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REE and other trace element chemistry of oldhamite (CaS) in the Qingzhen chondrite (EH3) and their genetic implications

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Abstract

Instrumental neutron activation analysis (INAA) of 14 single oldhamite grains separated from the Qingzhen chondrite (EH3) for refractory (La, Ce. Sm, Eu, Yb, Lu, Ca, Sc, Hf, and Th), volatile (Na, Cr, Zn, Se, Br, etc.) and siderophiie elements (Fe, Ni, Co, Ir, Au, and As) revealed that oldhamite is highly rich in refractory elements. The mineral serves as the principal carrier of REE and contains about 80% of the REEs in the Qingzhen enstatite chondrite. Furthermore, the large enrichment of LREE relative to HREE is noticed in oldhamite from the Qingzhen. In general, the oldhamite from metal-sulfide assemblages is richer in REE than that from the matrix, i-e., the earlier the oldhamite grains condensed, the richer they are in REE. Meanwhile, oldhamite is also rich in volatile elements such as Se, Br, etc. In terms of the distribution of trace elements in oldhamite from the Qingzhen, the chondrite is suggested to have resutled from high-temperature condensation of solar nebula.

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Authors and Affiliations

  1. Institute of Geochemistry (Guangzhou Branch), Academia Sinica, 510640, Guangzhou

    Chen Yongheng & Wang Daode

  2. Max-Planck-Institut fur Kernphysik, 6900, Heidelberg, Germany

    Ernst Pernicka

Authors
  1. Chen Yongheng
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  2. Wang Daode
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  3. Ernst Pernicka
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This project was financially supported by the National Natural Science Foundation of China.

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Yongheng, C., Daode, W. & Pernicka, E. REE and other trace element chemistry of oldhamite (CaS) in the Qingzhen chondrite (EH3) and their genetic implications. Chin. J. of Geochem. 12, 317–327 (1993). https://doi.org/10.1007/BF02842017

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  • DOI: https://doi.org/10.1007/BF02842017

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