The early-stage evolution of the Neo-Tethys ocean: Evidence from granitoids in the middle Gangdese batholith, southern Tibet

Ye, Meng; Dong, Hao; Cong, Yuan; Xu, Zhiqin; Cao, Hui

doi:10.1016/j.jog.2016.01.003

Cited by 58 publications

(44 citation statements)

References 76 publications

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“…By combining the analytical data from our study with previous research results (M. F. Chu et al, ; M. F. Chu et al, ; Guo et al, ; Ji et al, ; Lang et al, ; S. W. Ma, Meng, et al, ; Meng, Dong, et al, , Meng, Xu, et al, ; Mo, Dong, Zhao, Zhou, et al, ; Pan et al, ; J. X. Tang et al, ; J. X. Tang et al, ; C. Wang et al, ; B. Xu et al, ; H. F. Zhang, Xu, et al, ), we have confirmed that the Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane were formed in a magmatic arc setting related to the northward subduction of the Neo‐Tethys oceanic lithosphere, indicating that the northward subduction of the Neo‐Tethys oceanic slab was initiated during the Late Triassic or even earlier. The northward subduction of the Neo‐Tethys oceanic slab probably occurred over a long period of time from the Triassic to the late Paleocene (Mo, Dong, Zhao, Zhou, et al, ).…”

Section: Discussionmentioning

confidence: 78%

“…The tectonic setting of Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane remains controversial. Some researchers suggest that the Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane were formed in a magmatic arc setting (continental margin arc or intra‐oceanic arc) related to the northward subduction of the Neo‐Tethys oceanic lithosphere (Huang et al, ; Ji et al, ; Kang et al, ; Lang et al, ; S. W. Ma, Meng, et al, , X. X. Ma, Xu, et al, , X. X. Ma, Yi, et al, ; Meng, Dong, et al, , Meng, Xu, et al, ; Pan et al, ; J. X. Tang et al, ; J. X. Tang et al, ; C. Wang et al, ), whereas others suggest that they were formed in a back‐arc setting in response to the southward subduction of the Bangong‐Nujiang oceanic lithosphere (Geng et al, ; Hsü et al, ; Liao et al, ; Shui et al, ; Song et al, ; D. C. Zhu et al, ; D. C. Zhu et al, ). Effective discrimination diagrams are key to discriminating the tectonic setting and addressing this controversy.…”

Section: Discussionmentioning

confidence: 99%

“…Magmatic activities in the southern Lhasa subterrane are related to the northward subduction of the Neo‐Tethys oceanic slab and the subsequent collision of the Indian and Eurasian plates (Figure c; M. F. Chu et al, ; Ji et al, ; Kang et al, ; Lang et al, ; J. X. Li et al, ; Meng, Dong, et al, ; S. W. Ma, Meng, et al, ; X. X. Ma, Xu, et al, ; X. X. Ma, Yi, et al, ; Meng, Xu, et al, ; Mo, Dong, Zhao, Guo, et al, ; C. Wang et al, ; B. Xu et al, ; A. Yin & Harrison, ). The Late Jurassic and Cretaceous arc volcanic rocks, granitoid intrusions, and porphyries in the southern Lhasa subterrane formed in a subduction geologic setting (M. F. Chu et al, ; Ji et al, ; Wen et al, ).…”

