Learning Outcomes:
On completion of this module students should be able to:
1. Read and interpret topographic and geological maps.
2. Visualize the geological structure in three dimensions.
3. Use a field notebook to keep an accurate record of field observations and measurements.
4. Recognize and identify selected rock types and minerals and understand their mode of formation, economic importance and practical application.
5. Understand selected aspects of the geological history of Ireland.
6. Understand the evolution of the Irish landscape.
7. Understand how to construcy a geological map
Indicative Module Content:
LECTURES:
Lecture 1: Introduction and logisitics.
Location of the field area; safety and adequate field clothing; topics to be covered on the class; methods of assessment; collection of personal and health data; distribution of safety information.
Lecture 2: Geological Maps and grid references.
Different styles of geological map; concepts of geological time and stratigraphy; geological timescale; lithology and stratigraphy on maps. Grid references; map scales and precision. How treasure hunts can go wrong. Practical map exercise on Geological Survey maps of eastern and northern Ireland designed to locate places relevant to the class and to answer specific questions about the geology and to encourage the use of grid references and an awareness of scale.
Lecture 3: Geological History of Ireland I.
Plate tectonics for 3200 million years, supercontinents, rifting and orogeny. The oldest (c. 1790 million years) rocks in Ireland. The formation and break-up of the Rodinia Supercontinent (from 1 billion years ago) and the evidence in Ireland. Stratigraphy as a record of environmental change and crustal evolution. Neoproterozoic glaciation. The opening and closing of Iapetus – the Grampian Orogeny and the suturing of “Ireland” during oblique Caledonian collision. Magmatism and heat after orogeny – how we can explain granites.
Lecture 4: Geological History of Ireland II.
Devonian palaeogeography, palaeobiology and climate; evidence for changing sea level – the Carboniferous flood; Carboniferous coals and base metal ores. Variscan orogeny and the assembly of the Pangea Supercontinent. Triassic deserts and the Corrib Gasfield. Jurassic sea level, abortive rifting and hydrocarbons. Cretaceous climate and sea level. Early Cenozoic mantle plume and rifting. Quaternary glaciation. The tectonic (and climatic) future.
Lecture 5: Description and interpretation of rocks in the field (part 1).
Introduction to the common rock-forming minerals and their identification. Mineral identification. Rocks as mineral aggregates. The rock cycle. Types of igneous rocks; their recognition and formation. Types of igneous rock bodies.
Lecture 6: Description and interpretation of rocks in the field (part 2).
Observation and interpretation of sedimentary rocks in the field. Interpretation of paleo-environments from the grain size and texture of sedimentary rocks. Modes of sediment transport and deposition. Sediment provenance. Introduction to metamorphic processes.
Lecture 7: Fieldtrip preparation and the compass clinometer.
Final preparation for the fieldtrip to Antrim. Maps, projections and magnets. Magnetic declination and navigation. Dip and strike and how to measure them. Indoor mapping and measuring (practical) exercise with the compass clinometer.
FIELD CLASS:
The field class is a full 5 days fieldwork. The class is conducted as a residential field trip along the north coast of Antrim in Northern Ireland. The itinerary will be:-
Day 1: Portraine.
Day 2: Portrush.
Day 3: Ballycastle North Star Bay.
Day 4: Giants Causeway and Ballintoy Harbour
Day 5: Cushendall.
NOTE: While the fieldtrip is heavily subsidized by the school, there is a cost associated with the trip of 150 euros to help cover accommodation and coach hire.