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2009•Acta Geological SinicaRequires access

SHRIMP U-Pb Dating of Zircon from Gneiss in the Tongmai Region:Evidence for the India-Eurasia Collision Time

Xia Bin

Open publisher page 5 citations

Abstract

The SHRIMP U-Pb dating of the gneiss in the Tongmai region shows that: ① the mean U-Pb age(42Ma) for the metamorphic zircon and the younger crust of metamorphic compound zircon is in Mid-Eocene epoch,which is consistent with the peak age of the continental-continental collision.The starting time of the India-Eurasia collision should be little earlier than 42Ma.② The oldest age for the older core of the compound metamorphic zircon(inherited zircon) is about 201Ma,equivalent to early Jurassic,indicating that the age of the sedimentary protolithic of the gneiss in the Tongmai region should be later than Triassic.③ The genesis and types of the zircon and their significance,the age of the gneiss,and the collision time of the India-Eurasia continents are discussed in the paper.

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What this paper is about

The SHRIMP U-Pb dating of the gneiss in the Tongmai region shows that: ① the mean U-Pb age(42Ma) for the metamorphic zircon and the younger crust of metamorphic compound zircon is in Mid-Eocene epoch,which is consistent with the peak age of the continental-continental collision.The starting time of the India-Eurasia collision should be little earlier than 42Ma.② The oldest age for the older core of the compound metamorphic zircon(inherited zircon) is about 201Ma,equivalent to early Jurassic,indicating that the age of the sedimentary protolithic of the gneiss in the Tongmai region should be later than Triassic.③ The genesis and types of the zircon and their significance,the age of the gneiss,and the collision time of the India-Eurasia continents are discussed in the paper.

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Available abstract

The SHRIMP U-Pb dating of the gneiss in the Tongmai region shows that: ① the mean U-Pb age(42Ma) for the metamorphic zircon and the younger crust of metamorphic compound zircon is in Mid-Eocene epoch,which is consistent with the peak age of the continental-continental collision.The starting time of the India-Eurasia collision should be little earlier than 42Ma.② The oldest age for the older core of the compound metamorphic zircon(inherited zircon) is about 201Ma,equivalent to early Jurassic,indicating that the age of the sedimentary protolithic of the gneiss in the Tongmai region should be later than Triassic.③ The genesis and types of the zircon and their significance,the age of the gneiss,and the collision time of the India-Eurasia continents are discussed in the paper.

Key concepts: Zircon, Gneiss, Geology, Metamorphic rock, Shrimp, Geochemistry, Crust, Continental crust

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SHRIMP U-Pb Dating of Zircon from Gneiss in the Tongmai Region:Evidence for the India-Eurasia Collision Time — Research Paper | ScholarLens