Geological and geochemical characteristics and genesis of magmatic rocks related to porphyry Mo deposits in the Beihuaiyang region

被引：0
|
作者：
Wang B. [1 ]
Zhang H. [1 ]
Wang P. [1 ]
Xu X. [2 ]
Hao Y. [1 ]
机构：
[1] No.313 Team, Anhui Bureau of Geology and Mineral Resources, Liu'an
[2] School of Resources and Environmental Engineering, Hefei University of Technology, Hefei
来源：
Earth Science Frontiers | 2016年 / 23卷 / 04期
关键词：
Beihuaiyang region; Geochemical characteristics; Igneous rocks; Magma source; Porphyry molybdenum deposit;
D O I：
10.13745/j.esf.2016.04.004
中图分类号：
学科分类号：
摘要：
There are numerous porphyry molybdenum deposits located in the eastern Beihuaiyang area of Qinling-Dabie metallogenic belt, where the magmatism is closely related to mineralization. This study has investigated the intrusive rocks in the field which are closely related with porphyry molybdenum deposit, by using the method of whole-rock major elements, trace elements and isotope geochemistry research, and discussed its petrogenesis. This research shows that the scale of metallogenetic rock body is small, and the lithology is porphyry granite, which is controlled by the fault structure in northeast and northwest. The chemical composition of rocks is characterized by high silicon, and potassium alkali-rich, belonged to high-K calc-alkaine-shoshonitic series, metaluminous-peraluminous rocks. Trace and rare earth elements have similar characteristics and show features of crustal sources. Sr-Nd-Pb-Hf isotope geochemical characteristics show that those matallogenic granitic magma has the same sources with Dabie Cretaceous granites. They both originated from Dabie granitic gneiss and TTG-like magmatic rocks of the north Yangtze Block in the Neoproterozoic, and interfused some ancient crustal materials from palaeoproterozoic Yangtze craton(such as Kongling complex). The lower crust delamination, asthenosphere upwelling and large-scale crustal extension happened in the Cretaceous, the northern margin of Yangtze craton crust melted and provided the mainly diagenetic materials. Upwelling of mantle derived magma probably provided heat source with little materials. The igneous rocks associated with Mo Deposits in this region are similar to Eastern Qinling metallogenic belt, which belongs to deep-hypabyssal granitoids. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.
引用
收藏
页码：46 / 62
页数：16
相关论文
共 48 条
  • [11] Li S.G., Hong J.A., Li H.M., Et al., Zircon U-Pb dating of the pyroxenites-pyroxenic plutons and its implications, Geological Journal of China Universities, 5, 3, pp. 351-355, (1999)
  • [12] Wang Q., Wyman D.A., Xu J.F., Et al., Early Cretaceous adakitic granites in the Northern Dabie Complex, central China: Implications for partial melting and delamination of thickened lower crust, Geochimica et Cosmochimica Acta, 71, pp. 2609-2636, (2007)
  • [13] Li H.C., Xu Z.W., Lu X.C., Et al., Constraints on timing and origin of the Dayinjian intrusion and associated molybdenum mineralize-ation, western Dabie orogen, central China, International Geology Reviews, 54, 13, pp. 1579-1596, (2012)
  • [14] Chen W., Xu Z.W., Lu X.C., Et al., Petrogenesis of the Bao'anzhai granite and associated Mo mineralization, western Dabie orogen, east-central China: Constraints from zircon U-Pb and molybdenite Re-Os dating, whole-rock geochemistry, and Sr-Nd-Pb-Hf isotopes, International Geology Review, 55, pp. 1220-1238, (2013)
  • [15] Mao J.W., Xie G.Q., Bierlein F., Et al., Tectonic implications from Re-Os dating of Mesozoic molybdenum depositis in East Qinling-Dabie orogenic belt, Geochimica et Cosmochimica Acta, 72, pp. 4607-4626, (2008)
  • [16] Whalen J.B., Currie K.L., Chappell B.W., A-type granites: Geochemical characteristics, discrimination and petrogenesis, Contributions to Mineralogy and Petrology, 95, pp. 407-419, (1987)
  • [17] Rajesh H.M., Characterization and origin of a compositionally zoned aluminous A-type granite from South India, Geological Magazine, 137, 3, pp. 291-318, (2000)
  • [18] Sun S.S., Mcdonough W.F., Chemical and Isotopic Systematics of Oceanic Basalts: Implications for Mantle Composition and Processes, 42, pp. 313-345, (1989)
  • [19] Collins W.J., Beams S.D., White A.J.R., Et al., Nature and origin of A-type granites with particular reference to southeastern Australia, Contributions to Mineralogy and Petrology, 80, pp. 189-200, (1982)
  • [20] Carter S.R., Evensen N.M., Hamilton P.J., Et al., Neodymium and strontium isotope evidence for crustal contamination of continental volcanics, Science, 17, pp. 743-747, (1978)
12345