Geochemical characteristics and petrogenesis of Devonian magmatic rocks in the Kalatag district, eastern Tianshan, NW China

被引：0
作者：
Chen L. [1 ,2 ,3 ]
Wang J. [1 ,2 ,3 ]
Deng X. [3 ]
Wu X. [1 ,2 ]
Zou H. [1 ,2 ]
Sun Y. [3 ]
Xu J. [3 ,4 ,5 ]
Zhang W. [1 ,2 ,3 ]
机构：
[1] School of Geosciences and Info-Physics, Central South University, Changsha
[2] Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha
[3] Beijing Institute of Geology for Mineral Resources, Beijing
[4] School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing
[5] Chengdu Geological Research Institute, Sichuan Metallurgical and Geological Exploration Bureau, Chengdu
来源：
Wang, Jingbin (wjb@bigm.com.cn) | 2018年 / Science Frontiers editorial department卷 / 25期
关键词：
Devonian; Eastern Tianshan; Geochemistry; Kalatag district; Petrogenesis;
D O I：
10.13745/j.esf.sf.2018.4.14
中图分类号：
学科分类号：
摘要：
We conducted petrologic investigation and performed major and trace elemental and Sr-Nd isotopic analysis on magmatic rocks from the Kalatag district, eastern Tianshan in order to understand the petrogenesis and geodynamic setting of Devonian magmatic rocks. The results show that Devonian magmatic rocks were mainly composed of intermediate-basic rocks including gabbro, diorite, quartz diorite, monzonite and andesite. Gabbro was calc-alkaline to tholeiitic with high Al2O3 content (18.96%-19.06%) and Mg# value (57.28-69.37), yielding A/CNK value of 0.73-0.88. Diorite, quartz diorite, monzonite and andesite were calc-alkaline to high-K calc-alkaline with high Al2O3 contents (15.02%-17.43%) and Mg# values (53.67-72.91), and A/CNK values of 0.73-1.17. Sr-Nd isotopic analysis yielded positive εNd(t) values ranging from 5.36 to 7.72 with low initial 87Sr/86Sr ratios of 0.70311 to 0.70518. Devonian magmatic rocks were enriched in large ion lithophile elements (Rb, Ba and K) while depleted in high field strength elements (Ta, Nb and Ti). These geochemical characteristics indicate that Devonian magmatic rocks were derived from the same magma chamber with an enriched mantle wedge metasomatized by subduction slab fluid and emplaced in an island arc setting during the northward subduction of the Kanggur Ocean. © 2018, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：51 / 68
页数：17
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  • [1] Sengor A.M.C., Natalin B.A., Burtman V.S., Evolution of the Altaid tectonic collage and Paleozoic crustal growth in Eurasia, Nature, 364, 6435, pp. 299-307, (1993)
  • [2] Chen Y.J., Pirajno F., Wu G., Et al., Epithermal deposits in north Xinjiang, NW China, International Journal of Earth Sciences, 101, 4, pp. 889-917, (2012)
  • [3] Xiao W.J., Zhang L.C., Qin K.Z., Et al., Paleozoic accretionary and collisional tectonics of the eastern Tianshan (China): implications for the continental growth of Central Asia, American Journal of Science, 304, 4, pp. 370-395, (2004)
  • [4] Windley B.F., Alexeiev D., Xiao W.J., Et al., Tectonic models for accretion of the Central Asian Orogenic Belt, Journal of the Geological Society, 164, 12, pp. 31-47, (2007)
  • [5] Xiao W.J., Santosh M., The western Central Asian Orogenic Belt: a window to accretionary orogenesis and continental growth, Gondwana Research, 25, 4, pp. 1429-1444, (2014)
  • [6] Guo Q.Q., Chung S.L., Xiao W.J., Et al., Petrogenesis and tectonic implications of Late Devonian arc volcanic rocks in southern Beishan orogen, NW China: geochemical and Nd-Sr-Hf isotopic constraints, Lithos, 278-281, pp. 84-96, (2017)
  • [7] Pirajno F., Seltmann R., A review of mineral systems and associated tectonic settings of northern Xinjiang, NW China, Geoscience Frontiers, 2, 2, pp. 157-185, (2011)
  • [8] Zhang F.F., Wang Y.H., Liu J.J., Fluid inclusions and H-O-S-Pb isotope systematics of the Baishan giant porphyry Mo deposit in Eastern Tianshan, China, Ore Geology Reviews, 78, pp. 409-423, (2016)
  • [9] Shen P., Pan H.D., Dong L.H., Yandong porphyry Cu deposit, Xinjiang, China: geology, geochemistry and SIMS U-Pb zircon geochronology of host porphyries and associated alteration and mineralization, Journal of Asian Earth Sciences, 80, 2, pp. 197-217, (2014)
  • [10] Wang Y.H., Zhang F.F., Liu J.J., The genesis of the ores and intrusions at the Yuhai Cu-Mo deposit in eastern Tianshan, NW China: constraints from geology, geochronology, geochemistry and Hf isotope systematics, Ore Geology Reviews, 77, pp. 312-331, (2016)
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