Section: Geologic Background and Samplesmentioning

confidence: 99%

“…The petrogenesis and tectonic setting of these rocks remain controversial subjects (Figure c), with some researchers suggesting that the Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane were formed in a magmatic arc setting (continental margin arc or intra‐oceanic arc) related to the northward subduction of the Neo‐Tethys oceanic lithosphere (Huang, Xu, Chen, Kang, & Dong, ; Ji et al, ; Kang et al, ; Lang et al, ; S. W. Ma, Meng, Xu, & Liu, ; X. X. Ma, Xu, Meert, & Santosh, ; X. X. Ma, Yi, & Xu, ; Meng, Dong, Cong, Xu, & Cao, ; Meng, Xu, et al, ; Pan et al, ; J. X. Tang et al, ; J. X. Tang et al, ; C. Wang et al, ), whereas other researchers suggesting that they are formed in a back‐arc setting in response to the southward subduction of the Bangong‐Nujiang oceanic lithosphere (Geng, Pan, Wang, Zhu, & Liao, ; Hsü, Pan, & Sengör, ; Liao et al, ; Shui, He, Zhang, & Lu, ; Song et al, ; D. C. Zhu et al, ; D. C. Zhu et al, ). To discuss the genesis and tectonic setting of Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane, most geochemical and geochronological studies on the Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane have focused on felsic rocks (M. F. Chu et al, ; Guo et al, ; Ji et al, ; Lang et al, ; S. W. Ma, Meng, et al, ; Meng, Dong, et al, ; Qu, Hou, Zaw, & Li, ; Tafti, Mortensen, Lang, Rebagliati, & Oliver, ; J. X. Tang et al, ; C. Wang et al, ; Wen et al, ; Z. M. Yang, Hou, Xia, Song, & Li, ; H. F. Zhang, Xu, et al, ). However, only a few mafic rocks of the Early Mesozoic have been identified along the southern Lhasa terrane (Kang et al, ; Meng, Xu, et al, ; J. S. Qiu, Wang, Zhao, & Yu, ; C. Wang et al, ; B. Xu et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…(d) Geologic map of the Xiongcun district (modified from Oliver, ). In Figure c, age dates for Late Triassic to Early Jurassic magmatic rocks are from W. Chen et al (); Y. H. Dong et al (); X. Dong and Zhang (); Geng et al (); Guo et al (); Z. H. He et al (); Ji et al (); Kang et al (); Lang et al (); S. W. Ma, Meng, et al (); Meng, Dong, et al (), Meng, Xu, et al (); J. H. Peng et al (); Song et al (); J. X. Tang et al (); C. Wang et al (); B. Xu et al (); Z. M. Yang et al (); H. F. Zhang, Xu, et al (); W. Zhu, Pan et al (); D. C. Zhu et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

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Composition and age of Jurassic diabase dikes in the Xiongcun porphyry copper–gold district, southern margin of the Lhasa terrane, Tibet, China: Petrogenesis and tectonic setting

et al. 2017

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Diabase dikes are extensively distributed in the Xiongcun porphyry copper–gold district in the southern margin of the Lhasa terrane. Here, we report zircon U–Pb ages determined by laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) along with Hf isotopic, whole‐rock elemental, and Sr–Nd–Pb isotopic data for these diabase dikes. Zircons from one of the Xiongcun diabase dikes yielded an emplacement age of 165.3 ± 1.0 Ma. The Xiongcun diabase dikes display subalkaline features and tholeiite compositions. They are enriched in large‐ion lithophile elements (e.g., Rb, Ba, and K) and light rare earth elements and are depleted in high‐field‐strength elements (e.g., Nb, Ta, and Ti). The Xiongcun diabase dikes exhibit relatively low ratios of (87Sr/86Sr)i (0.70386–0.70501), (206Pb/204Pb)i (18.15–18.40), (207Pb/204P)i (15.52–15.57), and (208Pb/204Pb)i (38.06–39.46) and relatively high values of εNd(t) (5.85–6.92) and εHf(t) (+12.58 to +14.03). Combined with previous research results, these findings suggest that the Xiongcun diabase dikes and Early Mesozoic magmatic rocks in the southern margin of the Lhasa terrane formed in an active continental margin magmatic arc setting related to the northward subduction of the Neo‐Tethys oceanic slab; however, the possibility that the Xiongcun diabase dikes were formed in an intra‐oceanic arc setting cannot be excluded. Their parental magmas were formed by the partial melting of the depleted mantle source that was modified by fluids released from the Neo‐Tethys oceanic slab. The magmas experienced fractional crystallization of olivine and clinopyroxene and underwent limited crustal contamination during magma emplacement. The ~165 Ma Xiongcun diabase dikes, which probably originated under an extensional stress condition in a magmatic arc setting, correspond to the timing of Middle Jurassic subduction‐related porphyry copper mineralization (161–172 Ma) in the southern margin of the Lhasa terrane, likely suggesting that this episode of mineralization occurred during a period of changing stress from compression to extension.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Geologic Background and Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Composition and age of Jurassic diabase dikes in the Xiongcun porphyry copper–gold district, southern margin of the Lhasa terrane, Tibet, China: Petrogenesis and tectonic setting

et al. 2017

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Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

