas and inferences applicable on exploration and mining are implemented as rapidly as possible.

   In the Fennoscandian shield the GEODE-programme aims at understanding the geodynamic processes that resulted in world-class deposits within different Precambrian tectonic environments.

  

Additional information regarding GEODE is found on the homepage http://www.gl.rhbnc.ac.uk/geode/.

 

AIMS OF THE WORKSHOP

 

The aims of the field workshop are to bring together earth scientists interested in:

-     The evolution of the Rogaland anorthosite province as well as massif-type anorthosites in general

-     The metallogeny of titanium deposits

-     The relationships between the genesis of the various types of mineral deposits in the Rogaland anorthosite province and the overall geological evolution of the province

-     The world class Tellnes ilmenite deposit; its geology and economic significance

-     Identification of unresolved petrogenetic problems

 

We want especially to encourage people to bring recent results for open discussion on these topics. We also wish to encourage initiatives to establish new multinational research groups on any topic relevant to the overall aims of GEODE and the Fennoscandian Shield project.

 

 

THE ROGALAND  ANORTHOSITE PROVINCE  AND THE TELLNES ORE  DEPOSIT

 

The Rogaland anorthosite province occupies an area of 1200 km2 and is characterised by massif-type anorthosites and a large layered jotunite (Fe-Ti-P-rich hyperstene diorite) body, the Bjerkreim-Sokndal intrusion. It occurs in the Proterozoic Sveconorwegian Province, generally correlated with the Grenville Province in North America, where voluminous anorthosite massifs occur together with several of the largest ilmenite and titanomagnetite deposits in the world.

   Two major parental magmas have been invoked to explain the anorthosite suite: a high-alumina basaltic magma that has given rise to the massif-type anorthosites, and a jotunitic magma that has differentiated with major country rock assimilation into the Bjerkreim-Sokndal layered series of anorthosite/leuconorite, norite, gabbronorite, mangerite and granitoids (igneous charnockites).

   The massif-type anorthosites result from diapiric emplacement of a plagioclase crystal mush which crystallized over a large P-T interval. Except for the Tellnes ilmenite deposit, which is related to a later ilmenite-norite dyke, the Fe-Ti deposits in the anorthosite massifs have been deformed during diapiric emplacement.

   The magmatic activity took place between 932 and 920 Ma., 50-60 Ma after the last major regional deformation. The anorthosites have thus escaped tectonic reworking and metamorphism, in sharp contrast to many North American occurrences. Thus they provide a special opportunity to study primary relationships between anorthosites and ilmenite deposits, and to address the geodynamics of anorthosite magmatism in general.

   Ti-Fe oxide deposits are widespread in the province, and are found as ilmenite- and magnetite-rich cumulates in the Bjerkreim-Sokndal intrusion, and as a variety of ilmenite - magnetite rich bodies in anorthosite.

   Tellnes is the largest titanium deposit in Europe and probably the largest titanium deposit in production in the world today. The ore reserves are 380 million tons averaging 18 % TiO2 of which approx. 15% TiO2 is as ilmenite (30% ilmenite) and 3 % of the TiO2 is within other minerals. An additional 250 million tons of ore has been identified at depth. The Tellnes ilmenite reserve (57 mill. t. contained TiO2) represents 14% of the world reserves of ilmenite, equivalent to 12 % of the total (ilmenite + rutile) world reserves of titanium minerals. The yearly production, approx. 550.000 t ilmenite concentrate averaging 44.5 % TiO2 in 1999, is 5% of the total yearly production of titanium minerals (in terms of contained TiO2) in the world.

 

 

ORGANISING COMMITTEE

 

Jean-Clair Duchesne: Fieldtrip anorthosites and Ti deposits, geological guidebook.         Email: jc.duchesne@ulg.ac.be Postal address: Jean-Clair Duchesne, Bât. B20 Pétrologie et géochimie, boulevard du Rectorat, 15, 4000 Liège Belgium;

Brian Robins: Fieldtrip Bjerkreim-Sokndal layered intrusion. Email: brian.robins@geol.uib.no Postal address: Brian Robins, Department of Geology, Allégt. 41, 5007 Bergen - University, Norway 

Richard Wilson: Fieldtrip Bjerkreim-Sokndal layered intrusion. Email:  JRW@geo.aau.dk

Are Korneliussen: Workshop. Email: are.korneliussen@ngu.no  Postal address: NGU, N-7491 Trondheim, Norway.

Tove Aune: Workshop and registration. Email: tove.aune@ngu.no  Postal address: Tove Aune, NGU, N-7491 Trondheim, Norway.

