Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Liyan MA; Yuejun WANG; Weiming FAN; Hongyan GENG; Yongfeng CAI; Hong ZHONG; Huichuan LIU; Xiaowan XING

doi:10.1016/j.gr.2013.04.010

Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Liyan MA, Yuejun WANG^*, Weiming FAN, Hongyan GENG, Yongfeng CAI, Hong ZHONG, Huichuan LIU, Xiaowan XING

^*Corresponding author for this work

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

88 Citations (Scopus)

Abstract

This study reports new zircon U-Pb and Hf isotopes and whole-rock elemental and Sr-Nd isotopic data for the gneissic granite and leucogranite from the Nabang metamorphic zone, Yingjiang area (West Yunnan, SW China). The metamorphosed granitoids crystallized during the early Eocene (~55-50Ma) with zircons showing ε_Hf(t) values from +11 to -5.3 and crustal model ages of 1.5 to 0.42Ga, comparable to those of coeval I-type granitoids from the Gangdese batholith, southern Lhasa. The rocks are characterized by metaluminous and weakly peraluminous hornblende-bearing gneissic granites with A/CNK=0.95-1.09, Na₂O>K₂O, coupled with low initial Sr isotopic values of 0.7049-0.7070 and high ε_Nd(t) values from +1.1 to -7.1. The rocks were derived from crustal materials involving ancient upper crust/sedimentary and juvenile mantle-derived rocks. Together with available data from nearby regions, it is proposed that the early Eocene granitoids in the Nabang and Tengliang area can be correlated to the Gangdese granitoids and represent the southeastward continuation of the magmatic arc resulting from the Neotethyan subduction in southern Tibet. The petrogenesis of early Eocene granitoids in western Yunnan was probably related to the rollback of the subducting Neotethyan slab that caused the remelting of the crustal materials newly modified by the underplated basaltic magma.

Original language	English
Pages (from-to)	401-419
Number of pages	19
Journal	Gondwana Research
Volume	25
Issue number	1
DOIs	https://doi.org/10.1016/j.gr.2013.04.010
Publication status	Published - Jan 2014
Externally published	Yes

Bibliographical note

We wish to acknowledge T-P. Peng, F. Guo, and X-P. Xia, for their help during the fieldwork, and Y. Liu and L. Qi and H. Zhang for their assistance during geochemical analyses and LA-ICPMS dating. We are also grateful to Dr. Y-H Zhang for polishing the English. We thank Associate Editor Z-M Zhang and two anonymous reviewers for their critical and constructive review and comments on this paper.

Funding

This study was jointly supported by the Natural Science Foundation of China ( 40830319 and 40825009 ), “Closed of Eastern Paleotethys Ocean and Assembly of South China continents” ( 41190073 ) that is the 3rd research project of a Major NSFC Program ( 41190070 ), Most Special Fund from the State Key Laboratory of Continental Dynamics, Northwest University ( BJ081331 ), State Key Laboratory of Ore Deport Geochemistry, CAS ( 201301 ) and GIG, CAS ( GIGCAS-135-Y234 151001 ). This is a contribution to Guangzhou Institute of Geochemistry, Chinese Academy of Sciences.

Keywords

Gangdese belt
I-type gneissic granite
Nd-Hf isotopic composition
West Yingjiang
Zircons U-Pb geochronology

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title = "Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths",

abstract = "This study reports new zircon U-Pb and Hf isotopes and whole-rock elemental and Sr-Nd isotopic data for the gneissic granite and leucogranite from the Nabang metamorphic zone, Yingjiang area (West Yunnan, SW China). The metamorphosed granitoids crystallized during the early Eocene (~55-50Ma) with zircons showing εHf(t) values from +11 to -5.3 and crustal model ages of 1.5 to 0.42Ga, comparable to those of coeval I-type granitoids from the Gangdese batholith, southern Lhasa. The rocks are characterized by metaluminous and weakly peraluminous hornblende-bearing gneissic granites with A/CNK=0.95-1.09, Na2O>K2O, coupled with low initial Sr isotopic values of 0.7049-0.7070 and high εNd(t) values from +1.1 to -7.1. The rocks were derived from crustal materials involving ancient upper crust/sedimentary and juvenile mantle-derived rocks. Together with available data from nearby regions, it is proposed that the early Eocene granitoids in the Nabang and Tengliang area can be correlated to the Gangdese granitoids and represent the southeastward continuation of the magmatic arc resulting from the Neotethyan subduction in southern Tibet. The petrogenesis of early Eocene granitoids in western Yunnan was probably related to the rollback of the subducting Neotethyan slab that caused the remelting of the crustal materials newly modified by the underplated basaltic magma.",

keywords = "Gangdese belt, I-type gneissic granite, Nd-Hf isotopic composition, West Yingjiang, Zircons U-Pb geochronology",

