Mélanges : 100th anniversary of the inception of the term and concept

Published on Oct 1, 2019in Gondwana Research6.478
· DOI :10.1016/
Andrea Festa19
Estimated H-index: 19
(UNITO: University of Turin),
Kei Ogata14
Estimated H-index: 14
Gian Andrea Pini21
Estimated H-index: 21
(UniTS: University of Trieste)
  • References (69)
  • Citations (2)
Abstract The Middle-Late Jurassic mountain building process in the Western Tethyan realm was triggered by west- to northwestward-directed ophiolite obduction onto the wider Adriatic shelf. This southeastern to eastern Adriatic shelf was the former passive continental margin of the Neo-Tethys, which started to open in the Middle Triassic. Its western parts closed from around the Early/Middle Jurassic boundary with the onset of east-dipping intra-oceanic subduction. Ongoing contraction led to ophi...
2 CitationsSource
#1Loren A. Raymond (SSU: Sonoma State University)H-Index: 1
Abstract Melanges play three principal, overlapping roles in the architecture of subduction accretionary complexes (SACs) during and after SAC formation. First, tectonic melanges serve as zones of concentrated deformation within and below the accreted rocks that are assembled during the subduction-accretion process. These melanges facilitate preservation of inter-melange, less deformed, accretionary units (AUs). Beneath the trench side of the SAC, the initial deformation zone along the decolleme...
7 CitationsSource
#1Paulina Fuentes (University of Atacama)H-Index: 2
#2Carlos Fernández Rodríguez (University of Huelva)H-Index: 29
Last. Manuel Díaz-Azpiroz (Pablo de Olavide University)H-Index: 10
view all 4 authors...
Abstract The Chanaral tectonic melange (northern Chile) is a local unit within the late Paleozoic accretionary complex formed at the southwestern margin of Gondwana. The structural characteristics of the studied melange were mostly developed during a first deformation phase (D1) and include a block-in-matrix fabric, lineations (L1) and foliations (S1), tight to intrafoliar folds, S-C and S-C-C′ composite planar fabrics, and a conspicuous spatial separation of domains with predominantly linear an...
2 CitationsSource
#1Koji Wakita (Yamaguchi University)H-Index: 4
Abstract The Palaeozoic to Mesozoic accretionary complexes of southwest Japan include various types of melange. Most melanges are polygenetic in origin, being sedimentary or diapiric melanges that were overprinted by tectonic deformation during subduction. Sedimentary melanges, without a tectonic overprint, are present in the Permian accretionary complexes of the Akiyoshi and Kurosegawa belts and in the Early Cretaceous accretionary complex of the Chichibu Belt. These melanges are characterized ...
2 CitationsSource
#1Jaroslava Hajná (Charles University in Prague)H-Index: 8
#2Jiří Žák (Charles University in Prague)H-Index: 19
Last. Jan PašavaH-Index: 16
view all 5 authors...
Abstract An intriguing example of chert–graywacke olistostrome is exceptionally well preserved within the late Neoproterozoic to early Cambrian Blovice accretionary wedge, Bohemian Massif. The olistostrome exhibits a block-in-matrix fabric defined by chert blocks isolated within the graywacke matrix. The major and trace element composition indicates two distinct types of cherts that formed either in a hydrothermal pelagic or hemipelagic environment supplied with a distal terrigenous material. Th...
3 CitationsSource
#1Andrea Festa (UNITO: University of Turin)H-Index: 19
#2Gian Andrea Pini (UniTS: University of Trieste)H-Index: 21
Last. Yildirim Dilek (Miami University)H-Index: 52
view all 4 authors...
Abstract Multiple episodes of deformation during the tectonic evolution of orogenic belts and ancient subduction-accretion complexes cause obfuscation of primary block-in-matrix fabric of melanges, and thereby making the recognition of their tectonic, sedimentary or diapiric origin difficult. Here we present a comprehensive overview and synthesis of a diverse set of field-based stratigraphic and structural criteria, which are at the base of geological mapping rules, to differentiate between vari...
