Journal of the Geological Society back issues from January 2006:
Testing thrust tectonic models at mountain fronts: where has the displacement gone?
Jan 01, 2006; ... Abstract: The alternative relationships that can exist between a mountain front and the adjacent foreland basin have been recognized for many years. However, seismic reflection data from such areas are commonly of poor quality and therefore structural models may contain large ...
Geochronology of Carboniferous-Permian magmatism in the Midland Valley of Scotland: implications for regional tectonomagmatic evolution and the numerical time scale
Jan 01, 2006; ... Abstract: Four new U-Pb isotope dilution thermal ionization mass spectrometry dates from Carboniferous igneous rocks of the Midland Valley of Scotland are integrated with 16 recently published ^sup 40^Ar/^sup 39^Ar dates. The numerical and stratigraphical ages of the dated samples are ...
Intrusion-induced uplift and mass wasting of the Palaeogene volcanic landscape of Ardnamurchan, NW Scotland
Jan 01, 2006; ... Abstract: Fragmental rocks associated with the exhumed hearths of the Palaeogene volcanoes of NW Scotland have previously been interpreted as classic examples of vent-filling agglomerates of pyroclastic origin. Mapping and logging of these lithologies at the Ardnamurchan Central Complex ...
Influence of slump folds on tectonic folds: an example from the Lower Ordovician of the Anglo-Brabant Deformation Belt (Belgium)
Jan 01, 2006; ... Abstract: Although it is generally accepted that buckle folds will not develop in a perfectly planar layer without the presence of some irregularity or perturbation at which the folds initiate, there are very few cases in which individual natural folds can be linked to specific ...
The mid-Norwegian margin: a discussion of crustal lineaments, mafic intrusions, and remnants of the Caledonian root by 3D density modelling and structural interpretation
Jan 01, 2006; ... Abstract: The high-density lower crustal body (LCB) on the mid-Norwegian margin is almost universally interpreted to represent magmatically underplated material, added to the crust during Early Tertiary opening of the NE Atlantic. The thickness of the LCB is uneven, and its distribution ...
^sup 40^Ar/^sup 39^Ar laserprobe dating of mylonitic fabrics in a polyorogenic terrane of NW Iberia
Jan 01, 2006; ... Abstract: The tectonothermal evolution of a polyorogenic terrane in the Variscan belt of NW Spain has been constrained by ^sup 40^Ar/^sup 39^Ar laserprobe incremental heating experiments on mylonitic fabrics developed in major structures. Transitional levels between HP-HT and IP upper ...
Mare versus Lago-mare: marine fishes and the Mediterranean environment at the end of the Messinian Salinity Crisis
Jan 01, 2006; ... Abstract: During the late Messinian, c. 5.5 Ma ago, after evaporitic sedimentation and before the Pliocene flooding, the Mediterranean recorded a major environmental change testified by deposition of non-marine sediments of the so-called 'Lago-mare' facies. Such deposits are widespread ...
Latest Mid-Pennsylvanian tree-fern forests in retrograding coastal plain deposits, Sydney Mines Formation, Nova Scotia, Canada
Jan 01, 2006; ... Abstract: A latest Mid-Pennsylvanian (early Cantabrian) tree-fern forest is reported from Cape Breton Island, Nova Scotia. The fossil forest is rooted below the Point Aconi coal seam of the Sydney Mines Formation at Cranberry Head. The tree-ferns are preserved in the deposits of a ...
AMS and grain shape fabric of the Late Palaeozoic diamictites of the Southeastern Paraná Basin, Brazil
Jan 01, 2006; ... Abstract: Diamictites interbedded with marine shales and turbidites onlap the eastern border of the Paraná Basin (Southern Brazil). These poorly sorted sediments were deposited during the Permo-Carboniferous glaciation, and their matrix-supported clasts show no preferred orientation ....
K-Ar and ^sup 40^Ar/^sup 39^Ar geochronology of supergene processes in the Atacama Desert, Northern Chile: tectonic and climatic relations
Jan 01, 2006; ... Abstract: New K-Ar and ^sup 40^Ar/^sup 39^Ar data obtained for 29 samples of supergene alunite-, jarosite- and hollandite-group minerals from the Central Depression of Northern Chile document almost continuous supergene oxidation from 33 to 9 Ma. The downward migration of supergene ...
Eocene initiation of Ross Sea dextral faulting and implications for East Antarctic neotectonics
Jan 01, 2006; ... Abstract: The Ross Sea region of the East Antarctic plate provides evidence for intraplate tectonic activity in Cenozoic times. Still unresolved are the cause, timing and kinematics of this intraplate tectonism. By integrating and discussing the different (kinematic and temporal) signals ...
Active deformation within the Zagros Mountains deduced from GPS measurements
Jan 01, 2006; ... Abstract: We present and interpret the results of Global Positioning System (GPS) measurements at 35 stations in and beside the Zagros Mountain belt, SW Iran, for three campaigns ending March 1998, December 1999 and June 2001. Preliminary motion estimates show clearly the change in ...
Mesozoic extensional structures of the Fangshan tectonic dome and their subsequent reworking during collisional accretion of the North China Block
Jan 01, 2006; ... Abstract: The Fangshan area, SW of Beijing, lies at the junction of the NNE-trending Taihang mountain range and the southeastern portion of the Yanshan intraplate orogenic belt and has undergone at least five stages of deformation. Mid- to late Triassic extensional deformation (D^sub 1^) ...
Kinematics of active left-lateral faulting in SE Turkey from offset Pleistocene river gorges: improved constraint on the rate and history of relative motion between the Turkish and Arabian plates
Jan 01, 2006; ... Abstract: In the Arabian Platform of SE Turkey abundant evidence exists of fluvial incision by c. 110 ± 10 m since the late Early Pleistocene, starting in or around marine oxygen isotope stage 22 at 870 ka. This incision, which has accompanied regional surface uplift as the isostatic ...
Rift-initiation development of normal fault blocks: insights from the Hammam Faraun fault block, Suez Rift, Egypt
Jan 01, 2006; ... Abstract: An integrated structural and stratigraphic study of the Hammam Faraun fault block, Suez Rift, Egypt, provides insights into the rift-initiation tectonostratigraphic evolution of the crustal-scale normal fault blocks. The shallow marine to offshore Tayiba Formation (Lower ...
Sequence of tuffs between the KBS Tuff and the Chari Tuff in the Turkana Basin, Kenya and Ethiopia
Jan 01, 2006; ... Abstract: This paper describes a sequence of tuffs between the KBS and the Chari Tuff of Omo Group formations in Kenya and Ethiopia. These tuffs have recently been shown to be 1.87 ± 0.02 Ma and 1.38 ± 0.03 Ma in age, respectively. The sequence of tuffs that is derived is consistent with ...
Precise ^sup 40^Ar/^sup 39^Ar geochronology for the upper Koobi Fora Formation, Turkana Basin, northern Kenya
Jan 01, 2006; ... Abstract: The Plio-Pleistocene Koobi Fora Formation, about 560 m thick, crops out east of Lake Turkana and is part of the much larger depositional system of the Omo-Turkana Basin. The upper half of the Koobi Fora Formation from just below the KBS Tuff to above the Chari Tuff is ...
Discussion on development of polygonal fault systems: a test of hypotheses
Jan 01, 2006; ... D. M. D. James writes: the mechanics of formation of polygonal faults are widely acknowledged as not yet fully understood and it is welcome that Goulty & Swarbrick (2005) attempt a discriminatory test between rival hypotheses. It is however important that such a test bears some relation to ...