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The characteristics and implication of the zonation in clinopyroxene phenocrysts from the Yaojiazhuang ultramafic-syenitic complex, northwestern Hebei Province
Liu Xin1,2; Tang YanJie1
2018
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume34Issue:11Pages:3315-3326
AbstractUltramafic-syenitic complex in the Yaojiazhuang, northwestern Hebei Province, contains abundant clinopyroxene phenocrysts with compositional zonations, which can be divided into two kind of patterns : simple zoning and complex zoning. All the simple zonings are in normal pattern. The cores of the grains show high contents of the Al2O3, FeO, Na2O and low contents of MgO and Cr2O3, while the rims of zonation are opposite to the cores. Two different kind of simple zonations are recognized. The chemical composition of some clinopyroxene phenocrysts changed gradually from the core to the rim of grains, which could be crystallized from the host magma of varying compositions caused by the assimilation of crustal materials or crystal fractionation. Whereas, other phenocrysts show compositional variation in an abrupt change from core to rim of grains with corrosion texture, possibly caused by the modification of early-crystallized clinopyroxenes by later magmas. The clinopyroxene phenocrysts with complex zoning have core-mantlerim texture. The core of zonation is relatively low in Me-#, but high in FeO content, while the mantle of zonation is clearly high in Mg-# and low in FeO content. The rim of zonation is lower in Mg-# values than the core. These observations indicate the mixing of different magmas. The core of zonation could crystallize from the host magma derived from metasomatized lithospheric mantle. The high-Mg-# mantle of zonation indicates the contribution of the asthenospheric melt, and the low-Mg-# rim of clinopyroxene phenocrysts could be resulted from the addition of crustal materials. In conclusion, the zonations of clinopyroxene phenocrysts suggest that the Yaojiazhuang complex could be formed by multiple stage magmatic intrusion. The later magmas continuously intruded and reacted with the former host magma. As a result, abundant clinopyroxene phenocrysts with compositional zonations formed, and the pyroxenite, pyroxenite-syenite, and syenite occurred in sequence. Combined with the previous studies, the parent magma of Yaojiazhuang complex could originate from the enriched lithospheric mantle, with minor contributions of asthenosphere and crustal materials.
KeywordNorthwestern Hebei Province Late Triassic Compositional zonation Clinopyroxene Magma mixing
WOS KeywordCRUST-MANTLE INTERACTION ; NORTH CHINA CRATON ; PETROGENESIS ; ROCKS ; XENOCRYSTS ; EVOLUTION ; YINSHAN ; BASALTS ; BENEATH ; AREA
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000456929100015
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90213
Collection岩石圈演化国家重点实验室
Corresponding AuthorTang YanJie
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liu Xin,Tang YanJie. The characteristics and implication of the zonation in clinopyroxene phenocrysts from the Yaojiazhuang ultramafic-syenitic complex, northwestern Hebei Province[J]. ACTA PETROLOGICA SINICA,2018,34(11):3315-3326.
APA Liu Xin,&Tang YanJie.(2018).The characteristics and implication of the zonation in clinopyroxene phenocrysts from the Yaojiazhuang ultramafic-syenitic complex, northwestern Hebei Province.ACTA PETROLOGICA SINICA,34(11),3315-3326.
MLA Liu Xin,et al."The characteristics and implication of the zonation in clinopyroxene phenocrysts from the Yaojiazhuang ultramafic-syenitic complex, northwestern Hebei Province".ACTA PETROLOGICA SINICA 34.11(2018):3315-3326.
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