Metamorphism, partial preservation, and exhumation of ultrahigh‐pressure belts

  title={Metamorphism, partial preservation, and exhumation of ultrahigh‐pressure belts},
  author={W. Gary Ernst},
  journal={Island Arc},
  • W. Ernst
  • Published 1 June 1999
  • Geology
  • Island Arc
The Dabie‐Sulu belt of east‐central China, the Kokchetav Complex of northern Kazakhstan, the Maksyutov Complex of the South Urals, the Dora Maira Massif of the Western Alps, and the Western Gneiss Region of southwestern Norway lie astride intracontinental suture zones. All represent collisional mountain belts. Adjoining Eurasian regions exhibit little or no evidence of a coeval calc‐alkaline arc. Each metamorphic complex contains mineralogic and textural relics of the presence or former… 
Deformation history of the eclogite‐ and jadeitite‐bearing mélange from North Motagua Fault Zone, Guatemala: insights in the processes of a fossil subduction channel
In Guatemala, along the northern side of the Motagua Valley, a mélange consisting of blocks of eclogite and jadeitite set in a metaserpentinitic and metasedimentary matrix crops out. The
The diamond‐bearing Kokchetav UHP massif in Northern Kazakhstan: exhumation structure
In the Kokchetav ultrahigh‐pressure (UHP) massif in northern Kazakhstan, diamond‐bearing UHP rocks occur exclusively in a western, rhomb‐shaped domain, that differs from an eastern transpressional
Eclogites of the Bergen Arcs Complex, Norway: Petrology and Mineral Chronometry
A considerable portion of the Bergen Arcs polymetamorphic complex (southwestern Norway) is composed of anorthosite rocks strongly reworked in the course of two regional metamorphic events, granulite
Pre‐collisional high pressure metamorphism and nappe tectonics at active continental margins: a numerical simulation
The evolution of a subduction channel and orogenic wedge is simulated in 2D for an active continental margin, with P‐T paths being displayed for selected markers. In our simulation, subduction
White mica trace element and boron isotope evidence for distinctive infiltration events during exhumation of deeply subducted continental crust
ABSTRACT Previous study of subducted continental crust within the Luliang Shan terrane in Northwest China has documented metasomatic formation of thick, hydrated phengite + garnet-rich selvages at
Consequences of progressive eclogitization on crustal exhumation, a mechanical study
SUMMARY The very low water content of the granulitic unit of Holsnoy, in the Bergen Arcs, Norway, caused its partial metastable preservation throughout Caledonian burial end exhumation, leading to
The Exhumation of Eclogite-Facies Metamorphic Rocks—a Review of Models Confronted with Examples from the Alps
We summarize recently proposed models for the exhumation of (ultra-) high pressure ([U]HP) metamorphic units within collisional orogens. In terms of mechanics, exhumation is either caused by buoyancy
The Exhumation of Eclogite-Facies Metamorphic Rocks-a Review of Models Confronted with Examples from the Alps
We summarize recently proposed models for the exhumation of (ultra-) high pressure ([U]HP) metamorphic units within collisional orogens. In terms of mechanics, exhumation is either caused by buoyancy
Discovery of coesite from Indus Suture Zone (ISZ), Ladakh, India: Evidence for deep subduction
Coesite, the high-pressure polymorph of quartz has been identified for the first time in the Tso-Morari Crystalline Complex, Ladakh (India) in the Himalayan belt. The preservation of coesite grains
Exhumation of high‐pressure metamorphic rocks in a subduction channel: A numerical simulation
High‐pressure metamorphic rocks provide evidence that in subduction zones material can return from depths of more than 100 km to the surface. The pressure‐temperature paths recorded by these rocks


Geotectonic evolution of diamondiferous paragneisses, Kokchetav Complex, northern Kazakhstan: The geologic enigma of ultrahigh‐pressure crustal rocks within a Paleozoic foldbelt
The Kokchetav Complex is a tectonic mega-melange consisting of seven pre-Ordovician units (units I-VII) of contrasting lithologies and P–T conditions of metamorphism, overlain and/or intruded by four
Regional ultrahigh-pressure coesite-bearing eclogitic terrane in central China: Evidence from country rocks, gneiss, marble, and metapelite
The Dabie Mountains represent a fault-bounded, coesite-bearing eclogite gneissic terrane within the collisional belt between the Sino-Korean and Yangtze cratons. The following geologic evidence
What brought them up? Exhumation of the Dabie Shan ultrahigh-pressure rocks
Metamorphic coesite and diamond in the Dabie Shan, eastern China, testify to subduction of continental crust to >100 km depth. Exhumation of these ultrahigh-pressure rocks through the crust
Contrasting plate-tectonic styles of the Qinling-Dabie-Sulu and Franciscan metamorphic belts
The Dabie Mountains are part of the >2000-km-long Qinling-Dabie-Sulu suture zone juxtaposing the Sino-Korean and Yangtze cratons. An eastern extension apparently crosses Korea and lies along the
Ultrahigh‐pressure metamorphic rocks and the thermal evolution of continent collision belts
Coesite-bearing eclogites exposed in the Alpine, Qinling-Dabie (China), Caledonian, and Ural orogenic belts provide insight into the time-dependent thermal structure of continent collision belts.
Metamorphic zonations on presumably subducted lithospheric plates from Japan, California and the Alps
High-pressure blueschist-type mineral parageneses from the Sanbagawa belt of southwestern Japan, the Franciscan terrane of western California and the Sesia zone, Pennine and Helvetic realms of the
An overview and tectonic synthesis of the pre‐Tertiary very‐high‐pressure metamorphic and associated rocks of Java, Sulawesi and Kalimantan, Indonesia
High‐pressure metamorphic rocks are widely distributed in Cretaceous accretionary complexes throughout Java, Sulawesi (formerly Celebes) and southeast Kalimantan (Indonesian Borneo). Many of these
Tectonic evolution of the ultrahigh-pressure (UHP) and high-pressure (HP) metamorphic belts from central China
In the Triassic suture between the Sino-Korean and Yangtze cratons, the Dabie metamorphic Complex in central China includes three tectonic units: the northern Dabie migmatitic terrane, the central
Tectonics of an ultrahigh‐pressure metamorphic terrane: The Dabie Shan/Tongbai Shan Orogen, China
Ultrahigh-pressure metamorphic rocks with coesite and diamond form a tectonic slice over 20 km thick, called the eclogite zone, within the Dabie Shan complex in the Qinling orogen in central China.
Tectonic Setting and Petrology of Ultrahigh-Pressure Metamorphic Rocks in the Maksyutov Complex, Ural Mountains, Russia
The Maksyutov metamorphic complex is the first locality where coesite pseudomorphs in garnet were described. The importance of this discovery was not understood until ultrahigh-pressure (UHP)