GeologyRocksEnd Ordovician Mass Extinction
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End Ordovician Mass Extinction
Fri, 05/26/2006 - 07:35Hello Benauld
Try:
http://hannover.park.org/Canada/Museum/extinction/ordmass.html
It's only brief but gives a reasonably good overview.
Cheers
Gus
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End Ordovician Mass Extinction
Fri, 05/26/2006 - 08:45Hi Ben,
I typed in "Ordovician extinction" on science direct and it spat out the following. The links should take you to the abstract. If you want the paper proper, drop me an email or PM and I'll see if I can download it.
1) The palaeoclimatology, palaeoecology and palaeoenvironmental analysis of mass extinction events Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 232, Issues 2-4, 22 March 2006, Pages 190-213 Richard J. Twitchett
Abstract
2) Microbial carbonate abundance compared with fluctuations in metazoan diversity over geological time Sedimentary Geology, Volume 185, Issues 3-4, 15 March 2006, Pages 229-238 Robert Riding
Abstract
3) The earliest Helicosalpinx from Canada and the global expansion of commensalism in Late Ordovician sarcinulid corals (Tabulata) Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 215, Issues 1-2, 2 December 2004, Pages 99-110 Leif Tapanila
Abstract
4) Biostratigraphy, taxonomic diversity and patterns of morphological evolution of Ordovician acritarchs (organic-walled microphytoplankton) from the northern Gondwana margin in relation to palaeoclimatic and palaeogeographic changes Earth-Science Reviews, Volume 67, Issues 3-4, October 2004, Pages 267-311 Marco Vecoli and Alain Le Herisse Abstract
5) Ecological ranking of Phanerozoic biodiversity crises: ecological and taxonomic severities are decoupled Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 211, Issues 3-4, 3 September 2004, Pages 289-297 George R. McGhee, Jr., Peter M. Sheehan, David J. Bottjer and Mary L. Droser
Abstract
6) The Middle Caradoc Facies and Faunal Turnover in the Late Ordovician Baltoscandian palaeobasin Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 210, Issues 2-4, 5 August 2004, Pages 119-133 Leho Ainsaar, Tonu Meidla and Tonu Martma
Abstract
7) Ordovician reef systems and settings in South China before the Late Ordovician mass extinction Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 205, Issues 3-4, 30 March 2004, Pages 235-254 Yue Li , Steve Kershaw and Xinan Mu Abstract
8) Facies patterns and geography of the Yangtze region, South China, through the Ordovician and Silurian transition Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 204, Issues 3-4, 25 February 2004, Pages 353-372 Chen Xu , Rong Jia-yu , Li Yue and A. J. Boucot
Abstract
9) The Ireviken Event in the lower Silurian of Gotland, Sweden - relation to similar Palaeozoic and Proterozoic events Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 195, Issues 1-2, 5 June 2003, Pages 99-124 Axel Munnecke, Christian Samtleben and Torsten Bickert Abstract
10) Comparative analysis of the end-Permian and end-Ordovician brachiopod mass extinctions and survivals in South China Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 188, Issues 1-2, 1 December 2002, Pages 25-38 Jia-yu Rong and Shu-zhong Shen Abstract
11) Carbon isotope stratigraphy in the latest Ordovician of Estonia Chemical Geology, Volume 175, Issues 1-2, 1 May 2001, Pages 49-59 D. Kaljo, L. Hints, T. Martma and J. Nolvak
Abstract
12) The effects of the final stages of the Late Ordovician glaciation on marine palynomorphs (chitinozoans, acritarchs, leiospheres) in well Nl-2 (NE Algerian Sahara) Review of Palaeobotany and Palynology, Volume 113, Issues 1-3, December 2000, Pages 87-104 F. Paris, A. Bourahrouh and A. L. Herisse
Abstract
13) A global carbon isotope excursion (SPICE) during the Late Cambrian: relation to trilobite extinctions, organic-matter burial and sea level Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 162, Issues 3-4, October 2000, Pages 211-223 Matthew R. Saltzman, Robert L. Ripperdan, M. D. Brasier, Kyger C. Lohmann, Richard A. Robison, W. T. Chang, Shanchi Peng, E. K. Ergaliev and Bruce Runnegar
Abstract
14) Geochemical and facies evidence for palaeoenvironmental change during the Late Ordovician Hirnantian glaciation in South Sichuan Province, China Global and Planetary Change, Volume 24, Issue 2, March 2000, Pages 133-152 Tingshan Zhang, Stephen Kershaw, Yun Wan and Guangzi Lan
Abstract
15) Mass extinctions and sea-level changes Earth-Science Reviews, Volume 48, Issue 4, December 1999, Pages 217-250 A. Hallam and P. B. Wignall Abstract
16) Organophosphatic brachiopods:Patterns of biodiversification and extinction in the Early Palaeozoic Geobios, Volume 32, Issue 2, 1999, Pages 145-163 Michael G. Bassett, Leonid E. Popov and Lars E. Holmer Abstract
17) Biospheric perturbations during Gondwanan times: From theNeoproterozoic-Cambrian radiation to the end-Permian crisis Journal of African Earth Sciences, Volume 28, Issue 1, 1999, Pages 115-127 Douglas H. Erwin Abstract
18) Relationship between rates of speciation and phyletic evolution: Stratophenetic data on pelagic conodont chordates and benthic ostracods Geobios, Volume 32, Issue 2, 1999, Pages 205-221 Jerzy Dzik
Abstract
