Post-Collisional,Potassic Volcanism in the Saga Area,Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting
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  • 英文篇名:Post-Collisional,Potassic Volcanism in the Saga Area,Western Tibet: Implications for the Nature of the Mantle Source and Geodynamic Setting
  • 作者:Hui ; Zhao ; Jingsui ; Yang ; Fei ; Liu ; Jian ; Huang ; Li ; Zhang
  • 英文作者:Hui Zhao;Jingsui Yang;Fei Liu;Jian Huang;Li Zhang;Harbin Institute of Technology,Southern University of Science and Technology;Department of Earth and Space Sciences,Southern University of Science and Technology;Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences;Yunnan Tuocheng Industrial Co.;Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences;
  • 英文关键词:potassic volcanic rocks;;basalt;;Sr-Nd isotopes;;Saga area;;western Tibet
  • 中文刊名:ZDDY
  • 英文刊名:地球科学学刊(英文版)
  • 机构:Harbin Institute of Technology,Southern University of Science and Technology;Department of Earth and Space Sciences,Southern University of Science and Technology;Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences;Yunnan Tuocheng Industrial Co.;Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences;
  • 出版日期:2019-06-15
  • 出版单位:Journal of Earth Science
  • 年:2019
  • 期:v.30
  • 基金:supported by the Ministry of Science and Technology of China (No 2014DFR21270);; China Geological Survey (Nos. DD20160023-01, DD20160022-01);; the National Natural Science Foundation of China (Nos. 41720104009, 41672063, 41773029)
  • 语种:英文;
  • 页:ZDDY201903012
  • 页数:14
  • CN:03
  • ISSN:42-1788/P
  • 分类号:147-160
摘要
Post-collisional potassic and ultrapotassic volcanic rocks are widely distributed across the Tibetan Plateau,and they are considered to be indicators of evolving mantle dynamics.A suite of potassic basalts younger than 55 Ma from the Saga area of western Tibet has been reported.The geochemical characteristics of these rocks distinguish themselves from other potassic-ultrapotassic volcanic rocks in Tibet,such as positive Nb,Ta,and Ti anomalies and strong enrichment in large ion lithophile elements(LILE),suggesting that phlogopite,rutile and/or sphene might have originated from the mantle source.These basalts are also characterized by a very wide range of ~(87)Sr/~(86)Sr ratios(0.709 043–0.711 915)and relatively high ~(143)Nd/~(144)Nd ratios(0.512 426–0.512 470,ε_(Nd)=-4.60 to-3.87).We propose a petrogenetic model for the Saga potassic rocks in which the lithospheric mantle source was infiltrated by a volatilerich(H_2O,CO_2)and low-degree silicate melt derived from the asthenosphere in the Middle to Late Proterozoic.After the initial Indo-Asian collision,Neo-Tethyan slab breakoff resulted in the partial melting of the previously metasomatized lithospheric mantle and the formation of the Saga potassic rocks.It is likely that the eruption of these volcanic rocks lasted at least 10 Ma.
        Post-collisional potassic and ultrapotassic volcanic rocks are widely distributed across the Tibetan Plateau,and they are considered to be indicators of evolving mantle dynamics.A suite of potassic basalts younger than 55 Ma from the Saga area of western Tibet has been reported.The geochemical characteristics of these rocks distinguish themselves from other potassic-ultrapotassic volcanic rocks in Tibet,such as positive Nb,Ta,and Ti anomalies and strong enrichment in large ion lithophile elements(LILE),suggesting that phlogopite,rutile and/or sphene might have originated from the mantle source.These basalts are also characterized by a very wide range of ~(87)Sr/~(86)Sr ratios(0.709 043–0.711 915)and relatively high ~(143)Nd/~(144)Nd ratios(0.512 426–0.512 470,ε_(Nd)=-4.60 to-3.87).We propose a petrogenetic model for the Saga potassic rocks in which the lithospheric mantle source was infiltrated by a volatilerich(H_2O,CO_2)and low-degree silicate melt derived from the asthenosphere in the Middle to Late Proterozoic.After the initial Indo-Asian collision,Neo-Tethyan slab breakoff resulted in the partial melting of the previously metasomatized lithospheric mantle and the formation of the Saga potassic rocks.It is likely that the eruption of these volcanic rocks lasted at least 10 Ma.
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