太行山和华北其它地区中生代岩浆作用的锆石U-Pb年代学和地球化学特征及其岩浆成因和地球动力学意义

陈斌 田伟 翟明国 荒川洋二

太行山和华北其它地区中生代岩浆作用的锆石U-Pb年代学和地球化学特征及其岩浆成因和地球动力学意义

陈斌田伟翟明国荒川洋二

- [1]造山带与地壳演化教育部重点实验室；北京大学地球与空间科学学院，北京100871 [2]中国科学院地质与地球物理研究所，北京100029 [3]筑波大学地球科学系，筑波市305-8572，日本
基金项目:
本文得到国家自然科学基金会(项目号40372033)中国科学院创新知识工程重大项目(项目号KZCX1-07)教育部新世纪优秀人才支持计划的资助．

修回日期: 2004-12-08

刊出日期: 2005-01-31

Zircon U-Pb geochronology and geochemistry of the Mesozoic magmatism in the Taihang Mountains and other places of the North China craton, with implications for petrogenesis and geodynamic setting

Bin CHEN,Wei TIAN,MingGuo ZHAl and Yoji ARAKAWA Key Laboratory of Orogenic Belts and Crustal Erolution,MOE,School of Earth and Space Sciences,Peking University,Beijing 100871,China Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029,China Institute of Geosciences,Tsukuba University,Tsukuba 305-8572,Japan

Revised Date: 08 December 2004

Publish Date: 31 January 2005

摘要

摘要: 华北克拉通东部中生代岩浆岩的主要特征是岩石类型复杂(从辉长质到二长花岗质)，显示高钾钙碱性、高Sr—Ba、高Sr／Y和La／Yb比值和高度富集的Sr-Nd同位素成分。锆石SHRIMP定年表明，太行山地区岩浆作用发生在138—127Ma之间。该年代结果与东亚其它地区已经发表的锆石年代数据揭示了中生代岩浆作用的发展具有从日本岛(和朝鲜半岛；210Ma)，到胶辽半岛(180Ma)，再到大别山-太行山(138Ma)的年轻化趋势。这暗示华北中生代岩浆作用可能与古太平洋板块的俯冲有关。但华北中生代岩浆岩似乎没有明显的向内陆方向的成分变化极性，可能与古太平洋板块在地幔过渡带的水平俯冲有关。地球化学数据表明，华北中生代岩浆岩可能主要形成于壳幔岩浆混合作用和随后的分离结晶过程．而不是形成于基性下地壳部分熔融作用。
- 锆石U-Pb年龄 /
- 地球化学 /
- 壳幔岩浆混合作用 /
- 板块俯冲 /
- 华北克拉通
Abstract: The Mesozoic rocks from eastern North China Craton(NCC) range in composition from gabbroic to monzogranitic, showing high-K calc-alkaline to shoshonitic affinity, high Sr-Ba and high Sr/Y, La/Yb, and highly enriched Sr-Nd isotopic compositions. SHRIMP zircon dating for four pinions from the Taihang Mountains, westernmost NCC, yields ages of 138-127 Ma, which, along with published ages for magmatic rocks from other parts of eastern Kast Asia, reveal a northwestward younging trend of calc-alkaline magmatism from Japan island chain (and Korean peninsula; 210 Ma) , through Jiaodong and Liaodong Peninsula ( 180 Ma) , and to the Taihang orogen ( 138 Ma). This suggests the genesis of the Mesozoic rocks in the NCC was linked to the subduction of the paleo-Pacific plate, rather than to the Triassic collision between the Yangtze block and NCC. The lack of a regular variation in compositions from the coastal areas to interiors of eastern China as is shown by the magmatic rocks in the Basin and Range is probably related to the "flat subduction" of the paleo-Pacific slab beneath the NCC. Moreover, they probably originated from mixing between mafic magmas from enriched mantle sources and crust-derived granitic melts, followed by fractionation, rather than from melting of mafic lower crust as previously suggested by many others.
- Zircon U-Pb ages /
- Geochemistry /
- Magma mixing /
- Subduction /
- North China Craton

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太行山和华北其它地区中生代岩浆作用的锆石U-Pb年代学和地球化学特征及其岩浆成因和地球动力学意义

Zircon U-Pb geochronology and geochemistry of the Mesozoic magmatism in the Taihang Mountains and other places of the North China craton, with implications for petrogenesis and geodynamic setting

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