Anticlockwise evolution of ultrahigh-temperature granulites within continental collision zone in southern India

Lithos ◽  
2006 ◽  
Vol 92 (3-4) ◽  
pp. 447-464 ◽  
Author(s):  
M SANTOSH ◽  
K SAJEEV
Keyword(s):  
Continental Collision ◽  
Southern India ◽  
Collision Zone ◽  
Ultrahigh Temperature

Processing of crust in the root of the Caledonian continental collision zone: the role of eclogitization

1997 ◽  
Vol 273 (1-2) ◽  
pp. 129-153 ◽  
Author(s):  
Håkon Austrheim ◽  
Muriel Erambert ◽  
Ane K. Engvik
Keyword(s):  
Continental Collision ◽  
Collision Zone

Ultrahigh-temperature metamorphism and decompression history of sapphirine granulites from Rajapalaiyam, southern India: implications for the formation of hot orogens during Gondwana assembly

2009 ◽  
Vol 147 (1) ◽  
pp. 42-58 ◽  
Author(s):  
T. TSUNOGAE ◽  
M. SANTOSH
Keyword(s):  
Southern India ◽  
Stability Field ◽  
Fine Grained ◽  
History Of ◽  
Peak Metamorphism ◽  
Gondwana Supercontinent ◽  
Isothermal Decompression ◽  
Ultrahigh Temperature ◽  
Late Neoproterozoic ◽  
Uht Metamorphism

AbstractSapphirine-bearing Mg–Al granulites from Rajapalaiyam in the southern part of the Madurai Block provide critical evidence for Late Neoproterozoic–Cambrian ultrahigh-temperature (UHT) metamorphism in southern India. Poikiloblastic garnet in quartzo-feldspathic and pelitic granulites contain inclusions of fine-grained subidioblastic to xenoblastic sapphirine associated with quartz, suggesting that the rocks underwent T > 1000°C peak metamorphism. Quartz inclusions in spinel within garnet are also regarded as clear evidence for a UHT condition. Inclusions of orthopyroxene within porphyroblastic garnet in the sapphirine-bearing rocks show the highest Al2O3 content of up to 10.3 wt%, suggesting T = 1050–1070°C and P = 8.5–9.5 kbar. Temperatures estimated from ternary feldspar and other geothermometers (T = 950–1000°C) further support extreme thermal metamorphism in this region. Xenoblastic spinel inclusions in sapphirine coexisting with quartz suggest that the spinel + quartz assemblage pre-dates the sapphirine + quartz assemblage, probably implying a cooling from T ~ 1050°C or an anticlockwise P–T path. The FMAS reaction sapphirine + quartz + garnet → orthopyroxene + sillimanite indicates a cooling from the sapphirine + quartz stability field after the peak metamorphism. Corona textures of orthopyroxene + cordierite (± sapphirine), orthopyroxene + sapphirine + cordierite, and cordierite + spinel around garnet suggest subsequent near-isothermal decompression followed by decompressional cooling toward T = 650–750°C and P = 4.5–5.5 kbar. The sapphirine–quartz association and related textures described in this study have an important bearing on the UHT metamorphism and exhumation history of the Madurai Block, as well as on the tectonic evolution of the continental deep crust in southern India. Our study provides a typical example for extreme metamorphism associated with collisional tectonics during the Late Neoproterozoic–Cambrian assembly of the Gondwana supercontinent.

scholarly journals Response of the U–Pb chronometer and trace elements in zircon to ultrahigh-temperature metamorphism: The Kadavur anorthosite complex, southern India

2011 ◽  
Vol 290 (3-4) ◽  
pp. 177-188 ◽  
Author(s):  
Ellen Kooijman ◽  
Dewashish Upadhyay ◽  
Klaus Mezger ◽  
Michael M. Raith ◽  
Jasper Berndt ◽  
...  
Keyword(s):  
Trace Elements ◽  
Southern India ◽  
Ultrahigh Temperature ◽  
Anorthosite Complex

A record of ultrahigh temperature metamorphism in the Dabie orogen during Triassic continental collision

2019 ◽  
Vol 72 ◽  
pp. 54-64 ◽  
Author(s):  
Hengcong Lei ◽  
Haijin Xu ◽  
Junfeng Zhang ◽  
Hans-Joachim Massonne ◽  
Penglei Liu
Keyword(s):  
Continental Collision ◽  
Dabie Orogen ◽  
Ultrahigh Temperature

scholarly journals Insight into collision zone dynamics from topography: numerical modelling results and observations

2012 ◽  
Vol 4 (2) ◽  
pp. 889-917 ◽  
Author(s):  
A. D. Bottrill ◽  
J. van Hunen ◽  
M. B. Allen
Keyword(s):  
Sea Level ◽  
Dynamic Models ◽  
Continental Collision ◽  
Dynamic Topography ◽  
Surface Uplift ◽  
Collision Zone ◽  
Phase Surface ◽  
Clastic Sedimentary ◽  
Back Arc ◽  
Topographic Evolution

Abstract. Dynamic models of subduction and continental collision are used to predict dynamic topography changes on the overriding plate. The modelling results show a distinct evolution of topography on the overriding plate, during subduction, continental collision and slab break-off. A prominent topographic feature is a temporary (few Myrs) deepening in the area of the back arc-basin after initial collision. This collisional mantle dynamic basin (CMDB) is caused by slab steepening drawing material away from the base of the overriding plate. Also during this initial collision phase, surface uplift is predicted on the overriding plate between the suture zone and the CMDB, due to the subduction of buoyant continental material and its isostatic compensation. After slab detachment, redistribution of stresses and underplating of the overriding plate causes the uplift to spread further into the overriding plate. This topographic evolution fits the stratigraphy found on the overriding plate of the Arabia-Eurasia collision zone in Iran and south east Turkey. The sedimentary record from the overriding plate contains Upper Oligocene-Lower Miocene marine carbonates deposited between terrestrial clastic sedimentary rocks, in units such as the Qom Formation and its lateral equivalents. This stratigraphy shows that during the Late Oligocene-Early Miocene the surface of the overriding plate sank below sea level before rising back above sea level, without major compressional deformation recorded in the same area. This uplift and subsidence pattern correlates well with our modelled topography changes.

High-pressure and ultrahigh-temperature metamorphism at Komateri, northern Madurai Block, southern India

2008 ◽  
Vol 33 (5-6) ◽  
pp. 395-413 ◽  
Author(s):  
Toshiaki Tsunogae ◽  
M. Santosh ◽  
Hiroyuki Ohyama ◽  
Kei Sato
Keyword(s):  
High Pressure ◽  
Southern India ◽  
Ultrahigh Temperature
Sign in / Sign up

Export Citation Format

Share Document