All Title Author
Keywords Abstract

Publish in OALib Journal
ISSN: 2333-9721
APC: Only $99

ViewsDownloads

Relative Articles

Geochronology of the Malashan dome and its application in formation of the Southern Tibet detachment system (STDS) and Northern Himalayan gneiss domes (NHGD)
马拉山穹窿的活动时限及其在藏南拆离系—北喜马拉雅片麻岩穹窿形成机制的应用

Early Oligocene anatexis in the Yardoi gneiss dome, southern Tibet and geological implications

Experimental study on dehydration melting of natural biotite-plagioclase gneiss from High Himalayas and implications for Himalayan crust anatexis

Experimental study on dehydration melting of natural biotite-plagioclase gneiss from High Himalayas and implications for Himalayan crust anatexis

Early Oligocene anatexis in the Yardoi gneiss dome, southern Tibet and geological implications

The geochemical nature of apatites in high Sr/Y two-mica granites from the North Himalayan Gneiss Domes, southern Tibet
藏南北喜马拉雅穹窿高Sr/Y二云母花岗岩中磷灰石地球化学特征及其岩石学意义

云开地块印支期变质-深熔作用:混合岩、片麻岩锆石U-Pb年代学和Hf同位素证据
Indosinian Metamorphism and Anatexis in Yunkai Massif: Evidences from Zircon Geochronology and Hf Isotopes of Migmatites and Gneisses

Formation of sillimanite in the high-grade quartzofeldspathic gneisses and its relations with deformation-metamorphism-anatexis: A case study in the Larsemann Hills, East Antarctica
长英质高级片麻岩中夕线石的形成与变形-变质-深熔作用的关系 —— 以南极拉斯曼丘陵区为例

Petrogénesis de los thundereggs en domos riolíticos del centro del Chubut, Patagonia Petrogenesis of thundereggs in Eocene rhyolite domes of central Chubut, Patagonia

The Mid-Eocene subvolcanic field in the Lhunze-Qiaga area, Tethyan Himalaya, southern Tibet: A high-level magmatic suite related to the Yardio two-mica granite.
藏南特提斯喜马拉雅带始新世隆子-恰嘎次火山岩区:雅拉香波二云母花岗岩的高位岩浆体系

More...

Eocene high grade metamorphism and crustal anatexis in the North Himalaya Gneiss Domes, Southern Tibet

DOI: 10.1007/s11434-011-4805-4

Keywords: Tibet,Himalayan orogenic belt,North Himalayan Gneiss Domes,high-grade metamorphism,crustal anatexis

Full-Text   Cite this paper   Add to My Lib

Abstract:

Determination of the timing and geochemical nature of early metamorphic and anatectic events in the Himalayan orogen may provide key insights into the physical and chemical behavior of lower crustal materials during the early stage of tectonic evolution in large-scale collisional belts. The Yardoi gneiss dome is the easternmost dome of the North Himalayan Gneiss Domes (NHGD), and contains three types of amphibolites with distinct mineral assemblage, elemental and radiogenic isotope geochemistry, as well as various types of gneisses. SHRIMP zircon U/Pb analyses on the garnet amphibolite and garnet-bearing biotite granitic gneiss yield ages of nearly peak metamorphism at 45.0±1.0 Ma and 47.±1.8 Ma, respectively, which are 2 to 4 Ma older than the age for partial melting in migmatitic garnet amphibolite (43.5±1.3 Ma). Available data have demonstrated that ultra-high pressure metamorphism in the Tethyan Himalaya occurred at ~55 Ma, and high amphibolite facies to granulite facies metamorphism at 45 to 47 Ma. In addition, partial melting at thickened crustal conditions occurred at 43.5±1.3 Ma, which led to the formation of high Sr/Y ratios two-mica granites. The high-grade metamorphic rocks in the NHGD may represent the subducted front of the Indian continental lithosphere. In large collisional belts, fertile components in crustal materials could melt and form granitic melts with relatively high Na/K and Sr/Y ratios under thickened crustal conditions, significantly different from those formed by decompressional melting during rapid exhumation.

Full-Text

comments powered by Disqus

Contact Us

service@oalib.com

QQ:3279437679

微信:OALib Journal