Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China : Implications for Late Paleozoic crustal growth in Central Asia

Jiyuan YIN; Wen CHEN; Wenjiao XIAO; Chao YUAN; Min SUN; Gongjian TANG; Shun YU; Xiaoping LONG; Keda CAI; Hongyan GENG; Yan ZHANG; Xinyu LIU

doi:10.1016/j.tecto.2015.01.005

Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China : Implications for Late Paleozoic crustal growth in Central Asia

Jiyuan YIN, Wen CHEN, Wenjiao XIAO^*, Chao YUAN, Min SUN, Gongjian TANG, Shun YU, Xiaoping LONG, Keda CAI, Hongyan GENG, Yan ZHANG, Xinyu LIU

^*Corresponding author for this work

Research output: Journal Publications › Journal Article (refereed) › peer-review

81 Citations (Scopus)

Abstract

Sanukitoids and their equivalents are rare subduction-related rock types that have been found in modern arc settings and in Late Archean sequences. The investigation of sanukitoids is of particular importance to a better understanding of crust-forming processes and continental growth. In this paper we report zircon U-Pb and Ar-Ar ages and major element, trace element, and Sr-Nd-Hf isotope data for the Bieluagaxi dioritic pluton and dikes from the southern part of the West Junggar, NW China. These rocks formed in the Early Permian and show a remarkable geochemical affinity with Cenozoic sanukitoids of the Setouchi Volcanic Belt of SW Japan with high Mg^# (48-73) values, Cr (54-539 ppm), Ni (21-197 ppm) contents and Th/La (0.15-0.37) ratios and low Sr/Y ratios (16-27) and Sr (263-442 ppm) contents. They may be generated by the partial melting of subducting sediments, and subsequent melt-mantle interaction. Additionally, the sanukitoids are also widespread in the Karamay-Baogutu area of West Junggar accompanied by high Sr (average 713 ppm) contents and Sr/Y (50-130) ratios, and low Y (6.9-12.6 ppm) contents. The difference in petrochemical characteristics between the Baogutu-Karamay and Bieluagaxi sanukitoids can be explained by the difference in depth of initial melting, origin composition and fractional crystallization. The Baogutu-Karamay sanukitoids were probably formed under eclogitic conditions, while the Bieluagaxi sanukitoids were at a shallower depth. Moreover, the compositional similarity between continental-crust forming rocks and the Bieluagaxi sanukitoids suggests that the sanukitoids genesis could be closely related to the process of continental crust formation. The Late Carboniferous-Early Permian sanukitoids in the West Junggar may be an indicator of anomalous thermal activity. Ridge subduction may play a crucial role in the evolution and growth of the continental crust in Central Asia.

Original language	English
Pages (from-to)	385-397
Number of pages	13
Journal	Tectonophysics
Volume	662
Early online date	20 Jan 2015
DOIs	https://doi.org/10.1016/j.tecto.2015.01.005
Publication status	Published - 1 Nov 2015
Externally published	Yes

Funding

Inspired by Brian Windley's ridge subduction model, we have proposed Late Carboniferous–Early Permian ridge subduction in West Junggar, for which we express our heartfelt thanks. We thank Timothy Kusky and two reviewers for their constructive comments that have greatly improved the manuscript. This study was supported by National Science Foundation of China (Grant nos. 41390441 , 41473053 , 41203026 , 41273012 , 41230207 , 41373034 , 41190075 ), the China Geological Survey (Grant no. 12120113015600 ), the Chinese Ministry of Land and Resources (Grant no. 201211074-05 ), China Scholarship Council (File no. 201409110006 ), and China Postdoctoral Science Foundation ( 138226 ). This is a contribution to IGCP 592.

Keywords

Central Asia
Crustal growth
Late Paleozoic
Sanukitoid
West Junggar

Access to Document

10.1016/j.tecto.2015.01.005

Cite this

@article{cdef322faa134a548a6a8db13f28bcf8,

title = "Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China : Implications for Late Paleozoic crustal growth in Central Asia",

abstract = "Sanukitoids and their equivalents are rare subduction-related rock types that have been found in modern arc settings and in Late Archean sequences. The investigation of sanukitoids is of particular importance to a better understanding of crust-forming processes and continental growth. In this paper we report zircon U-Pb and Ar-Ar ages and major element, trace element, and Sr-Nd-Hf isotope data for the Bieluagaxi dioritic pluton and dikes from the southern part of the West Junggar, NW China. These rocks formed in the Early Permian and show a remarkable geochemical affinity with Cenozoic sanukitoids of the Setouchi Volcanic Belt of SW Japan with high Mg# (48-73) values, Cr (54-539 ppm), Ni (21-197 ppm) contents and Th/La (0.15-0.37) ratios and low Sr/Y ratios (16-27) and Sr (263-442 ppm) contents. They may be generated by the partial melting of subducting sediments, and subsequent melt-mantle interaction. Additionally, the sanukitoids are also widespread in the Karamay-Baogutu area of West Junggar accompanied by high Sr (average 713 ppm) contents and Sr/Y (50-130) ratios, and low Y (6.9-12.6 ppm) contents. The difference in petrochemical characteristics between the Baogutu-Karamay and Bieluagaxi sanukitoids can be explained by the difference in depth of initial melting, origin composition and fractional crystallization. The Baogutu-Karamay sanukitoids were probably formed under eclogitic conditions, while the Bieluagaxi sanukitoids were at a shallower depth. Moreover, the compositional similarity between continental-crust forming rocks and the Bieluagaxi sanukitoids suggests that the sanukitoids genesis could be closely related to the process of continental crust formation. The Late Carboniferous-Early Permian sanukitoids in the West Junggar may be an indicator of anomalous thermal activity. Ridge subduction may play a crucial role in the evolution and growth of the continental crust in Central Asia.",

