北太行紫荆关基性岩体的成因: 岩石学和地球化学证据

刘玲; 陈斌; 刘安坤

Volume 34 Issue 1

Jan. 2009

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LIU Ling, CHEN Bin, LIU An-kun, 2009. Petrogenesis of the Zijingguan Mafic Pluton, Northern Taihang Orogen: Constraints from Petrology and Geochemistry. Earth Science, 34(1): 165-178.

Citation:

LIU Ling, CHEN Bin, LIU An-kun, 2009. Petrogenesis of the Zijingguan Mafic Pluton, Northern Taihang Orogen: Constraints from Petrology and Geochemistry. Earth Science, 34(1): 165-178.

LIU Ling, CHEN Bin, LIU An-kun, 2009. Petrogenesis of the Zijingguan Mafic Pluton, Northern Taihang Orogen: Constraints from Petrology and Geochemistry. Earth Science, 34(1): 165-178.

Citation:

LIU Ling, CHEN Bin, LIU An-kun, 2009. Petrogenesis of the Zijingguan Mafic Pluton, Northern Taihang Orogen: Constraints from Petrology and Geochemistry. Earth Science, 34(1): 165-178.

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Petrogenesis of the Zijingguan Mafic Pluton, Northern Taihang Orogen: Constraints from Petrology and Geochemistry

Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received Date: 2008-11-09
Publish Date: 2009-01-25

Abstract

Abstract

Through the petrological and geochemical study carried out for the Zijingguan mafic pluton (North Taihang), this paper is to understand their magma sources and petrogenesis.The Zijingguan mafic rocks are mainly made up of olivine-bearing pyroxenites, hornblende gabbros and diorites.Cumulate textures can be seen in the olivine-bearing pyroxenites, suggesting a cumulus origin of them.Hornblende gabbros and diorites are probably crystallized products from the residual melts after the accumulation process.Plagioclases from diorites show complicated textures and compositional zoning, with relatively sodium-rich core mantled by calcium-rich plagioclase, the latter evolved to sodium-rich plagioclase towards the rim with descent of magma temperature.Similarly, clinopyroxenes from diorite show complicated compositional zoning, with the MgO abundances in the rim being slightly higher than that of immediate inner part of pyroxenes.These textures suggest that the magma chamber had experienced a process of magma recharge from the mantle source.The different rock types of the Zijingguan mafic pluton share many common geochemical features like highly fractionated REE patterns ((La/Yb)_N=5.76-23.13) and high Sr/Y ratios (50.95-146.13), highly enriched LILE (K, Sr, Ba) and LREE, and depleted HFSE (Nb, Zr, Ti) and HREE, with minor Eu anomalies in the REE patterns.They show enriched Sr-Nd isotopic compositions, with I_Sr=0.7058-0.7066, ε_Nd(^t) =-13.8 to-18.2.These geochemical features suggest that the mafic pluton originated from partial melting of an EM1 type mantle source.Olivine-bearing pyroxenites have isotopic composition identical to that of hornblende gabbros (mostly ε_Nd(^t) =-15 to-16.6), while the later-crystallizing diorites have a slightly higher ε_Nd(^t) =-13.8 to-14.6, which is in agreement with the model of magma recharge during magma evolution.
- mafic pluton,
- compositional zoning of plagioclase,
- Sr-Nd isotopes,
- magma recharge,
- Taihang Mountains

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References(35)

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Petrogenesis of the Zijingguan Mafic Pluton, Northern Taihang Orogen: Constraints from Petrology and Geochemistry

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