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 PublicationsJournal Article (refereed)

52 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 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.

Original languageEnglish
Pages (from-to)401-419
Number of pages19
JournalGondwana Research
Volume25
Issue number1
DOIs
Publication statusPublished - Jan 2014
Externally publishedYes

Fingerprint

petrogenesis
Eocene
rock
zircon
leucogranite
batholith
upper crust
hornblende
slab
subduction
granite
magma
isotope
mantle
material

Keywords

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

Cite this

MA, Liyan ; WANG, Yuejun ; FAN, Weiming ; GENG, Hongyan ; CAI, Yongfeng ; ZHONG, Hong ; LIU, Huichuan ; XING, Xiaowan. / Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths. In: Gondwana Research. 2014 ; Vol. 25, No. 1. pp. 401-419.
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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.",
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author = "Liyan MA and Yuejun WANG and Weiming FAN and Hongyan GENG and Yongfeng CAI and Hong ZHONG and Huichuan LIU and Xiaowan XING",
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Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths. / MA, Liyan; WANG, Yuejun; FAN, Weiming; GENG, Hongyan; CAI, Yongfeng; ZHONG, Hong; LIU, Huichuan; XING, Xiaowan.

In: Gondwana Research, Vol. 25, No. 1, 01.2014, p. 401-419.

Research output: Journal PublicationsJournal Article (refereed)

TY - JOUR

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

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

VL - 25

SP - 401

EP - 419

JO - Gondwana Research

JF - Gondwana Research

SN - 1342-937X

IS - 1

ER -