Journal of the Geological Society

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A review of the main structural and magmatic features of northern Sumatra
Journal of the Geological Society - Tập 136 Số 5 - Trang 569-577 - 1979
B. G. N. Page, J. D. Bennett, Nick Cameron, David Bridge, D.H. Jeffery, W. Keats, J. Thaib
Structural and magmatic features of northern Sumatra are reviewed, based on a continuing programme of reconnaissance mapping. Distinction is drawn between Tertiary sedimentation on the W and that in the centre and E, the dividing line being the main outcrop of the Sumatran Fault System (SFS) which traverses the length of the island. Large transcurrent movements on the SFS are indicated by ( a ) re... hiện toàn bộ
Structural frame work of the fore-arc basin, NW Sumatra
Journal of the Geological Society - Tập 137 Số 1 - Trang 77-91 - 1980
Daniel E. Karig, M. B. Lawrence, Gregory F. Moore, Joseph R. Curray
The fore-arc basin of the Sunda Arc off Sumatra is a strongly subsiding trough contained between the rising subduction complex and the elevated continental core. Up to 4 km of Miocene–Recent strata on the eastern flank of the basin have transgressed over an unconformity cut across a Palaeogene continental margin that was uplifted and structurally disrupted during the late Oligocene. The large step... hiện toàn bộ
Basement–cover relationships and deformation in the Northern Paraguai Belt, central Brazil: implications for the Neoproterozoic–early Paleozoic history of western Gondwana
Journal of the Geological Society - Tập 177 Số 3 - Trang 475-491 - 2020
Iara Maria dos Santos, Roberto Vizeu Lima Pinheiro, R. E. Holdsworth, Afonso César Rodrigues Nogueira, Hudson Pereira Santos, Fábio Henrique Garcia Domingos
The Northern Paraguai Belt, at the SE border of the Amazonian Craton, central Brazil, has been interpreted as a Brasiliano–Pan-African ( c. 650–600 Ma) belt with a foreland basin, recording collisional polyphase tectonism and greenschist-facies metamorphism extending from the late Precambrian to the Cambrian–Ordovician. New structural investigations indicate that the older metasedimentary rocks of... hiện toàn bộ
Neoproterozoic glaciation in the Earth System
Journal of the Geological Society - Tập 164 Số 5 - Trang 895-921 - 2007
Ian J. Fairchild, M. J. Kennedy
The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic tools. Whereas the marine 87 Sr/ 86 Sr signatures show a steady rise, δ 13 C fluctuates, the most reproducible variations being negative signatures in carbonate caps to glacial units, but more diagenetic w... hiện toàn bộ
Comprehensive refertilization of lithospheric mantle beneath the North China Craton: further Os–Sr–Nd isotopic constraints
Journal of the Geological Society - Tập 166 Số 2 - Trang 249-259 - 2009
Hongfu Zhang, S. L. Goldstein, Xinhua Zhou, Min Sun, Yue Cai
Abstract: Mantle peridotitic xenoliths in Cenozoic basalts from Hannuoba, on the northern margin of the Archaean North China Craton, have variable Re (0.01–0.30 ppb) and Os (2.7–6.2 ppb) abundances and 187 Os/ 188 Os (0.1138–0.1236) ratios. These xenoliths yield a range of Proterozoic Re depletion ages of 0.8–2.2 Ga that show a general correlation with olivine Fo. Mantle xenoliths in Cenozoic basa... hiện toàn bộ
Mechanisms and controls on the formation of sand intrusions
Journal of the Geological Society - Tập 159 Số 5 - Trang 605-617 - 2002
R.J.H. Jolly, Lidia Lonergan
Sandstone intrusions are found in all sedimentary environments but have been reported most commonly from deep-water settings. They also appear to be more frequently developed in tectonically active settings where applied tectonic stresses facilitate development of high fluid pressures within the sediments. A variety of mechanisms have been cited as triggers for clastic intrusions. These include se... hiện toàn bộ
Fault rocks and fault mechanisms
Journal of the Geological Society - Tập 133 Số 3 - Trang 191-213 - 1977
Richard H. Sibson
Physical factors likely to affect the genesis of the various fault rocks—frictional properties, temperature, effective stress normal to the fault and differential stress—are examined in relation to the energy budget of fault zones, the main velocity modes of faulting and the type of faulting, whether thrust, wrench, or normal. In a conceptual model of a major fault zone cutting crystalline quartzo... hiện toàn bộ
Dispersal, concentration and deposition of suspended matter in the North Sea
Journal of the Geological Society - Tập 144 Số 1 - Trang 161-178 - 1987
D. Eisma, J. Kalf
Suspended matter comes into the North Sea from the Atlantic Ocean, from the Channel, rivers, seafloor erosion, coastal erosion, the atmosphere, and from primary production. The contribution of the last source is temporarily large when phytoplankton growth is abundant, but is soon decomposed, mineralized or consumed so that over the year the net effect is small. Accumulation and deposition of suspe... hiện toàn bộ
The possible mechanics of convolute lamination in graded sand beds
Journal of the Geological Society - Tập 134 Số 1 - Trang 19-31 - 1977
J. R. L. Allen
Gravitationally unstable vertical gradients of bulk density can arise during the re-sedimentation of water-logged normally graded sand beds following liquidization, even though the density gradient imposed on the beds by the depositional process was originally stable. Convolute lamination, found chiefly in turbidites, is therefore capable of being formed under a wider range of circumstances than w... hiện toàn bộ
New single crystal 40 Ar/ 39 Ar ages improve time scale for deposition of the Omo Group, Omo–Turkana Basin, East Africa
Journal of the Geological Society - Tập 169 Số 2 - Trang 213-226 - 2012
Ian McDougall, Francis H. Brown, Paulo Vasconcelos, B. E. Cohen, David S. Thiede, Michael J. Buchanan
Six tuffaceous beds within the Omo Group of the Omo–Turkana Basin have been dated using the 40 Ar/ 39 Ar single crystal total fusion method on anorthoclase, yielding eruption ages. The Omo Group constitutes up to 800 m of subaerially exposed sediments surrounding Lake Turkana within the East African Rift system in northern Kenya and southern Ethiopia. Rhyolitic explosive eruptions produced tuffs a... hiện toàn bộ
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