7th National Opal Symposium

Slides:

Advertisements

Similar presentations

Geology & Groundwater Origins

Advertisements

Soil The product of weathering of rocks

Please after you modify this program be sure to use save as… and not save.

Landscapes Shaped by Stream Erosion

Unit 1 Lesson 5 Soil Formation

Warm Up The igneous rock texture that is characterized by two distinctly different crystal sizes is called ____. a. porphyritic texture c. fine-grained.

GEOL 1307 Physical Geology Exercise #6 Sedimentary Rocks.

Sedimentary Rocks Section 3.3.

GEOLOGY OF DEVILS TOWER NATIONAL MONUMENT Sedimentation Pat Frolander John Aloisio Marlon Poole Lee McDowell.

Vocabulary  Topography: The landscape of a place  Precipitation: The process of forming rock from a solution through evaporation.

Geology Of Wind Cave The. As humans, we are constantly trying to understand the world around us. Wind Cave is one of many geological wonders found on.

The Grand Canyon A water created landform. The WOW Factor.

GY403 Structural Geology Lab

Canyons, Karoo Landscapes and Scarp Retreat

SCT Operations Investigation into Abnormal Subsidence above a Longwall Panel in the Southern Coalfield, Australia Winton Gale Managing Director SCT Operations.

DO Now: You find a sedimentary rock that has one graded bed. Describe how you know which layer of the graded bed is formed last?

The History of Opal. Throughout the centuries opal has been prized and found in many countries.

Drainage Basin Part I Morphological Systems. Contents Drainage Basin Cycle Stream Characteristics Stream channel Stream flow Hydrograph Fluvial Morphology.

Guided Notes about Weathering

Weathering and soil formation – section 2-1 Rocks and Weathering

Chapter 6 Weathering and Soil

Landforms change by processes A process is the act of doing or making something by following a set of steps Example of a process.

BY DYLAN MORTON MINTABIE OPAL MINING It is 268km from Coober Pedy. As in many other part of South Australia, Aborigines were reportedly the first people.

Honors 1360 Planet Earth Last time: Obs : Volcanism at plate boundaries Obs : “Normal” geotherm < melt temperature Hyp : Volcanism in rift zones  geotherm.

Table of Contents Title: Formation of Sedimentary Rocks, Sedimentary Features Page #: 38 Date: 11/29/2012.

Sedimentary Rocks I. Formation of Sedimentary Rocks

Do Now 10/8/13 1.Which type of crust is more dense? 2.What type of luster would a diamond have? 3.List four agents of erosion. 4.What is deposition?

SOIL DEVELOPMENT AND EROSION. Soil Soil is a combination of mineral and organic mater, water, and air Soil is a combination of mineral and organic mater,

Click letters to view pictures B H I J Click here to view the cross section A – A’ C D E J I F G A Click to End Show.

Understanding Soil.

Bell Ringer What type of rock is formed when you melt a rock (magma or lava) and then cool it?  Igneous  Sedimentary  Metamorphic.

CHEMICAL WEATHERING. Starter Activity Write down the following questions and wait Silently for the video to start. 1. What is chemical weathering……. (Give.

Landscapes A landscape is a region on Earth’s surface. (See p. 2 of your reference table)

Earth Systems and Resources

Use of Geologic Maps and Structural Geology to locate an oil well.

Laterization Effect of Tropical Soils

Sedimentary Rocks. Where do sedimentary rocks come from? Can you think of an example of sedimentary rock? What processes are involved in the formation.

HOW DOES SOIL FORM? GLOBE NY Metro, 2008.

Sedimentary and Metamorphic rocks Chapter 6 page 120

Chapter 2 Lesson 2 SOIL.

University of Technology, Sydney

Lecture 5: Weathering and Soil Formation

Chapter Weathering, Erosion, and Soil

Soil Formation Unit 2 lesson 5 Soil Formation

Grade 11 Geomorphology Canyons, Karoo Landscapes and Scarp Retreat.

Ecoregions in Texas youtube. com/watch

SEDIMENTARY ROCKS.

Ch. 7 Sec. 3 Formation of Soil.

The Dirt on Soil Copyright © Houghton Mifflin Harcourt Publishing Company.

Ch 5 Weathering, soils, and erosion

Layer Thickness and Map Width

Ground Water Chemical Weathering

Sedimentary rocks Geology 115.

8th Grade: The Dynamic Earth (Module E)

3.3 – Sedimentary Rocks.

The Geology Of Wind Cave.

Quiz Based on Reading of pages

Rock and Mineral collection

SEDIMENTARY ROCKS.

Learning Objective: I will be able to explain deposition of particles in water.

28.3 Interactive Notes DO NOT COPY THIS SLIDE

Geologic Cross-Sections

by Alan M. Roberts, Nick J. Kusznir, Graham Yielding, and Hugh Beeley

Rates of weathering are impacted by 3 things…

Unit 1 Lesson 5 Soil Formation

Take a moment and study this photograph carefully

Illuminated 3D perspective displays (with 7

Presentation transcript:

7th National Opal Symposium “Unlocking Australia’s Opal Wealth” OPAL DOMES 7th National Opal Symposium Lightning Ridge 25-27 July 2011 David Horton

AUSTRALIAN OPAL MINING CENTRES

east Early west Late 80 90 110 120 130 CRETACEOUS 100 Kumbarilla Beds Bungil Formation Griman Ck Formation ** Surat Siltstone Doncaster Member ** Coreena Member Mackunda Formation ** These units host precious opal Cadna-Owie Formation Winton Formation ** Allaru Mudstone Toolebuc Formation Bulldog Shale ** Wallumbilla Formation Schematic cross-section showing opal-bearing geological units

24 Ma 60 Ma fresh host rocks silcrete chemically weathered host rocks 20 km Stage 2: Arid sub-tropical climate; lowering of alkaline water table during warping; remobilisation of silcrete; opalisation Stage 1: Wet temperate to sub-tropical climate; high acidic water table; chemical weathering of sediments; pedogenic silcrete 60 Ma 24 Ma later sediments opalisation

10 Ma - present Opal horizon Stage 3: Scarping 20 km Note: Vertical scale is highly exaggerated

AUSTRALIAN SEDIMENTARY OPAL – WHY IS AUSTRALIA UNIQUE? Australian Gemmologist, 21, 287-294 Published December 2002

Shuttle Radar Topography Mission Specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February 2000

WINTON DOME Length: 90 km Width: 40 km

JUNDAH DOME Length: 145 km Width: 70 km

EROMANGA DOME Length: 145 km Width: 45 km

GRAWIN - GLENGARRY DOME LIGHTNING RIDGE DOME Length: 30 km Width: 30 km Length: 45 km Width: 45 km

ANDAMOOKA ?DOME Length: ?? km Width: 20 km

COOBER PEDY ?DOME Length: 100 km Width: +40km