A new paper is out in Nature Communications – a study by Fabien Leprieur and co-authors (including me) on how plate tectonics influences the biodiversity dynamics of tropical reefs. Previously published paleo-shoreline estimates (see data on Github and Heine et al paper) have were used as base to model paleo-bathymetry and time-dependent spatial diversification patterns of tropical marine reefs – here’s the abstract:
The Cretaceous breakup of Gondwana strongly modified the global distribution of shallow tropical seas reshaping the geographic configuration of marine basins. However, the links between tropical reef availability, plate tectonic processes and marine biodiversity distribution patterns are still unknown. Here, we show that a spatial diversification model constrained by absolute plate motions for the past 140 million years predicts the emergence and movement of diversity hotspots on tropical reefs. The spatial dynamics of tropical reefs explains marine fauna diversification in the Tethyan Ocean during the Cretaceous and early Cenozoic, and identifies an eastward movement of ancestral marine lineages towards the Indo-Australian Archipelago in the Miocene. A mechanistic model based only on habitat-driven diversification and dispersal yields realistic predictions of current biodiversity patterns for both corals and fishes. As in terrestrial systems, we demonstrate that plate tectonics played a major role in driving tropical marine shallow reef biodiversity dynamics.
The Rifts III conference at the Geol Soc London in March 2016 has opened for registration. We’ve managed to put together a world-class programme for 3 exciting days of rift and rifted passive margin-related academic and industry research.
The objective of this conference series is to challenge the current understanding of rifts, rifted passive margins and their evolution given ever-improving seismic and remotely-sensed data, computational modelling and integration capabilities, new insights from field analogues, contrasting and contradicting scientific concepts as well as recent results from scientific and industry drilling campaigns.
The by-invitation-only technical program covers about 60 contributions from leading academic and industry authors over 3 days, ranging in scale from plates to reservoir, in a healthy mix of cutting edge observational and modelling studies. The keynote presentations will given by:
Gianreto Manatschal (U Strasbourg, FR): Controls on structural and magmatic variability along rifted margins: From observations to interpretations
Cynthia Ebinger (U Rochester, US): Strain accommodation by faulting and magmatism during rift initiation
Ritske Huismans (U Bergen, NO): Linking lithosphere deformation and sedimentary basin formation over multiple scales
Sascha Brune (GFZ Potsdam, DE): Numerical modelling of rift dynamics: Linking observations on fault, basin and global scale
Nicky White (Cambridge, UK): Deep-Water Margins, Dynamic Topography and Sequence Stratigraphy
Hans-Christian Rønnevik (Lundin AS, NO): Exploration of mature areas on the Norwegian Continental Shelf since 2000
Together with colleagues from industry and academia, I am convening the “Rifts III” conference at the Geological Society of London on 22 – 24 March 2016. It is the third incarnation of the “Rifts” conference series which started in 2004, and offers a unique platform to connect academic and industry researchers and explorationists to exchange views and provide updates on the newest developments of rift and passive margin research. We’re in the process of lining up an impressive array of speakers who are at the forefront of the science and exploration of rifted basins and passive margins.
The objectives of the conference are to challenge paradigms and consider the applicability of new ideas to the latest sub-surface datasets. The technical program will be designed to address many of the critical parameters raised in these areas e.g. rift architectures, break-up models, continent-ocean boundaries, subsidence patterns, facies distribution and heat flow.
The three-day conference will be constructed around six half-day sessions and four broad themes of oral presentation that will polarize the scales of investigation and reveal the direct applicability of the emerging theorems. Many rift model paradigms underpin our understanding and exploration of rifted continental margins and new exploration concepts need to be consistently applied. However, numerous aspects of crustal evolution and lithospheric extension remain contentious, and new sub-surface datasets have highlighted important apparent conjugate paradoxes. Heat flow, subsidence and passive margin formation appear to be subject to both temporal and spatial anomalies related to rift processes.
As geoscientist working for industry one comes across some rare chances to have a look at quite impressive pieces of heavy metal. I’ve recently had the chance to visit Allseas’ Pioneering Spirit, a pipe-laying and platform decommissioning vessel which is currently being prepped in the port of Rotterdam for the first project in 2016. The vessel is the largest ship in the world, going by deck size, dwarfing many of the publicly well known large ships like aircraft carriers, supertankers and cargo vessels. Here are a few impressions of that mighty piece of metal and engineering. There’s also some video footage of the vessel which can be found on YouTube – and the mighty lady even has her own Twitter feed (with more videos and pictures there).
The mighty ship in Maasvlakte 2
The lifting beams which are supposed to hold the platform legs
The stinger transition frame . It requires its own support vessel to be transported.
Starboard view, with helideck.
View from the entertainment room towards the portside pipeline loading
Pipe storage on the portside part of the vessel
The bridge. Wooden steering wheel included (only temporary decoration though…)
Aft side of the bridge. Special sunglasses included.
Vie to the helideck and the Europoort in the background.
Displays, joysticks, the whole shebang
Lift ops part of the bridge
Fast lift – the magic green button to lift a couple of thousand tons in 10 sec…
Diesel power x9 – 170000 hp or 97 MW.
Navigation display showing the peculiar design of the vessel with the bow being catamaran hulls while the aft part is just plane humongous rectangular bathtub.
Bridge in full width.
Bow view. The space between the two bows with the lifting beams occupied by a barge used for construction.
Horizontal view of the lifting beams with virtual jackup rig
May the force be with you. Thruster steering panel.
Making the way up to the helideck
View of the bow side of the bridge
Aft deck view
Fancy a soccer match? WIde open space on the uppermost deck
The Tog Mor, a shallow water pipe laying vessel
Base of the starboard aft crane
On the aft deck
Joint assembly on aft deck with connection to lower deck and ‘firing line’ for pipeline assembly
View from portside aft towards the
Portside lifting beams
Starboard lifting beam
View up the bridge
Crane for double joints
Into the abyss – double joints are lowered onto the lower deck and assembled to a pipeline along the ‘firing line’
Slightly thicker than your average steel cable
Heart of the ship
Clamps to maintain the right tension of assembled joints
Together with former Ph.D. student Logan Yeo, we’ve reverse-engineered a set of global paleoshoreline compilations by Golonka et al. (2006)  and Smith et al. (1994)  and taken them back from the age of “dark data” being only published in analogue form, to fully digital versions. The paleoshoreline models are made available publicly in different formats, ready to be reconstructed with GPlates using different plate models. The data is published on the web alongside the paper (in press) in the Australian Journal of Earth Sciences (Heine, Yeo & Muller: Evaluating global paleoshoreline models for the Cretaceous and Cenozoic, Aust. J. Earth Sciences, in press) and they show the evolution of land area over time from ~150 Ma to the present according to the two different paleoshoreline estimates.
The files are available on my GitHub page here in *.gpml, *.geojson and *.shp format and can be viewed online. Unfortunately it doesn’t seem to be possible to embed the map on wordpress.com – I originally envisaged some funky webX.X embedded mapping here, but no. Instead web1.0 style links to follow for a sneak peek and some screenshots below:
The rendering through GitHub is fast and allows a quick overview about the global and regional paleoshoreline locations, allowing zooming in and panning.
Paleoshorelines in the Golonka model for the 139-123 Ma time slice rendered from a geojson file live on GitHub. The colored area inside the polygon is equivalent to interpreted land (above sealevel) in the given time interval.
Another option to access the data is to use the version on CartoDB and interactively query and alter the data.
 GOLONKA J., KROBICKI M., PAJAK J., VAN GIANG N. & ZUCHIEWICZ W. 2006. Global Plate Tectonics and Paleogeography of Southeast Asia. Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Arkadia, Krakow, Poland.
 SMITH A., SMITH D. G. & FURNELL B. M.1994. Atlas of Mesozoic and Cenozoic coastlines. Cambridge University Press, 112 p. Cambridge, United Kingdom.
While it has been a little break over the summer on this blog, I have nevertheless been able to make a few updates related to the geological time color palettes (see this link for the original post). I have added the GTS2004 palettes (epochs and ages) and also the SEPM95 timescale. The color palettes (or *.cpt files) are designed for use with the Generic Mapping Tools (GMT) but can also be loaded in GPlates. On cpt-city, other formats are also available:
Both palettes are still incomplete and require the extension back in geological time or adding eons or epochs. You can find the files on my BitBucket repository (https://bitbucket.org/chhei/gmt-cpts/). Any contribution to extend the individual files or add new timescales (or formats such as for QGIS) will be greatly appreciated!