keywords = "Central Asia, Crustal growth, Late Paleozoic, Sanukitoid, West Junggar",

author = "Jiyuan YIN and Wen CHEN and Wenjiao XIAO and Chao YUAN and Min SUN and Gongjian TANG and Shun YU and Xiaoping LONG and Keda CAI and Hongyan GENG and Yan ZHANG and Xinyu LIU",

year = "2015",

month = nov,

day = "1",

doi = "10.1016/j.tecto.2015.01.005",

language = "English",

volume = "662",

pages = "385--397",

journal = "Tectonophysics",

issn = "0040-1951",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China : Implications for Late Paleozoic crustal growth in Central Asia

AU - YIN, Jiyuan

AU - CHEN, Wen

AU - XIAO, Wenjiao

AU - YUAN, Chao

AU - SUN, Min

AU - TANG, Gongjian

AU - YU, Shun

AU - LONG, Xiaoping

AU - CAI, Keda

AU - GENG, Hongyan

AU - ZHANG, Yan

AU - LIU, Xinyu

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Sanukitoids and their equivalents are rare subduction-related rock types that have been found in modern arc settings and in Late Archean sequences. The investigation of sanukitoids is of particular importance to a better understanding of crust-forming processes and continental growth. In this paper we report zircon U-Pb and Ar-Ar ages and major element, trace element, and Sr-Nd-Hf isotope data for the Bieluagaxi dioritic pluton and dikes from the southern part of the West Junggar, NW China. These rocks formed in the Early Permian and show a remarkable geochemical affinity with Cenozoic sanukitoids of the Setouchi Volcanic Belt of SW Japan with high Mg# (48-73) values, Cr (54-539 ppm), Ni (21-197 ppm) contents and Th/La (0.15-0.37) ratios and low Sr/Y ratios (16-27) and Sr (263-442 ppm) contents. They may be generated by the partial melting of subducting sediments, and subsequent melt-mantle interaction. Additionally, the sanukitoids are also widespread in the Karamay-Baogutu area of West Junggar accompanied by high Sr (average 713 ppm) contents and Sr/Y (50-130) ratios, and low Y (6.9-12.6 ppm) contents. The difference in petrochemical characteristics between the Baogutu-Karamay and Bieluagaxi sanukitoids can be explained by the difference in depth of initial melting, origin composition and fractional crystallization. The Baogutu-Karamay sanukitoids were probably formed under eclogitic conditions, while the Bieluagaxi sanukitoids were at a shallower depth. Moreover, the compositional similarity between continental-crust forming rocks and the Bieluagaxi sanukitoids suggests that the sanukitoids genesis could be closely related to the process of continental crust formation. The Late Carboniferous-Early Permian sanukitoids in the West Junggar may be an indicator of anomalous thermal activity. Ridge subduction may play a crucial role in the evolution and growth of the continental crust in Central Asia.

AB - Sanukitoids and their equivalents are rare subduction-related rock types that have been found in modern arc settings and in Late Archean sequences. The investigation of sanukitoids is of particular importance to a better understanding of crust-forming processes and continental growth. In this paper we report zircon U-Pb and Ar-Ar ages and major element, trace element, and Sr-Nd-Hf isotope data for the Bieluagaxi dioritic pluton and dikes from the southern part of the West Junggar, NW China. These rocks formed in the Early Permian and show a remarkable geochemical affinity with Cenozoic sanukitoids of the Setouchi Volcanic Belt of SW Japan with high Mg# (48-73) values, Cr (54-539 ppm), Ni (21-197 ppm) contents and Th/La (0.15-0.37) ratios and low Sr/Y ratios (16-27) and Sr (263-442 ppm) contents. They may be generated by the partial melting of subducting sediments, and subsequent melt-mantle interaction. Additionally, the sanukitoids are also widespread in the Karamay-Baogutu area of West Junggar accompanied by high Sr (average 713 ppm) contents and Sr/Y (50-130) ratios, and low Y (6.9-12.6 ppm) contents. The difference in petrochemical characteristics between the Baogutu-Karamay and Bieluagaxi sanukitoids can be explained by the difference in depth of initial melting, origin composition and fractional crystallization. The Baogutu-Karamay sanukitoids were probably formed under eclogitic conditions, while the Bieluagaxi sanukitoids were at a shallower depth. Moreover, the compositional similarity between continental-crust forming rocks and the Bieluagaxi sanukitoids suggests that the sanukitoids genesis could be closely related to the process of continental crust formation. The Late Carboniferous-Early Permian sanukitoids in the West Junggar may be an indicator of anomalous thermal activity. Ridge subduction may play a crucial role in the evolution and growth of the continental crust in Central Asia.

KW - Central Asia

KW - Crustal growth

KW - Late Paleozoic

KW - Sanukitoid

KW - West Junggar

UR - http://www.scopus.com/inward/record.url?scp=84961342540&partnerID=8YFLogxK

U2 - 10.1016/j.tecto.2015.01.005

DO - 10.1016/j.tecto.2015.01.005

M3 - Journal Article (refereed)

AN - SCOPUS:84961342540

SN - 0040-1951

VL - 662

SP - 385

EP - 397

JO - Tectonophysics

JF - Tectonophysics

ER -

Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China : Implications for Late Paleozoic crustal growth in Central Asia

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this