19) Patterns of Gondwana plant colonisation anddiversification Journal of African Earth Sciences, Volume 28, Issue 1, 1999, Pages 145-167 J.M. Anderson, H.M. Anderson, S. Archangelsky, M. Bamford, S. Chandra, M. Dettmann, R. Hill, S. McLoughlin and O. Rosler
Abstract
20) Biological interpretationand paleobiodiversity of a cryptic fossil group: The "chitinozoan animal"
Geobios, Volume 32, Issue 2, 1999, Pages 315-324 Florentin Paris and Jaak Nolvak
Abstract
21) Caradoc bivalves from the Argentine precordillera: A local radiation-extinction event Geobios, Volume 32, Issue 2, 1999, Pages 333-340 Teresa M. Sanchez Abstract
22) Paleodiversification des spores et des cryptospores de l'Ordovicien au Devonien inferieur Geobios, Volume 32, Issue 2, 1999, Pages 341-352 Philippe Steemans
Abstract
23) High palaeolatitude (Hodh, Mauritania) recovery of graptolite faunas after the Hirnantian (end Ordovician) extinction event Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 142, Issues 3-4, 15 October 1998, Pages 91-105 Charlie J. Underwood, Max Deynoux and Jean-Francois Ghienne
Abstract
24) Global carbon isotopic events associated with mass extinction and glaciation in the late Ordovician Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 132, Issues 1-4, August 1997, Pages 195-210 James D. Marshall, Patrick J. Brenchley, Paul Mason, George A. Wolff, Ricardo A. Astini, Linda Hints and Tonu Meidla
Abstract
25) Development of Palaeozoic-Mesozoic Radiolaria in the Northwestern Pacific Rim Marine Micropaleontology, Volume 30, Issues 1-3, March 1997, Pages 79-95 Valentina Vishnevskaya Abstract
26) Corelation between geologicallymarked climatic changes and extinctions Geobios, Volume 30, Supplement 1, 1997, Pages 61-65 Arthur J. Boucot, Chen Xu and Christopher R. Scotese Abstract
27) Inquiring into indicators and origin of catastrophic events at stratigraphic boundaries Journal of Southeast Asian Earth Sciences, Volume 13, Issues 3-5, March-May 1996, Pages 373-378 Zhang Qinwen and Xu Daoyi Abstract
Jon
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Mon, 06/26/2006 - 18:22Hi Jon,
I've finally made some time to look through the abstracts above, and have sent a PM to you. Can you; or anybody else for that matter, clarify what a "Carbon Isotope Excursion" (Negative or Positive) is, and what effects it produces in the environment?
Ben.
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Tue, 06/27/2006 - 19:21My three sentences explanation is:
You can measure the amoutn of one carbon isotope with respect to another (i.e. carbon 12 to 13). When this amount varies, it's called an excursion. They can tell you useful stuff about things...
Not a particularly useful few sentences, I admit.
Try:
http://wwwrcamnl.wr.usgs.gov/isoig/res/funda.html
http://wwwrcamnl.wr.usgs.gov/isoig/isopubs/itchch2.html
Hope this rambling nonsense helps...
Jon
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End Ordovician Mass Extinction
Tue, 06/27/2006 - 20:40You can measure the amoutn of one carbon isotope with respect to another (i.e. carbon 12 to 13). When this amount varies, it's called an excursion. They can tell you useful stuff about things...
Not to get off topic, but this is a similar situation to oxygen isotopes (16 and 18 ), which can be used to figure out how much glaciation there was in the world at the time, right? Since the ice would rather gobble up the lighter isotope (IIRC?), you can compare the numbers to the "normal" ratio and determine how much ice there was.
What kind of stuff can you figure out with carbon? Do living things use enough of the total Earthly amount that we can figure out how life-rich the planet was at that time? I thought living things preferred the lighter form.
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Wed, 06/28/2006 - 07:43It is a similar situation, indeed!
I'm not 100% (in fact it's more like 10%) on what carbon isotopes can be used for, but I've seen methene mentioned a lot when it comes to carbon isotopes...
I may find time for a google later...
Jon
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Wed, 07/05/2006 - 17:40Hi,
Carbon isotope excursions have a variety of causes as the global carbon cycle is so complex, which makes them difficult to interpret. The likely cause depends upon, predominantly, the length of excursion and how the climate changed at the same time.
All carbon is partitioned into the organic or inorganic reservoirs, which include mantle carbon, sediments, etc. Organic carbon is always very negative, inorganic carbon is slightly negative to positive. How much of these reservoirs are oxidised to / present as (atmospheric and oceanic) carbon dioxide, and so involved in carbonate precipitation, determines the carbon isotope signal. Excursions are generally due to things like: oxidation of buried organic matter, methane hydrate release and oxidation, carbonate dissolution.
Sorry, that's probably not very clear. I think I've got a good introductory paper to carbon isotope systematics somewhere - I'll try and find the ref and put it up 
.
Michelle
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End Ordovician Mass Extinction
Submitted by Benauld on Thu, 05/25/2006 - 18:23.Hey Guys and Gals,
The title says it all really, can anybody point me in the direction of any interesting research or other information concerning this extinction event?
As ever, your help is always appreciated!
Ben.