闽西南E-MORB型基性岩墙成因：来自地球化学、锆石U-Pb年代学及Sr-Nd同位素证据

张贵山; 彭仁; 温汉捷; 赵志琦; 张磊; 邱红信; 孟乾坤

doi:10.3799/dqkx.2021.062

Volume 46 Issue 12

Dec. 2021

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Article Navigation > Earth Science > 2021 > 46(12): 4230-4246

Zhang Guishan, Peng Ren, Wen Hanjie, Zhao Zhiqi, Zhang Lei, Qiu Hongxin, Meng Qiankun, 2021. Genesis of E-MORB-Like Mafic Dykes in Southwestern Fujian Province, SE China: Evidence from Geochemistry, Zircon U-Pb Geochronology and Sr-Nd Isotope. Earth Science, 46(12): 4230-4246. doi: 10.3799/dqkx.2021.062

Citation:

Zhang Guishan, Peng Ren, Wen Hanjie, Zhao Zhiqi, Zhang Lei, Qiu Hongxin, Meng Qiankun, 2021. Genesis of E-MORB-Like Mafic Dykes in Southwestern Fujian Province, SE China: Evidence from Geochemistry, Zircon U-Pb Geochronology and Sr-Nd Isotope. Earth Science, 46(12): 4230-4246. doi: 10.3799/dqkx.2021.062

Citation:

Zhang Guishan, Peng Ren, Wen Hanjie, Zhao Zhiqi, Zhang Lei, Qiu Hongxin, Meng Qiankun, 2021. Genesis of E-MORB-Like Mafic Dykes in Southwestern Fujian Province, SE China: Evidence from Geochemistry, Zircon U-Pb Geochronology and Sr-Nd Isotope. Earth Science, 46(12): 4230-4246. doi: 10.3799/dqkx.2021.062

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Genesis of E-MORB-Like Mafic Dykes in Southwestern Fujian Province, SE China: Evidence from Geochemistry, Zircon U-Pb Geochronology and Sr-Nd Isotope

doi: 10.3799/dqkx.2021.062

Zhang Guishan^{1, 2
,
,},
Peng Ren¹,
Wen Hanjie^{1, 3
,
,
,},
Zhao Zhiqi¹,
Zhang Lei¹,
Qiu Hongxin¹,
Meng Qiankun¹

1.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an 710054, China
3.
State Key Laboratory of Ore Desposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China

Received Date: 2021-02-11
Publish Date: 2021-12-15

Abstract

Abstract

E-MORB-like mafic dykes are exposed in Southwest Fujian Province and record key information of tectonic-magmatism in Southeast China during Late Cenozoic. A comprehensive research of petrology, zircon U-Pb dating, elemental geochemistry and isotope geochemistry was carried out. Mafic dykes are composed of dolerite and hornblende gabbro dolerite, and possess middle-low potassic features, with the Mg^# values range from 55.80 to 66.38. Zircon U-Pb dating yield an age of 117.4±3.8 Ma, indicating that mafic dykes were emplaced at end of Early Cretaceous. Dykes enrich in Rb, Ba, U, K and LREE, without obvious depletion of Nb, Ta and Ti, which is consist with the E-MORB geochemical affinities. Samples have positive ε_Nd(t) (-0.9 to 4.0), and (⁸⁷Sr/⁸⁶Sr)_i values range from 0.706 50 to 0.710 19. Geochemical compositions show that the olivine and clinopyroxene fractionation have occurred and crustal contamination did not played an important role during the emplacement. We propose a slab window model to interpret the formation of mafic dykes. Subduction speed of Pacific plate beneath Nanling area was decreased by the overlying thickened lithosphere, which lead to the subduction velocity of the plate to be different from that of the adjacent area, and resulted in the formation of slab windows. Asthenospheric material could rise through slab windows, and carried and interacted with oceanic sediments, forming the E-MORB-like mantle rocks. With the upwelling of asthenosphere, E-MORB-like mantle materials will undergo partially melt and the resulting melts will emplace to form mafic dykes with a continental extensional-intracontinental rift setting at end of Early Cretaceous.
- mafic dyke,
- E-MORB,
- zircon U-Pb geochronology,
- geochemistry,
- Southwest Fujian

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References(96)

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