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Lithogeochemical Characteristics of Basic-Ultrabasic Intrusion , Xiaosongshan , Helanshan(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2008年第04期
Page:
351-356
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Lithogeochemical Characteristics of Basic-Ultrabasic Intrusion , Xiaosongshan , Helanshan
Author(s):
HUANG Xi-feng1QIAN Zhuang-zhi1WU Wen-kui1SUN Bao-ping1 LU Dong-xia1WANG Cheng2LU Yan-jun2
1.School o f Earth Sciences and Resources, Chang' an University, Xi' an 710054, Shaanxi, China; 2.Ningxia Institute o f Geological Survery, Yinchuan 750021, Ningxia, China)
Keywords:
lithogeochemical geotectonic environment assimilation and contamination fractional crystallization Xiaosongshan basic-ultrabasic complex
PACS:
P588.12
DOI:
-
Abstract:
The Xiaosongshan basic-ultrabasic complex is consists of three closely associated rocks(peridotite, gabbro and pyroxenite). The Mg# of the basic rocks is 0. 71 to 0. 76, which is similar to Mg# of the original magma. The Mg# of the ultrabasic rocks is 0. 80~ 0. 89, demostrates the characteristics of early cumulation of magma.The total? REE is 13. 03× 10- 6 to 82. 66× 10- 6, theδ(Eu)is 1. 08 to 1. 61 which shows a weak positive Eu anomaly, the(La/ Yb)Nis 2. 49 to 5. 24,and the(Ce/ Yb)Nis 3. 01 to 4. 97. The normalized REE patterns of the Xiaosongshan complex are relatively enriched in LREE and belong to the right-inclined type. The trace element patterns show enrichment in LILE. These lithogeochemical data suggest that the Xiaosongshan complex was formed in intra-plate extension environment. The forming processes of the Xiaosongshan complex may include fractional crystallization in the early and contamination in the late. Therefore, the Xiaosongshan complex has potential advantages in searching magmatic deposit of Cr-Cu-Ni type.

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Last Update: 2008-12-20