Topic
Terrane
About: Terrane is a research topic. Over the lifetime, 11025 publications have been published within this topic receiving 442596 citations. The topic is also known as: tectonostratigraphic terrane.
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TL;DR: In this article, the authors reported new data regarding the elemental and isotopic compositions of the KonglongXiang volcanic rocks (KVR; K2O/Na2O < 2 and low MgO contents) in the middle-western Lhasa terrane, Tibetan Plateau.
115 citations
TL;DR: Geologic and paleomagnetic data suggest that the Carolina slate belt and the adjacent Charlotte belt constitute an exotic terrane that was accreted to North America in early to middle Paleozoic time.
Abstract: An assemblage of Middle Cambrian Atlantic faunal province trilobites has been found in the rocks of the Carolina slate belt near Batesburg, South Carolina. Geologic and paleomagnetic data suggest that the Carolina slate belt and the adjacent Charlotte belt constitute an exotic terrane that was accreted to North America in early to middle Paleozoic time.
115 citations
TL;DR: In this article, the authors synthesised in seven plate tectonic reconstructions of the South Tasman Rise region from the mid-Cretaceous (95 Ma) to the Early Oligocene (34 Ma) from satellite-derived gravity data and shipboard swath-bathymetry and magnetic data collected in 1994 in the South Tasmania Rise region.
Abstract: The South Tasman Rise is a large submarine plateau of continental origin, located south of Tasmania. In the light of satellite‐derived gravity data and shipboard swath‐bathymetry and magnetic data collected in 1994 in the South Tasman Rise region, this paper re‐examines the sea‐floor spreading history of the surrounding ocean basins (northeastern Australian‐Antarctic Basin and southwestern Tasman Sea). This information is synthesised in seven plate tectonic reconstructions of the South Tasman Rise region from the mid‐Cretaceous (95 Ma) to the Early Oligocene (34 Ma). Our interpretation and model confirm that the South Tasman Rise is composed of two distinct terranes. A western domain, limited to the west by a transform margin along the Tasman Fracture Zone and to the east by a N170°E oriented boundary at 146.5°E, was initially attached to Antarctica. The western terrane rifted away from Antarctica in the Late Paleocene/Early Eocene and underwent severe wrench deformation as the Antarctic plate moved south...
115 citations
TL;DR: Amphibolite lenses that locally crop out below the serpentinite sole at the base of the ophiolite of New Caledonia (termed Peridotite Nappe) recrystallized in the high-temperature amphibolite facies and thus sharply contrast with blueschists and eclogites of the Eocene metamorphic complex as discussed by the authors.
Abstract: Amphibolite lenses that locally crop out below the serpentinite sole at the base of the ophiolite of New Caledonia (termed Peridotite Nappe) recrystallized in the high-temperature amphibolite facies and thus sharply contrast with blueschists and eclogites of the Eocene metamorphic complex. Amphibolites mostly display the geochemical features of MORB with a slight Nb depletion and thus are similar to the youngest (Late Paleocene-Eocene) BABB components of the allochthonous Poya Terrane. Thermochronological data from hornblende ( 40Ar/ 39Ar), zircon, and sphene (U-Pb) suggest that these mafic rocks recrystallized at ∼56Ma. Using various geothermobarometers provides a rough estimate of peak recrystallization conditions of ∼0.5GPa at ∼800-950C. The thermal gradient inferred from the metamorphic assemblage (∼60°Ckm -1), geometrical relationships, and geochemical similarity suggest that these mafic rocks belong to the oceanic crust of the lower plate of the subduction/obduction system and recrystallized when they subducted below young and hot oceanic lithosphere. They were detached from the down-going plate and finally thrust onto unmetamorphosed Poya Terrane basalts. This and the occurrence of slab melts at ∼53Ma suggest that subduction inception occurred at or near to the spreading ridge of the South Loyalty Basin at ∼56Ma. © 2012. American Geophysical Union. All Rights Reserved.
115 citations
01 Jan 1987
TL;DR: Petrological, geochronological and isotope geochemical studies over the past ten years are reviewed suggesting the following metamorphic and igneous evolution of the Cycladic crystalline complex as discussed by the authors.
Abstract: Petrological, geochronological and isotope geochemical studies over the past ten years are reviewed suggesting the following metamorphic and igneous evolution of the Cycladic crystalline complex:
1)
Formation of high-pressure blueschist facies assemblages during the Eocene (40–45 Ma) as a result of continental collision processes.
2)
During the Miocene (20–25 Ma) the Cycladic terrane became regionally overprinted by greenschist facies assemblages with local development of thermal domes. Isotopic studies show that infiltration of fluids is responsible for the propagation of the overprint.
3)
Shortly after the culmination of the Miocene event (12–18 Ma) granitoids intruded on a number of islands, Ranging in composition from granodiorites and granites to monzonites the Cycladic granitoid province is interpreted to result from assimilation of crustal material by mantle-derived basaltic melts combined with fractional crystallization.
114 citations