Signatur:
9/M 95.0255
In:
Geological Society special publication
Beschreibung / Inhaltsverzeichnis:
Geoscientists need to familiarize themselves with the characteristics of actual plate motions. A popular, current thesis relates the state of stress to the degree of coupling of the two convergent plates. Recent two-dimentional, finite element modelling has demonstrated how the stress in the overriding plate is critically dependent on wether the subduction zone is locked (i.e. high degree of coupling) or unlocked. Thus the compressional stress regime occurs in locked systems, and extensional strees in unlocked systems; a gradient from compression in the fore-arc to extension in the back-arc is said to characterize partially locked system. However, studies of the strain field in real cases (modern arc regions) clearly indicate the prevalence of subhorizontal extension orientated nearly perpendicular to the arc. Implicit in these real observations is the suggestion that stresses resulting from plate coupling are either not transmitted to the volcanic arc, or else locked subduction zones are uncommon and extension may be the normal mode of behaviour.
The rationale and evidence for extension and coeval volcanism at consuming plate margins is presented. Using mainly Cenozoic case histories for oceanic and continental margin arcs, structural evidence is presented, which demonstrates that volcanism in most arc systems is contemporaneous with normal faulting and subsidence as a general case. Representive, modern geochemical data sets are provided and integrated in a petrological discussion for each case history. The western Pacific, now widely regard as a type region for the study of convergent plate margin processes, is particularly well represented. Also included is evidence from less commonly insvestigated regions, where subduction has ceased or is no longer obvious but an association with an arc is unequivocal. By these means, it is hoped that this volume contains a representative cross-section of current research on extension-related arc volcanism in broadest sense, and that it will stimulate further discussion and research into the complex tectonics and petrology of covergent plate margins.
Materialart:
Monographie ausleihbar
Seiten:
293 S.
,
Ill., graph. Darst., Kt.
ISBN:
1897799179
Serie:
Geological Society special publication 81
URL:
http://sp.lyellcollection.org/content/81/1
Klassifikation:
Petrologie / Petrographie
Sprache:
Englisch
Anmerkung:
J. L. Smellie: Volcanism associated with extension at consuming plate margins / Geological Society, London, Special Publications, 81:1, doi:10.1144/GSL.SP.1994.081.01.01 ---
Tectonics and Magmatism ---
Warren B. Hamilton: Subduction systems and magmatism / Geological Society, London, Special Publications, 81:3-28, doi:10.1144/GSL.SP.1994.081.01.02 ---
Oceanic Arc Systems ---
Peter D. Clift and ODP Leg 135 Scientific Party: Volcanism and sedimentation in a rifting island-arc terrain: an example from Tonga, SW Pacific / Geological Society, London, Special Publications, 81:29-51, doi:10.1144/GSL.SP.1994.081.01.03 ---
Julian A. Pearce, Michelle Ernewein, Sherman H. Bloomer, Lindsay M. Parson, Bramley J. Murton, and Lynn E. Johnson: Geochemistry of Lau Basin volcanic rocks: influence of ridge segmentation and arc proximity / Geological Society, London, Special Publications, 81:53-75, doi:10.1144/GSL.SP.1994.081.01.04 ---
Ulrich Knittel and Oles Dietmar: Basaltic volcanism associated with extensional tectonics in the Taiwan-Luzon island arc: evidence for non-depleted sources and subduction zone enrichment / Geological Society, London, Special Publications, 81:77-93, doi:10.1144/GSL.SP.1994.081.01.05 ---
M. R. Wharton, B. Hathway, and H. Colley: Volcanism associated with extension in an Oligocene—Miocene arc, southwestern Viti Levu, Fiji / Geological Society, London, Special Publications, 81:95-114, doi:10.1144/GSL.SP.1994.081.01.06 ---
Rex N. Taylor and Robert W. Nesbitt: Arc volcanism in an extensional regime at the initiation of subduction: a geochemical study of Hahajima, Bonin Islands, Japan / Geological Society, London, Special Publications, 81:115-134, doi:10.1144/GSL.SP.1994.081.01.07 ---
C. Picard, M. Monzier, J.-P. Eissen, and C. Robin: Concomitant evolution of tectonic environment and magma geochemistry, Ambrym volcano (Vanuatu, New Hebrides arc) / Geological Society, London, Special Publications, 81:135-154, doi:10.1144/GSL.SP.1994.081.01.08 ---
J. C. Aitchison and P. G. Flood: Gamilaroi Terrane: A Devonian rifted intra-oceanic island-arc assemblage, NSW, Australia. / Geological Society, London, Special Publications, 81:155-168, doi:10.1144/GSL.SP.1994.081.01.09 ---
Continental Margin Arcs ---
André Pouclet, Jin-Soo Lee, Philippe Vidal, Brian Cousens, and Hervé Bellon: Cretaceous to Cenozoic volcanism in South Korea and in the Sea of Japan: magmatic constraints on the opening of the back-arc basin / Geological Society, London, Special Publications, 81:169-191, doi:10.1144/GSL.SP.1994.081.01.10 ---
J. A. Gamble, I. C. Wright, J. D. Woodhead, and M. T. McCulloch: Arc and back-arc geochemistry in the southern Kermadec arc-Ngatoro Basin and offshore Taupo Volcanic Zone, SW Pacific / Geological Society, London, Special Publications, 81:193-212, doi:10.1144/GSL.SP.1994.081.01.11 ---
G. Pe-Piper, D. J. W. Piper, C. N. Kotopouli, and A. G. Panagos: Neogene volcanoes of Chios, Greece: the relative importance of subduction and back-arc extension / Geological Society, London, Special Publications, 81:213-231, doi:10.1144/GSL.SP.1994.081.01.12 ---
Nicholas Petford and Michael P. Atherton: Cretaceous-Tertiary volcanism and syn-subduction crustal extension in northern central Peru / Geological Society, London, Special Publications, 81:233-248, doi:10.1144/GSL.SP.1994.081.01.13 ---
Pavel Kepezhinskas: Diverse shoshonite magma series in the Kamchatka Arc: relationships between intra-arc extension and composition of alkaline magmas / Geological Society, London, Special Publications, 81:249-264, doi:10.1144/GSL.SP.1994.081.01.14 ---
M. J. Hole, A. D. Saunders, G. Rogers, and M. A. Sykes: The relationship between alkaline magmatism, lithospheric extension and slab window formation along continental destructive plate margins / Geological Society, London, Special Publications, 81:265-285, doi:10.1144/GSL.SP.1994.081.01.15
Standort:
Lesesaal
Zweigbibliothek:
GFZ Bibliothek
Permalink
