滇西金沙江-红河构造带鲁甸始新世煌斑岩成因及动力学背景

贺娟; 王启宇; 闫国川

doi:10.3799/dqkx.2018.105

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2586-2599

He Juan, Wang Qiyu, Yan Guochuan, 2018. Genesis and Geodynamic Settings of the Eocene Lamprophyres from Jinshajiang-Red River Tectonic Belt, Ludian, Western Yunnan Province. Earth Science, 43(8): 2586-2599. doi: 10.3799/dqkx.2018.105

Citation:

He Juan, Wang Qiyu, Yan Guochuan, 2018. Genesis and Geodynamic Settings of the Eocene Lamprophyres from Jinshajiang-Red River Tectonic Belt, Ludian, Western Yunnan Province. Earth Science, 43(8): 2586-2599. doi: 10.3799/dqkx.2018.105

Citation:

He Juan, Wang Qiyu, Yan Guochuan, 2018. Genesis and Geodynamic Settings of the Eocene Lamprophyres from Jinshajiang-Red River Tectonic Belt, Ludian, Western Yunnan Province. Earth Science, 43(8): 2586-2599. doi: 10.3799/dqkx.2018.105

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Genesis and Geodynamic Settings of the Eocene Lamprophyres from Jinshajiang-Red River Tectonic Belt, Ludian, Western Yunnan Province

doi: 10.3799/dqkx.2018.105

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2018-05-30
Publish Date: 2018-08-15

Abstract

Abstract

Researches on the lamprophyres from the Jinshajiang-Red River tectonic belt are mainly concentrated in the southern Ailaoshan area.The zircon U-Pb geochronology and the whole rock geochemistry of the newly discovered Ludian lamprophyres located in the middle segment of the belt are applied in this paper.Zircon U-Pb dating proves Eocene emplacement age of Ludian lamprophyres, which is consistent with the peak age of the Cenozoic magmatism in the Jingshajiang-Red River alkali-rich intrusion belt.Geochemical data indicate that Ludian lamprophyres have the characteristics of high K₂O, high (K₂O + Na₂O) and Mg^#, low TiO₂, being enriched in LILE and LREE, depleted in HFSE (especially Ta-Nb-Ti).The source of the Ludian lamprophyres should be the lithosphere mantle which had been enriched by subduction-related fluids and melts, and the source should be phlogopite bearing spinel harzburgite.Combined with the study of coeval mafic lava and felsic intrusion, we put forward that the mantle in western Yunnan might have been enriched by the Protozoic subduction related to the assembly of the Rodinia supercontinent.In the Eocene, following the collision between Indian and Asia, the continental lithosphere in the Jingshajiang-Red River tectonic belt underwent convective thinning or delamination, which induced rising of the asthenosphere, and then partial melting of the enriched lithosphere mantle which generated the lamprophyre melt.
- lamprophyres,
- Jingshajiang-Red River tectonic belt,
- enriched mantle,
- petrogenesis,
- Ludian,
- western Yunnan,
- geochronology,
- geochemistry

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References(56)

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