et al. 2019

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The Xietongmen large deposit is the only known subduction-related porphyry Cu deposit in the Gangdese Belt, Tibet, which is composed of the No. I and No. II deposits. Previous work suggests that the No. I deposit is reduced while the No. II deposit is oxidized. However, it is ambiguous that both oxidized and reduced porphyry Cu deposits occur in close proximity, in the same tectonic setting, and within a short time period. Detailed examination of the ages, whole-rock geochemistry, zircon and apatite compositions of the Xietongmen No. I and No. II ore-bearing porphyries are conducted to investigate their magma characteristics and the genetic types of the Xietongmen No. I and No. II deposits. Zircon U-Pb dating results show that the Xietongmen No. I and No. II ore-bearing porphyries formed at 166.3 ± 2.6 Ma and 175.5 ± 1.0 Ma, respectively. The Xietongmen No. I and No. II ore-bearing porphyries have similar mineral assemblage (containing amphibole phenocryst), high Sr/Y ratios and negligible negative Eu anomalies, low Ti-in-zircon temperatures (633−749 and 633−763 C, respectively), which indicate that their magmas are water-rich. In addition, the Xietongmen No. I and No. II ore-bearing porphyries have: (a) high wholerock V/Sc ratios (10−15 and 8−16, respectively); (b) high zircon Ce 4+ /Ce 3+ and Eu N / Eu N * ratios, falling into the field of the ore-bearing intrusions in northern Chile; (c) low apatite Ce N /Ce N * ratios (0.97−1.02 and 0.99−1.02, respectively), which suggest that their magmas are oxidized. The estimated magmatic S contents, based on the magmatic apatite SO 3 contents, yield 0.0113−0.0507 wt% and 0.0012 −0.0118 wt%, respectively for the Xietongmen No. I and No. II ore-bearing porphyries, which suggest their magma are sulfur-rich. Hydrous, oxidized and sulfur-rich magmas are the parent magma of oxidized porphyry Cu deposits, together with the oxidized minerals of hematite and magnetite, therefore, both Xietongmen No. I and No. II deposit are oxidized porphyry Cu deposits, rather than that the Xietongmen No. I deposit is a reduced porphyry Cu deposit. K E Y W O R D S porphyry Cu deposit, zircon, apatite, oxidation state, Xietongmen

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Kinematics, strain patterns, rheology, and geochronology of Woka ductile shear zone: Product of uplift of Gangdese batholith and Great Counter Thrust activity

Feng

Wang

et al. 2020

Geological Journal

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The Woka ductile shear zone is located at the southern margin of the middle section of the Gangdese magmatic belt and southeast of Lhasa. This article is a systematic study of the Woka ductile shear zone and provides kinematics, strain patterns, rheology, temperature environment, and geochronological data of the shear zone, which have great significance for understanding of the uplift and extension process of the southern section of the Gangdese. All shear indicators, such as asymmetrical folds, rotated porphyroclasts, and S-C fabrics, developed in the shear zone indicate the shear sense of top-to-the-northwest with the shear nature of detachment. Mineral deformation thermometer and EBSD quartz fabric analysis indicate that the shear zone has experienced early high-temperature (550-650 C) deformation and post-superimposed low temperature (380-420 C) deformation. The differential stress (σ) of the ductile shear zone was 28.08-46.73 MPa. Strain rates (έ) ranged from 10 −10 to 10 −14 s −1 under a hightemperature environment (600 C) and 10 −12 to 10 −16 s −1 under a low-temperature environment (420 C). Three-dimensional strain ellipsoid measurements of the Woka ductile shear zone indicate that all deformed samples appear as prolate ellipsoids (LStype tectonites), which represent an elongate strain. The average kinematic vorticity of the Woka ductile shear zone is 0.93, implying that the shear zone was dominated by simple shear. The thickness of the ductile shear zone was reduced by 12-28%. Combined with the U-Pb zircon age of the protolith of granitic protomylonite, the 40 Ar/ 39 Ar sericite age of granitic mylonite (22.38 ± 0.31 Ma) can represent the shear age. The Woka shear zone studied in this article may have been formed by the Great Counter Thrust (GCT) activity and uplift of the Gangdese batholith during the transforming period of the Lhasa Terrane from extrusion to a lateral extension.

show abstract

The early-stage evolution of the Neo-Tethys ocean: Evidence from granitoids in the middle Gangdese batholith, southern Tibet

Cited by 58 publications

References 76 publications

Composition and age of Jurassic diabase dikes in the Xiongcun porphyry copper–gold district, southern margin of the Lhasa terrane, Tibet, China: Petrogenesis and tectonic setting

Composition and age of Jurassic diabase dikes in the Xiongcun porphyry copper–gold district, southern margin of the Lhasa terrane, Tibet, China: Petrogenesis and tectonic setting

Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

Kinematics, strain patterns, rheology, and geochronology of Woka ductile shear zone: Product of uplift of Gangdese batholith and Great Counter Thrust activity

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