author = "Liyan MA and Yuejun WANG and Weiming FAN and Hongyan GENG and Yongfeng CAI and Hong ZHONG and Huichuan LIU and Xiaowan XING",

note = "We wish to acknowledge T-P. Peng, F. Guo, and X-P. Xia, for their help during the fieldwork, and Y. Liu and L. Qi and H. Zhang for their assistance during geochemical analyses and LA-ICPMS dating. We are also grateful to Dr. Y-H Zhang for polishing the English. We thank Associate Editor Z-M Zhang and two anonymous reviewers for their critical and constructive review and comments on this paper.",

year = "2014",

month = jan,

doi = "10.1016/j.gr.2013.04.010",

language = "English",

volume = "25",

pages = "401--419",

journal = "Gondwana Research",

issn = "1342-937X",

publisher = "Elsevier Inc.",

number = "1",

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T1 - Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

AU - MA, Liyan

AU - WANG, Yuejun

AU - FAN, Weiming

AU - GENG, Hongyan

AU - CAI, Yongfeng

AU - ZHONG, Hong

AU - LIU, Huichuan

AU - XING, Xiaowan

N1 - We wish to acknowledge T-P. Peng, F. Guo, and X-P. Xia, for their help during the fieldwork, and Y. Liu and L. Qi and H. Zhang for their assistance during geochemical analyses and LA-ICPMS dating. We are also grateful to Dr. Y-H Zhang for polishing the English. We thank Associate Editor Z-M Zhang and two anonymous reviewers for their critical and constructive review and comments on this paper.

PY - 2014/1

Y1 - 2014/1

N2 - This study reports new zircon U-Pb and Hf isotopes and whole-rock elemental and Sr-Nd isotopic data for the gneissic granite and leucogranite from the Nabang metamorphic zone, Yingjiang area (West Yunnan, SW China). The metamorphosed granitoids crystallized during the early Eocene (~55-50Ma) with zircons showing εHf(t) values from +11 to -5.3 and crustal model ages of 1.5 to 0.42Ga, comparable to those of coeval I-type granitoids from the Gangdese batholith, southern Lhasa. The rocks are characterized by metaluminous and weakly peraluminous hornblende-bearing gneissic granites with A/CNK=0.95-1.09, Na2O>K2O, coupled with low initial Sr isotopic values of 0.7049-0.7070 and high εNd(t) values from +1.1 to -7.1. The rocks were derived from crustal materials involving ancient upper crust/sedimentary and juvenile mantle-derived rocks. Together with available data from nearby regions, it is proposed that the early Eocene granitoids in the Nabang and Tengliang area can be correlated to the Gangdese granitoids and represent the southeastward continuation of the magmatic arc resulting from the Neotethyan subduction in southern Tibet. The petrogenesis of early Eocene granitoids in western Yunnan was probably related to the rollback of the subducting Neotethyan slab that caused the remelting of the crustal materials newly modified by the underplated basaltic magma.

AB - This study reports new zircon U-Pb and Hf isotopes and whole-rock elemental and Sr-Nd isotopic data for the gneissic granite and leucogranite from the Nabang metamorphic zone, Yingjiang area (West Yunnan, SW China). The metamorphosed granitoids crystallized during the early Eocene (~55-50Ma) with zircons showing εHf(t) values from +11 to -5.3 and crustal model ages of 1.5 to 0.42Ga, comparable to those of coeval I-type granitoids from the Gangdese batholith, southern Lhasa. The rocks are characterized by metaluminous and weakly peraluminous hornblende-bearing gneissic granites with A/CNK=0.95-1.09, Na2O>K2O, coupled with low initial Sr isotopic values of 0.7049-0.7070 and high εNd(t) values from +1.1 to -7.1. The rocks were derived from crustal materials involving ancient upper crust/sedimentary and juvenile mantle-derived rocks. Together with available data from nearby regions, it is proposed that the early Eocene granitoids in the Nabang and Tengliang area can be correlated to the Gangdese granitoids and represent the southeastward continuation of the magmatic arc resulting from the Neotethyan subduction in southern Tibet. The petrogenesis of early Eocene granitoids in western Yunnan was probably related to the rollback of the subducting Neotethyan slab that caused the remelting of the crustal materials newly modified by the underplated basaltic magma.

KW - Gangdese belt

KW - I-type gneissic granite

KW - Nd-Hf isotopic composition

KW - West Yingjiang

KW - Zircons U-Pb geochronology

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U2 - 10.1016/j.gr.2013.04.010

DO - 10.1016/j.gr.2013.04.010

M3 - Journal Article (refereed)

AN - SCOPUS:84886952346

SN - 1342-937X

VL - 25

SP - 401

EP - 419

JO - Gondwana Research

JF - Gondwana Research

IS - 1

ER -

Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Abstract

Bibliographical note

Funding

Keywords

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