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2012, 31(2) 297-305 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Petrological characteristics and petrogenesis of Alatan Gol ore-bearing gabbro in West Ujimqin Banner��Inner Mongolia |
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GONG Peng-Hui-1, XI Ai-Hua-1, GE Yu-Hui-2, LI Bao-Lin-3, LIU Jin-Yu-3, LIU Jun-Mei-3, WANG Shou-Ren-3 |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. College of Resources and Environment��Southwest Petroleum University��Chengdu 610500��China; 3. Jilin Horroc Nonferrous Metal Groups Co�� Ltd��Panshi��Jilin 132311��China |
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Abstract��
The Alatan Gol vanadium titanomagnetite ore-bearing gabbro plutons are mainly composed of medium- coarse grained gabbro in narrow sense��amphibole gabbro��and olivine gabrro��fine-grained gabbro and diabase in West Ujimqin Banner��Inner Monglia�� The study on major��trace and REE elements of various drilling cores shows the content of Al2O3 as 14. 5% �� 19. 65%��K2O + Na2O as 3. 03% �� 4. 7%��and P2O5 as 0. 11% �� 1. 04%�� The major elements are characterized by high-Al��low-alkali and uniform phosphorus-rich��belonging to calc-alkaline series with Rittman index less than 4�� The content of ( La /Yb) N is 1. 40 �� 6. 54��and ( Gd /Yb) N as 1. 38 �� 2. 09��which shows LREE enrichment and right slope��indicating the magma derived from the mild partial melting of mantle�� The δEu of gabbro is 0. 53 �� 1. 18 in content��and the different expression forms of Eu anomaly and similar distribution characteristics of trace elements��reveal that the various rock types deprived from the homogenous source on the one hand��and provide geochemistry basis for genetic mechanism of fractional crystallization�� multi-phase pulse emplacement and fluid superimposed mineralization on the other hand combining with the petrography study�� |
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Keywords��
gabrro
geochemistry characteristics
West Alatan Gol
Ujimqin Banner
Inner Mongolia
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