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	Mineralization age and petrogenesis of associated intrusions in the Mingze-Chengba porphyry-skarn Mo-Cu deposit, Gangdese
	Sun Xiang; Zheng YouYe; Wu Song; You ZhiMin; Wu Xu; Li Miao; Zhou TianCheng; Dong Jun
通讯作者	Sun, X (通讯作者)
发表日期	2013
ISSN	1000-0569
EISSN	2095-8927
起始页码	1392
结束页码	1406
卷号	29 期号:4
英文摘要	The Kelu-Chongmuda metallogenic belt, different from the Gangdese Miocene porphyry-skarn Cu-Mo-Au belt, is characterized by Oligecene porphyry-skarn Mo-W-Cu mineralization. The types and petrogenesis of intrusions associated with Oligecene mineralization and the reason for the difference between the Kelu-Chongmuda and Gangdese mineralization remain topics of debate, which prevents the evaluation of resource potentiality. Therefore, we conducted the geochronological analysis and research on the petrogenesis of associated intrusions for the Chengba porphyry Mo deposit and Mingze skarn Cu deposit. The Mingze monzonlite associated with skarn mineralization has zircon SHRIMIP U-Pb age of 30.4 +/- 0. 6Ma, indicating that the Mingze mineralization took place at ca. 30Ma, which is consistent with the mineralization age of the Chengba porphyry Mo deposit. The Mingze monzonlite are shoshonitie, with low SiO2 (55% similar to 57%), high K2O(2.7% similar to 5. 0%), MgO (3.5% similar to 6. 9%), Mg-# value (57. 6 similar to 67. 2), high abundances of compatible elements (e. g., Cr = 34 x 10(-6) similar to 379 x 10(-6); Ni = 48 x 10(-6) similar to 116 x 10(-6)), and low Sr/Y ratios (24 similar to 49). The Chengba granodiorite, with the zircon SHRIMIP U-Pb age of 28. 7 +/- 0. 9Ma, are high-K calc-alkaline, with high SiO2 (65% similar to 67%), high K2O (3.2% similar to 4. 1%), MgO (1.7% similar to 2. 1%), Mg-# value (49.5 similar to 51. 1), low abundances of compatible elements (e. g., Cr = 20 x 10(-6) similar to 39 x 10(-6); Ni = 16 x 10(-6) similar to 25 x 10(-6)), and low Sr/Y ratios (53 similar to 76). Both the monzonlite and granodiorite display enriched LREE and LILE, depleted HSFE, marked negative Nb-Ta-Ti anomalies, and slightly negative Eu anomalies. However, the monzonlite have high abundances of REE than the granodiorite. They also have similar Hf isotopic compositions with epsilon(Hf)(t) = +2. 8 similar to +6. 8 for the monzonlite and epsilon(Hf)(t) = +4. 2 similar to +6. 1 for the granodimite. Our new data, together with previously published work, lead us to suggest that the parental magmas of the Mingze monzonlite were most likely derived from enriched lithospheric mantle beneath southern Tibet and the Chengba granodimites were derived from partial melting of a thickened juvenile lower crust. The magma mixing between the crust-derived and mantle-derived magmas is beneficial for the porphyry-skarn Cu-Mo mineralization in the Kelu-Chongmuda and Gangdese metallogenic belts. But due to the more intensive erosion in the Kelu-Chongmuda than in the Gangdese, the upper Cu bodies were not preserved and the lower Mo bodies were present in the Chengba porphyry Mo deposit.
关键词	TIBETAN PLATEAU IMPLICATIONS CONTINENTAL COLLISION ZONES ADAKITE-LIKE ROCKS SUPERIMPOSED OROGENESIS LITHOSPHERIC MANTLE MOLYBDENUM DEPOSIT SUBDUCTED SLAB LU-HF CRUST PB
英文关键词	Porphyry and Skarn deposit; Kelu-Chongmuda metallogenic belt; Magma mixing; Petrogenesis; Oligecene; Gangdese
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000318260300023
来源期刊	ACTA PETROLOGICA SINICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258119
推荐引用方式 GB/T 7714	Sun Xiang,Zheng YouYe,Wu Song,et al. Mineralization age and petrogenesis of associated intrusions in the Mingze-Chengba porphyry-skarn Mo-Cu deposit, Gangdese[J]. 中国科学院青藏高原研究所,2013,29(4).
APA	Sun Xiang.,Zheng YouYe.,Wu Song.,You ZhiMin.,Wu Xu.,...&Dong Jun.(2013).Mineralization age and petrogenesis of associated intrusions in the Mingze-Chengba porphyry-skarn Mo-Cu deposit, Gangdese.ACTA PETROLOGICA SINICA,29(4).
MLA	Sun Xiang,et al."Mineralization age and petrogenesis of associated intrusions in the Mingze-Chengba porphyry-skarn Mo-Cu deposit, Gangdese".ACTA PETROLOGICA SINICA 29.4(2013).