The age of metamorphism of diamondiferous rocks determined with shrimp dating of zircon

J. Hermann; D. Rubatto; A. V. Korsakov; V. S. Shatsky

The age of metamorphism of diamondiferous rocks determined with shrimp dating of zircon

J. Hermann^*, D. Rubatto, A. V. Korsakov, V. S. Shatsky

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

In situ dating of zircon domains with a Sensitive High Resolution Ion Microprobe (SHRIMP) has been proved to be the best way to determine the age of peak metamorphic conditions in the diamondiferous, deeply subducted Kokchetav rocks. Three independent studies obtained within error-consistent results, providing evidence for peak metamorphic conditions at about 530 Ma. These studies demonstrated through mineral inclusions that the dated zircon crystals formed under peak metamorphic conditions, within the diamond stability field. Mineral inclusions indicate that zircon formed not only at the metamorphic peak but also during the retrograde evolution at granulite- to amphibolite-facies conditions. The ages of the retrograde zircon domains are within error not distinguishable from the age of peak metamorphism. This provides evidence for very fast exhumation rates of minimum 1.8 cm/yr from diamond to granulite-facies metamorphism and high cooling rates of > 40 °C/Ma.

Original language	English
Pages (from-to)	513-520
Number of pages	8
Journal	Geologiya i Geofizika
Volume	47
Issue number	4
Publication status	Published - 2006

Cite this

@article{3125d9b9560d4455aad4df98b4833a8d,

title = "The age of metamorphism of diamondiferous rocks determined with shrimp dating of zircon",

abstract = "In situ dating of zircon domains with a Sensitive High Resolution Ion Microprobe (SHRIMP) has been proved to be the best way to determine the age of peak metamorphic conditions in the diamondiferous, deeply subducted Kokchetav rocks. Three independent studies obtained within error-consistent results, providing evidence for peak metamorphic conditions at about 530 Ma. These studies demonstrated through mineral inclusions that the dated zircon crystals formed under peak metamorphic conditions, within the diamond stability field. Mineral inclusions indicate that zircon formed not only at the metamorphic peak but also during the retrograde evolution at granulite- to amphibolite-facies conditions. The ages of the retrograde zircon domains are within error not distinguishable from the age of peak metamorphism. This provides evidence for very fast exhumation rates of minimum 1.8 cm/yr from diamond to granulite-facies metamorphism and high cooling rates of > 40 °C/Ma.",

keywords = "Diamond, Kokchetav, SHRIMP, U-Pb dating, Zircon",

author = "J. Hermann and D. Rubatto and Korsakov, {A. V.} and Shatsky, {V. S.}",

year = "2006",

language = "English",

volume = "47",

pages = "513--520",

journal = "Geologiya i Geofizika",

issn = "0016-7886",

publisher = "Izdatel'stvo Sibirskogo Otdeleniya Rossiiskoi Akademii Nauk/Publishing House of the Russian Academy of Sciences",

number = "4",

}

TY - JOUR

T1 - The age of metamorphism of diamondiferous rocks determined with shrimp dating of zircon

AU - Hermann, J.

AU - Rubatto, D.

AU - Korsakov, A. V.

AU - Shatsky, V. S.

PY - 2006

Y1 - 2006

N2 - In situ dating of zircon domains with a Sensitive High Resolution Ion Microprobe (SHRIMP) has been proved to be the best way to determine the age of peak metamorphic conditions in the diamondiferous, deeply subducted Kokchetav rocks. Three independent studies obtained within error-consistent results, providing evidence for peak metamorphic conditions at about 530 Ma. These studies demonstrated through mineral inclusions that the dated zircon crystals formed under peak metamorphic conditions, within the diamond stability field. Mineral inclusions indicate that zircon formed not only at the metamorphic peak but also during the retrograde evolution at granulite- to amphibolite-facies conditions. The ages of the retrograde zircon domains are within error not distinguishable from the age of peak metamorphism. This provides evidence for very fast exhumation rates of minimum 1.8 cm/yr from diamond to granulite-facies metamorphism and high cooling rates of > 40 °C/Ma.

AB - In situ dating of zircon domains with a Sensitive High Resolution Ion Microprobe (SHRIMP) has been proved to be the best way to determine the age of peak metamorphic conditions in the diamondiferous, deeply subducted Kokchetav rocks. Three independent studies obtained within error-consistent results, providing evidence for peak metamorphic conditions at about 530 Ma. These studies demonstrated through mineral inclusions that the dated zircon crystals formed under peak metamorphic conditions, within the diamond stability field. Mineral inclusions indicate that zircon formed not only at the metamorphic peak but also during the retrograde evolution at granulite- to amphibolite-facies conditions. The ages of the retrograde zircon domains are within error not distinguishable from the age of peak metamorphism. This provides evidence for very fast exhumation rates of minimum 1.8 cm/yr from diamond to granulite-facies metamorphism and high cooling rates of > 40 °C/Ma.

KW - Diamond

KW - Kokchetav

KW - SHRIMP

KW - U-Pb dating

KW - Zircon

UR - http://www.scopus.com/inward/record.url?scp=33845705356&partnerID=8YFLogxK

M3 - Article

SN - 0016-7886

VL - 47

SP - 513

EP - 520

JO - Geologiya i Geofizika

JF - Geologiya i Geofizika

IS - 4

ER -

The age of metamorphism of diamondiferous rocks determined with shrimp dating of zircon

Abstract

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