Carbonate rocks, that is limestones and dolomites, are a feature of the sedimentary record, right back to the oldest strata (~4200 Ma old). Common types are skeletal-bioclastic-reefal limestones, oolites (like the Bath stone) and microbialites (like the Cotham Marble). Although the roles of bacteria are well known in the formation of stromatolites, totally ignored is the possibility that viruses may be involved in limestone deposition. Viruses are everywhere, in greater abundance than bacteria, but dependent upon them. New evidence from modern microbial mats and from lab experiments is showing that viruses can be permineralised and can influence carbonate precipitation. Could viruses provide the seeds for limestone formation? This talk explores the potential role of viruses in carbonate precipitation. Viruses are the new frontier in Earth Science……
Hydrocarbon exploration and production are experiencing crucial changes at the moment, as environmental aspects are becoming more important as the world's population continues to grow. The planet will host some 9 billion people at the end of the 21th century, with most of the population growth occurring in developing countries. Hence, the way oil and gas is used, at present, will change dramatically in this Century so that we can curtail CO2 emissions (and atmospheric pollution) while tackling energy poverty. This talk will present some interesting geological facts from the largest oil and gas fields in the world. It will show how these fields are being exploited in an ever more sustainable way. The examples provided will illustrate how governments, industry and the public are investing in new technologies and approaches to energy production.
Hydraulic fracturing, or fracking, for shale gas has become an issue of significant public debate. In this talk I will chart the history of this often poorly-understood technology, from the original well-shooters of the 19th Century, through to modern-day shale gas developments.
Luminescence dating is amongst the most versatile of geological chronometers. Drawing on ubiquitous, resilient datable material it can estimate the age of sedimentary events and heated archaeological artefacts spanning c. 10 to >105 yrs. This talk will outline the principles of this technique and instances where it has played a central role in uncovering past climate change and the evolution and dispersal of Hominins.
People live on continents. We take them for granted, but we’d be a bit stuck and rather wet without them. To a first approximation, continents are made of granites and rocks derived from granite. Granites are wonderful things, defined by a disconcertingly simple mineralogy that disguises a bewildering array of genetic options. It is important to understand the relative importance of these so that, ultimately, we can understand our own home.
The discussion of granite petrogenesis has a long history, from the days of granitisation vs. magmatism, through the paradigm of S- (sedimentary) and I- (igneous) type granites, to an alphabet soup of SIAMese siblings and the recent acceptance that some (by no means all, but yes, some!) granites can be largely juvenile: directly mantle-derived.
This talk will explore the different mechanisms for the formation of the same thing and the different methods for finding this out. It will then highlight recent work on juvenile granites that may represent unrecognised long-term crustal growth, with attendant implications for the evolution of the planet (well, bits of it anyhow…).
A central research theme in the field of Quaternary Science today relates to the question of whether high-magnitude and abrupt (millennial to decadal scale) shifts in climate occurred synchronously or asynchronously across the globe. The importance of deciphering this lies in its ability to help us understand how our climate system operates.
By investigating palaeoenvironmental archives which preserve long records of past climate fluctuations, we can more accurately assess and model how our climate system is likely to respond to future changes. Polar ice-cores provide a record of past climatic change at annual resolution. These records, however, are remote from the major populated land masses, located predominantly in the temperate latitudes. Attempts to identify whether variability exists in the expression of abrupt climate change at different latitudes are hampered by uncertainties in the timing of events, as measured through traditional chronological techniques (such as radiocarbon dating). Thus, annual records of climate recorded in palaeolake basins (akin to tree rings) provide us with an opportunity to address this challenge as they are one of very few terrestrial archives of environmental change which have the ability to provide data at a resolution comparable or better than that of the polar ice cores. Consequently, they are a key archive for assessing the spatial and temporal differences in regional environmental responses to changing climates.
This talk will outline current research on this theme and will draw on examples from the UK and Sweden. It will also discuss how these records can be linked together using time- synchronous markers, such as volcanic ash layers, which allow leads and lags in the climate system to be assessed whilst circumventing the uncertainties of some more traditional chronological techniques.
Learn how dinosaur remains are found and excavated, and how palaeontologists read the details of dinosaurs’ lives from their fossils - their colours, growth, and even whether we will ever be able to bring them back to life.
Leading palaeontologist Michael Benton explains how the study of dinosaurs has transformed into a true scientific discipline. New technologies have revealed secrets locked in prehistoric bones that no one could have previously predicted. We can now work out the force of dinosaurs’ bite, their top speeds, and even how they cared for their young. Remarkable new fossil discoveries - giant sauropod dinosaur skeletons in Patagonia, dinosaurs with feathers in China, and a tiny dinosaur tail in Burmese amber - remain the lifeblood of modern palaeobiology. Thanks to advances in technologies and methods, however, there has been a recent revolution in the scope of new information gleaned from such fossil finds. Michael will trace the development of the study of dinosaurs from its roots in antiquated natural history to an indisputably scientific field, and explain why, though extinct, dinosaurs are still very much a part of our world.About the speaker
Michael J. Benton is Professor of Vertebrate Palaeontology at the University of Bristol and the author of The Dinosaurs Rediscovered: How a Scientific Revolution is Rewriting History. His many previous books include standard reference works, textbooks, and popular books on dinosaurs and the history of life.