 

 

PROGRAM

 

The main topics of the workshop will be (1) The geology of the Rogaland anorthosite province. (2) Ilmenite deposits in the Rogaland anorthosite province with particular focus on the world-class Tellnes deposit. (3) Fe-Ti oxide petrogenesis. We would also encourage contributions (lectures and/or posters) from comparable geological environments elsewhere in the world. Invited lectures, oral presentations and posters sessions will be organized.

 

Sunday 8th July: Workshop sessions

     09.00-12.00: The geology of the Rogaland anorthosite province

     12.00-13.00: Lunch

     13.00-17.00: Ilmenite deposits in the Rogaland anorthosite province with particular

  focus on the Tellnes deposit.

 

Monday 9th July: Field trip to anorthosites in the western part of the Rogaland province and some of the associated titanium deposits. A number of localities will be visited, showing typical geological relations in anorthosite diapirs including orthopyroxene and plagioclase megacrysts, inclusions of deformed leuconorite in anorthosite, small (hemo-)ilmenite deposits (Kydlandsvatn) and a nelsonite showing (Hestnes) in the deformed margin of a diapir, and a Ni-deposit (Homsevatn) in a late norite pegmatite.

 

Tuesday 10th July: Field trip to the Bjerkreim-Sokndal Layered Intrusion.

Focus will be on the characteristics of the various megacyclic units in relation to the evolution of the magma chamber by fractional crystallisation, magma recharge, hybridisation and assimilation of country rocks. Of particular interest from the mineral resource point of view are the observations of how and where apatite, ilmenite with low MgO contents and titanomagnetite with high V-contents occur in the layered series.

 

Wednesday 11th July: Field trip to ilmenite deposits in the Sokndal area including the Tellnes

deposit. The Fe-Ti deposits display a range of complexity and include monomineralic massive ilmenite deposits in anorthosite, plagioclase-ilmenite dykes, layered norites and oxide- and apatite-rich gabbronorites. The continuum is important as it points to a common genesis of the deposits, and almost all major types will be visited.

 

Thursday 12th July: Workshop sessions.

     09.00-12.00: Fe-Ti oxide petrogenesis. The role of anorthosite provinces and layered

                           intrusions. Relationships between Fe-Ti deposits and the evolving earth.

12.00-13.00: Lunch

13.00-15.30: Identification of unresolved petrogenetic problems related to Fe-Ti deposits

   and anorthosite provinces. Open discussions.

     15.30-16.30: Dinner. Final remarks. End of the workshop.   

 

Note that the workshop is intended to be informal. We anticipate that each presentation as well as other related or relevant topics will be discussed among all participants in a relaxed and informal manner. We would also like to have industry representatives to give their view on these topics as well as suggesting guidelines for how they think future research activities should be directed in order to benefit the mining and exploration industry.

COST AND REGISTRATION

 

The registration fee for the field workshop is

-        Alternative 1: NOK 4100 for single room accommodation

-        Alternative 2: NOK 3700 for accommodation in double room

-        Alternative 3: NOK 3200 for accommodation in double room using your own sleeping bag.

 

The registration fee covers

-        transport from Stavanger airport in the evening Saturday 7th July

-        full accommodation at Lundheim Folkehøgskole at Moi from Saturday evening till the end of the workshop in the afternoon Thursday 12th July.

-        transportation during the field trips.

-        transport back to Stavanger airport at the end of the workshop in the afternoon/evening Thursday 12th July.

 

It is possible to stay overnight at Lundheim Folkehøgskole until Friday 13th July at an additional payment of approximately NOK 400 (single room).

 

For registration please fill in the enclosed registration form and send it to Tove Aune by e-mail (tove.aune@ngu.no), fax (+47-73921620) or by post (N-7491, Trondheim, Norway) no later than 1st February 2001. We will then send you an invoice for your payment of the registration fee. No refunds will be given for cancellations received after June 1st.

 

 

DEADLINES

Second circular:                           1st January 2001

Registration:                                 1st February 2001

Submittal of abstract:                   28th February 2001

Payment of registration fees:        15th May 2001
   (invoice will be sent from NGU in the beginning of April)

 

Registration form

 

ABSTRACT AND PUBLICATION POLICY

Abstracts should be submitted electronically to Tove Aune (tove.aune@ngu.no) as well as by hard copy (postal address: Tove Aune, NGU, N-7491 Trondheim, Norway) before 28th February 2001. Required character: Times New Roman - 12. There is no limitation on the text length and people are encouraged to submit illustrations and tables together with the abstract.

 

A new geological guidebook (editor Jean Clair Duchesne) will be available at the meeting in the form of a NGU report.

 

We are considering a conference publication in which participants in the workshop can publish their contributions.