Basalt colour

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Transcript


This is a transcript of a QuickTime movie (3.3 MB) recorded in the Pilbara in 2005. Dr Martin Van Kranendonk, a geologist with the Geological Survey of Western Australia, discusses the colour of the basalt near Marble Bar.

Transcript:

This is the basaltic lava sequence that underlies the Marble Bar Chert. Now what’s nice about this outcrop, and important to realise in terms of the arguments that are going to come later about chert, is that this is the normal colour of a metamorphosed basalt - brown weathering skin but greenish overall. All right? That’s the normal colour. Now when we pass hot silicious fluids, that will change colour. We’ll see that in a couple of outcrops, it’s critical.

Contents


Introduction

Context

Early Life

Evidence

Acknowledgements

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