NDLI: Dunite xenoliths and olivine xenocrysts in gabbro from Taihang Mountains: Characteristics of Mesozoic lithospheric mantle in Central China

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Dunite xenoliths and olivine xenocrysts in gabbro from Taihang Mountains: Characteristics of Mesozoic lithospheric mantle in Central China

Content Provider	Springer Nature Link
Author	Xu, Wenliang Wang, Chunguang Yang, Debin Wang, Feng Pei, Fuping
Copyright Year	2010
Abstract	This article reports the petrography and mineral chemistry of dunite xenoliths and olivine xenocrysts entrained by the Early Cretaceous Xi’anli (西安里) hornblende (Hb)-gabbros from the southern Taihang (太行) Mountains, with the aim of constraining the nature of the Mesozoic lithospheric mantle in Central China. Rounded dunite xenoliths are 1–3 cm$^{3}$ in size and display porphyroclastic, tabular, and protogranular textures. Chromite with Cr$^{#}$=60–89 is common in the xenoliths. Olivine xenocrysts of 4–6 mm in size are also found in the Hb-gabbros. Orthopyroxene reaction rims are commonly observed around olivine xenocrysts or between dunite xenoliths and host rocks. The porphyroclastic olivines within dunite xenoliths and olivine xenocrysts have kink bands and Mg$^{#}$=83–94. The Mg$^{#}$ of olivine cores and rims are 89–94 (average, 90) and 83–86 (average, 84.4), respectively. The CaO contents of all olivines from the xenoliths and xenocrysts are less than 0.1 wt.%, suggesting a lithospheric mantle origin. The Ca content (214 ppm–818 ppm) and Ti content (15 ppm–137 ppm) in the xenoliths and xenocrysts are similar to those of olivines from the dunite xenoliths, but are much higher than those of olivines from harzburgite and lherzolite xenoliths in the Fushan (符山) intrusion. This finding implies that the xenoliths and xenocrysts may have originated from harzburgites or lherzolites that were intensively modified by silica-rich melts. This result, combined with high Mg$^{#}$ (92–94) of olivine cores from the dunite xenoliths and xenocrysts, indicates that these olivine xenocrysts and dunite xenoliths could represent the residue of ancient (Archean or Paleoproterozoic) lithospheric mantle and might have experienced the same intensive modification by silica-rich melts as the host magma, resulting in enrichment in MgO and SiO$_{2}$.
Starting Page	692
Ending Page	710
Page Count	19
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	21
Issue Number	5
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2010-11-07
Publisher Place	China University of Geosciences
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	North China craton Xi’anli Hb-gabbro dunite xenocryst lithospheric mantle Geology Geochemistry Computer Applications in Earth Sciences Biogeosciences Applied Earth Sciences Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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Mantle olivine xenocrysts entrained in Mesozoic basalts from the North China craton: Implication for replacement process of lithospheric mantle

Repeated modification of lithospheric mantle in the eastern North China Craton: Constraints from SHRIMP zircon U-Pb dating of dunite xenoliths in western Shandong

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Petrogenesis of the Early Cretaceous Hongshan Complex in the Southern Taihang Mountains: Constraints from Element Geochemistry, Zircon U-Pb Geochronology and Hf Isotopes

Geothermal evidence of the mesozoic and cenozoic lithospheric thinning in the liaohe depression

Melt/rock interaction in remains of refertilized Archean lithospheric mantle in Jiaodong Peninsula, North China Craton: Li isotopic evidence

Dunite xenoliths and olivine xenocrysts in gabbro from Taihang Mountains: Characteristics of Mesozoic lithospheric mantle in Central China

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