14 CitationsSource
#1Gregory F. Moore (UH: University of Hawaii)H-Index: 44
#2Lin Thu Aung (NTU: Nanyang Technological University)H-Index: 2
Last. Tin Naing Tun (Mandalay University)H-Index: 1
view all 9 authors...
Abstract The western margin of Myanmar is the northern extension the active Sunda (India-Eurasia) subduction zone. Coastal regions and offshore islands have remarkable exposures of chaotic rock terranes along wave-cut terraces that allow characteristics of tectonic, sedimentary and diapiric melanges to be recognized. Tectonic shear zones (tectonic melanges) contain fragments of Cretaceous ophiolites (chrome-spinel-bearing peridotites and radiolarian cherts) that are in contact with thrust packet...
3 CitationsSource
#1Yujiro Ogawa (University of Tsukuba)H-Index: 27
Abstract This paper dealt with the summary of the outcrop observation of chaotic deposits (melanges) in the present and past accretionary prisms and complexes with comparative consideration from the conceptual results of deformation under un- and semi-lithified (weakly lithified) conditions. I stressed the significance of pore-fluid pressure, mud pressure (both are treated as head), and frequency of stress period in order to interpret chaotic deposits and related structures on outcrops. Most imp...
4 CitationsSource
#1David T. Katopody (UTD: University of Texas at Dallas)H-Index: 1
#2John S. OldowH-Index: 1
Abstract A belt of Jurassic to Cretaceous ophiolitic rocks borders the western margin of the U.S. Cordillera and stretches from central California to northwestern Washington State. The northern end of this belt lies between the San Juan Islands and the Northwest Cascades. Within this region, ophiolitic rocks consist of a succession of oceanic and arc-affinity igneous and sedimentary rocks which form a sedimentary melange and sedimentary overlap sequence which is imbricated during the mid-Cretace...
2 CitationsSource
#1John Wakabayashi (California State University, Fresno)H-Index: 26
Abstract This paper compares features of unambiguous tectonic serpentinite melanges (TSM) or serpentinite shear zones in the Coast Range ophiolite, Franciscan subduction complex, of coastal California and Sierra City Melange of the northern Sierra Nevada of northeastern California with undisputed sedimentary serpentinite melange (SSM) of the Great Valley Group (GVG) forearc basin deposits of coastal California, and with Franciscan serpentinite melanges of disputed (sedimentary versus tectonic) o...
4 CitationsSource
Cited By2
#1Andrea Festa (UNITO: University of Turin)H-Index: 19
#2Kei Ogata (VU: VU University Amsterdam)H-Index: 14
Last. Gian Andrea Pini (UniTS: University of Trieste)H-Index: 21
view all 3 authors...
A significant part of melanges recognized in exhumed convergent margins around the world have been recently documented to be chiefly originated from en-mass transport and subsurface remobilization and disruption (i.e., melanges, from sedimentary and mud-serpentinite diapiric processes and from in-situ fludification-disruption). Tectonic and/or sedimentary processes occurring during subsequent multiple deformational events of convergent margins evolution, commonly overprint and significantly rewo...
#2Andrea FestaH-Index: 19
view all 5 authors...
The strong morphological similitude of the block-in-matrix fabric of chaotic rock units (melanges and broken formations) makes problematic the recognition of their primary forming-processes. We present results of the comparison between magnetic fabric and mesoscale structural investigations of non-metamorphic tectonic, sedimentary, and polygenetic melanges in the exhumed Late Cretaceous to early Eocene Ligurian accretionary complex and overlying wedge-top basin succession in the Northern Apennin...
#1Paola TartarottiH-Index: 15
#2Sara GueriniH-Index: 1
Last. Marco ScambelluriH-Index: 36
view all 9 authors...
The primary stratigraphic fabric of a chaotic rock unit in the Zermatt Saas ophiolite of the Western Alps was reworked by a polyphase Alpine tectonic deformation. Multiscalar structural criteria demonstrate that this unit was deformed by two ductile subduction-related phases followed by brittle-ductile then brittle deformation. Deformation partitioning operated at various scales, leaving relatively unstrained rock domains preserving internal texture, organization, and composition. During subduct...
2 CitationsSource