Institution
British Geological Survey
Government•Nottingham, United Kingdom•
About: British Geological Survey is a government organization based out in Nottingham, United Kingdom. It is known for research contribution in the topics: Groundwater & Aquifer. The organization has 2561 authors who have published 7326 publications receiving 241944 citations.
Topics: Groundwater, Aquifer, Glacial period, Groundwater recharge, Holocene
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors studied the previously unmapped Bolivian sector of the Central Brazil Shield, ∼220 000 km in area, during an Anglo-Bolivian technical co-operation programme.
122 citations
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TL;DR: In this paper, the authors used U-Pb, Hf, and O analysis of detrital zircons from sedimentary successions deposited during the ∼1.3-1.1 Ga accretionary, ∼ 1.1-0.9 Ga collisional, and < 0.5 Ga extensional collapse phases of the Grenville orogenic cycle in Labrador and Scotland.
Abstract: Detrital zircons from modern sediments display an episodic temporal distribution of U-Pb crystallization ages forming a series of ‘peaks’ and ‘troughs’. The peaks are interpreted to represent either periods of enhanced generation of granitic magma perhaps associated with mantle overturn and superplume events, or preferential preservation of continental crust during global collisional orogenesis. The close association of those peaks with the assembly of supercontinents implies a causal relationship between collisional orogenesis and the presence of zircon age peaks. Here these two end-member models (episodic periodicity of increased magmatism versus selective preservation during collisional orogenesis) are assessed using U-Pb, Hf, and O analysis of detrital zircons from sedimentary successions deposited during the ∼1.3–1.1 Ga accretionary, ∼1.1–0.9 Ga collisional, and < 0.9 Ga extensional collapse phases of the Grenville orogenic cycle in Labrador and Scotland. The pre-collisional, accretionary stage provides a baseline of continental crust present prior to orogenesis and is dominated by Archean and Paleoproterozoic age peaks associated with pre-1300 Ma Laurentian geology. Strata deposited during the Grenville Orogeny display similar Archean and Paleoproterozoic detrital populations along with a series of broad muted peaks from ∼1500 to 1100 Ma. However, post-collisional sedimentary successions display a dominant age peak between 1085 and 985 Ma, similar to that observed in modern North American river sediments.
Zircons within the post-orogenic sedimentary successions have progressively lower ɛHf and higher δ18O values from ∼1800 to ∼1200 Ma whereupon they have higher ɛHf and δ18O within the dominant 1085–985 Ma age peak. Furthermore, the Lu-Hf isotopic profile of the Grenville-related age peak is consistent with significant assimilation and contamination by older crustal material. The timing of this dominant age peak coincides with the peak of metamorphism and magmatism associated with the Grenville Orogeny, which is a typical collisional orogenic belt. The change from broad muted age peaks in the syn-orogenic strata to a single peak in the post-orogenic sedimentary successions and in the modern river sediments implies a significant shift in provenance following continental collision. This temporal change in provenance highlights that the source(s), from which detrital zircons within syn-orogenic strata were derived, was no longer available during the later stages of the accretionary and collisional stages of the orogenic cycle. This may reflect some combination of tectonic burial, erosion, or possibly recycling into the mantle by tectonic erosion of the source(s). During continental collision, the incorporated continental crust is isolated from crustal recycling processes operative at subduction margins. This tectonic isolation combined with sedimentary recycling likely controls the presence of the isotopic signature associated with the Grenville Orogeny in the modern Mississippi and Appalachian river sediments. These results imply that zircon age peaks, which developed in conjunction with supercontinents, are the product of selective crustal preservation resulting from collisional orogenesis.
122 citations
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TL;DR: Based on studies of sediment accumulations deposited from-and erode by-alongslope flowing ocean currents on the European continental margin from Porcupine (Ireland) to Lofoten (Norway), the evolution of the Cenozoic paleocirculation was reconstructed as part of the STRATAGEM project as mentioned in this paper.
121 citations
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121 citations
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Australian National University1, Stockholm Resilience Centre2, Free University of Berlin3, University of Leicester4, British Geological Survey5, Scott Polar Research Institute6, Stanford University7, University of the Basque Country8, Max Planck Society9, University of Maryland, Baltimore County10, University of Birmingham11, Jan Kochanowski University12, Graduate Institute of International and Development Studies13, University of Leeds14, University of Rio Grande15, Institut de recherche pour le développement16, University of Washington17, University of Nairobi18, Harvard University19, Pace University20, Duke University21, University of Colorado Boulder22, Fridtjof Nansen Institute23, University of Vienna24, National Museum of Natural History25, University of Alberta26, Potsdam Institute for Climate Impact Research27
TL;DR: In this article, the authors explore two contrasting scenarios for the future of the Anthropocene, recognizing that the Earth System has already undergone a substantial transition away from the Holocene state.
Abstract: Stratigraphy provides insights into the evolution and dynamics of the Earth System over its long history. With recent developments in Earth System science, changes in Earth System dynamics can now be observed directly and projected into the near future. An integration of the two approaches provides powerful insights into the nature and significance of contemporary changes to Earth. From both perspectives, the Earth has been pushed out of the Holocene Epoch by human activities, with the mid-20th century a strong candidate for the start date of the Anthropocene, the proposed new epoch in Earth history. Here we explore two contrasting scenarios for the future of the Anthropocene, recognizing that the Earth System has already undergone a substantial transition away from the Holocene state. A rapid shift of societies toward the UN Sustainable Development Goals could stabilize the Earth System in a state with more intense interglacial conditions than in the late Quaternary climate regime and with little further biospheric change. In contrast, a continuation of the present Anthropocene trajectory of growing human pressures will likely lead to biotic impoverishment and a much warmer climate with a significant loss of polar ice.
121 citations
Authors
Showing all 2591 results
Name | H-index | Papers | Citations |
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Randall R. Parrish | 68 | 212 | 16398 |
David J.A. Evans | 67 | 422 | 16984 |
Melanie J. Leng | 67 | 494 | 18588 |
Benjamin P. Horton | 65 | 278 | 12838 |
Jim W. Hall | 64 | 409 | 16381 |
Robert J. Pankhurst | 63 | 173 | 12938 |
Luuk K. Koopal | 63 | 210 | 13240 |
António Ferreira | 63 | 458 | 13726 |
Russell S. Harmon | 62 | 259 | 12597 |
Edward Tipping | 62 | 207 | 14676 |
Jon Woodhead | 61 | 226 | 16730 |
Gavin L. Foster | 61 | 182 | 12524 |
Paul Eggleton | 61 | 168 | 13421 |
Colin E. Snape | 60 | 430 | 14283 |
Andrew Binley | 59 | 278 | 16075 |