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Petrogenesis of the mineralized granitoids from the Kounrad and Borly porphyry Cu deposits and the East Kounrad porphyry Mo deposit in Kazakhstan: Implication for tectonic evolution and mineralization of the western part of the Central Asian Orogenic Belt

文献类型：期刊论文

作者Shen, Ping1; Pan, Hongdi2; Seitmuratova, Eleonora3
刊名LITHOS
出版日期2017-08-01
卷号286页码:53-74
关键词Zircon U-Pb age Sr-Nd isotopes Zircon Hf-O isotopes Paleozoic arc
ISSN号0024-4937
DOI10.1016/j.lithos.2017.06.006
文献子类Article
英文摘要The Kounrad region, located in the western part of the Central Asian Orogenic Belt, hosts the Kounrad porphyry Cu, the Borly porphyry Cu-Mo, and the East Kounrad porphyry Mo deposits. Secondary ion mass spectrometry (SIMS) zircon U-Pb dating indicates that the mineralized granitoids from the Kounrad, the Body and the East Kounrad deposits emplaced at 331.7 +/- 2.2 Ma, 311.6 +/- 2.6 Ma, and 295.4 +/- 2.9 Ma, respectively. The mineralized granodiorite porphyries at Kounrad show a geochemical affinity to adakitic rocks with high Sr (357-670 ppm), Sr/Y (40-68) and Mg numbers (Mg# = molar Mg/(Mg + Fe2+)) from 0.43 to 0.51, low Yb (0.97-1.1 ppm) and Y (8.3-11.1 ppm). They have variable Sr-Nd-Hf-O isotopic compositions ( (Sr-87/Sr-88)(i) = 0.7046 to 0.7051, epsilon Nd(t) = -0.1 to +1.1, epsilon Hf(t) = +5.2 to +9.0, delta O-18 = +5.7 to +6.8). These features indicate that the Kounrad adakitic magmas derived from the MASH (melting, assimilation, storage, homogenization) zone at depth of similar to 40 km with 5-15% ancient basement rocks contamination. The mineralized granodiorite porphyries at Body have a normal arc magma geochemical signature (e.g., enrichment of light rare earth elements (LREE) and depletion of heavy REE, Nb and Ti) and experienced fractional crystallization. They also have variable Sr-Nd-Hf-O isotopic compositions ((Sr-87/Sr-88)(i) = 0.7047 to 0.7053, epsilon Nd(t) = 0 to -1.3, epsilon Hf(t) = -0.6 to +7.4, delta O-18 = +5.5 to +6.7) and Mg# (0.45 to 0.51), indicating that they were generated by melting of juvenile basaltic lower crust with normal thickness, followed by 10-30% ancient crustal contamination. The East Kounrad mineralized intrusions, consisting of granite and leucogranite, have experienced advanced degrees of fractional crystallization and have similar Sr-Nd-Hf-O isotopic compositions ( (Sr-87/Sr-88)(i) = 0.7048, epsilon Nd (t) = +1.0 to +2.8, epsilon Hf(t) = +4.8 to +8.9, delta O-18 = +5.6 to +6.4) and low Mg# (0.18-0.37), indicating a juvenile lower crust source at depths of <27 km with 10-20% ancient crustal contamination.
WOS关键词U-PB GEOCHRONOLOGY ; PALEOZOIC CRUSTAL GROWTH ; UNDERPLATED BASALTIC CRUST ; LOWER CONTINENTAL-CRUST ; K CALC-ALKALINE ; HF-O ISOTOPES ; ZIRCON U ; LU-HF ; TRACE-ELEMENT ; ARC MAGMAS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000408286700004
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(U1303293 ; National 305 Project(2011BAB06B01) ; 41272109 ; 41390442) ; National Natural Science Foundation of China(U1303293 ; National 305 Project(2011BAB06B01) ; 41272109 ; 41390442) ; National Natural Science Foundation of China(U1303293 ; National 305 Project(2011BAB06B01) ; 41272109 ; 41390442) ; National Natural Science Foundation of China(U1303293 ; National 305 Project(2011BAB06B01) ; 41272109 ; 41390442)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61890]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Shen, Ping
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Changan Univ, Coll Earth Sci, Xian 710054, Shaanxi, Peoples R China
3.K Satpaev Inst Geol Sci, Lab Geol Format, Alma Ata 050010, Kazakhstan
推荐引用方式
GB/T 7714		 Shen, Ping,Pan, Hongdi,Seitmuratova, Eleonora. Petrogenesis of the mineralized granitoids from the Kounrad and Borly porphyry Cu deposits and the East Kounrad porphyry Mo deposit in Kazakhstan: Implication for tectonic evolution and mineralization of the western part of the Central Asian Orogenic Belt[J]. LITHOS,2017,286:53-74.
APA Shen, Ping,Pan, Hongdi,&Seitmuratova, Eleonora.(2017).Petrogenesis of the mineralized granitoids from the Kounrad and Borly porphyry Cu deposits and the East Kounrad porphyry Mo deposit in Kazakhstan: Implication for tectonic evolution and mineralization of the western part of the Central Asian Orogenic Belt.LITHOS,286,53-74.
MLA Shen, Ping,et al."Petrogenesis of the mineralized granitoids from the Kounrad and Borly porphyry Cu deposits and the East Kounrad porphyry Mo deposit in Kazakhstan: Implication for tectonic evolution and mineralization of the western part of the Central Asian Orogenic Belt".LITHOS 286(2017):53-74.

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来源：地质与地球物理研究所

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