7-9 March 2001

OrangeEx-Services Club Ltd

231 242 Anson Street



The Australian Geodynamics Cooperative Research Centre(AGCRC), Geological Survey of New South Wales (GSNSW), Australian GeologicalSurvey Organisation (AGSO) and Fractal Graphics will hold a 3 day workshop topresent results of their recent work in the Eastern Lachlan Orogen.


The core of the workshopwill be a discussion of the results of the deep seismic reflection andrefraction data, collected in 1997 and 1999, designed to shed light on crustalarchitecture of different belts of Ordovician volcanics, volcaniclastics andintrusives that form part of the Macquarie Arc. This arc was disrupted duringSilurian and Devonian extension and by later contraction. The work was alsodesigned to contribute to the understanding of the geodynamic setting of someLachlan Orogen mineral systems. North-south and east-west seismic data wereacquired across the Molong volcanic belt north and south of Orange; andeast-west lines were acquired across the Junee-Narromine volcanic belt south ofLake Cowal, and several kilometres north of the Gidginbung deposit.


Other topics to be covered will includeaspects of the regional geology, gravity and magnetic modelling, worming of potential field data, building of a 3D geological model for the region, andsome results of Ar Ar dating of deformational events.




Outline of the Project R Korsch (AGSO)

Geological issues in the Eastern Lachlan Orogen RGlen (GSNSW), O Raymond and P Lyons (AGSO)

Capabilities of Seismic in Hard Rock Terranes L Jones(AGSO)

Acquisition of Seismic and Processing: An introduction L Jones (AGSO)

Time-Space Plot and PREDICT A Cross (AGSO)

The Seismic Refraction Transect D Finalyson (AGSO)et al

Presentation of the 1997 Seismic Data andInterpretations R Korsch (AGSO), R Glen (GSNSW) et al

Presentation of the 1999 Seismic Data andInterpretations R Korsch (AGSO), R Glen (GSNSW) et al

Gravity Signature of Eastern Lachlan Plutons PLennox (UNSW)

Gravity and Magnetic Modelling N Direen (AGSO)

3D Models of Eastern Lachlan N Archibald (FractalGraphics) et al

·Worming ofthe gravity and magnetic data

·Building the3D geological model

Siluro-Devonian Extension: Jemalong Trough O Raymond(AGSO)

Ar-Ar Dating of Deformational Events R Glen (GSNSW)et al

Mineral Systems Implications in the Eastern Lachlan P Lyons (AGSO) et al

New Products on Forbes Sheet P Lyons (AGSO)

GSNSW Future Directions T Tyne (GSNSW)


FIELD TRIP FRIDAY, 9 MARCH 2001 (8.00 AM 3.00PM)


The workshop will be followed by aone-day field trip on Friday, 9 March. The field trip will probably be in thevicinity of seismic line 97AGSEL2 to the east of Orange, and we will examinethe geological units in this area that were crossed by the seismic lines.Seismic line 97AGSEL2 crossed the Mumbil Shelf, the Godolphin Fault and thewestern part of the Hill End Trough, and ran to the north of the Lewis Pondsdeposit.






7-9MARCH 2001

Ex-Services Club, Orange, NSW

(One person per registration form)


(Title)  First Name:                                        Surname:                                                        


Position:                                                        Badge Name:                          ____    ______








Telephone:                                                               Facsimile:                                            




Please register me for the Eastern LachlanWorkshop to be held in Orange, NSW.          .              


(Signature accepting registration)                                                              Date:                                    


Payment Details:

Registration for Workshop is $110 perperson (includes GST). 

Registration for bonafide students wishingto attend is $55 (includes GST).

(Registration includes abstract volume,lunches and morning and afternoon teas)

Field Trip is an additional $49.50(includes GST). This includes coach travel and lunch.


I wish to pay by:


    Cheque        (ChqAmount)      .     $                                                           (payable to AGSO)


    Bankcard / Mastercard / Visa / AmericanExpress   (please circle)


          (number)                                                                                                Expiry Date                  /      /      .


          (nameon credit card)                                                                          


          (signature)                                                                                                  Amount            $                 .



Head of Department to sign that aboveperson is a bonafide student.


Signature                                                                                      Institute                                                                





Please send this form to the workshopsecretariat at the address below.


Eastern Lachlan WorkshopSecretariat

C/-Russell Korsch, AGSO, PO Box 378, Canberra, ACT, 2601.

Ph:02 6249 9495,    Fax: 02 6249 9971,    E-mail: