Recently added articles from Journal of the Geological Society:
A solution to Darwin's dilemma of 1859: exceptional preservation in Salter's material from the late Ediacaran Longmyndian Supergroup, England
Jan 01, 2009; ... Study of historical and fresh collections from the Longmyndian Supergroup sheds new light on Ediacaran microbial communities and taphonomy. First reported by Salter in 1856, and noted by Darwin in the Origin of Species in 1859, a range of macroscopic bedding plane markings are already well known ...
The significance of the contemporaneous Logoisk impact structure (Belarus) and Afro-Arabian flood volcanism
Jan 01, 2009; ... The relationships between meteorite impact craters, flood basalt volcanism and sudden environmental perturbation on Earth have been debated extensively. We present only the second example of contemporaneous meteorite impact and flood basalt volcanism: the 17 km diameter Logoisk impact structure ...
Degree of magnetic anisotropy as a strain-intensity gauge in a saturated finite-strain zone
Jan 01, 2009; ... Anisotropy of magnetic susceptibility (AMS) analyses were carried out on mylonitic quartzites from the footwall of the Main Central Thrust Zone, Garhwal Higher Himalaya, India. A systematic increase in degree of magnetic anisotropy (P') with distance from the Main Central Thrust is documented, ...
New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces
Jan 01, 2009; ... Abstract: New magnetostratigraphic data from seven Western Ghats sections in the Deccan Volcanic Province are presented. These are combined with an established geochemically defined stratigraphy, and volcanological logs, to provide a correlated, chronological eruptive framework. We ...
Kinematics of the Greater Himalayan sequence, Dhaulagiri Himal: implications for the structural framework of central Nepal
Jan 01, 2009; ... Abstract: In the Dhaulagiri region of central Nepal quartz-rich specimens sampled from the Greater Himalayan sequence yield well-defined quartz c-axis fabrics with a dominant top-to-the-SW sense of shear. These fabrics reflect pervasive crystal-plastic deformation extending more than 8 ...
Probing the basement of southern Tibet: evidence from crustal xenoliths entrained in a Miocene ultrapotassic dyke
Jan 01, 2009; ... Abstract: A variety of felsic and mafic granulites and ultramafic rocks occur as xenoliths within a 12.7 Ma ultrapotassic dyke intruding Xigaze flysch immediately to the north of the Yarlung-Tsangpo suture zone in southern Tibet. Garnet-clinopyroxene-plagioclase-quartz thermobarometry on ...
The Eocene bimodal Piranshahr massif of the Sanandaj-Sirjan Zone, NW Iran: a marker of the end of the collision in the Zagros orogen
Jan 01, 2009; ... Abstract: The bimodal Piranshahr massif is composed of coeval but geochemically unrelated mafic (40.7 ± 0.2 Ma zircon U-Pb sensitive high-resolution ion microprobe (SHRIMP) age) and A-type felsic rocks (4 1 ± 0.5 Ma Rb-Sr and 41.3 ± 0.8 Ma zircon U-Pb SHRIMP age). The mafic rocks consist ...
Post-collisional tectonomagmatic evolution in the northern Arabian-Nubian Shield: time constraints from ion-probe U-Pb dating of zircon
Jan 01, 2009; ... Abstract: Ion-probe U-Pb dating of plutonic rocks from the northern Arabian-Nubian Shield in Sinai and southern Israel constrains the timing of late East African batholithic post-collisional calc-alkaline (CA2) magmatism and within-plate alkaline to peralkaline (AL) magmatism to c ....
The record of tectonic denudation and erosion in an emerging orogen: an apatite fission-track study of the Sierra Nevada, southern Spain
Jan 01, 2009; ... Abstract: Apatite fission-track analysis of rocks from the Sierra Nevada basement, southern Spain reveals a detailed record of Neogene denudation. This is combined with evidence of the accumulation of clastic sedimentary rocks in the adjacent Granada Basin to provide a comprehensive ...
U-Pb zircon ages for post-Variscan volcanism in the Ligurian Alps (Northern Italy)
Jan 01, 2009; ... Abstract: Ages of Permian volcanic rocks from the Ligurian Briançonnais domain (Western Italian Alps) have been determined by laser ablation inductively coupled plasma mass spectrometry U-Pb dating of zircon. Three major volcanic units yielded zircons that were dated: calc-alkaline ...
Benthic macrofauna variations and community structure in Cenomanian cyclic chalk-marl from Southerham Grey Pit, SE England
Jan 01, 2009; ... Abstract: Cenomanian chalk-marl couplets from England represent the 20 ka Milankovitch precession cycle. Fossil communities from both chalk and marl are identified to test if the orbital fluctuations and the associated changes in substrate lithology and climate exerted any control on the ...
Global C cycle perturbations recorded in marbles: a record of Neoproterozoic Earth history within the Dalradian succession of the Shetland Islands, Scotland
Jan 01, 2009; ... Abstract: The Shetland Islands in Scotland contain a c. 12 km thick, mostly siliciclastic Neoproterozoic succession that experienced deformation and greenschist- to amphibolite-facies metamorphism during the Ordovician-Silurian Caledonian Orogeny. Correlating these rocks with ...
Detrital zircon age constraints on the provenance of sandstones on Hatton Bank and Edoras Bank, NE Atlantic
Jan 01, 2009; ... Abstract: U-Pb dating of detrital zircons shows that the provenance of Cretaceous-Palaeogene sandstones on Hatton and Edoras banks (SW Rockall Plateau) comprises magmatic rocks dated at c. 1800 Ma and c. 1750 Ma, respectively. Their depositional setting, first-cycle mineralogy and ...
Timing of migmatization and granite genesis in the Northwestern Terrane of Svalbard, Norway: implications for regional correlations in the Arctic Caledonides
Jan 01, 2009; ... Abstract: U-Pb ion microprobe investigations of zircons from gneisses, granites and migmatites of the pre-Devonian Smerenburgfjorden and Richarddalen Complexes constrain the tectonic evolution and origin of Svalbard's Northwestern Terrane. Field relationships combined with U-Pb age data ...
Ichnotaxonomy of microbial trace fossils in volcanic glass
Jan 01, 2009; ... Abstract: Ancient microbial activity in volcanic glass creates micron-sized cavities that can be regarded as trace fossils. These are common in glassy rims of oceanic pillow lavas and volcanic breccias. Morphologically comparable mineralized traces are also found in (meta)-volcanic ...
Submarine deposition of volcaniclastic material from the 1995-2005 eruptions of Soufrière Hills volcano, Montserrat
Jan 01, 2009; ... Abstract: Soufrière Hills volcano, Montserrat, has been erupting since 1995. During the current eruption, a large part of the material produced by the volcano has been transported into the sea, modifying the morphology of the submarine flanks of the volcano. We present a unique set of ...
Constraints on ^sup 87^Sr/^sup 86^Sr of Late Ediacaran seawater: insight from Siberian high-Sr limestones
Jan 01, 2009; ... Abstract: In SE Siberia, carbonate formations with δ^sup 13^C^sub carb^ values ranging between -12[per thousand] and -7[per thousand] (V-PDB) and Sr concentrations of up to 2.5% occupy an area of 40 000 km^sup 2^. Several successions exceed 1000 m in thickness and represent the ...
Society Awards for 2008
Sep 01, 2008; ... WOLLASTON MEDAL-Norman Sleep for his lifelong contribution to our understanding of physical processes of the Earth and planets. LYELL MEDAL-Alan Smith for his pioneering work on the application of computing technology in Earth sciences. MURCHISON MEDAL-Mike ...
Tectonic significance of the Highland Boundary Fault, Scotland
Sep 01, 2008; ... Abstract: None of the major roles assigned to the Highland Boundary Fault, such as a transcurrent fault with an orogen-parallel, sinistral displacement of several hundred kilometres, or terrane boundary, are confirmed. The Highland Boundary Fault can be traced NE-SW across Scotland for ...
Tectonic sequence diagrams and the structural evolution of schists and gneisses in multiply deformed terranes
Sep 01, 2008; ... Abstract: The current practice of numbering deformation phases (D^sub 1^ ... D^sub n^) in a multiple deformed terrane obscures the link between data and inference, and can lead to erroneous interpretations. Routine production of tectonic sequence diagrams (TSDs) allows a method whereby ...