Geochronology, geochemistry and significance of the metabasic volcanic rocks in Tuomoerrite area, North Qaidam
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P588.41;P597

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    Abstract:

    Tuomoerrite ophiolitic mélange is located in the eastern segment of the northern margin of Qaidam terrane. This paper presents a systematic geochronological and petrogeochemical study of the meta-basaltic rocks in the ophiolite mélange. The metabasalts have whole-rock SiO2 contents of 47.78%~50.01%,MgO contents of 4.52%~9.36%, TFeO contents of 8.00%~14.94%,K2O contents of 0.04%~0.80%,and Na2O contents of 1.02%~4.20%, resembling those features of tholeiitic magma. They show slightly depletion in LREE, enrichment in LILE and LREE,and depletion in HFSE,similar to the patterns of arc-related volcanic rocks. These features collectively suggest a back-arc setting for the meta-basalts. The zircon U-Pb age of these metabasalts determined by LA-ICP-MS is 480.1±1.8 Ma,suggesting that the expansion time of the back-arc basin in this area should be around 480 Ma,and the oceanic slab subduction occurred in Early Ordovician.

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王振强,张照伟,丁培超,冯建之,薛志强,吕达鑫,2022,柴北缘托莫尔日特地区变基性火山岩年代学、地球化学特征及地质意义[J].岩石矿物学杂志,41(3):491~503. WANG Zhen-qiang, ZHANG Zhao-wei, DING Pei-chao, FENG Jian-zhi, XUE Zhi-qiang, Lü Da-xin,2022,Geochronology, geochemistry and significance of the metabasic volcanic rocks in Tuomoerrite area, North Qaidam[J]. Acta Petrologica et Mineralogica,41(3):491~503.

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History
  • Received:December 13,2020
  • Revised:December 31,2021
  • Adopted:
  • Online: May 17,2022
  • Published: